Free Printable Matter Part 2 - Law of Conservation

1.

If an experiment is conducted, what can you predict the mass of the products to be?

a)

less than the mass of the reactants

b)

more than the mass of the reactants

c)

the same as the mass of the reactants

d)

the mass of the products is not measureable

2.

The Law of Conservation of Matter states,

a)

matter cannot be created, but can be destroyed

b)

matter can be created in a chemical reaction

c)

matter cannot be created unless a chemical reaction occurs

d)

matter cannon be created nor destroyed

3.

When is the Law of Conservation of Mass broken?

a)

during a reaction

b)

when a gas is formed

c)

never

d)

it depends on the experiment

4.

When conducting an experiment, David noticed his mass of the products is less than his mass of the reactants. Why could this be?

a)

the mass of the products will always be less

b)

he did not use a closed container/system to capture the gas matter

c)

the mass of the products will always be more

5.

When identifying a balanced equation,

a)

the number of molecules in the reactants should always be the same as the number of molecules in the products

b)

the number of atoms in the reactants should always be the same as the number of atoms in the products

c)

new elements should form

d)

the reactants should look the exact same as the products

6.

Balanced or Unbalanced: $2Na\ +\ H_2O\ \rightarrow\ NaOH\ +\ H_2$

a)

Balanced

b)

Unbalanced

c)

Not enough information

7.

Balanced or Unbalanced: $2Na\ +\ H_2O\ \rightarrow\ 2NaOH\ +\ H_2$

a)

Balanced

b)

Unbalanced

c)

Not enough information

8.

Balanced or Unbalanced: $2Na\ +\ H_2O\ \rightarrow\ 2NaOH\ +\ 2H_2$

a)

Balanced

b)

Unbalanced

c)

Not enough information

9.

Balanced or Unbalanced: $2Na\ +\ 2H_2O\ \rightarrow\ 2NaOH\ +\ H_2$

a)

Balanced

b)

Unbalanced

c)

Not enough information

10.

Which equation matches the picture?

a)

$2H_2\ +\ O_2\ \rightarrow\ 2H_2O$

b)

$H_2\ +\ O_2\ \rightarrow\ 2H_2O$

c)

$2H_2\ +\ 2O_2\ \rightarrow\ 2H_2O$

d)

$H_2\ +\ O_2\ \rightarrow\ H_2O$

11.

Water was heated in a beaker.

Mass of Reactants: 20.0 g

Mass of Products: 10.3 g

a)

The law of conservation was broken because the mass of the products decreased

b)

The law of conservation was not broken because the water was heated in an open container, letting the gas escape

c)

The law of conservation was not broken because the mass before heating was greater than the mass after heating

d)

The law of conservation was broken because the water was heated in an open container, letting the gas escape

12.

What happens to the mass of matter during a chemical reaction?

a)

mass is lost

b)

mass is gained

c)

mass is not lost or gained

d)

mass is both gained and lost

Matter Part 2 - Law of Conservation

Total questions: 12

Worksheet time: 6mins

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