Answer:
Positive effect - allow the search and development of environmental friendly sources, to decrease the risk of polluents in the ozone (in the world).
Negative effect - environmental imbalances like: toxic gas leaks, river and soil contamination, etc.
Explanation:
Ozone (O3) is one of the gases that make up the atmosphere and about 90% of its molecules are concentrated between 20 and 35 km altitude, called the Ozone Layer. Its importance is that it is the only gas that filters out type B ultraviolet radiation (UV-B), which is harmful to living beings.
Ozone has different functions in the atmosphere depending on its altitude. In the stratosphere, ozone is created when solar ultraviolet radiation interacts with the oxygen molecule, breaking it into two oxygen atoms (O). The released oxygen atom attaches itself to an oxygen molecule (O2), thus forming ozone (O3). In the stratospheric region, 90% of type B ultraviolet radiation is absorbed by ozone. At ground level in the troposphere, ozone loses its protective function and becomes a polluting gas, responsible for increasing surface temperature, together with carbon monoxide (CO), carbon dioxide (CO2), methane (CH4) and nitrous oxide.
Several chemicals are destroying ozone. By reacting with it, the nitric and nitrous oxides expelled from vehicles and the CO2 produced by burning fossil fuels such as coal and oil are destroying the protective layer of the planet, opening holes in it.
To reduce gas emissions, chemical professionals have been studying in depth the substitution of fossil energy, which generates a lot of pollution, by the so-called renewable energy. Other example can be the electric car, which is environmentally friendly because it does not emit polluting gases, is already a reality, sold in many countries. So, this a positive effect of chemistry nowadays, which it can allow the search for environmental friendly sources, to decrease the risk of polluents.
But associated with progress, we have a multitude of environmental imbalances. Toxic gas leaks, river and soil contamination and poisoning by ingestion of contaminated food are problems shown daily - these could be some negative effects of chemistry nowadays.
Answer:
The benefits of CFCs include their use as coolants.
CFCs can be used as foaming agents and fire extinguishers.
CFCs, when released into the atmosphere, destroy ozone in the stratosphere.
CFCs destroy ozone in the stratosphere, which is the chemical layer that shields living things from too much ultraviolet radiation from the sun.
beryllium be and chlorine cl form a binary ionic compound with a one to two ratio of beryllium ions to chloride ions. the formular for the compound is?
Answer: BeCl2
Explanation:
Be + Cl2 —> BeCl2
Answer:BeCl2
Explanation:
Reaction between Beryllium (Be) a di-ionic cation and Chlorine a mono-ionic forms BeCl2.
What is the percent composition by mass of nitrogen in the compound N2H4 (gram-formula mass = 32 g/mol)?
The percentage composition of the nitrogen in N₂H₄ is 87.5%
The percentage composition of an element in a compound can be obtained by using the following formula:
Percentage = [tex]\frac{mass of element }{mass of compound }[/tex] × 100
With the above formula, we can obtain the percentage composition by mass of nitrogen in N₂H₄ as illustrated below:
Molar mass of N₂H₄ = 32 g/mol
Mass of N in N₂H₄ = 2N = 2 × 14 = 28 g/mol
Percentage composition of Nitrogen =?Percentage = [tex]\frac{mass of element }{mass of compound }[/tex] × 100
Percentage of nitrogen = [tex]\frac{28}{32}[/tex] × 100
Percentage of nitrogen = 0.875 × 100
Percentage of nitrogen = 87.5%Therefore, the percentage composition of the nitrogen in N₂H₄ is 87.5%
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The percent composition by mass of nitrogen in N2H4 is 87.56%.
