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Unit 3 Chemical Reactions PreQuizizz

Total questions: 20

Worksheet time: 2hrs 31mins

Name
Class
Date
1.

What is the Law of Conservation of Mass?

a)

It states that matter cannot be created or destroyed.

b)

It states that energy cannot be created or destroyed.

c)

It states that matter can be created or destroyed.

d)

It states that sound can be created or destroyed.

2.
Which of the following equations are correctly balanced?
a)
12CO2 +H2O --> C6H12O6 + O2
b)
CO2 + 9H2O --> C6H12O6 + O2
c)
CO2 + H2O --> 3C6H12O6 + O2
d)
6CO2 + 6H2O --> C6H12O6 + 6O2
3.
How many Iron (Fe) atoms are in this chemical formula?
a)
2 iron atoms
b)
6 iron atoms
c)
5 iron atoms
d)
4 iron atoms
4.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
5.

The equation could be balanced by adding a number 2 in which location?

a)
A
b)
B
c)
C
d)
D
6.
In which of the following examples has a chemical reaction occurred?
a)
After putting liquid batter into a hot pan, the batter solidifies and begins to turn brown.
b)
After turning on a blender filled with fruits, the fruit is chopped up and mixed together.
c)
After taking a tray filled with ice cubes out of the freezer, the cubes begin to melt.
d)
After adding a spoonful of sugar to a mug of hot coffee, the sugar dissolves completely.
7.

In an experiment, two flasks of unknown, clear liquids are combined in a third beaker and the following are observed:

•Solution color remains clear.
•The amount of solution in the beaker increased.
•Solution temperature changed from 10°C to 20°C.
•Some of the liquid remained in the flasks.
How many of the listed observations indicate a new substance was formed?

a)
1
b)
2
c)
3
d)
4
8.
An experiment is performed in which a crystalline substance is added to a beaker filled with room temperature water. The following observations are made:
I. The crystals dissolve
II. A precipitate is formed.
III. The bottom of the beaker feels warm to the touch.
IV. Bubbles begin forming within the water.
All of the observations are evidence of a chemical change EXCEPT –
a)
observation I.
b)
observation II.
c)
observation III.
d)
observation IV.
9.
For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.
The student inferred that a chemical reaction occurred. What evidence supports this inference?
a)
A dark solid formed on the zinc metal.
b)

The zinc metal remained silver-colored and shiny
c)
The CuSO4 solution turned blue when the zinc metal was added.
d)
None of these
10.

How many atoms in all are in a molecule of serotonin?

C10H12N2O

a)
22
b)
24
c)
25
d)
4
11.

A scientist performed four investigations using eight different liquids. In each investigation, the scientist combined two of the liquids under a fume hood and recorded observations in the table below. In which investigation is it least likely that the liquids reacted chemically?

a)
1
b)
2
c)
3
d)
4
12.

How many Al atoms are in this compound? 4Al2O3

a)

2

b)

8

c)

6

d)

4

13.
Which of the following is NOT an example of chemical change?
a)
sour milk
b)
burning wood
c)
breaking a pencil
d)
rust
14.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
15.

C2H6 + 5O2 → 2CO2 + 3H2O2C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2  
Given this chemical equation, what are the PRODUCTS?

a)

C2H6 and 5O2C_2H_{6\ }and\ 5O_2  

b)

2CO2 and 3H2O22CO_2\ and\ 3H_2O_2  

16.
Which of the following examples shows that a chemical reaction has occurred? 
a)
A rock breaks into smaller pieces when it is struck with a hammer.
b)
Rust forms on a hammer that has been left outside to long. 
c)

Water turns pink when a few drops of red food coloring are added.

d)
A solid is formed when heat is removed from a sample of water. 
17.
When vinegar and baking soda are combined, bubbles begin to form.  Bubbles are evidence of a chemical reaction because they - 
a)
pop when they are touched.
b)
show that a gas is forming.
c)
form at a fast rate.
d)
are generally transparent.
18.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid. 
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
19.

How many atoms are represented in the reactants of this equation?

a)

18

b)

24

c)

36

d)

72

20.

Count the number of Nitrogen atoms in 4NH4NO3

a)

2

b)

4

c)

8

d)

16

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