Which change is exothermic?(1) freezing of water(2) melting of iron(3) vaporization of ethanol(4) sublimation of iodine

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Answer 1
Answer: The answer is (1) freezing of water. The energy of different status is increase from solid to liquid to gas. So the change of liquid to solid is exothermic. The other three are endothermic.

Related Questions

Which subatomic particle(s) are found in the nucleus of the atom?. Enter the subatomic particle or particles separated by commas.
Chemical changes ________ involve the breaking and making of chemical bonds.A) AlwaysB) NeverC) SometimesFill in the blank
Which statement best describes the nucleus of an aluminum atom?(1) It has a charge of +13 and is surrounded by a total of 10 electrons.(2) It has a charge of +13 and is surrounded by a total of 13 electrons.(3) It has a charge of –13 and is surrounded by a total of 10 electrons.(4) It has a charge of –13 and is surrounded by a total of 13 electrons.
Which of the following is not an example of a chemical change?.
The element carbon is found on the right side of the periodic table and is known as a _________, which means that it is normally a poor conductor of heat and electricity and is dull and brittle.

Abdid is an astronomer who has been observing objects that orbit the Sun in the asteroid belt. He finds a previously undiscovered round, rocky object that is not similar in shape to the rest of the asteroids. What has Abdid most likely found?

Answers

Answer:

Abdid has most likely found a new dwarf planet.

Explanation:

Dwarf planets are too small to be considered planets, but are also two big to be considered something else. A dwarf planet has to have sufficient mass so that the self-gravity is strong enough to create its round shape. Other qualifications of a dwarf planet is that it has not cleared the neighborhood around its orbit and it cannot be a satellite. Based on the location, size, and shape of the object Abdid has discovered, it is likely he discovered a new dwarf planet in the asterioid belt. One of the most famous is Ceres.

since it is round and it is the asteroid belt it is most likely that he found a dwarf planet 

How much heat energy is needed to raise the temperature of 59.7g of cadmium from 25°C to 100°C? The specific heat of cadmium is 0.231 J/g °C.

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Heat energy can be calculated by using the specific heat of a substance multiplying it to the mass of the sample and the change in temperature. It is expressed as: 

Energy = mCΔT
Energy = 59.7 (0.231) (100-25)
Energy = 1034.30 J

The amount of heat energy needed to raise the temperature of 59.7g of cadmium from 25°C to 100°C is 1,034.3J.

How to calculate amount of energy?

The amount of heat energy needed to raise a temperature can be calculated using the following expression;

Q = mc∆T

Where;

  • Q = amount of energy released or absorbed
  • m = mass of substance
  • c = specific heat capacity
  • ∆T = change in temperature

According to this question, 59.7g of cadmium is needed to be raised from 25°C to 100°C. The amount of heat needed can be calculated as follows:

Q = 59.7 × 0.231 × (100 - 25)

Q = 1,034.3J

Learn more about energy at: brainly.com/question/33447128

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How does an element differ from a compound

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Elements are one , but compound is elements all together to form something.


-_- Compounds n Elements -_-


A compound is a substance formed when two or more elements are chemically joined. Water, salt, and sugar are examples of compounds.

When the elements are joined, the atoms lose their individual properties and have different properties from the element they are composed Of .


                                            - Hope that this helps out alot bro .

Which statement defines the temperature of a sample of matter?1) Temperature is a measure of the total electromagnetic energy of the particles.
2) Temperature is a measure of the total thermal energy of the particles.
3) Temperature is a measure of the average potential energy of the particles.
4) Temperature is a measure of the average kinetic energy of the particles.

Can someone help me with this? 

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The correct answer is D.

It is known with definition of temperature.
Temperature of a system is average energy of microscopic motions of a single particle.
It's average kinetic energy.

Which is an example of pseudoscience? A. use of X-rays to observe the bones of the arm B. use of DNA analysis to determine paternity C. use of vaccines to prevent the occurrence of disease D. use of astrology to predict the personality of a child

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Answer is D. use of astrology to predict the personality of a child

Astrology is not a science, astronomy is a science.
Astrology is more related to myths, legend and human interpretation of the sky, universe, planets.
Which is an example of pseudoscience? 
Answer:
D. use of astrology to predict the personality of a child 


1a. Identify the chemical_____ comes from the breakdown of proteins.

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is it amino acids???????