Explanation:To find the percent composition by mass of nitrogen in N2H4, we must perform the following calculations:
First, calculate the molar mass of the compound. For N2H4, this is 32 g/mol as given.Next, calculate the total mass of nitrogen in one mole of the compound. Nitrogen has an atomic mass of approximately 14.01 g/mol. Since there are two nitrogen atoms in N2H4, the total mass of nitrogen is 2 * 14.01 g/mol = 28.02 g/mol.To find the percent composition of nitrogen, divide the mass of nitrogen in the compound by the molar mass of the compound and multiply by 100:(28.02 g N / 32 g N2H4) × 100 = 87.56%
Therefore, the percent composition of nitrogen in N2H4 is 87.56%.
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are alcohols with more than one hydroxyl group attached to a carbon sequence.
Polyhydroxyl alcohols
Molyhydroxyl alcohols
Hydroxyl alcohols
Hydroxide alcohols
Answer:
Polyhydroxyl alcohols
Explanation:
Whenever we have several C-OH bonds, we have a polyhydroxyl alcohol. For example, if we have just one alcohol group, that is, an R-OH group, then the naming is simple, say, we have EtOH, it's ethanol.
The problem becomes more complicated when we have several hydroxyl groups present in the alcohol. Let's say we have an ethane molecule and we replace the hydrogen atoms of carbon 1 and 2 with hydroxyl groups. In that case, we have 1,2-ethanediol. Similarly, we can have triols etc.
That said, we have poly (several) hydroxyl groups and we can generalize this to having polyhydroxyl alcohols.
Answer:
Explanation:
Polyhydroxyl alcohols
describe in your own words a person of charles law
Answer: the graph of Charles' law is a graph that passes through the origin in which as one variable increases, the other also increases and vice versa.
Explanation:
An atom of an element with atomic number 48 in mass number 120 contains how many electrons
Answer:
48
Explanation:
So all we have to consider here is the atomic number. Remember that in a neutral atom the amount of electrons = the amount of protons.
Also that the atomic number = the number of protons.
So we can say that in an atom with atomic number 48, there are 48 protons and therefore 48 electrons.
An atom of an element with an atomic number of 48 and mass number of 120 contains 48 electrons, indicating that it is a neutral atom. The number of neutrons can be determined by subtracting the atomic number from the mass number, which in this case, gives 72 neutrons.
Explanation:The atomic number of an element 48 in this case, defines the number of protons in its nucleus and also, in a neutral atom, the number of electrons. Therefore, an atom of an element with an atomic number of 48 contains 48 electrons. The mass number (120) is the sum of the number of protons and neutrons in the atom's nucleus. To find the number of neutrons, we subtract the atomic number from the mass number (120-48), which gives us 72 neutrons.
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Can you someone do my chem homework. I will pay $$$. I attached a question
Answer:
Acid-Base
Combustion
Combination
Decomposition
Explanation:
(1) KOH is acid and HBrO is a base which reacts to form water , thus it is an example of acid-base reaction.
(2) In the reactants Oxygen gas is used , whenever Oxygen comes in a reaction it is an example of Combustion reaction as the other reactant starts burning.
(3) Here two reactant combines to produce a single product , thus it is an example of Combustion Reaction.
(4) Here A single reactant decomposes to form two products in this reaction , thus it is an example of Decomposition Reaction.
Not sure....HELP!!!!!!!
How many molecules are in 6.38g of H2O?
Answer:
x = 2.2*10^23 molecules of H2O
Explanation:
H = 1g
O = 16g
H2O = 1g*2 + 16g
H2O = 18g = 1 mol of H2O
18 g___1 mol of H2O
6.38g__ x = 0.354 mol of H2O
1 mol______6.22*10^23 molecules
0.354 mol__x = 2.2*10^23 molecules of H2O
Scientists have observed huge bubbles of gas ejecting from the sun. Which of these events would most likely occur due to this solar condition? (2 points) Question 2 options: 1) decrease in wind velocity 2) decrease in the gravitational force 3) increase in the average temperature of Earth 4) increase in the amount of helium in the atmosphere
Answer:
3) increase in the average temperature of Earth
Explanation:
Coronal mass ejections or CME is the phenomena described as "Scientists have observed huge bubbles of gas ejecting from the sun". Whilst CMEs can happen alongside solar flares, it is also important to know that they can occur by themselves (independently). Solar flares refers to the abrupt release of energy kept in twisted magnetic fields caused by explosions on the Sun.
