The boiling of water and sublimation of iodine crystals are endothermic processes.
Answer: Option B & C
Explanation:
Endothermic process are the classifications of chemical reactions where the heat is absorbed by the system from the surroundings. As the matters can exists in three phases like solid, liquid and gases.
The endothermic process occurs by absorption of heat energy by the system. So according to the given options, the boiling of water and iodine crystal sublimation follows endothermic process. In the boiling of water occurs when the water molecules absorb heat from the surrounding and convert to gas phase.
Similarly, the sublimation of iodine crystals also require heat energy from the surrounding to break the bonds of the iodine crystals to sublimate to gas phase. Thus the boiling of water and sublimation of iodine crystals are the examples of endothermic processes.
65 grams of calcium equal how many moles?
1.6218377410367840 that would be your answer but dont forget to round it to the closets number
when iron rusts it no longer conducts electricity this is because
it has gone through the process of a chemical reaction, and is no longer in its original form, which makes it lose its means of conductivity
Final answer:
Iron rusts when exposed to oxygen and water, forming a red-brown hydrated metal oxide called rust. This rust is a poor conductor of electricity compared to iron metal. The rust continually flakes off, exposing fresh metal surface susceptible to further oxidation.
Explanation:
Iron rusts when it is exposed to oxygen and water. The rust that forms on iron is a red-brown hydrated metal oxide known as Fe2O3 xH2O. When iron rusts, it no longer conducts electricity because the rust is a poor conductor compared to the original iron metal. The rust flakes off continuously, exposing a fresh metal surface that is vulnerable to further reaction with oxygen and water.
Which force always attracts objects to each other?
Gravity is a force that always attracts or pulls objects toward each other without direct contact or impact. Gravitational attraction depends on the mass of the two objects and the distance they are apart. Objects on Earth are pulled toward the center of Earth.
After a rock breaks down, materials that are left combine with organic materials to form
Here is the complete sentence: After a rock break down, materials that are left combine with organic materials to form SOIL.
The process by which rocks are broken down is called weathering. There are different type of weathering, but the resultant effect of all of them is to break down rocks into smaller particles. The broken down particles usually combine with mineral content, moisture, gases and humus in order to form a complete soil.
A reaction between an acid and a base is called a(n) ________________ reaction.
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What mass of anhydrous calcium chloride, CaCl2, should be dissolved in 590.0 grams of water in order to produce a 0.82 m solution
First convert the 590.0 grams of water to liters of water.
590.0 grams x (1 L / 1000 grams) = 0.59 L
Since we're dealing with concentration, recall this formula:
Molarity (M) = (moles of solute) / (liters of solution)
We know the Molarity and the Liters
0.82 M = (moles) / 0.59 L
To find the moles multiply 0.59 on both sides.
The result is 0.4838 moles of CaCl (the solute).
Then change moles into grams because the question wants grams.
In order to convert the moles of a substance to grams, you will need to multiply the mole value of the substance by its molar mass which is 110.986.
(0.4838 moles CaCl2) x (110.986 g CaCl)/ 1 mol CaCl2
= 53.7g CaCl
To produce a 0.82 m solution, dissolve 53.61 grams of anhydrous calcium chloride in 590.0 grams of water.
To solve this problem, we need to understand the concept of molarity and how to calculate the mass of a solute required to make a solution of a given molarity.
Molarity (M) is defined as the number of moles of solute (n) divided by the volume of the solution (V) in liters:
[tex]\[ M = \frac{n}{V} \][/tex]
To find the mass of the solute (m), we need to use the molar mass (Molar mass = molecular weight in g/mol) of the solute.
[tex]\[ \text{Molar mass of CaCl2} = \text{Atomic mass of Ca} + 2 \times \text{Atomic mass of Cl} \] \[ \text{Molar mass of CaCl2} = 40.08 \text{ g/mol} + 2 \times 35.45 \text{ g/mol} \] \[ \text{Molar mass of CaCl2} = 40.08 \text{ g/mol} + 70.90 \text{ g/mol} \] \[ \text{Molar mass of CaCl2} = 110.98 \text{ g/mol} \][/tex]
Now, we can rearrange the molarity equation to solve for the number of moles (n):
[tex]\[ n = M \times V \][/tex]
Now we can calculate the number of moles of CaCl2 needed for a 0.82 m solution:
[tex]\[ n = 0.82 \text{ M} \times 0.5900 \text{ L} \] \[ n = 0.4838 \text{ mol} \][/tex]
Finally, we can find the mass of CaCl₂ required by multiplying the number of moles by the molar mass:
[tex]\[ m = n \times \text{Molar mass of CaCl2} \] \[ m = 0.4838 \text{ mol} \times 110.98 \text{ g/mol} \] \[ m = 53.61 \text{ g} \][/tex]
Therefore, the mass of anhydrous calcium chloride that should be dissolved in 590.0 grams of water to produce a 0.82 m solution is approximately 53.61 grams.
