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Chemical Reactions Review

Total questions: 30

Worksheet time: 38mins

Name
Class
Date
1.

What is underlined in the chemical equation below?

Na + Cl ---> NaCl

a)

Products

b)

Reactants

2.

In the chemical equation below, the product is....

Na + Cl ---> NaCl

a)

Na

b)

NaCL

c)

Cl

d)

NaCl

3.

Select all the Reactants

a)
b)
c)
4.
Substances that form as the result of a chemical reaction
a)
products
b)
reactants
c)
coefficients
d)
subscripts
5.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
6.

The reactants to photosynthesis are...

a)

glucose and oxygen

b)

carbon dioxide and water

7.

The products of photosynthesis are...

a)

glucose and oxygen

b)

carbon dioxide and water

8.
Plants take in ________from the air as one key ingredient for photosynthesis
a)
oxygen
b)
soil
c)
carbon dioxide
d)
sugar
9.
What gas  do plants give off after conducting photosynthesis that humans/animals need in order to live?
a)
Oxygen
b)
Carbon
c)
Nitrogen
d)
Hydrogen
10.

What is the process that combines glucose and oxygen to release energy?

a)

Cellular Respiration

b)

Photosynthesis

c)

Chemical Reaction

d)

Natural Selection

11.

The equation for combustion is: fuel + oxygen -->  water + ________ __________

a)

Carbon Dioxide

b)

Sodium Chloride

c)

Carbon Monoxide

d)

Magnesium Odixe

12.
Which of the following reactions is a combustion reaction ? 
a)
MgCO3 + O2 → MgO + CO2  
b)
C3H8 + 5O2 → 3CO2 + 4H2O 
c)
6CO2 + 6H2O → C6H12O6 + 6O2 
d)
6CO2 + 6H2O → C6H12O6 + 6O2 
13.
What is the law of Conservation of Mass?
a)
A measure of how much mass is created or destroyed. 
b)
Mass can neither be created nor destroyed during a chemical reaction. 
14.

Is this a physical or chemical change?

a)

Physical

b)

Chemical

15.

Bubbles form when water boils. Is this evidence of chemical change?

a)

Yes, because water is changing.

b)

Yes, because the water is reacting.

c)

No, because the vapor is still water.

d)

No, because water doesn't react with anything.

16.

This is an example of _____ change.

a)

Physical

b)

Chemical

17.

What type of change has occurred?

a)

Chemical

b)

Physical

18.
In a chemical equation, is it true that -
a)
the reactant side and product side can have different numbers of atoms for each element
b)
there can be different elements on the reactant side and the product side
c)
an element or compound must be accompanied by a phase change
d)
the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made
19.
Which of the following equations demonstrates an actual chemical reaction that forms a new substance? (HINT: it must follow the Law of Conservation of Mass)
a)
A
b)
B
c)
C
d)
D
20.
Is this balanced?
2HgO → 2Hg + O2
a)
Yes
b)
No
21.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
22.
When materials combine to form new compounds it is a chemical change. Which example is a chemical change?
a)

Alka-Seltzer fizzing

b)

water boiling

c)

ice melting

d)

sugar cube dissolving

23.

If reaction starts with 20g of reactants, it will produce ---

a)

a total of 40g of product

b)

a total of 10g of product

c)

a total of 80 g of product

d)

a total of 20g of product

24.

How many of each type of atom are in the formula NH3?

a)

1 nitrogen, 3 hydrogen

b)

3 nitrogen, 3 hydrogen

c)

1 neon, 3 hydrogen

d)

1 nitrogen, 3 helium

25.

In a reaction A + B ----> C.

Reactant A has 5g and product C has 9g.

How many grams does reactant B should have?

a)

4g

b)

5g

c)

9g

d)

14g

26.

What environmental element assists rusting?

a)

nitrogen

b)

oxygen

c)

carbon

d)

hydrogen

27.

What prevents Rusting

a)

Painting , Oiling , Galvinising

b)

Washing with water

28.

Which of the following molecules has the formula CH2O?

a)
b)
c)
d)
29.

How many different elements are in the formula CH3CH2Br?

a)

3

b)

5

c)

6

d)

2

30.

What is H2O?

a)

water

b)

Janice

c)

Yes

d)

HydrogenOxidium?

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