When these solar flares hit the earth, the gases (gas molecules) in the upper atmosphere such as nitrogen and water vapor are broken up and freed. This new gases then react with molecules in the ozone layer and reduce its layer. Consequently, the result is that there is increase in the average temperature of Earth.
Hence, option 3 is the event most likely to occur due to this solar condition
Answer:
C. increase in the average temperature of Earth
Explanation:
in a labratory activity the density of a sample of vanadium is determined to be 6.9g/cm^3 at room temperature. what is the percent error for the determined value?
answers:
a : 0.15%
b : 0.87%
c : 13%
d : 15%
PLEASE EXPLAIN! please
Answer:
c : 13%
Explanation:
Data Give:
Experimental density of vanadium = 6.9 g/cm³
percent error = ?
Solution:
Formula used to calculate % error
% error = [experimental value -accepted value/accepted value] x 100
The reported accepted density value for vanadium = 6.11 g/cm³
Put value in the above equation
% error = [ 6.9 - 6.11 / 6.11 ] x 100
% error = [ 0.79 / 6.11 ] x 100
% error = [ 0.129] x 100
% error = 12.9
Round to the 2 significant figure
% error = 13 %
So, option c is correct
which element belongs to the P^6 -block of the periodic table
Answer:
The P6 block of the periodic table is the block that belong to the noble gases. The noble gases in P6 block are: Helium, neon, argon, krypton, xenon and radon
Explanation:
P-block elements in periodic table is non-metals. The elements which belongs to p⁶ block are noble gases, i.e., helium, neon, argon, krypton, xenon and radon.
What are noble gases?Nobel gases are inert gases having completely filled orbitals. Hence they are normally unreactive. Noble gases are non-metals and exists in gaseous state.
Noble gases are termed as p⁶ elements because, their valence p orbital is completely filled by 6 electrons. Therefore the noble gases helium, neon, argon, krypton, xenon and radon are termed as p⁶ block elements.
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Suppose 0.09886 M KOH is titrated into 15.00 mL H2SO4 of unknown concentration until the equivalence point is reached. It takes a total volume of 29.25 mL KOH to neutralize the H2SO4.
What is the concentration of the acid? Express the result to the proper number of significant figures based on the limits of data from the problem.
M acid
Answer:
0.09639M
Explanation:
Step 1:
The balanced equation for the reaction. This is given below:
H2SO4 + 2KOH —> K2SO4 + 2H2
The following were obtained from the balanced equation
Mole of the acid (nA) = 1
Mole of the base (nB) = 2
Step 2:
Data obtained from the question. This includes:
Concentration of acid (Ca) =?
Volume of acid (Va) = 15mL
Concentration of base (Cb) = 0.09886M
Volume of base (Vb) = 29.25mL
Step 3:
Determination of the concentration of the acid.
Applying the equation:
CaVa/CbVb = nA/nB
The concentration of the acid can be obtained as follow:
CaVa/CbVb = nA/nB
Ca x 15 / 0.09886 x 29.25 = 1/2
Cross multiply to express in linear form
Ca x 15 x 2 = 0.09886 x 29.25 x 1
Divide both side by 15 x 2
Ca = (0.09886 x 29.25) / (15 x 2)
Ca = 0.09639M
Therefore, the concentration of the acid is 0.09639M
Answer:
0.09639 M acid
Explanation:
why do magnesium and oxygen combine?
Answer:
Becuse magnesium is a earth alkaline metal and oxygen is a nonmetal(read explanation)
Explanation:
Magnesium has 2 valence electrons where oxygen has 6 valence electrons. Magnesium has tendency to give electrons to oxygen and oxygen has tendency to gain electrons. They are both trying to complete their last shell to 8 which is called the octet rule. Because they both want to complete each other because of the reasons that I told they combine to be stanle atoms like noble gases.
