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Chemical equations

Total questions: 43

Worksheet time: 55mins

Name
Class
Date
1.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
2.
How many atoms of carbon (C) are in  C6H12O6?
a)
3
b)
6
c)
12
d)
24
3.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
4.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
5.
What is the Law of Conservation of Mass?
a)
It states that no matter can be created or destroyed.
b)
It states that no energy can be created or destroyed.
c)
It states that matter can be created or destroyed.
d)
It states that no sound can be created or destroyed.
6.
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
7.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
8.
Chemical reactions occur when _________ are broken and new bonds are formed.
a)
mixtures
b)
osteoclasts
c)
physical bonds
d)
chemical bonds
9.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
10.
Balance this equation...
H2 + Cl2 --> HCl
a)
It is balanced 
b)
3H2 + Cl2 --> 6H2Cl
c)
H2 + Cl2 --> 2HCl
11.

Which are the reactants in the following reaction?

2Mg + O2 ---> 2MgO

a)

Mg and O2

b)

MgO

c)

Mg and MgO

d)

O2 and MgO

12.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
13.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

14.

If a chemical reaction is EXOTHERMIC, the temperature of the surrounding would....

a)

Stay the same

b)

Increase

c)

Decrease

15.

The illustration shows cell respiration. Is the overall reaction of cell respiration an Endothermic or an Exothermic reaction?

a)

Endothermic

b)

Exothermic

16.

Baking bread and cooking an egg require an input of heat. These would be examples of....?

a)

Endothermic processes

b)

Exothermic processess

c)

None of these

17.

Photosynthesis takes place inside of leaf cells. Sunlight is required. Is this an Exothermic or an Endothermic reaction?

a)

Endothermic

b)

Exothermic

18.
What type of reaction is shown in the photo?
a)
Exothermic
b)
Isothermic
c)
Endothermic
d)
None of the  above
19.

What type of reaction is this?

a)

Exothermic

b)

Endothermic

c)

Energy Producing

d)

No way to tell

20.

How many grams of OXYGEN would be needed to show conservation of mass in the example below?

a)

100 g

b)

93 g

c)

7 g

d)

0 g

21.

How many grams of coal were present at the start of the chemical change?

a)

Unknown

b)

100 g

c)

200 g

d)

50 g

22.

How many grams of CHOCOLATE POWDER are shown in the example of conservation of mass below?

a)

450 g

b)

465 g

c)

0 g

d)

15 g

23.

How many grams of LIQUID WATER are shown in the example of conservation of mass?

a)

0 g

b)

50 g

c)

100 g

d)

200 g

24.

How many grams of SLICED APPLE are shown in the example of conservation of mass?

a)

230 g

b)

235 g

c)

115 g

d)

0 g

25.

How many kilograms of SMOKE are shown in the example of conservation of mass?

a)

1 kg

b)

30 kg

c)

28 kg

d)

3 kg

26.

True or False: This picture shows that during most chemical reactions the amount of mass in system stays the same?

a)

True

b)

False

27.

A student mixes 125 grams of sugar, 250 grams of water and 5 grams of flavoring. The solution weighs...

a)

250 grams

b)

380 grams

c)

375 grams

d)

400 grams

28.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
29.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
30.

Balance this equation, CaCO3(s) → CaO(s) + CO2(g)?

a)

3,1,2

b)

1,1,1

c)

1,3,1

d)

2,6,3

31.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
32.
Which number should go in the blank?
2 Na+ _ Cl2 -> 2 NaCl
a)
1
b)
2
c)
3
d)
0
33.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
34.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
35.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
36.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
37.

In the chemical equation H2O2(ag) → H2O(l) + O2(g), the O2 is a

a)

reactants

b)

yield

c)

products

d)

solid

38.

Which symbol shows a chemical reaction has occured?

a)

A

b)

B

c)

C

d)

D

39.

In a chemical reaction...

a)

New atoms are created

b)

Atoms rearrange

c)

Atoms are destroyed

d)

Nothing Happens

40.

How many Nitrogen (N) atoms are in 4NH3?

a)

4

b)

1

c)

3

d)

12

41.

The graph above is from which type of reaction?

a)

Endothermic reaction

b)

Exothermic reaction

42.

The graph above is from which type of reaction?

a)

Endothermic reaction

b)

Exothermic Reaction

43.
Which letter corresponds to the energy of the products?
a)
A
b)
B
c)
C
d)
D

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