The variance in snow coverage on roofs can be attributed to differences in insulation quality and roof material albedo, with well-insulated and darker roofs more likely to have less snow. Highly efficient insulation in some Northern European homes ensures warmth even when unoccupied.
Explanation:The observation that some roofs still have snow on them while others do not, despite receiving the same amount of sunlight, can be explained by differences in thermal energy and insulation. Roofs with better insulation retain heat within the home more efficiently, preventing the snow from melting as quickly. On the other hand, roofs with poor insulation allow more heat to escape, which contributes to the snow melting faster. Additionally, the albedo of the roof material could impact snow retention, with darker materials absorbing more heat and potentially melting snow quicker than lighter materials that reflect more sunlight.
In the case of Northern European homes that remain warm without heating systems, the explanation lies in highly efficient insulation that minimizes heat loss. This robust insulation keeps the internal temperature stable, even in the absence of residents to produce body heat. Thus, when the homes are unoccupied, they can still maintain warmth due to the lack of heat exchange with the colder outside environment.
Can someone please explain this to me? I need help
Answer:
The order would be: X-Rays, Visible Light, and Infrared Waves.
X-Rays have the shortest wavelength out of all three, then Visible Light, and Infrared Waves have the longest wavelength of the three.
Explanation:
So basically, the LONGER the wavelength, the lower the energy. and the SHORTER the wavelength, the higher the energy. For example, Radio waves are the WEAKEST out of all the types of waves because they have the LONGEST wavelengths. Gamma Rays are the STRONGEST out of all the types of waves because they have the SHORTEST wavelengths. So Radio Waves have the lowest energy, and Gamma Rays have the highest energy.
Here is a list of all the types of waves in order from shortest wavelength to longest wavelengths:
Gamma Rays (Shortest Wavelengths, High Energy), then X-Rays would be the second strongest, then Ultraviolet waves, then Visible Light, then Infrared waves, then Microwaves, and lastly Radio Waves (Longest Wavelengths, Low Energy).
Answer:
X rays < red visible < infrared
Explanation:
According to your picture, gamma rays have the shortest wavelength and radio waves have the longest.
Thus. the order of wavelengths is
X rays < red visible < infrared
Through which of the following ways can heat be transferred?
A.
by direct or indirect contact between objects at different temperatures
B.
only by direct contact between objects at different temperatures
C.
Heat can never be transferred between objects.
D.
only by indirect contact between objects at different temperatures
Answer:
The correct option is:
A) by direct or indirect contact between objects at different temperatures
Explanation:
Heat can be transferred in three different methods:
Conduction, Convection and Radiation
Conduction is heat transfer through direct contact between substances at different temperatures.
Convection is the heat transfer which takes place through air currents.
Radiation is the heat transfer that does not require contact between two objects.
Hence, heat transfer can take place through direct or indirect contact between objects at different temperatures.
Select the best answer for the question.
13. Which statement accurately describes the relationship between mass and weight?
A. An object with twice the mass of another object will weigh twice as much
B. An object with twice the mass of another object will weigh four times as much.
C. An object with twice the mass of another object will weigh half as much.
OD. An object with twice the mass of another object will weigh one-fourth as much.
Mark for review (Will be highlighted on the review page)
Answer: the correct option is A.
Explanation:
Weight = Mass X Acceleration due to gravity(10m/s2)
If A has a mass of 4Kg and the mass of B is twice that of A. Then their weight will be :
For A:
W = 4 x 10 = 40N
For B:
Mas of B is two times that of A i.e
2 x 4 = 8kg
W = 8 x 10 = 80N
Comparing the weight of A and B it is clear that the weight of B is also twice the weight of A
4. Which of the following is a pseudo-noble-gas electron configuration?
O A 1s22s22p3s23p%3d10
OB 1s22s22p63s23p6
OC 1s22s22p63s2305
OD 1s22s²2p63s23d10452
Final answer:
Option A represents a pseudo-noble-gas electron configuration because it has a filled d-subshell along with filled s and p subshells in the highest principal energy level, resembling noble gas stability.
Explanation:
The question 'Which of the following is a pseudo-noble-gas electron configuration?' refers to a special type of electron configuration where an atom has a filled d-subshell in addition to filled s and p subshells in its highest principal energy level, mimicking the stability of a noble gas configuration without actually having a complete octet in the valence shell.