A 360. mg sample of aspirin, C9H8O4, (molar mass 180. g), is dissolved in enough water to produce 200. mL of solution. What is the molarity of aspirin in a 50. mL sample of this solution?
Answer:
Molarity = 0.01 M
Explanation:
Molarity is used to measure the concentration of a solution. It will be same for the whole solution or a small amount of solution if the solution is homogeneous.
So, Molarity of 200 mL of solution = Molarity of 50 mL of solution
[tex]\mathbf{Molarity = \frac{number \ of \ moles \ of \ solute}{Volume \ of \ solution \ (in \ liters)}}[/tex]
[tex]\mathbf{Moles = \frac{given \ mass \ of \ compound}{molar \ mass \ of \ compound}}[/tex]
given mass of aspirin = 360 mg = 0.36 g
molar mass of aspirin = 180 g
Volume of solution = 200 mL = 0.2 L
[tex]\mathrm{Mole \ of \ Aspirin = \frac{0.36}{180} = \mathbf{0.002 \ moles}}[/tex]
[tex]\mathrm{Molarity = \frac{0.002}{0.2} = \mathbf{0.01 \ M}}[/tex]
Therefore, Molarity = 0.01 M
50. mL of a sample prepared by dissolving 360. mg of aspirin in 200. mL of solution, has a molarity of 0.0100 M.
First, we will convert 360. mg (0.360 g) to moles of aspirin using its molar mass (180. g/mol).
[tex]0.360 g \times \frac{1mol}{180. g} = 2.00 \times 10^{-3} mol[/tex]
2.00 × 10⁻³ moles of aspirin are dissolved in 200. mL (0.200 L) of solution. The molarity of the solution is:
[tex]M = \frac{2.00 \times 10^{-3} mol}{0.200 L} = 0.0100 M[/tex]
The molarity is an intrinsic property, so a 50. mL sample will have the same molarity as the 200. mL solution.
50. mL of a sample prepared by dissolving 360. mg of aspirin in 200. mL of solution, has a molarity of 0.0100 M.
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4. What is one important assumption about the properties
ht assumption about the properties of an ideal gas under the kinetic-
molecular theory of gases?
a) All ideal gases have the same molar mass or molecular weight
b) Ideal gases all have the same partial pressure in a mixture of gases
c) The collision of ideal gas molecules is assumed to be perfectly elastic
d) Ideal gas properties have no effect on the behavior of ideal gases
5. Convert 34 degrees Celsius to temperature expressed as Kelvin.
a) -239. Kelvin
b) 134 Kelvin
c) 93.2 Kelvin
d) 307 Kelvin
4)
Under the kinetic-molecular theory of gases, one important assumption about the properties of an ideal gas is that the collision between gas molecules is perfectly elastic. This means that during collisions, there is no net loss or gain of kinetic energy. The gas molecules simply exchange energy, changing direction and speed, but the total energy of the system remains constant.
This assumption is crucial in understanding the behavior of ideal gases because it helps explain various gas properties, such as the relationship between pressure, volume, and temperature. The perfectly elastic collisions allow the gas molecules to freely move and exert pressure on the walls of the container.
5)
To convert degrees Celsius to Kelvin, you simply add 273.15 to the temperature in Celsius.
In this case, to convert 34 degrees Celsius to Kelvin, you would add 273.15:
34 degrees Celsius + 273.15 = 307.15 Kelvin
Therefore, the temperature expressed as Kelvin is 307 Kelvin.
In the final chemical equation, HF and O2 are the products that are formed through the reaction between H2O and F2. Before you can add these intermediate chemical equations, you need to alter them by multiplying the
A.second equation by 2 and reversing the first equation.
B.first equation by 2 and reversing it.