"Calculate the amount of energy it will take to change 20.0 Grams of Water from -3 C to changing it all to vapor at sea level. Show all your work for credit."
Please show work! Would really appreciate it, last assignment for Chemistry >
All the elements of a family in the periodic table have what feature in common?
They all have the same number of electrons in the electron cloud.
The have same number of valence electrons
Explanation:The elements in the same group has similar number of valence electrons. For instance All the alkali metals in Group 1 have 1 valence electron, so they all tend to react the same way with other substances. The elements in each group have the same number of electrons in the outer orbital which are responsible for the chemical properties of element so we can say that each family has the same chemical properties.
How was soap made? I’m very confused how soap is made and it smell good to all the time
Answer:
"The cold process method" is the most popular soap making process today. Some soap makers use the hot process, which was much more significant in the past centuries. Handmade soap is technically glycerin soap and it differs from industrial soap.
Explanation: Ready-Made soap base is already soap, so all the steps necessary to producing the soap itself are eliminated. The soapmaker's concentration can be focused on the artistic, aesthetic and beneficial aspects of the soap. Also referred to as "melt and pour" or "MP" soap, ready-made soap base comes in a solid block.
Soap is made through a process called saponification, which involves the reaction between fats or oils and an alkali solution. The fats and alkali are heated together and mixed to form soap and glycerol. Fragrances and colors can be added to the soap to make it smell good.
Soap is made through a process called saponification, which involves the reaction between fats or oils and an alkali solution.
Traditionally, animal fats or plant oils were used along with a strong alkali like lye.
The fats and alkali are heated together and mixed to form soap and glycerol.
The soap is then separated and purified through filtration and washing.
Finally, fragrances and colors can be added to the soap to make it smell good.
What is a light year?
A.The distance light travels in one earth year
B.The distance light travels from the sun to the earth
C.The distance light travels in one orbit of the moon
D.The time it takes light to travel across the universe
Final answer:
A light year is the distance light is able to travel in one year in space, which is approximately 9.5 trillion kilometers. It is often used by astronomers to measure large distances between celestial objects such as stars and galaxies. Correct answer to the student's question is option A.
Explanation:
A light year is a unit of distance equal to the distance light travels in one year. When light travels in the vacuum of space, it moves at a speed of about 300,000 kilometers per second(km/s), which is the fastest speed anything can travel in the universe.
Therefore, the true answer to the question is A.
The distance light travels in one earth year. This equates to approximately 9.5 trillion kilometers.
Light-years are commonly used by astronomers to measure vast distances in the universe. For example, the nearest star to us, Proxima Centauri, lies about 4.24 light years away from Earth, and the Andromeda Galaxy, our closest large galactic neighbor, is roughly 2.5 million light years distant.
When we observe celestial bodies like stars and galaxies, we see them as they were years, centuries, or even millennia ago because their light has taken that long to reach us.
what is the bronsted acid of NO2- + H2O HNO2 + OH-
H2O -Bronsted Acid
Explanation;Bronsted-Lowry acids are H+ donors , while Bronsted-Lowry bases are H+ acceptors .A reaction of a Bronsted-Lowry acid and a Bronsted base is a neutralization reaction that is characterized by H+ transfer.The above reaction is an example of base ionization or dissociation where;B (aq) + H2O (l) → BH+ (aq) + OH– (aq)
That is; Base + Acid will give a conjugate acid + hydroxide ion
In our case; NO2- + H2O → HNO2 + OH- ; H2O is the H+ donor and thus, it is a Bronsted Acid.In the gender reaction water acts as the Bronsted acid because it donates a proton to the nitrite ion which in turn acts as the Bronsted base.
Explanation:In the given equation NO2- + H2O -> HNO2 + OH-, the Bronsted acid is H2O. According to the Bronsted-Lowry definition an acid is a substance that can donate a proton (H+), and a base is a substance that can accept a proton. In this reaction water (H2O) donates a proton to the nitrite ion (NO2-) and hence it is the Bronsted acid. The nitrite ion is the Bronsted base because it accepts a proton from water to form nitrous acid (HNO2).
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Scientists learn about the universe by studying the light that comes to Earth from stars and other objects in space. If you were a scientist hoping to understand the universe, what three questions would you ask?
there's really no specific answer but mine would be...
1. how does that light show from earth?
2. will that light ever dim?
3. are some stars bright but just not bright enough that we can see?
How many stars are in space?
How far away from Earth are certain stars?
Are there other planets like Earth?
What is the universe?The universe is everything. It includes all of space and all the matter and energy that space contains.
