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Chemical Reactions

Total questions: 15

Worksheet time: 26mins

Name
Class
Date
1.

Which of the following are chemical reactions? Select all that apply.

a)

sugar dissolving in water

b)

water turning into steam

c)

burning wood

d)

mixing baking soda and vinegar

e)

tearing paper

2.

Which of the following statements best describes what occurs during a chemical reaction?

a)

some atoms are destroyed

b)

atoms rearrange but do not physically touch

c)

a new substance is formed

d)

new atoms are created

3.
True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 
a)
true
b)
false
4.

The substances on the left side of the arrow in the chemical equation shown are called the

a)

reactants

b)

products

c)

elements

d)

compounds

5.

The substances on the right side of the arrow in the chemical equation shown are called the

a)

products

b)

reactants

c)

elements

d)

compounds

6.
Which statement is not a description of a chemical reaction?
a)
A solid is dropped into a beaker of liquid and a gas is released.
b)
Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
c)
A solid is dropped into a beaker of liquid and an explosion occurs.
d)
A liquid is heated in the sun and half of it evaporates.
7.
In a chemical reaction
a)
The atoms of the reactants always stay together to form the products
b)
The atoms of the reactants unbond, rearrange, and then rebond to form the products
c)
New atoms are formed which combine to make the products
d)
Some atoms disappear while others multiply to form the products
8.
If the reactants on the left side of a chemical equation are C₃H₈ + 5O₂, the products in a balanced equation could be
a)
4CO₂ + 3H₂O
b)
3CO₂ + 4H₂O
c)
2CO₂ + 3H₂O
d)
3CO + 4H₂O
9.
In any chemical reaction, the mass of the products is always:
a)
slightly less than the mass of the reactants
b)
much less than the mass of the reactants
c)
the same as the mass of the reactants
d)
greater than the mass of the reactants
10.
How do chemical reactions turn substances into new substances?
a)
with burning acid
b)
the molecules mix together and create new substances
c)
the atoms break apart and combine back together in new ways
d)
the ionic compounds mix in water to form solutions
11.
What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
12.

In a reaction A + B --> C, there are 5g of reactant A and 9g of product C. How many grams of reactant B are there?

a)

4g

b)

5g

c)

9g

d)

14g

13.

In the reaction AB --> A + B, there are 12g of reactant AB and product 5g of product B. How many grams should there be of product A?

a)

17g

b)

2g

c)

7g

d)

None of the above

14.

Why does this picture demonstrate the Law of Conservation of Mass?

a)

the number of atoms of each element are the same on both sides

b)

they start out separate and end up combined

c)

the same elements are used

d)

it doesn't demonstrate the Law of Conservation of Mass

15.
10g of white powder reacts with 10g of clear liquid. The reaction bubbles and changes color producing a black liquid that has a mass of 13g. What can be concluded?
a)
5g of gas was produced
b)
This experiment violates the conservation of mass
c)
7g of gas was produced
d)
The excess reactant is destroyed & disappears during the reaction

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