C.first equation by (1/2) and reversing the second equation.
D.second equation by 2 and reversing it.
Answer:
Option A: Second equation by 2 and reversing the first equation
Explanation:
In order for the equation to become balanced by elements, dividing the second equation by 2 and then reversing the first equation to simplify the equation correctly is how you can then add the intermediate chemical equations. Took the test on edg and it was correct :)
In the final chemical equation, HF and O₂ are the products that are formed through the reaction between H₂O and F₂. Before you can add these intermediate chemical equations, you need to alter them by multiplying the second equation by 2 and reversing it and the correct option is option D.
What is a Chemical Equation?A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side
They provide brief information about the amount of chemicals participating in a reaction.
In the given reaction,
Multiplying the second equation by 2 gives -
2H₂ + 2F₂ = 4HF
And then reversing it and adding to the first one gives -
4HF = 2H₂ + 2F₂
2H₂ + O₂ = 2H₂O
The hydrogens on both the sides cancel out and we are left with
4HF + O₂ = 2H₂O + 2F₂
Therefore, In the final chemical equation, HF and O₂ are the products that are formed through the reaction between H₂O and F₂. Before you can add these intermediate chemical equations, you need to alter them by multiplying the second equation by 2 and reversing it and the correct option is option D.
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PLEASE HELP!!
1.)
What would be the effect on the nucleus of an atom if it emitted one alpha particle and one gamma ray?
a decrease of two in atomic number and a decrease of four in mass number
an increase of one in atomic number and a decrease of two in mass number
an increase of one in atomic number and an increase of two in mass number
an increase of two in atomic number and an increase of four in mass number
2.)
When is nuclear decay by beta particle emission more common in atoms?
have an atomic number greater than 83
have a high proton to neutron ratio
have a high neutron to proton ratio
have a low proton to neutron ratio
3.)
If an atom of polonium-218 were to undergo positron emission, which nuclide would result?
bismuth-218
bismuth-217
astatine-218
astatine-217
4.)
A certain chemical reaction experiences a 7.50 × 10-7 kilogram loss in mass. If this mass were to be totally converted to energy, what would be the magnitude of that energy? (1 J = 1 )
1.20 × 1023 J
2.5 × 109 J
4.00 × 101 J
6.75 × 1010 J
Answer: (a)
Decrease of two in atomic number and a decrease of four in mass number
Explanation:
The effect on the nucleus of an atom if it emitted one alpha particle and one gamma ray is:
Alpha (α) particles are like He+2 nucleus which has 2 protons and 2 neutrons. Thus after emitting α particles there will be decrease of atomic number by 2 and mass number will be decreased by 4. And the emission of gamma ray does not produce effect on the number of protons and neutrons.
• Which is temperature most directly
related to?
A. kinetic energy
B. mechanical energy
C. potential energy
D. thermal energy
Among the following, temperature is most directly related to the thermal energy. It is the energy acquired by body by the absorption of heat.
What is thermal energy?Thermal energy is a form of energy acquired by increasing the temperature of a body. Thermal energy of a body is directly proportional to the temperature of the body.
Kinetic energy is generated by virtue of motion of a body. Thus only a moving body will gain kinetic energy. For a moving body, as thermal energy increases, kinetic energy also increases.
Potential energy is generated by virtue of the position of an object which is in a height from the surface. The kinetic energy and potential energy together called as mechanical energy. They are related with the temperature.
However, the temperature is most directly related to thermal energy. Thus option D is correct.
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1. (NH)2CrO-
a) Number of moles of H:
b) Number of moles of N:
2. Ag.SO.
a) Molar Mass:
b) Percent Composition of Ag:
c) Percent Composition of S:
d) Percent Composition of O:
Question:
1. (NH)2CrO
a) Number of moles of H:
b) Number of moles of N:
Answer:
a) Number of moles of H: 2
b) Number of moles of N: 2
Explanation:
The [tex](NH)_2CrO[/tex] is ammonium Chromate which is monoclinic and yellow Crystal that is formed due to the reaction of ammonium Hydroxide and ammonium di-chromate. It is used as catalyst, corrosion inhibitor as well as analytical inhibitors.
