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Chemistry Topic 4 Chemical Reactions Quiz

Total questions: 27

Worksheet time: 54mins

Name
Class
Date
1.
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)
A cup of 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. 
2.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
3.

Which of the following is an example of an endothermic reaction?

a)

lighting a sparkler

b)

breaking a cold pack

c)

cellular respiration

d)

baking bread

4.

One evidence of a chemical change is the formation of a precipitate. A precipitate is formed when

a)

Two liquids react and a gas is produced

b)

A solid dissolves in a liquid

c)

One liquid dissolves in another

d)

Two liquids react and a solid is formed

5.
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.
6.

Which of the following is located on the left side of a chemical reaction?

a)

reactants

b)

products

7.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
8.

Why does a higher concentration increase the rate of reaction?

a)

it increases the amount of reactants

b)

it lowers the activation energy

c)

it increases the energy of particle collisions

d)

it increases the frequency of particle collisions

9.
Evidence of a chemical reactions is anything that shows - 
a)
a new substance has formed
b)
a solid dissolved in a liquid
c)
interaction between 2 gases
d)
a change in the state of matter
10.
Which of the following slows down the rate of a chemical reaction?
a)
Place the reactants in hot water
b)
Place the products in ice bath
c)
Place the reactants in a ice bath
d)
Keep stirring the reactants with a stirring rod
11.
Some chemical reactions require a substance called a catalyst. The main purpose of a catalyst is
a)
To warm up the reaction
b)
To speed up the reaction
c)
To create more reactants
d)
To stop the reaction
12.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy or reaction

b)

by giving them more energy

c)

by making them more available

13.

The Law of Conservation of Mass states:

a)

Mass can created or destroyed.

b)

Mass cannot be created or destroyed.

c)

Mass can't be created.

d)

Mass can't be destroyed.

14.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
15.

The following shows a chemical reaction of a sparker:


magnesium + oxygen --> magnesium oxide


If 5 grams of magnesium burns to produce 8 grams of magnesium oxide, how many grams of oxygen is used in the reaction?

a)

3g

b)

5g

c)

8g

d)

13g

16.
What is the rate of reaction?
a)
How fast a reaction is 
b)
How big a reaction is
c)
How loud a reaction is
d)
How much gas a reaction produces
17.
What types of systems are there?
a)
Mechanical and Electrical Systems
b)
Inside and Outside Systems
c)
Open and Closed Systems
d)
Human and Machine Systems
18.
Since gasses weigh nothing, when they are produced in a reaction they do not have to be accounted for.  
a)
True
b)
False
19.
Oxygen must be present for what kind of reaction to occur?
a)
Synthesis
b)
Decomposition
c)
Combustion
d)
None of the above
20.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
21.
Which of the following is NOT evidence that that a chemical reaction has occurred?
a)
produces light/heat
b)
production of a gas
c)
formation of a precipitate
d)
melting
22.
Which of the following equations demonstrates an actual chemical reaction that forms a new substance?
a)
A
b)
B
c)
C
d)
D
23.

Two clear colorless solutions were combined.

The student observed that the temperature changed from 25 •C to 23 •C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. Which statements are true about the reaction? (Check all that apply)

a)

A gas was released

b)

an endothermic reaction

c)

an exothermic reaction

d)

precipitate formed

e)

change in color

24.

The combination of baking soda ions (HCO3-2) and acetic acid (HC2H3O2) forms water and carbon dioxide. What is the correct word equation for this reaction?

a)

baking soda 🡪 water + carbon dioxide

b)

acetic acid + water 🡪 carbon dioxide

c)

baking soda + acetic acid 🡪 water + carbon dioxide

d)

acetic acid 🡪 water + carbon dioxide

25.

In your first trial of a reaction, you used cold acetic acid and small chunks of baking soda. The reaction took 30 s to complete. Which of the following suggestions would NOT increase the rate of the reaction?

a)

Use a different container

b)

Increase the temperature of acetic acid

c)

Crush the baking soda

d)

Increase the concentration of the acetic acid

26.

What is an enzyme?

a)

a substance that acts as a catalyst in non-living organisms.

b)

a substance that slows the rate of reactions.

c)

a substance that produces a precipitate in reactions.

d)

a substance that acts as a catalyst in living organisms

27.

Which of the following chemical reactions do not require oxygen as a reactant?

a)

combustion

b)

photosynthesis

c)

cellular respiration

d)

corrosion

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