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Worksheets8.5 e, f Evidence of chemical reactions and balanced equations
Total questions: 31
Worksheet time: 2hrs 11mins
Name
Class
Date
1.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
Fe + S --> FeS
a)
balanced
b)
unbalanced
2.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
3.
When materials combine to form new compounds it is a chemical change. Which example is a chemical change?
a)
baking powder fizzing
b)
water boiling
c)
ice melting
d)
sugar cube dissolving
4.
Tearing paper is an example of
a)
physical change.
b)
chemical change.
c)
chemical reaction.
d)
solution.
5.
If you break a piece of glass, the shape of the glass changes, but the properties in the fragments remain the same. Which of the following has occurred?
a)
A chemical change.
b)
A temperature change.
c)
A phase change.
d)
A physical change.
6.
Which process is a physical change?
a)
Rusting iron
b)
Burning coal
c)
Tarnishing silver
d)
Melting ice
7.
Which of the following does not show a chemical change?
a)
change of state of matter
b)
color change
c)
production of a gas
d)
all show a chemical change
8.
Mark is observing a burning candle. He notices the melted wax drips down the side of the candle and hardens again. The candle has____.
a)
formed a new substance
b)
undergone a physical change
c)
undergone a chemical change
d)
undergone a physical and chemical change
9.
A chemical change creates a ______.
a)
change in volume
b)
new substance
c)
mixture
d)
solution
10.
A different chemical substance is formed when _____.
a)
water boils
b)
metal rusts
c)
ice melts
d)
rock is crushed
11.
A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?
a)
cutting a piece of paper
b)
folding a piece of paper
c)
tearing a piece of paper
d)
burning a piece of paper
12.
A science teacher lit a candle and described to his students that some of the wax is burning while some of the wax is melting. Student A states that these are both physical changes. Students B states that these are both chemical changes. Which statement BEST describes the students' conclusions?
a)
Student A is correct.
b)
Student B is correct.
c)
Both are incorrect, because burning wax is a chemical change and melting wax is a physical change.
d)
Both are incorrect, because burning wax is a physical change and melting wax is a chemical change.
13.
A group of students investigated physical and chemical changes using paper. The students recorded their observations in a table.
Which student correctly recorded all the changes that took place?
Which student correctly recorded all the changes that took place?
a)
Student 1
b)
Student 2
c)
Student 3
d)
Student 4
14.
The smell made from a decomposing fish.
a)
Chemical Change
b)
Physical Change
15.
Green bananas turning yellow on their own as they ripen.
a)
Chemical Change
b)
Physical Change
16.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
17.
An gel ice pack getting cold after you put it in the freezer for an hour.
a)
Chemical Change
b)
Physical Change
18.
Melting an ice cube
a)
Chemical Change
b)
Physical Change
19.
Definition of chemical property
a)
Properties that describe how a substance changes into a completely different substance
b)
properties are those that can be observed without changing the identity of the substance
20.
What is an example of a physical property?
a)
reactivity
b)
color
21.
Definition of Physical property
a)
properties are those that can be observed without changing the identity of the substance
b)
Properties that describe how a substance changes into a completely different substance
22.
Example for Chemical property
a)
ice melting
b)
not easily reversed
23.
Example for Physical Property
a)
melting point
b)
flammability
24.
Which is an example of a chemical reaction?
a)
paper cut into small pieces
b)
chocolate melting in a pan
c)
flour and sugar mixed in a bowl
d)
cookies baking in an oven
25.
Changes in which new substances are formed are called
a)
physical changes
b)
chemical changes
26.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
27.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
28.
Which is a physical change?
a)
digesting food
b)
burning natural gas
c)
exploding firework
d)
chopping onions
29.
Digesting your food is an example of
a)
chemical change
b)
physical change
30.
Dissolving sugar in water is an example of a
a)
physical change
b)
chemical change
31.
Photosynthesis is an example of a
a)
physical change
b)
chemical change
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