Option A (1s22s22p63s23p63d10) is indeed a pseudo-noble-gas electron configuration because the d sublevel is completely filled along with the s and p sublevels of the third energy level. However, this type of configuration is often seen in cations of transition metals, where the atom has more d-electrons and has lost the ns electrons.
This configuration imitates the stability of a noble-gas, but does not conform to the 'octet rule', as it has 18 electrons in the outermost shell instead of 8, thus it is called a 'pseudo-noble-gas' configuration.
What was the total number of calories lost when 10 grams of water at 80c is cooled to 60c?
Answer:
Q = -200 cal
Explanation:
Given data:
Calories lost = ?
Mass of water = 10 g
Initial temperature = 80°C
Final temperature = 60°C
Solution:
Specific heat capacity of water is 1 cal/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
ΔT = 60°C- 80°C
ΔT = -20°C
Q = m.c. ΔT
Q = 10 g. 1 cal/g.°C. -20°C
Q = -200 cal
Solid crystals with _____ bonds are the best insulators. metallic covalent ionic hydrogen
Answer: covalent bond
Explanation: covalent bonded compounds do not conduct electricity. Hence, they are used as insulators
How much ice would be needed if 150,000 J is absorbed in order to melt the ice?
Answer:
449.1 g
Explanation:
The second law of thermodynamics states that heat flows from hotter objects to colder ones. Assuming that [tex]Q_1 = 150,000 J[/tex] is the heat given off by a substance in order to melt the ice, we also need to introduce the equation representing the melting of ice:
[tex]Q_2 = \Delta H^o_{fus} m_{ice}[/tex]
Since energy is conserved, the heat given off should be equal to the heat gained:
[tex]Q_1 = Q_2[/tex]
So that the equation becomes:
[tex]\Delta H^o_{fus} m_{ice} = Q_1[/tex]
The enthalpy of fusion of ice is equal to:
[tex]\Delta H^o_{fus} = 334 J/g[/tex]
From here, rearrange the equation for the mass of ice:
[tex]m_{ice} = \frac{Q_1}{\Delta H^o_{fus}} = \frac{150,000 J}{334 J/g} = 449.1 g[/tex]
Kaley is trying to determine how music affects the growth of plants. She hypothesizes that classical music will cause a plant to grow at a higher rate than no music or rap music. She grows nine tomato plants in similar lighting, temperature, and soil. Three are exposed to classical music 24 hours a day, three are exposed to rap music 24 hours a day, and three are grown in complete silence. Kaley measures the growth of the plants every day and finds that the plants all seem to have the same rate of growth. What is missing from Kaley's scientific investigation?
Answer:
As the description in the question shows, Kaley is taking careful and regular measurements. Hence, her experimental method is correct.
Kaley has also developed a hypothesis and the experiment she conducted is also valid hence there is no problem in these steps.
There is no mistake being done by her in depicting the results of the experiment.
Hence, the only thing which we can say is missing from the experiment is the past researches which scientists might have made on this topic.
Explanation:
What is the name of the part of a plant cell where water and sunlight are used ?
Answer:
Chloroplasts
Explanation:
Chloroplasts is an organelle found only in plants and eukaryotic algae that captures sunlight and converts that energy into food.
Answer:
chloroplasts
Explanation:
i searched this
What is the approximate wavelength of visible light?
(A) 7 × 10 –7 m
(B) 7 m
(C) 1 × 10 7 m
(D) 70 m
Answer:
its answer A....that's the answer is
[tex]7 \times 10 ^ - 7[/tex]
Explanation:
The visible light spectrum is the section of the electromagnetic radiation spectrum that is visible to the human eye. Essentially, that equates to the colors the human eye can see. It ranges in wavelength from approximately 400 nanometers (4 x 10 -7 m, which is violet) to 700 nm (7 x 10-7 m, which is red).
Answer: it’s A
Explanation:
Assume you have 28.0 grams of nitrogen and 5.0 grams of hydrogen what is the limiting reactant
Answer:
Hydrogen is the limiting reagent.
Explanation:
Limiting Reagent : It is the substance that get consumed when the reaction complete. It is used to determine the what amount of product will be formed.
