WRITTEN WORK 4: HEAT AND ENERGY

Which of the following is an example of endothermic reaction ?

• dissolving an acid in the water

• melting ice

• freezing water

• corrosion of metal

Which of the following is an example of exothermic reaction ?

• photosynthesis

• melting ice

• dissolving an acid in water

• acid and base reaction

How can you change the states of matter of an object?

• you cannot change the states of matter

• do nothing they will change on their own

• add or remove heat

How does heat flow?

• Cold to hot
• Hot to cold
• Heat doesn't flow!
• Wait what?

What happens to the particles of a substance when heat is added?

• The particles move slower
• Nothing
• The particles move faster

What type of system of thermodynamics is the hot liquid inside a thermos bottle ?

• open system

• closed system

• isolated system

Debbie's mother has different types of pots in her kitchen. Many of them are made of copper and aluminum. Some are made of glass. Which of the following is the best reason why the pots are made of these materials?

• They are able to stop the flow of heat.

• They are good insulators of heat.

• They keep the same amount of heat.

• They are good conductors of heat.

Endothermic reactions happen when:

• there is a releases heat and light in the environment

• it absorbs heat and light from the surroundings

• it absorbs and release heat and light from the surroundings

• it neutralizes the reactants with the products

Exothermic reactions happen when

• there is a release heat and light in the environment

• it absorbs heat and light from the surroundings

• it absorbs and releases heat and light from the surroundings

• it neutralizes the reactants with the products.

What is an isolated system?

• A system in which mass or energy can be lost to or gained from the environment

• A system that does not interact with its surroundings; its total energy and mass stay constant.

• A system that does not interact with its surrounding mass stays the same but energy is lost.

• A system that does require human intervention in which mass or energy can be lost to or gained from the environment