wayground logo

Free Printable Worksheets

NEW

Font size

S
M
L
XL
Worksheets

Conservation of Mass

Total questions: 20

Worksheet time: 3600secs

Name
Class
Date
1.

The formation of an ionic bond involves the

a)

sharing of neutrons.

b)

transfer of electrons.

c)

sharing of protons

d)

sharing of neutrons.

2.

Which part of an atom creates MOST of the atom’s volume?

a)

Nucleus

b)

Proton

c)

Neutron

d)

Electron

3.

Charged particles formed during a chemical reaction are

a)

Ions

b)

Protons

c)

Molecules

d)

Neutrons

4.

Examine the following chemical equation:

Mg + S → MgS

a)

Two atoms combine to form one atom.

b)

Two atoms combine to form one molecule

c)

Two elements combine to form a different element

d)

Two elements combine to form two new elements

5.

What change has taken place in the following?

K → Kᐩ

a)

loss of a proton

b)

gain of a proton

c)

loss of an electron

d)

gain of an electron

6.

A bond is formed when an electron is transferred from a sodium atom to a chlorine atom. What happens to the sodium atom during this process?

a)

The mass of the atom increases

b)

The atom becomes an isotope

c)

The atomic number decreases

d)

The atom become a positive ion

7.

An atom becomes an ion with a ⁻1 charge because the atom

a)

gains one electron

b)

loses one electron

c)

gains one proton

d)

loses one proton

8.

If 100 grams of vinegar and 5 grams of baking soda are poured in a container, a small amount of gas will be produced. What will the final mass of the products be if the gas is trapped in the container?

a)

100 grams

b)

104 grams

c)

105 grams

d)

110 grams

9.

A scientist studies the following chemical equation for the production of water.

2H₂ + O₂ → 2H₂O

a)

mass of oxygen stays the same

b)

mass of the hydrogen doubles

c)

mass of oxygen decreases

d)

mass of hydrogen increases

10.

The chemical equation below shows the amount of the reactants used and the amount of only one of the products formed.

Mass (g)

CH4 (4 g) + 2O2 (16 g) → CO2 (11g) + 2H2O (?)

a)

5 g

b)

9 g

c)

27 g

d)

31 g

11.

use the process of photosynthesis to convert carbon dioxide and water into glucose and oxygen.


6CO2 + 6H2O → C6H12O6 + 6O2

Carbon Water Glucose Oxygen

Dioxide


If a plant uses 44 grams of carbon dioxide and 18 grams of water to produce 32 grams of oxygen, how many grams of glucose are produced for the plant to use?

a)

26 grams

b)

30 grams

c)

62 grams

d)

94 grams

12.

The diagram shows a chemical reaction that occurs between hydrogen and oxygen.

Which scientific law is BEST demonstrated by the reaction shown in the diagram?

a)

law of angular momentum

b)

law of universal gravitation

c)

law of conservation of mass

d)

law of conservation of energy

13.

Hydrogen and nitrogen react to produce ammonia gas as shown in the following chemical equation.

N₂ + 3H₂ → 2NH₃

25.9g + ? → 31.5g

a)

5.60 g

b)

3.73 g

c)

2.49 g

d)

1.64 g

14.

What is the coefficient for iodide ions (I⁻) when the equation is balanced?

__ Cu+2 + __I- → __CuI + __I2

a)

1

b)

2

c)

3

d)

4

15.

When magnesium is burned in the presence of oxygen, it produces magnesium oxide according to the following chemical equation.

2Mg + O₂ → 2MgO

3.45g + 2.27g → ?

a)

8.69 g

b)

5.72 g

c)

4.35 g

d)

3.45 g

16.

The chemical equation shows the production of magnesium chloride.

Mg + 2HCl → MgCl2 + H2


12g + 36g → 47g + ?

a)

1.0 g

b)

2.0 g

c)

3.0 g

d)

4.0 g

17.

Which of the following is the balanced chemical equation that represents the chemical reaction of potassium and oxygen to produce potassium oxide?

a)

K + O → KO

b)

4K + O2 → 2K2O

c)

2K + O → K2O

d)

2K + 2O → K2O2

18.

An aerobic cellular respiration, glucose (C6H12O6) is broken down in a series of reactions to produce carbon dioxide (CO2) and water (H2O). These reactions provide the energy necessary for the production of energy in the form of 36 ATP molecules.


C6H12O6 + 6O2 → 6CO2 + H2O + energy (36 ATP)


The law of conservation of mass is correctly demonstrated in which statement about the process of cellular respiration?

a)

The mass of glucose is equal to the total mass of the water molecules

b)

The mass of glucose is conserved in the mass of the ATP in the products

c)

The total mass of oxygen is conserved in the total mass of carbon dioxide produced

d)

The total mass of glucose and oxygen is equal to the total mass of carbon dioxide and water.

19.

Which equation for the complete combustion of propane (C3H8) is correctly balanced?

a)

C3H8 + 3O2 → 2CO2 + 4H2

b)

C3H8 + 7O2 → 3CO2 + 4H2O

c)

2C3H8 + 10O2 → 6CO2 + 8H2O

d)

C3H8 + 5O2 → 3CO2 + 4H2O

20.

The equation is NOT balanced


___ CH4 + ___ O2 → CO2 + ___ H2O

a)

2, 2, 1, 4

b)

1,1,1,2

c)

1,2,1,2

d)

0,3,2,2