When [tex]H_{2}[/tex] and [tex]N_{2}[/tex] react, it will produce
[tex]NH_{3}[/tex] gas . The balance reaction can be written as:\
[tex]N_{2}(g) + 3H_{2}(g) \rightarrow 2NH_{3}(g)[/tex]
Here, 1 mol [tex]N_{2}[/tex] require 3 mol [tex]H_{2}[/tex]
In question ,
[tex]moles = \frac{given\ mass}{Molar\ mass} [/tex]
Molar mass of H2 = 2 g/mol , given mass = 5 g
[tex]moles\ of\ H_{2} = \frac{5}{2}[/tex]
[tex] H_{2}[/tex] = 2.5 mole
[tex]moles\ of\ N_{2} = \frac{28}{28}[/tex]
Molar mass of N2 = 28 g/mol , given mass = 28 g
[tex] N_{2}[/tex] = 1 mole
Since, 1 mole [tex]N_{2}[/tex] require 3 mole [tex]H_{2}[/tex]
But available , mole of [tex]H_{2}[/tex] = 2.5
So we need extra 0.5 moles of Hydrogen gas
Hence [tex]H_{2}[/tex] get consumed first , Thus Hydrogen is the limiting reagent
How many liters of ammonia, measured at stp, are produced when 28.0 grams of nitrogen is completely consumed
To calculate the number of litres of ammonia produced when 28.0 grams of nitrogen is consumed, we can use stoichiometry and the ideal gas law at STP. We find that approximately 44.77 litres of ammonia are produced.
Explanation:To calculate the number of litres of ammonia produced, we need to use stoichiometry and the molar mass of nitrogen. The balanced equation for the reaction is:
N2 + 3H2 -- 2NH3
From the equation, we can see that for every 1 mole of nitrogen, 2 moles of ammonia are produced. We can use the molar mass of nitrogen to convert grams to moles:
= 28.0 g × (1 mole N₂/28.01 g)
= 0.9996 moles N₂
Since the ratio is 1:2, we can calculate the moles of ammonia produced:
0.9996 moles × (2 moles NH₃/1 mole )
= 1.9992 moles NH₃
Finally, we can use the ideal gas law to convert moles of ammonia to liters at STP:
= 1.9992 moles × (22.4 L/1 mole)
= 44.77 L
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The volume of ammonia produced from 28.0 grams of nitrogen, first convert the nitrogen mass to moles, then use the stoichiometry of the balanced equation and the ideal gas law to find that 44.8 liters of ammonia are produced.
The amount of ammonia are produced when 28.0 grams of nitrogen is completely consumed, we need to use stoichiometry and the ideal gas law. The balanced chemical equation for the formation of ammonia (NH₃) from nitrogen (N₂) and hydrogen (H₂) is: N₂(g) + 3H₂(g) → 2NH₃(g)
First, convert the mass of nitrogen (N₂) to moles: Molar mass of N₂ = 28.0 g/mol
28.0 g N₂ × (1 mol N2 / 28.0 g N₂) = 1 mol N₂
According to the balanced equation, 1 mole of N₂ produces 2 moles of NH₃.
Therefore, 1 mol N₂ will produce: 2 mol NH₃
At standard temperature and pressure (STP), 1 mole of any gas occupies 22.4 liters.
Thus: 2 mol NH₃ × 22.4 L/mol = 44.8 liters of NH₃
Therefore, 44.8 liters of ammonia are produced when 28.0 grams of nitrogen are completely consumed.
Which of the following statements is true?
Protons have negative charges.
A piece of gold is made only of gold atoms.
All molecules are compounds.
Compounds have the same properties as the elements they are made from
Answer:
Below.
Explanation:
True:
A piece of gold is made only of gold atoms.
Untrue:
Protons have negative charges ( they are positive).
All molecules are compounds . (Oxygen gas O2 is a molecule but not a compound as the 2 atoms are the same).
Compounds have the same properties as the elements they are made from.
In the reaction N2 + 3H2 → 2NH3, what is the mole ratio of hydrogen to nitrogen?
Answer: The mole ratio of hydrogen to nitrogen is 3 mole: 1 mole, 3:1
Explanation:
•Mole ratios are determined using the coefficients of the substances in the balanced chemical equation. •Each coefficient represents the number of mole of each substance in the chemical reaction.
•The mole ratio can be determined by first writing out a balanced chemical equation for the reaction.
For this reaction the balanced chemical equation is
N2(g) + 3H2(g) ----> 2NH3(g)
1mol:3mol : 2mol
From the equation we can see that 1 mole of N2(g) reacts with 3 moles of H2(g) or 3 moles of H2(g) react with 1 mole of N2(g) to produce 2 moles of NH3(g).