Three questions are:
How many stars are in space?How far away from Earth are certain stars?Are there other planets like Earth?Learn more about the universe here:
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What is a gamma ray?
A gamma ray or gamma radiation, is a penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves and so imparts the highest photon energy
penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei
a sound waves frequency is 4 hz and its wavelength is 8 meters. what is the waves speed
Answer:
32 m/s
Explanation:
Frequency is the number of waves that pass a particular point in 1 second
Wavelength is the distance between 2 crests or 2 troughs
Speed = frequency x wavelength
Substituting the values
Speed = 4 Hz x 8 m
Speed = 32 m/s
Waves speed is 32 m/s
The speed of the sound wave is 32 meters per second.
To find the speed of the wave, we can use the relationship between speed, frequency, and wavelength, which is given by the equation:
[tex]\[ \text{Speed} = \text{Frequency} \times \text{Wavelength} \][/tex]
Given that the frequency of the sound wave is 4 Hz (hertz) and the wavelength is 8 meters, we can plug these values into the equation:
[tex]\[ \text{Speed} = 4 \, \text{Hz} \times 8 \, \text{m} \] \[ \text{Speed} = 32 \, \text{m/s} \][/tex]
Therefore, the speed of the sound wave is 32 meters per second. This is a fundamental relationship in wave mechanics, where the speed of a wave is the product of its frequency and its wavelength.
Emma sings into a microphone. The sound is transferred from the microphone to a loudspeaker that is plugged into the wall. Her voice comes out of the loudspeaker and sounds much louder than before.
In this system, sound energy is being transformed into _______ energy and then back into _______ energy.
Electrical energy and back to sound energy
Electrical then back into sound
Which functional group is found in an ester
RCOOR. the answer is first option
what are the four points of food safety?
The four steps of food safety are:
Clean: Wash your hands and clean surfaces oftenSeparate: Don't cross-contaminate the foodCook: Cook the food to the right temperatureChill: Refrigerate promptlyHope this helps! If you need more help or have any questions just message me! :)
Question 3 (3 points)
Which of these natural resources is nonrenewable?
sugarcane
sunlight
corn
oil or petroleum
A book is resting on a table. The book has
A)kinetic energy only.
B)potential energy only.
C)both kinetic and potential energy.
D)neither kinetic or potential energy.
Hey there!
The correct answer should be B. Potential Energy Only
Potential energy is the energy stored in an object because it isn’t moving/isn’t in motion
Hope this helps you!
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Which arrow represents the activation energy of the forward reaction
B) B
Explanation;Activation energy is the least possible amount of energy which is required to start a reaction or the amount of energy available in a chemical system for a reaction to take place.A reaction won’t occur unless atoms or molecules of reactants come together. This happens only if the particles are moving, and movement takes energy. Reactants have to overcome forces that push them apart. The energy is called activation energy.The activation energy for the forward reaction is represented by the arrow from the reactants to the transition state in a reaction diagram.
Explanation:In a reaction diagram, the activation energy for the forward reaction is represented by the arrow from the reactants to the transition state. This arrow shows the energy barrier that must be overcome for the reaction to occur. The activation energy is the minimum amount of energy that reactant particles must have in order to successfully collide and form products.
Which of the following is true for the equilibrium constant of a reaction? Its value remains constant at different temperatures. It is a ratio of coefficients of reactants to products. It is represented by the symbol K. Its value is always less than 1.
Answer:
Option C :-It is represented by K.
Explanation:
Equilibrium constant is the ratio of products to reactants.
It has a constant value at specific temperature. If temperature changes, K also changes.
It has a value in the range of 0.001 to 1000.
Answer: Option (c) is the correct answer.
Explanation:
Equilibrium reaction means when rate of forward reaction is equal to rate of backward reaction.
And, relationship between the amount of products and the amount of reactants present in an equilibrium reaction at a given temperature is known as equilibrium constant.
Equilibrium constant is denoted by 'K'.
For example, [tex]xA + yB \rightarrow zC[/tex]
The equilibrium constant for this reaction will be as follows.
K = [tex]\frac{[C]^{z}}{[A]^{x}[B]^{y}}[/tex]
Therefore, it is the ratio of products to reactants. And, if value of K > 1 then it means that the mixture contains mostly products whereas K < 1 means that the mixture contains mostly reactants.
Hence, we can conclude that out of the given options it is represented by the symbol K, is true for the equilibrium constant of a reaction.
What do electromagnetic waves consist of? (choice)
*frequency
*electric & magnetic fields
*longitude
Electromagnetic waves consist of both electric and magnetic field waves. The creation of all electromagnetic waves begins with an oscillating charged particle, which creates oscillating electric and magnetic fields.
Final answer:
Electromagnetic waves consist of oscillating electric and magnetic fields, and propagate at the speed of light.
