Chemical Reactions

Chemical properties of a substance include all of the following except..

• its boiling point 
• its toxicity 
• its flammability 
• its reactivity 

Which of the following is a chemical change rather than a physical change 

• boiling water at 100 C
• chopping up a piece of wood. 
• cooking a cake 
• ice carbon dioxide sublimating to gas 

The only way you can be certain that a chemical reaction has occured is by? 

• Light has been emitted 
• a colour change has occurred 
• bubbles appear 
• identifying one or more new chemical products 

An gel ice pack getting cold after you put it in the freezer for an hour.

• Chemical Change
• Physical Change

Which of the following IS a chemical change

• using chalk
• water freezing
• slicing cheese
• digestion

In an endothermic reaction, heat is ...

• taken in or absorbed
• given out or released 

Baking bread and cooking an egg are examples of....?

• Endothermic processes
• Exothermic processess
• None of these 

Exothermic reactions...

• Absorb energy
• Release energy
• Release Color
• Absorb Color

Ice melting

• Chemical Change
• Physical Change

What happens in ALL chemical changes?

• Change in state of matter
• A new substance is formed
• Bubbles are produced
• An explosion