Therefore, the mole ratio of hydrogen to nitrogen is 3 mole: 1 mole, 3:1
The mole ratio of hydrogen to nitrogen is. 3:1
In the balanced chemical equation [tex]\( \text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3 \),[/tex] the coefficients represent the stoichiometric amounts of each substance involved in the reaction. The coefficient of [tex]\( \text{N}_2 \)[/tex] is 1, indicating that 1 mole of nitrogen reacts. The coefficient of [tex]\( \text{H}_2 \)[/tex] is 3, indicating that 3 moles of hydrogen react.
To determine the mole ratio of hydrogen to nitrogen, we compare these coefficients directly. The mole ratio of hydrogen x[tex]\( \text{H}_2 \)[/tex] to nitrogen [tex](\( \text{N}_2 \))[/tex] in the reaction [tex]\( \text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3 \)[/tex] is [tex]\( \frac{3 \text{ moles H}_2}{1 \text{ mole N}_2} \)[/tex], simplifying to [tex]\( \\3:1} \).[/tex]This ratio shows that for every 1 mole of nitrogen consumed, 3 moles of hydrogen are required according to the stoichiometry of the reacti
.
16. What is the percent composition of a compound that contains 36.03 g of C and 8.06 of H
Answer:
The percentage composition of the compound is 81.72% of C and 18.28% of H.
Explanation: Percentage composition is the percentage by mass of each element in a compound. It is the ratio of an amount of each element to the total amount of individual elements in a compound, which is then multiplied with 100.
Since the compound above contains only carbon and hydrogen, we will have to find the sum of their masses.
Given 36.03g of Carbon and 8.06g of hydrogen,
36.03g + 8.06g = 44.09g of the compound
%composition= gram of element/gram of compound × 100
%C = 36.03/44.09 × 100
%C= 0.8172 × 100
℅C= 81.72%
Likewise for H
%H= 8.06/44.09 × 100
%H= 0.1828 × 100
%H= 18.28%
Therefore, the compound can be said to contain 81.72% of C and 18.28% of H
I NEED HELP! IDK IF IT’S C or D?????
Answer:
option D : when ΔH is positive and ΔS isnegative
Explanation:
The answer will be explained by the following equation for the gibbs free energy
G = H - TS
Where
G = gibbs free energy
H = enthalpy of a system (heat
T = temperature
S = entropy
So the change in the gibbs free energy at constant temperature can be written as
ΔG = ΔH - TΔS . . . . . . (1)
Where
ΔG = Change in gibbs free energy
ΔH = Change in enthalpy of a system
ΔS = Change in entropy
During a spontaneous reaction the energy given in the form of heat that is ΔH or spontaneous due to disorder of the system that is ΔS are the driving forces of gibbs free energy.
Gibbs free energy is a state function and the change in gibbs free energy is equal to the change in enthalpy minus product of temperature and change in entropy as shown in equation 1
ΔG = ΔH - TΔS . . . . . . (1)
From the above equation it is obvious that ΔG will be positive for any reaction for which ΔH is positive and ΔS is negative. when ΔG is positive the reaction will be non spontaneous and unfavorable.
So,
option D is correct: when ΔH is positive and ΔS is negative
13. During photosynthesis, carbon dioxide and water combine according to the general
equation:
Energy
Carbon Dioxide + Water Sugar + Oxygen
Why is photosynthesis a chemical reaction?
A because new substances are formed
B. because an input of energy is required
C. because the reactants are compounds
D. because the products include an element
Cray, metallic zinc filings were added to a heaker of dilute hydrochloric acid in a fume hond.
Answer:
C bc it is
Explanation:
C IS GOOD ANSWER
The photosynthesis is a chemical reaction because the reactants are compounds. Hence option C is correct.
What is chemical reaction?Chemical reaction is defined as a procedure that results in the chemical conversion of one group of chemicals into another. Reactants are substances that are present at the beginning of a chemical reaction. A substance that remains after a chemical reaction is complete is known as a product.
Photosynthesis is defined as the method used by plants, algae, and some microorganisms to produce sugar and oxygen from sunlight, carbon dioxide, and water. It is a process that only happens in plants that contain the chlorophyll, a green pigment used in food preparation. Photosynthesis is primarily used to convert solar energy into chemical energy, which is then stored for use at a later time.
