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Understanding Chemistry test Review

Total questions: 37

Worksheet time: 37mins

Name
Class
Date
1.

How many of the following substances are elements?

 SS   N2O4N_2O_4   FeFe   O2O_2   LiFLiF   SrSr   AlAl  

a)

5

b)

3

c)

4

d)

6

2.

Define a physical change.

a)

A change to a substance that occurs without forming a new substance.

b)

A change in matter that produces one or more new substances.

c)

A change that undergoes a chemical reaction.

d)

None of the above.

3.

Define a chemical change.

a)

A change to a substance that occurs without forming a new substance.

b)

A change in matter that produces one or more new substances.

c)

A change that doesn't form something new.

d)

None of the above.

4.

Which of the following is NOT a compound?

a)

HClHCl

b)

NaClNaCl

c)

ClCl

d)

CO2CO_2

5.

Which of the following represents an element?

a)

H2OH_{2_{ }}O

b)

NaClNaCl

c)

H2H_2

d)

CaCO3CaCO_3

6.

What cannot be broken down into other substances?

a)

compound

b)

solids

c)

mixture

d)

element

7.

What is made up of two or more elements that are chemically combined?

a)

element

b)

mixture

c)

compound

d)

solid

8.

A pure substance containing only one type of atom is...

a)

element

b)

mixture

c)

compound

9.

A Lewis Dot diagram of Phosphorus (P) would show how many electrons?

a)

3

b)

5

c)

8

d)

15

10.

Which element belongs to the least reactive group of elements?

a)

Neon (Ne)

b)

Silver (Ag)

c)

Carbon (C)

d)

Potassium (K)

11.

Which subatomic particle determines the reactivity of a group of elements on the periodic table

a)

number of protons

b)

number of electrons

c)

number of neutrons

d)

number of valence electrons

12.

An element is identify by

a)

its number of neutrons

b)

its number of protons

c)

its atomic mass

d)

the type of charge

13.
Which of the following has a full valence shell?
a)
Oxygen
b)
Neon
c)
Barium
d)
Carbon
14.
An ionic bond forms when atoms ___________ electrons.
a)
gain
b)
share
c)
increase
d)
transfer
15.
Which type of bond has a transfer of an electron from on atom to another?
a)
Polar Covalent 
b)
Non Polar Covalent
c)
Ionic
d)
Metallic
16.
All chemical bonds involve two atoms sharing electrons.
a)
True
b)
False
17.
Chemical bonds form when atoms
a)
combined nuclei
b)
give up neutrons
c)
gain protons
d)
share or transfer electrons
18.
Bonds that form between two metals are called ______________ bonds.
a)
ionic 
b)
covalent
c)
metallic
d)
pervasive
19.
If an atom loses two electrons what charge will it have?
a)
+ 2
b)
 - 2
c)
+1
d)
-1
20.
If an atom gains one electron what charge will it have?
a)
-2
b)
-1
c)
+1
21.
Covalent compounds
a)
Share electrons
b)
transfer electrons
c)
contain a sea of electrons
d)
conduct electricity
22.
What is the number of valence electrons for Oxygen?
a)
8
b)
6
c)
2
d)
1
23.
How many valence electrons in this structure?
a)
6
b)
5
c)
4
d)
7
24.
Atoms joined together by SHARING electrons are?
a)
Ionic bonds
b)
Covalent bonds
c)
Metallic Bonds
d)
James Bonds
25.

The smallest part of an element that retains the properties of the element is the

a)

nucleus.

b)

electron

c)

atom

d)

neutron

26.

Which is the best example of a pure substance?

a)

pizza

b)

gold

c)

saltwater

d)

air

27.

Which substance is a compound?

a)

copper

b)

magnesium

c)

saltwater

d)

water

28.

What kind of substance is composed of two or more elements that are chemically combined?

a)

element

b)

mixture

c)

solution

d)

compound

29.

If a substance is composed of atoms arranged in one particular way, how is this substance best classified?

a)

element

b)

compound

c)

mixture

d)

solution

30.

A combination of substances that are not chemically combined is called a

a)

mixture

b)

compound

c)

element

31.

How are mixtures separated?

a)

Chemical changes

b)

Physical Changes

c)

Chemical Properties

d)

Physical Properties

32.

Earth’s air is made up of molecules of different gases that are not joined chemically. Which term best describes air?

a)

compound

b)

mixture

c)

pure substance

d)

element

33.

Brass is a metal that is bright red and gold. It is formed by combining, not chemically, two elements, zinc and copper. Based on the information, how would brass be classified?

a)

an element

b)

compound

c)

mixture

d)

suspension

34.

Which is the best example of a mixture?

a)

a brick of pure gold

b)

the distilled water in a bottle

c)

the salt water in the ocean

d)

the helium in a balloon

35.

Which term describes the substance that forms when two or more types of atoms join?

a)

element

b)

compound

c)

composite

d)

mixture

36.

Which of the following images best depicts the particles of an element?

a)

Picture 1

b)

Picture 2

c)

Picture 3

d)

Picture 4

37.

Structural differences between different chemicals can be represented in models of the particles. Which drawing BEST represents a compound?

a)

Picture A

b)

Picture B

c)

Picture C

d)

Picture D

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