Question:
2. Ag.SO.
a) Molar Mass:
b) Percent Composition of Ag:
c) Percent Composition of S:
d) Percent Composition of O:
Answer:
a) Molar Mass: 155.93 Kg
b) Percent Composition of Ag: 69%
c) Percent Composition of S: 20.5%
d) Percent Composition of O: 10.2%
Explanation:
Molar mass = molar mass of Ag + molar mass of S + molar mass of O
=>107.87+32.06+16
=> 155.93 Kg
Percent Composition of Ag
= [tex]\frac{ \text{mass due to Ag}}{\text {total molar mass}} \times 100[/tex]
= [tex]\frac{107.87}{155.93} \times 100[/tex]
= 0.69 \times 100
= 69%
Percent Composition of S:
= [tex]\frac{ \text{mass due to S}}{\text {total molar mass}} \times 100[/tex]
=[tex]\frac{32.06}{155.93} \times 100[/tex]
= 0.205 \times 100
= 20.5%
Percent Composition of O:
= [tex]\frac{ \text{mass due to O}}{\text {total molar mass}} \times 100[/tex]
= [tex]\frac{16.00}{155.93} \times 100[/tex]
= 0.102 \times 100
= 10.2%
Which geological features MOST LIKELY prompted the development of the theory of plate tectonics?
A) river deltas
B) glacier fields
C) mountain ranges
D) tropical rainforests
Answer:
c.mountain ranges
Explanation:
scientists wondered how they where formed and came to the conclusion that they might be forced upward by movement of the earths crust
Answer:
mountain ranges
Explanation:
The world's tallest mountain ranges form when pieces of Earth's crust—called plates—smash against each other in a process called plate tectonics, and buckle up like the hood of a car in a head-on collision.
When ice is placed in lemonade, how does the energy flow?
Answer:
From the lemonade towards the ice
Explanation:
According to the second law of thermodynamics, heat spontaneously flows from hotter objects to colder objects.
In the context of this problem, we have lemonade at, say, room temperature, as well as ice at either equilibrium temperature at the freezing point of water (0 degrees Celsius) or below. This means that the lemonade here is hotter than the ice.
Based on the second law of thermodynamics, heat would flow from the lemonade (the hotter object) towards the ice (the colder object). This is the reason why ice melts: it gains heat from a hotter object and its temperature increases.
If the latent heat of fusion for water is 333.4 J/g, how much heat is required to melt 170 grams of ice at 0 °C?
Answer:
The answer in the comments is wrong! It's not even an option on the test. Just letting people know.
Explanation:
Consider the reaction of hydrogen gas with chlorine gas: H2 + Cl2 → 2HCl 4 molecules of hydrogen gas react with 6 molecules of chlorine gas. 4 molecules of hydrogen gas in this reaction will produce 8 molecules of HCl. 6 molecules of chlorine gas in this reaction will produce 12 molecules of HCl. Which statement BEST describes the role of hydrogen in this chemical reaction? A) Hydrogen is in excess. B) Hydrogen serves as a catalyst. C) Hydrogen is the limiting reactant. D) Hydrogen inhibits the rate of reaction.
Answer:
C. Hydrogen is the limiting reactant
Explanation:
Mole ratios are determined using the coefficients of the substances in the balanced chemical equation of reaction.
H2 + Cl2 -----> 2HCl
1mol:1mol 2mol
1mol of H2 reacts with 1 mole Cl2 to produce 2 moles of HCl.
From the above question, the amount of moles for H2 and for Cl2 are given as well as the amount of HCl each will produce.
We know the following now:
•1 mole of H2 gives 2 moles of HCl. •Thus, 4 molecules of H2 will produce 8 molecules of HCl.