Thus, the photosynthesis is a chemical reaction because the reactants are compounds. Hence option C is correct.
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Why do some chemical reactions occur?
Answer:
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products
Chemical reactions occur when atoms in reactants form new products, leading to changes in energy and entropy. Factors like temperature, concentration, and the use of catalysts influence the rate and spontaneity of reactions.
Chemical reactions transpire when atoms in the reactants rearrange their chemical bonds to form products. This rearrangement leads to a change in total energy, as the new bonds have different energy levels compared to the original bonds in the reactants. There are several reasons and conditions under which chemical reactions occur:
Energy Changes: All chemical reactions involve changes in energy. Reactions may either absorb energy (endothermic) or release energy (exothermic), and these energy changes can be a driving force for the reaction to occur.Entropy: Another driving force for chemical reactions is entropy, which is essentially the measure of disorder within a system. Reactions may occur to increase entropy.Reaction Rates: Conditions like temperature, concentration of reactants, and the presence of catalysts can affect the rate at which reactions occur. Higher temperatures and concentrations generally increase reaction rates, while catalysts lower the activation energy needed for the reaction to take place.Spontaneity and Activation Energy: Some reactions occur spontaneously due to favorable energy and entropy conditions while others require the input of energy to overcome an energy barrier known as activation energy.In summary, chemical reactions occur due to the reorganization of atoms to form more stable or favorable products, driven by changes in energy and entropy and influenced by various factors that affect reaction rates.
convert 0.0155 kg to mg
Answer:
15500
Explanation:
1 kg = 1000000
so, 0.0155 kg × 1000000
To convert 0.0155 kilograms to milligrams, we multiply by 1,000,000, giving us 15500 milligrams.
Explanation:
To convert kilograms (kg) to milligrams (mg), we need to know the relationship between these units. There are 1,000,000 milligrams in a kilogram, so you can convert kg to mg by multiplying the number of kilograms by 1,000,000.
In your particular case, you want to convert 0.0155 kg to mg. So, you would perform the following operation:
0.0155 kg * 1,000,000 = 15500 mg
So, 0.0155 kg is equivalent to 15500 mg.
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How is thermal energy transferred from Earth's core?
Through the absorption of water heated by the sun
Through convection that takes place in the atmosphere
Through conduction from magma to water and rocks
Through the sun's radiation that heats the ground
Answer:
Through conduction from magma to water and rocks
Explanation:
The core of the Earth is extremely hot, just about 10,800 °F or 6,000 °C. The heat from the core is then transferred to the magma, which heats up the rocks and water through convection. When the magma is heated up, it tends to rise and it heats up the water deep in the ocean and the rocks in the lithosphere. The water also brings in the warmth through convection.
Note: The other choices also show how thermal energy is transferred from the sun and not the Earth's core.
Answer: it's c, give the other person brainliest for that highly coveted crown
Explanation:
Which element would have properties characteristic of both a metal and a nonmetal
Answer:
Examples: Si, B, Ge, Sb, Ga
Explanation:
The majority of elements in the periodic table are classified as either a metal (a species that can lose electrons to become a cation) or a non-metal (a species that can gain electrons to become an anion).
However, there are several atoms which are considered to be metalloids. Metalloids are elements which possess properties that resemble both metals and non-metals. Examples of metalloids would be: silicon (Si), boron (B), germanium (Ge), antimony (Sb), gallium (Ga).
Since metalloids have properties of both metals and non-metals, they are widely used in semiconductors, as they might both donate and accept electrons in their shells.
A metalloid is an element that exhibits properties characteristic of both metals and nonmetals. Examples include boron, silicon, and germanium. They are often semiconductors, exhibiting physical properties of metals and chemical properties of nonmetals.
Explanation:A metalloid is an element that possesses properties characteristic of both metals and nonmetals. This group includes elements like boron, silicon, and germanium, among others. Metalloids are often semiconductors, meaning they conduct heat and electricity better than nonmetals but not as well as metals. Some exhibit specific physical properties of metals, like being shiny and malleable, while concurrently displaying chemical properties of nonmetals, such as being bad conductors of heat and electricity in their pure forms.
For example, boron (from Group 13 of the periodic table) is a metalloid. While it tends to form covalent bonds like nonmetals, it also exhibits semiconducting properties. Additionally, the oxides and hydroxides of certain members of Group 13 (like aluminum and gallium) can exhibit both acidic and basic behaviors, which is characteristic of both nonmetals and metals.
