Chemical and Physical Changes - Worksheet 4
Grade 5•Science•Chemical and Physical Changes
Aligned to: 5-PS1-1
Answer the following questions about chemical physical changes.
1.
Why can you reverse melting ice (by freezing it again) but you cannot reverse burning wood?
A.Wood is heavier than ice
B.Melting is a physical change (same substance), but burning is a chemical change that creates new substances like ash and gas
C.You can reverse both changes
D.Neither change can be reversed
2.
You mix baking soda and vinegar, and bubbles form. Is this a physical or chemical change, and what evidence supports your answer?
A.Physical change, because it looks different
B.Chemical change, because gas bubbles are produced, indicating a new substance formed
C.Physical change, because you can reverse it
D.Neither, because nothing really changed
3.
Which is a sign that a chemical change has occurred?
A.The object gets smaller
B.Bubbles of gas are produced
C.The object is cut in half
D.Water evaporates
4.
Which is a physical change?
A.Rusting iron
B.Burning wood
C.Melting ice
D.Baking a cake
5.
Baking a cake is an example of:
A.A physical change
B.A chemical change
C.No change
D.A reversible change
6.
Can a physical change usually be reversed?
A.No, never
B.Yes, usually
C.Only sometimes
D.It depends on the material
7.
Burning paper is what type of change?
A.Physical change
B.Chemical change
C.No change
D.Reversible change
8.
All changes in color indicate a chemical change.
9.
Chemical changes produce new substances.
10.
Cutting paper is a chemical change.
11.
Physical changes can usually be .
12.
Burning creates new substances, so it is a change.
13.
A student says, 'I crushed a cracker into crumbs, so I made a chemical change.' Do you agree or disagree, and why?
A.Agree, because the cracker looks different now
B.Disagree, because crushing only changes size and shape -- the cracker crumbs are still made of the same substance
C.Agree, because you cannot put the cracker back together
D.Disagree, because crackers cannot change