Free Printable Chemical reactions

1.

What type of reaction occurs in a hand warmer

a)

exothermic

b)

endothermic

2.

Exothermic reactions...

a)

Absorb energy

b)

Release energy

c)

Release Color

d)

Absorb Color

3.

In an endothermic reaction, heat is ...

a)

taken in or absorbed

b)

given out or released

4.

$O_2\left(g\right)\ +\ 2\ H_2\ \left(g\right)\ \rightarrow\ 2\ H_2O\ \left(g\right)\ +\ Energy$

a)

endothermic

b)

exothermic

5.

$6\ CO_2+\ 6\ H_2O\ +\ Energy\ \rightarrow\ C_6H_{12}O_6\ +\ 6\ O_2$

a)

endothermic reaction

b)

exothermic reaction

6.

A chemical reaction is...

a)

when a substance is mixed with another substance

b)

when a substance undergoes a change to form a new substance

c)

when a substance is dissolved into another substance

d)

when a substance is heated or exposed to another substance

7.

Translate the following word equation:
Liquid nitrogen and oxygen gas combine to form nitrogen monoxide gas.

a)

N + O → NO

b)

N₂ + O₂ → N₂O₂

c)

N_2(l)+ O_2(g) → NO_(g)

d)

N_(l) + O_2(g) → NO_(g)

8.

A precipitate is...

a)

a solid that falls out of a liquid solution

b)

a reactant in a reaction

c)

a clear substance

d)

the mass of a product

9.

The left side of a chemical equation is known as the _______

a)

Reactants

b)

Products

10.

What is a property in chemistry?

a)

A house

b)

A characteristic to describe something

c)

The total number of atoms

d)

Two atoms bonded together

11.

In an exothermic reaction, the products have more stored energ than the reactants

a)

True

b)

False

12.

According to the law of conservation of mass, matter cannot be created or (a)

13.

True or False: In a complete chemical equation, there must be the same number of atoms of each element on the reactants and products side.

a)

True

b)

False

14.

How many Oxygens are on the product side of this chemical equation?

a)

1

b)

2

c)

3

d)

4

15.

Why are chemical equations always balanced? Select ALL that apply.

a)

Matter cannot be created.

b)

Matter cannot be destroyed.

c)

Matter can only be rearranged/conserved.

d)

Matter doesn't matter.

Chemical reactions

Total questions: 15

Worksheet time: 17mins

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