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What is the oxidation state of S in so ??
Answer:
+2
Explanation:
If a compound [tex]SO[/tex] existed, we would identify the oxidation state of sulfur using the following logic:
oxygen is more electronegative than sulfur, so it's more electron-withdrawing and it should have a negative oxidation state producing a positive oxidation state for sulfur;oxygen typically has an oxidation state of -2;we may then apply the fact that SO is expected to be a molecule with a net charge of 0;if the net charge is 0 and the oxidation state of oxygen is -2, we may set the oxidation state of S to x;write the equation for the net charge of 0 by adding all individual charges of the two atoms: [tex]x + (-2) = 0[/tex];hence, x = 2.That said, in this hypothetical compound S would have an oxidation state of +2.
HELP! Can two different species occupy the same niche at the same time? Why or why not?
A. Yes, but they would eventually evolve into one species.
B. No, they would compete for all necessary resources.
C. Yes, as there are always some small differences.
D. No, as they will both go extinct.
Answer:
The correct option is B ) No, they would compete for all necessary resources.
Explanation:
In ecology, a niche can be described as the role that an organism plays in a community or ecosystem. The niche of a species describes what food a particular organism eats, the place it lives, the place it reproduces and the relationship it has with other organisms of the community.
If two species belong to the same niche at a time, then they will fight for resources between them. As a result, one of the species will have to move from the place. One of the species might become get killed due to competition. Hence, two different species cannot belong to the same niche at a time.
80cm^3 of oxygen gas diffussed through a porous holebin 50 seconds how long will it take 120cm^3 of nitrogen (iv) oxide to diffuse through thr same hole under the same confitions
Answer:
time for NO₂ to diffuse = 90 s
Explanation:
Data Given:
Amount of O₂ gas transferred = 80 cm³
time of O₂ gas to diffuse = 50s
Amount of NO₂ gas transferred = 120 cm³
time of NO₂ gas to diffuse = ?
Solution:
As we know
rate of diffusion = Amount of gas transferred / time . . . . . . . (1)
we also know that Graham's Law is
rate of diffusion gas A/rate of diffusion gas B = [tex]\sqrt{mB/mA}[/tex] . . . (2)
where
mA = molar mass of gas A
mB = molar mass of gas B
combine both equation 1 and 2
(Amount of gas A transferred / time for gas A) / (Amount of gas B transferred / time for gas B) = [tex]\sqrt{mB/mA}[/tex] . . . . . . . . (3)
we can write equation 3 for oxygen and nitrogen (iv) oxide
(Amount of gas O₂ transferred / time for gas O₂) / (Amount of gas NO₂ transferred / time for gas NO₂) = [tex]\sqrt{m NO₂/mO₂}[/tex] . . . . . . . (4)
molar mass of O₂ = 2 (16) = 32 g/molmolar mass of NO₂ = 14 + 2(16) = 46 g/molPut values in equation equation 4
(80 cm³/50 s) / (120 cm³ / time for NO₂) = [tex]\sqrt{46 g/mol/32 g/mol}[/tex]
(1.6 cm³/s)/(120 cm³ / time for NO₂) = [tex]\sqrt{1.44}[/tex]
(1.6 cm³/s) / (120 cm³ / time for NO₂) = 1.2
Rearrange the above equation
time for NO₂ = 1.2 /(1.6 cm³/s) x 120 cm³
time for NO₂ = 90 s
So,
time for NO₂ to diffuse = 90 s
9.(02.02 MC)
Ben wrote the following examples of changes in substances.
Example A: Vegetables are chopped.
Example B: Food is broken up into simpler form during digestion.
Which statement is correct? (1 point)
Both are examples of physical changes
Both are examples of chemical changes
Example A describes a physical change and Example B describes a chemical change.
Example A describes a chemical change and Example B describes a physical change
Answer:
Example A describes a physical change and Example B describes a chemical change.
Explanation:
Physical Change
The changes that occur only due to change in shape or physical properties but their chemical or internal composition remain unchanged.
These changes were reversible.
They have same chemical property.
These changes can be observed with naked eye.
Example :
Vegetables are chopped and converted into smaller pieces the composition remain same. It is physical change.
Water converting to Ice
Water converting to gas
In this water molecule remain the same only they rearrange themselves that change its state of mater not composition
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
These changes are irreversible
These changes occur due to chemical reactions
These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg .
