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Chemical Reactions Test Review

Total questions: 43

Worksheet time: 27mins

Name
Class
Date
1.

What is an electron’s charge?

a)

positive

b)

negative

c)

no charge

2.

What is a proton’s charge?

a)

positive

b)

negative

c)

no charge

3.

What is a neutron’s charge?

a)

positive

b)

negative

c)

no charge

4.

Two of the same charges will ___.

a)

attract

b)

repel

5.

Two of the opposite charges will __.

a)

attract

b)

repel

6.

An electron and a proton will ___.

a)

attract

b)

repel

7.

The importance of a proton is that it determines the __ of the atom.

a)

identity

b)

together

c)

reactivity

8.

The importance of an electron is that it is responsible for the __ of the atom.

a)

identity

b)

together

c)

reactivity

9.

The importance of a neutron is that it holds the nucleus __.

a)

identity

b)

together

c)

reactivity

10.

Protons are found __.

a)

inside nucleus

b)

outside nucleus

11.

Electrons are found __.

a)

inside nucleus

b)

outside nucleus

12.

Neutrons are found __.

a)

inside nucleus

b)

outside nucleus

13.

made of only one type of atom

a)

mixture

b)

molecule

c)

element

14.

two or more atoms are chemically bonded together

a)

mixture

b)

molecule

c)

element

15.

different types of atoms or molecules that are mixed together but not bonded

a)

mixture

b)

molecule

c)

element

16.

the temperature at which a substance changes from a solid to a liquid

a)

substance

b)

melting point

c)

atoms

d)

property

e)

boiling point

17.

the temperature at which a substance changes from a liquid to a gas

a)

substance

b)

atoms

c)

melting point

d)

property

e)

boiling point

18.

something that is made of all the same atoms or groups of atoms

a)

substance

b)

atoms

c)

melting point

d)

property

e)

boiling point

19.

something that can be observed about a substance, such as color, smell, or boiling point

a)

substance

b)

atoms

c)

melting point

d)

property

e)

boiling point

20.

the tiny pieces that all matter – all the stuff in the world – is made of

a)

substance

b)

atoms

c)

melting point

d)

property

e)

boiling point

21.

a group of atoms joined together in a particular way

a)

scale

b)

extended structure

c)

model

d)

molecule

e)

subatomic particle

22.

a structure formed by repeating groups of atoms that link together in a large network

a)

scale

b)

extended structure

c)

model

d)

molecule

e)

subatomic particle

23.

an object, diagram, or computer program that helps us understand something by making it simpler or easier to understand

a)

scale

b)

extended structure

c)

model

d)

molecule

e)

subatomic particle

24.

the relative size of things

a)

scale

b)

extended structure

c)

model

d)

molecule

e)

subatomic particle

25.

a process in which atoms rearrange to form new substances

a)

chemical formula

b)

chemical reaction

c)

product

d)

reactant

26.

an ending substance that is made during a chemical reaction

a)

chemical formula

b)

chemical reaction

c)

product

d)

reactant

27.

a starting substance that is part of a chemical reaction

a)

chemical formula

b)

chemical reaction

c)

product

d)

reactant

28.

letters and numbers showing the types and number of atoms that repeat to make up a substance

a)

chemical formula

b)

chemical reaction

c)

product

d)

reactant

29.

During a chemical reaction, atoms stay the same type (a hydrogen at the beginning will be a hydrogen at the end)

a)

true

b)

false

30.

During a chemical reaction, atoms rearrange to form different groups of atoms

a)

true

b)

false

31.

During a chemical reaction, ALL of the atoms that make up the reactants rearrange to form the products.

a)

true

b)

false

32.

During a chemical reaction, some atoms may get destroyed.

a)

true

b)

false

33.

What is the missing letter?

4 (a)         +     O2     =     2K2O

34.

What is the missing element?

P4     +     3O2    =     2 (a)    2O3

35.

What is the missing element?

C (a)    4     +     2Br2     =     CBr4     +     2F2

36.

What is the missing element?

(a)         +     2HCl       =     ZnCl2    +    H2

37.

2Na     +     2H20       =     2 (a)    OH   +   H2

38.

What is the missing element?

2ZnS     +     3O2       =    2ZnO    +   2 (a)    O2

39.

What is the missing number?

(a)    Li     +     F2       =     2LiF

40.

What is the missing number?

C     +     H2O       =     CO    +    H (a)    

41.

What is the missing number?

(a)    K     +     2H2O       =     2KOH   +   H2

42.

What is the missing number?

2Ag2O     =     (a)    Ag   +   O2

43.

What is the missing number?

SnO2     +     2H2       =     Sn   +    (a)    H2O