•4 molecules of Cl2 will also produce 8 molecules of HCl.
•Likewise, 6 molecules of Cl2 will produce 12 molecules of HCl
•6 molecules of H2 will also produce 12 molecules of HCl BUT we do not have 6 molecules of H2!! We have only 4!! (From the question) .
This makes us short of H2 molecules. That is, the amount of H2 is in limited supply, which makes H2 the limiting reactant while Cl2 is in excess.
Therefore, we can only make 8 moles of HCl instead of 12 moles.
The best statement which describes the role of hydrogen in this chemical reaction is that hydrogen is the limiting reactant.
Answer:
C) the reactant in excess produces the greatest amount of product.
Explanation:
The statement that is NOT true is that the reactant in excess produce the greatest amount of product. The key to production is the limiting reactant. Reactants in excess have nothing to react with!
A miner working 260m below sea level opened a carbonated soft drink during a lunch break. To his surprise, the soft drink tasted rather "flat." Shortly afterward, the miner took an elevator to the surface. During the trip up, he could not stop belching. Why?
Answer:
Explanation:
The process of dissolving carbon dioxide in water and soft drinks is called carbonation, when there is a fizz, the carbon dioxide escapes from the water as an effervescence.
Due to the increase in atmospheric pressure in the mine, the ability of the dissolved carbon dioxide in the drink to escape is reduced, this accounts for why the drinks tastes flat.
When the miner gets to the ground surface, the atmospheric pressure becomes normal, so in the miner's stomach the carbon dioxide in the soft drink escapes and this results in the miner's continuous belching.
1. A sample of aluminum absorbs 50.1 J of heat, upon which the temperature of the sample increases from 20.0°C to 35.5°C. If the specific heat of aluminum is 0.900 J/g- °C, what is the mass, in grams, of the sample?
Answer:
Mass of aluminium in sample = 3.591 g ≅ 3.6 grams
Explanation:
Given that, A sample of aluminum absorbs 50.1 J of heat, upon which the temperature of the sample increases from 20.0°C to 35.5°C.
the specific heat of aluminum is 0.900 J/g- °C
The relation between heat absorbed and change in temperature is given by, Q = msΔT.
where Q = heat absorbed
m = mass of the substance
s = specific heat of substance
ΔT = change in temperature
Now, in our case, Q = 50.1 J ; s = 0.900 J/g- °C; ΔT= 35.5-20 = 15.5°C
⇒ m = [tex]\frac{Q}{s(T_{2} -T_{1}) }[/tex]
⇒ m = [tex]\frac{50.1}{0.900(15.5)}[/tex] = 3.591 g ≅ 3.6 g
⇒ m ≅ 3.6 g
To calculate the mass of the aluminum sample, the heat absorbed was divided by the product of the specific heat capacity of aluminum and the change in temperature, resulting in a mass of approximately 3.59 grams.
Explanation:To find the mass of the aluminum sample, we'll use the following specific heat formula:
Q = mcΔT
Where:
Q is the heat absorbed, in joules (J)m is the mass of the substance, in grams (g)c is the specific heat capacity, in J/g°CΔT is the change in temperature, in °CFrom the question:
Q = 50.1 JΔT = 35.5°C - 20.0°C = 15.5°Cc for aluminum = 0.900 J/g°CRearranging the formula to solve for mass (m), we get:
m = Q / (cΔT) = 50.1 J / (0.900 J/g°C × 15.5°C)
Calculating the mass of the aluminum gives us:
m = 50.1 J / (13.95 J/g) ≈ 3.59 grams
Four atoms of hydrogen combine with one carbon atom to form CH4, but only two hydrogen atoms combine with one oxygen atom to form H2O. Why?
Answer:
because its water
Explanation:
Answer:
Hydrogen has one valence electron, Atoms may share electrons in order to fill their electron shells, Oxygen has two vacancies in its electron shell, but carbon has four vacancies.
