“Identifying Chemical Changes” Answers
Data & Analysis:
Reaction Red Water Inflating Balloon
Dr. Foamy Professor Flame Indicators
Color Change
Production of Gas
Perhaps a Temperature Change Production of a Gas
Temperature Change Light
Sound Color Change Temperature Change Perhaps production of a Gas 1) Determine whether each reaction was spontaneous.
In chemistry, spontaneous refers to whether energy is required for the reaction to occur.
Spontaneous Reaction
(yes or no) Red Water
Yes
Inflating Balloon
Yes
Flame
No
Foamy
Yes
Station General Questions:
1) How do you think bleach works in your washing machine? What is occurs when the bleach
comes into contact with stains?
The bleach reacts with the change and results in a color change.
2) Why is it not a good idea to combine household cleaners; what can happen?
An invisible, odorless, potentially harmful gas may be produced.
Ciardi, T Chemical Change Answers 1 3) What is the basic difference between a physical change and a chemical change?
The basic difference between a physical change and a chemical change is that a chemical
change results in a new substance.
4) When heat is added to liquid water, it becomes a gas. Is this a chemical or physical change?
Explain.
Liquid water changing to a gas is a physical change. It is a change in phase. No new
substance is produced; the gas is still H2O.
Ciardi, T Chemical Change Answers 2