Food is broken up into simpler form during digestion and convert into the energy and particles which are different from original compound .
Answer:
Example A describes a physical change and Example B describes a chemical change.
Explanation:
PLEASE HELP.
A charged particle in an accelerated motion produces EM radiation.
In an atom the electrons have accelerated motion.Does it means that all electrons in atoms produce EM wave???
Answer:
Yes. all the accelerating charged electron particles produces the Electromagnetic wave.
Explanation:
Magnetic fields are produced during the movement of the charged particle. the magnetic field produced, will exert some force in the moving charges. The electric field as well as the magnetic field travelling in the empty space with respect of speed of light are the electromagnetic wave. Moving electron will always produce the magnetic field and thus the electrons motion are constant,but when the acceleration starts the electromagnetic waves are being radiated.
C2H4O2 + NaC2H3O2 + H2O + CO2 list the reactants in this chemical reaction
Answer:
C₂H₄O₂ and NaC₂H₃O₂ are reactants.
Explanation:
Word equation:
Acetic acid + sodium acetate → sodium diacetate
Chemical equation:
C₂H₄O₂ + NaC₂H₃O₂ → C₄H₇NaO₄
This is a synthesis reaction in which simple reactants combine to form complex product.
This is also balanced chemical equation because there are equal number of atoms of all elements on both side of equation. Thus it follow the law of conservation of mass.
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
what is -6+2x=-10 I need to no
Answer:
x=-8
Explanation:
First you move the -6 over to the -10 (which makes the -6 a 6)
Then you solve -10+6=-4
Then do -4 times 2 which equals 8
HOPE THIS HELPS
Determine the pH of 0.050 M HCN solution. HCN is a weak acid with a Ka equal to 4.9 x 10-10
DONE
Answer:
5.3
The next one is 11
Explanation:
To determine the pH of a 0.050 M HCN solution, we can use the given Ka value and the equilibrium expression for the acid dissociation reaction. By assuming that the concentration of H+ ions and CN- ions will be equal, we can solve for the concentration of H+ ions and calculate the pH.
Explanation:To determine the pH of a 0.050 M HCN solution, we need to use the given Ka value and the equilibrium expression for the acid dissociation reaction:
HCN(aq) ↔ H+(aq) + CN-(aq)
The equilibrium constant expression is Ka = [H+][CN-]/[HCN]. Since the initial concentration of HCN is given as 0.050 M, we can assume that the change in concentration of HCN will be small when it dissociates. Therefore, we can neglect x in the denominator and write the equilibrium expression as Ka = [H+][CN-].
Given that Ka = 4.9 x 10-10, we can assume that the concentration of H+ ions and CN- ions will be equal since HCN is a weak acid and does not dissociate completely. Therefore, [H+] = [CN-].
Let x be the concentration of H+ and CN- ions. Then, according to the equilibrium expression, [H+] = x and [CN-] = x.
Substituting these values into the equilibrium expression, we have:
4.9 x 10-10 = (x)(x)
Solving for x gives x = 7.0 x 10-6 M. Since [H+] = x, the pH of the solution is equal to the negative logarithm of x:
pH = -log(7.0 x 10-6) ≈ 5.16
Explain how Earth is heated through radiation.
Heat from the Earth's core and radiation from the Sun is transferred to the surface of the Earth by conduction. Contact of the atmosphere with these warm surfaces transfers thermal energy, which then heats up the rest of the air through convection
Earth is heated through radiation, which involves the absorption of solar energy by the Earth's surface and its re-emission as infrared radiation. Greenhouse gases in the atmosphere trap some of this infrared radiation, keeping the Earth warm.
How Earth is Heated through Radiation:
The Earth is primarily heated through the process of radiation, which is the transfer of energy in the form of electromagnetic waves. This energy comes from the Sun, which emits solar radiation due to nuclear fusion reactions occurring in its core. As this solar radiation travels through space, it reaches Earth where it is absorbed by the surface, warming it. The Earth's surface then re-radiates this energy as infrared radiation, a form of thermal energy.
While some of the infrared radiation escapes into space, a significant portion is trapped by greenhouse gases such as water vapor, carbon dioxide, and methane present in the Earth' surfaces.
Earth maintains a balance of temperature by radiating back into space an equivalent amount of energy that it receives from the sun. However, this balance can be affected by the concentration of greenhouse gases, which can enhance the warming effect and cause climate change.