Chemical Reactions Review

If a chemical reaction is EXOTHERMIC, the temperature would....

• Stay the same
• Increase
• Decrease

The law of conservation of matter states that matter cannot be

• created or transformed

• created or destroyed

• transformed or destroyed

• transformed or evaporated

How do you know that setting off a firework is a chemical change?

• The firework changes its phase of matter.

• It is not a chemical change, it's physical.

• It requires energy to make the firework go off.

• It releases gas and creates heat and light.

A chemist is doing an ENDOthermic reaction. The starting temperature was 25 degrees Celsius. Which of the following would be a reasonable ending temperature

• 44 degrees

• 30 degrees

• 15 degrees

• 25 degrees

An ice pack in an example of

• exothermic

• endothermic

• both

• none

Which of the following is a characteristic of an exothermic reaction?

• Absorption of heat

• No change in temperature

• Decrease in pressure

• Release of heat

Which processes from the table can be used as evidence to identify the formation of a new substance?

• Processes A, B, C, and D

• Processes B, C, E, and F

• Processes B, C, D, and F

• Processes C, D, E, and F

Which of the following is an example of a physical change?

• Burning wood in a campfire.

• A bicycle rusting when it is left outside.

• A chainsaw cutting down a tree.

• Cooking an egg on the stove.

During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 

• Warm
• Cold

Baking bread: releases gas, changes color, new smell

• Chemical Change

• Physical Change