Explanation:
i jus did it on study island :P
when a chemical change occurs, what do you know about the amount of matter in the new substances? what is this known as?( is it suppose to be a science question)
Explanation:
The law of conservation of mass states that the total mass of the products is equal to the total of the reactants.
A chemical change occurs because of a chemical reaction.
In a chemical reaction, the reactants are the starting substances and the products is the finishing substances. The amount of each type of atoms to start with and end with are also equal.
No matter disappears after a chemical reaction.
Answer:
The amount of matter in the new substances is the same as the original.
This is known as the law of conservation of mass.
Final answer:
In a chemical change, the law of conservation of matter indicates that the total amount of matter remains constant, with atoms being rearranged but not created or destroyed.
Explanation:
When a chemical change occurs, the amount of matter in the new substances remains unchanged according to the law of conservation of matter. This fundamental principle asserts that during any chemical reaction, matter is neither created nor destroyed. Instead, the atoms are simply rearranged to form new substances. Therefore, the number and type of atoms present after a chemical change are the same as those before the change took place.
The formation of new substances implies that one kind of matter is transformed into a different kind. Although the properties and appearance might change significantly, the total mass remains constant. For everyday chemical reactions, any mass changes are too negligible to measure, and thus the law holds true. However, in nuclear reactions, which involve changes to the nucleus of an atom, the energy changes can be significant enough to result in detectable mass changes. In such cases, the laws of conservation of matter and energy are considered in a combined way to reflect that the total quantity of matter and energy is fixed.
From either Electronegativity, symbols of elements, ionization energy and atomic radius what is not a trend that varied systematically in the periodic table?
Answer:
Symbols of elements
Explanation:
Symbols of elements corresponding to their names do not vary systematically in the periodic table. The only systematic variation might be an alphabetical order, either ascending or descending, but we don't see this trend in the periodic table.
The other properties, however, vary systematically:
Electronegativity: the closer an element is to fluorine, the more electronegative it is. The closer it is to francium, the less electronegative it is;Ionization energy: it decreases from right to left along the period and down the group, as atomic size increases and there's a lower attraction force between a nucleus and valence electrons;Atomic radius: it increases from right to left along the period and down the group.Why is it important to have a control group in an experimental investigation?
Answer:to see how it effects
Explanation:
a control group provides a baseline for the experiment, shows how the independent variable influenced the experiment and influenced the outcome. a control group provides a comparison for the experiment
Below is an electron dot diagram drawn by a student. What was the student's error in creating this diagram
if any?
[A13+]; [:0:2-12
a
There should be 6 aluminum atoms and 4 oxygen atoms.
b
The charges did not transfer from the cation to the anion to become subscripts correctly.
C There should be five atoms of each element as suvbscripts.
D There was no error.
Answer:
The charges did not transfer from the cation to the anion to yield the correct subscripts
Explanation:
First of all, we see that we have [tex]Al^{3+}[/tex] and [tex]O^{2-}[/tex] in this ionic compound. Since this is a substance, it has a net charge of 0. This means the charge of a cation should be balanced by the charge of the anion.
The lowest common multiple of 3 and 2 is 6, meaning we need:
\frac{6}{3}=2 [tex]Al^{3+}[/tex] cations;\frac{6}{2}=3 [tex]O^{2-}[/tex] anions;Oxygen needs a total of 8 valence electrons, as it's the anion and it gains electrons to obtain an octet. We have 3 oxygen anions in total. Normally, oxygen has 6 electrons, so it needs to gain 2 electrons for each of the 3 oxygen atoms, that is, gain a total of 6 electrons. Those 6 electrons are donated by two aluminum atoms (each having 3 valence electrons), so two aluminum cations are balanced by three oxygen anions.
The Lewis diagram is correct, as it shows an octet on oxygen. We also have the correct charges. The subscripts, though, have to be 2 and 3 for Al and O respectively.