Question

Practice Test-Unit 9: Thermachemistry Name Energy analogy Uise the above illustration for the nest 2 questions. A ball is placed om top of a hill at poimA.ntden starts rolling down the hill and through points B, Cand D 1. Which bas least smount of poiemil ? A B CD 2. Which has least amount of kinetic energy A BCD 3. Which of these statements is TRUE? . Hem is the measurement of the average kinetic energy of the molecules b. Temperature is the measurement of the flow of energy from one thing to another e Temperature is the measurement of the averape kinetic energy of the molecules d. Heat and temperature are synonyms, that is, they mean the same thing 4. Which of the following statemens is FALSE? a· The amount of beat added lo melt a substance is the sames the amount of heat that would be removed to freeze it b. The temperature of water as it boils increases slowy c. The heat needed to melt one gram of a substance is called the heat of fusion. d. The hew released by one gram of a substance as it condenses from a gas into a liquid is called the heat of vaporization. S. After placing a pan of water on a hot stave, it starts boiling. While it boils, will the temperature of the iquid water increase? a. Yes the temperature keeps going up b. It depends on the volume of water c. No the temperature doesn't change while boiling d. It may or may not, depending on the shape of the container

1,2,3,4, and 5

Answer 1

hey

1)Least amount of potential energy-C

Potential energy is a function of height(m*g*H)

so, C has least height so minimum potential energy

2)least kinetic energy-A

it is a function of velocity

since A is at rest while B,C D are moving so, least kinetic energy is of A

3)Option C

Temperature is measurement of average kinetic energy of molecule.
because avg. K.E=(3/2)*K*T where T is temperature and K is boltzman constant.

4)D

This is because
heat of vaporisation is the energy absorbed when liquid converts to gas.
5)C

When water starts boiling,it gets converted into vapours

so the amount of temperature which we provide at this stage is used for vaporisation and not to increase temperature

so, as long as it boils, its temperature remains constant.

Hope it helped

Thanks!!!