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Lesson 25 classwork: Law of Conservation of Mass

Total questions: 40

Worksheet time: 20mins

Name
Class
Date
1.

Which of the following will allow measurement of a solid's mass with the greatest precision?

a)

500 gram scale measuring in 1 gram increments

b)

250 gram scale measuring in 0.5 gram increments

c)

300 gram scale measuring in 0.1 gram increments

d)

200 gram scale measuring in 0.2 gram increments

2.

N2 + 3H2 → 2NH3

Which of the following statements accurately describes the reaction shown above?

a)

The mass of the hydrogen gas plus the nitrogen gas is less than the mass of the ammonia.

b)

The mass of the hydrogen gas is equal to the nitrogen gas plus the mass of the ammonia

c)

The mass of the hydrogen gas minus the nitrogen gas is equal to the mass of the ammonia

d)

The mass of the hydrogen gas plus the nitrogen gas is equal to the mass of the ammonia

3.

Write how many of each substance are present after the coefficient has been added:


2N2S4 = ____N + ____S

a)

2,4

b)

4,8

c)

4,6

d)

1,2

4.

Write how many of each substance are present after the coefficient has been added:


4CBr4 = ____C + ____Br

a)

4,4

b)

1,4

c)

4,16

d)

4,1

5.

Write how many of each substance are present after the coefficient has been added:


2AlBr3 = ____Al + ____Br

a)

2,6

b)

1,3

c)

2,5

d)

6,2

6.

Write how many of each substance are present after the coefficient has been added:


SiS2 = ____ Si + ____ S

a)

0,2

b)

1,1

c)

2,2

d)

1,2

7.

Write how many of each substance are present after the coefficient has been added:


2MgCl2 = ____ Mg + ____ Cl

a)

1,2

b)

2,2

c)

0,2

d)

2,4

8.

Write how many of each substance are present after the coefficient has been added:


3KF = ____K + ____F

a)

1,1

b)

3,3

c)

3,1

d)

0,0

9.

Write how many of each substance are present after the coefficient has been added:


3MnO2 = ____Mn + ____O

a)

3,6

b)

1,2

c)

3,2

d)

0,2

10.

Write how many of each substance are present after the coefficient has been added:


3BaCl2 = ____Ba + ____Cl

a)

1,2

b)

3,2

c)

3,5

d)

3,6

11.

Write how many of each substance are present after the coefficient has been added:


4CO = ____C + ____O

a)

4,4

b)

0,0

c)

4,1

d)

1,4

12.

Write how many of each substance are present after the coefficient has been added:


2CaCl2 = ____Ca + ____Cl

a)

1,2

b)

0,2

c)

2,4

d)

2,2

13.

Write how many of each substance are present after the coefficient has been added:


3H2 = ____H

a)

2

b)

5

c)

3

d)

6

14.

Write how many of each substance are present after the coefficient has been added:


3H2O = ____H + ____O

a)

6,3

b)

5,3

c)

2,0

d)

6,0

15.

Write how many of each substance are present after the coefficient has been added:


2Mg(NO2)2 = ____Mg + ____NO2

a)

2,4

b)

2,6

c)

1,4

d)

0,4

16.

Write how many of each substance are present after the coefficient has been added:


2NH4Cl = ____NH4 + ____Cl

a)

8,2

b)

6,1

c)

2,2

d)

4,1

17.

Write how many of each substance are present after the coefficient has been added:


3Na3PO4 = ____Na + ____PO4

a)

9,12

b)

3,4

c)

9,3

d)

6,7

18.

Write how many of each substance are present after the coefficient has been added:


3K2SO4 = ____K + ____SO4

a)

5,7

b)

6,3

c)

6,12

d)

6,7

19.

Write how many of each substance are present after the coefficient has been added:


3Pb(SO4)2 = ____Pb + ____SO4

a)

3,6

b)

1,12

c)

4,5

d)

0,6

20.

Write how many of each substance are present after the coefficient has been added:


2NaOH = ____Na + ____OH

a)

1,1

b)

0,2

c)

2,4

d)

2,2

21.

Write how many of each substance are present after the coefficient has been added:


2Al2(CO3)3 = ____Al + ____CO3

a)

4,9

b)

4,6

c)

2,5

d)

4,8

22.

Write how many of each substance are present after the coefficient has been added:


3Ca(OH)2 = ____Ca + ____OH

a)

2,5

b)

3,5

c)

1,2

d)

3,6

23.

Solve for the unknown mass:


3g + ?g = 9.5g

a)

7

b)

5.5

c)

6

d)

6.5

24.

Solve for the unknown mass:


3.1g +8.2g = ?g

a)

11.3

b)

10.3

c)

9.0

d)

11.0

25.

Solve for the unknown mass:


4g + ?g = 12.4g

a)

6.4

b)

9

c)

8.4

d)

7

26.

Solve for the unknown mass:


8.2 + 17.3 = ?g

a)

25.5

b)

24.3

c)

26

d)

26.2

27.

Solve for the unknown mass:


2g + ?g = 8.3g

a)

6

b)

5.3

c)

7.1

d)

6.3

28.

Solve for the unknown mass:


5.1g + 3.8g = ?g

a)

9

b)

8.8

c)

8.9

d)

8

29.

Solve for the unknown mass:


6.7g + ?g = 9.4g

a)

2

b)

2.5

c)

3

d)

2.7

30.

Solve for the unknown mass:


18.3g + 9.2g = ?g

a)

27.5

b)

25

c)

27.3

d)

28.2

31.

Solve for the unknown mass:


3.2g + ?g = 7.4g + 4.5g

a)

5.5

b)

1.3

c)

4.2

d)

8.7

32.

Solve for the unknown mass:


5.1g + 3.8g = ?g + 6.3g

a)

3.1

b)

2.2

c)

4.9

d)

2.6

33.

Solve for the unknown mass:


6.7g + ?g = 9.4g + 10.7g

a)

13.4

b)

12.2

c)

13

d)

15.7

34.

hydrogen + oxygen → water

8g + 64g → ?g


8 grams of hydrogen reacts with 64 grams of oxygen. Assuming all of the reactants are used up, how much water will be produced?

a)

72g

b)

56g

c)

64g

d)

144g

35.

S8 + 8O2 → 8SO2

If 64g of sulfur reacts with 4g of oxygen gas, what will be the mass of the sulfur dioxide produced?

a)

60g

b)

64g

c)

68g

d)

48g

36.

2Cu + O2 → 2CuO


When 63.5g of copper reacts with 16.0g of oxygen gas to form copper (II) oxide, no copper or oxygen is left over. How much copper (II) oxide is produced?

a)

3.97g

b)

47.5g

c)

79.5g

d)

143g

37.

mercury(II) oxide → oxygen + mercury

30.0g → 2.1g + ?g


According to the law of conservation of mass, how much mercury was present in the mercury (II) oxide?

a)

30g

b)

32.1g

c)

27.9g

d)

63g

38.

CaCl2 + Na2CO3 → CaCO3 + NaCl


What coefficient values will ballance the reaction shown above?

a)

2,1,2,1

b)

1,1,1,1

c)

1,1,1,2

d)

1,2,1,1

39.

C6H12O6 + O2 → CO2 + H2O

a)

1,6,6,6

b)

2,6,6,6

c)

1,3,3,3

d)

2,6,3,6

40.

H2O + Li → LiOH + H2


What coefficient values will balance the reaction shown above?

a)

2,1,2,1

b)

2,2,1,1

c)

2,1,2,2

d)

2,2,2,1

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