Explanation:
Electromagnetic waves consist of oscillating electric and magnetic fields. These waves propagate at the speed of light and can be described as transverse waves. They have different frequencies, wavelengths, and energies, but all travel at the same speed in a vacuum.
Which way does heat flow?
Hey im happy to help!
Heat can float from one place to another, like all energy.Heat floats in solids by conduction, that happens because the molecules hit one another.Heat within the solid will flow from hot to cold.Heat will flow downward if its cold there.
Hope this helps, have a great rest of your day!
Answer:
Heat flows in a cycle. Heat flows downward towards cold air.
Convert 23.92inHg to torr.
= 607.568 Torr
Explanation;1 in of mercury is equivalent to 25.4 Torr
Therefore;
23.92 InHg will be equal to;
23.92 × 25.4
= 607.568 Torr
When there are equal forces from opposite directions acting on an object, the forces are said to be which of the following?
Positive
Negative
Balanced
Gravitational
When equal forces from opposite directions act on an object, they are said to be balanced. Such a state doesn't change the motion of the object, which aligns with Newton's First Law of Motion or The Law of Inertia.
Explanation:Balanced forces occur when the total force applied to an object from one direction equates to the total force applying from the opposite direction. Hence, the object will remain still or continue moving at a constant speed in a straight line. It's important to note that under balanced forces, the motion state of the object doesn't change, also known as Newton's First Law of Motion or The Law of Inertia.
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49 POINTS!!! PLEASE HELP ME HURRY!!!
Find the volume of each figure to the nearest tenth.
V = L x W x H
V = 11 x 5 x 6
V = 330
the volume is V = 330 cm
V=L*W*H
NEED HELP ASAP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Select the choice that best completes the following sentence.
Simple machines
A.
are tools that make work easier.
B.
reduce the amount of energy needed to do work.
C.
are made up of multiple moving parts.
D.
cannot be combined to make compound machines.
The answer would be A: Simple machines are tools that make work easier.
➷ Simple machined are tools that make work easier. Option A is correct.
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Which of the following pairs of factors are most directly responsible for increasing the concentration of salt in the ocean?
A.
condensation and sea breezes
B.
transpiration and weathering
C.
infiltration and delta formation
D.
evaporation and iceberg formation
D. evaporation and iceberg formation
because weathering rocks are mde up of salt and minerals creating iceberg formations and the evaporation density changes throughout concentration in the ocean.
Final answer:
The two factors most directly responsible for increasing the concentration of salt in the ocean are evaporation and iceberg formation. Evaporation leaves salts behind in the water, and iceberg formation concentrates salts by freezing freshwater, leaving salts in the ocean.
Explanation:
The question asks which pair of factors are most directly responsible for increasing the concentration of salt in the ocean. The correct answer is D. evaporation and iceberg formation. Evaporation of ocean water increases the salt concentration because when water evaporates, it leaves the salts behind, thus concentrating them. Iceberg formation similarly contributes to salt concentration. When sea water freezes to form icebergs, it primarily forms as freshwater ice, leaving the salts in the surrounding water, thus increasing its salinity.
The same species of organisms with different physical traits are called
The correct answer is - subspecies.
The subspecies represents an aggregate of phenotypically similar populations of a species. They inhabit a geographic subdivision of the species. They also are differing taxonomically from the other members of the species.
The subspecies are part of a species. They are able to mate with the other members of the species without any problems if they come to a situation like that, and produce healthy offspring. In general, the subspecies is pretty much the same as the species, just that it exhibits some specific physical traits that are not found in the rest of the members of the species.
A perfect example for this is the leopard. The African leopard has short and less dense fur, is larger, lighter in coloration, while the Amur leopard has much denser and longer fur, is slightly smaller, and is darker in coloration. Both of them are part of the same species, but exhibit specific physical traits that make them a subspecies.
What is the specific latent heat of fusion of ice if it takes 863 kJ to convert 4.6 kg of ice into water at 0 C?
Answer:
[tex]1^{f} =187.7 \frac{J}{kg}[/tex]
Explanation:
SO in order to calculate the specific latent heat of fusion, you need to remember the formula:
[tex]1^{f} =\frac{Q}{m}[/tex]
Where [tex]1^{f}[/tex] representes the specific latent heart of fusion.
[tex]Q[/tex] represents the heat energy added, usually represented in kJ
[tex]m[/tex] represents the mass of the object, in kg.
Now that we have our formula we just have to put our values into the formula:
[tex]1^{f} =\frac{Q}{m}[/tex]
[tex]1^{f} =\frac{863kJ}{4.6kg}[/tex]
[tex]1^{f} =187.7 \frac{J}{kg}[/tex]
SO our answer would be [tex]1^{f} =187.7 \frac{J}{kg}[/tex]