0

Kinetics and Thermodynamics Online Quiz

Description: Kinetics and Thermodynamics # What is the Law of Conservation of Energy #Define exothermic and Endothermic
Number of Questions: 25
Created by:
Tags: science chemistry
Attempted 0/24 Correct 0 Score 0

Which changes will increase the reaction rate of any chemical reaction?

  1. Increase concentration / decrease temperature

  2. decrease concentration / increase temperature

  3. decrease concentration / decrease temperature

  4. increase concentration / increase temperature


Correct Option: D

After any reaction, the total energy of system and surroundings is ....

  1. equal to the total energy before the reaction

  2. greater than the energy before the reaction

  3. less than the energy before the reaction

  4. can not be determined


Correct Option: A

What is the Law of Conservation of Energy?

  1. Energy/mass can be created or destroyed

  2. Energy can be created or destroyed but mass cant be

  3. Energy can't be created or destroyed but mass can be

  4. Energy/mass can't be created or destroyed


Correct Option: D

Why will it melt faster in water?

  1. Water molecules will be moving faster than air molecules

  2. Air molecules will be more dense than water molecules

  3. Air molecules move randomly and water molecules don't

  4. Water molecules are more dense and collide more often


Correct Option: D

Will an ice cube melt more quickly in 30*C air or 30*C water?

  1. Air

  2. Will be the same for both

  3. Water


Correct Option: C

What kind of reaction happens when the products have more energy than reactants?

  1. Exothermic reaction

  2. Thermic reaction

  3. Endothermic reaction


Correct Option: C

What kind of reaction has more energy in reactant than in products?

  1. Endothermic reaction

  2. Thermic reaction

  3. Exothermic reaction


Correct Option: C

An example of an endothermic process is photosynthesis

  1. True

  2. False


Correct Option: A

An example of an exothermic process would be lighting a campfire.

  1. True

  2. False


Correct Option: A

True or false: Endothermic reactions decreases in temperature and releases energy

  1. True

  2. False


Correct Option: B

True or false: A exothermic process will release energy and increase in temperature.

  1. True

  2. False


Correct Option: A

When molecules collide they do not transfer all their energy. They lose some energy as ________

  1. Thermal energy (heat)

  2. Sound

  3. Vibrations

  4. Recoil


Correct Option: A

In what direction does thermal energy always transfer?

  1. Always moves up

  2. Always moves down

  3. Low to High

  4. High to Low


Correct Option: D

What must molecules do in order to transfer thermal energy

  1. They must have high concentrations

  2. They must break bonds

  3. They must collide with another molecules


Correct Option: C

How do molecules move when they have a large amount of thermal energy?

  1. Molecules move faster

  2. Molecules move slower

  3. Molecules stop moving


Correct Option: A

Define exothermic

  1. form of energy that flows from warmer to colder objects

  2. average kinetic energy of molecular collisions

  3. chemical reaction that gives off heat

  4. chemical reaction that absorbs heat


Correct Option: C

Define Endothermic

  1. form of energy that flows from warmer to colder objects

  2. average kinetic energy of molecular collisions

  3. chemical reaction that gives off energy

  4. chemical reaction that absorbs energy


Correct Option: D

Define temperature

  1. form of energy that flows from warmer to colder objects

  2. average kinetic energy from molecular collisions

  3. chemical reaction that gives off energy

  4. chemical reaction that absorbs energy


Correct Option: B

Define heat

  1. form of energy that flows from warm object to cold object

  2. average kinetic energy available through collisions

  3. chemical reaction that gives off energy

  4. chemical reaction that absorbs energy


Correct Option: A

Why does increasing concentration increase the rate of a chemical reaction?

  1. Less molecules in area = faster reaction rate

  2. More molecules in area = more chances for collision

  3. Less molecules in area = higher molecule speed

  4. More molecules in area = slow diffusion rate


Correct Option: B

What does the word "rate" mean in reaction rate?

  1. How many reactants combine over a period of time

  2. How fast the temperature will increase or decrease


Correct Option: A

In regards to concentration, how do molecules move?

  1. High to Low

  2. Low to High

  3. Randomly


Correct Option: A

What can make particles move faster?

  1. A reaction

  2. Free cookies

  3. Fire

  4. Thermal energy


Correct Option: D

When and under what condition are particles in motion?

  1. They only move when they get enough energy

  2. Solids don't move and everything else moves a lot

  3. Molecules are always moving but are dependent on energy

  4. Gases move slowest and solids move the most


Correct Option: C
- Hide questions