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Unit 2 Exam Review

Total questions: 58

Worksheet time: 2hrs 47mins

Name
Class
Date
1.

Calculate the number of Oxygen atoms in Al(OH)₃.

a)

1

b)

2

c)

3

d)

4

2.

The 3 in the above formula is called a _____________.

a)

A coefficient

b)

B subscript

c)

C superscript

d)

D mininumber

3.

Which of the following is the correct count for 4CF₂Cl₂?

a)

C=4, F=2, Cl=8

b)

C=1, F=2, Cl=2

c)

C=4, F=4, Cl=4

d)

C=4, F=8, Cl=8

4.

Coefficients in chemical formulas

a)

A Multiply only what is in parenthesis

b)

B Multiply everything

c)

C add to the subscripts if it has them

d)

D do nothing

5.

How many TOTAL atoms are in C₂H₈O?

a)

11

b)

2

c)

8

d)

1

6.

How many Hydrogen atoms are in 4H2O?

a)

A 6

b)

B 2

c)

C 4

d)

D 8

7.

How many Hydrogen atoms are in (NH4)3CrO4?

a)

A 3

b)

B 12

c)

C 4

d)

D 7

8.

How many Nitrogen atoms are in (NH4)3CrO4?

a)

A 3

b)

B 12

c)

C 4

d)

D 7

9.

How many Oxygen atoms are in 2Al2(SO4)3?

a)

A 2

b)

B 4

c)

C 24

d)

D 6

10.

How many Sulfur atoms are in 2Al2(SO4)3?

a)

A 2

b)

B 3

c)

C 12

d)

D 6

11.

How many Aluminum atoms are in 2Al2(SO4)3?

a)

A 2

b)

B 4

c)

C 6

d)

D 12

12.

What is the correct number of atoms in H2SO4?

a)

H=2, S=4, O=4

b)

H=2, S=4, O=1

c)

H=2, S=1, O=4

d)

H=8, S=4, O=4

13.

How many magnesiums are in 10MgCl2?

a)

10

b)

20

c)

2

d)

12

14.

Calculate the number of Aluminums in Al(OH)3?

a)

1

b)

2

c)

3

d)

4

15.

How many TOTAL atoms are in 4K2CO3?

a)

4

b)

20

c)

12

d)

24

16.

Examine the diagram showing the periodic table divided into two regions. Select the phrase that identifies where metals are found on the periodic table.

a)

on the left and right sides of

b)

on the right side of

c)

on the left side of

d)

only touching the staircase on the periodic table.

17.

These types of elements are semiconductors.

a)

nonmetals

b)

metalloids

c)

metals

18.

Osmium is a...

a)

nonmetal

b)

metal

c)

not an element

d)

metalloid

19.

Which of the following are properties of nonmetals?

a)

ductile

b)

dull

c)

good insulators

d)

brittle

e)

shiny

20.

__________ make up 75% of the periodic table.

a)

metalloids

b)

nonmetals

c)

metals

21.

Which property of elements is defined by the ability to be hammered into sheets?

a)

ductility

b)

malleability

c)

conductivity

d)

luster

22.

Which table shows accurate information about elements on the periodic table?

a)

A

b)

B

c)

C

d)

D

23.

Based on the periodic table, how many protons are found in an atom of iron (Fe)?

a)

8

b)

26

c)

30

d)

56

24.

Which set of elements have chemical properties similar to those of phosphorus?

a)

nitrogen, arsenic, and antimony

b)

carbon, selenium, and iodine

c)

silicon, sulfur, and germanium

d)

silicon, sulfur, and chlorine

25.

Sodium, Na, is in the same period as

a)

S

b)

K

c)

Kr

d)

Rb

26.

According to the periodic table, argon is found in what group?

a)

1 (1A)

b)

2 (2A)

c)

16 (6A)

d)

18 (8A)

27.

Which describes the subatomic particles of a neutral helium atom?

a)

four protons, four neutrons, and four electrons

b)

two protons, four neutrons, and two electrons

c)

four protons, two neutrons, and two electrons

d)

two protons, two neutrons, and two electrons

28.

What is the mass of an atom that has 6 protons, 7 neutrons, and 6 electrons?

a)

13 amu

b)

12 amu

c)

14 amu

d)

15 amu

29.

Where are electrons located in an atom?

a)

with the quarks

b)

with the neutrons

c)

outside the nucleus

d)

near the protons

30.

What year were the latest 4 elements added to the periodic table?

a)

2016

b)

2012

c)

2018

d)

2020

31.

What type of elements border the “stair step” or “zigzag line”?

a)

metals

b)

nonmetals

c)

metalloids

d)

solids

32.

Krypton (Kr) is a colorless gas that does not conduct electricity. Where would you find this element on the Periodic Table?

a)

on the left

b)

on the right

c)

in the middle

d)

at the bottom

33.

What is a semiconductor?

a)

an element that conducts electricity

b)

an element that conducts electricity only under certain conditions

c)

an element that does not conduct electricity

d)

an element that barely conducts electricity

34.

Aluminum is an element that is used to make soda cans and sheet metal for airplanes. What property of aluminum makes it useful in this way?

a)

Aluminum is a conductor

b)

Aluminum is ductile

c)

Aluminum is malleable

d)

Aluminum has a high melting point

35.

True or False: There are only about 65 known elements.

a)

True

b)

False

c)

Maybe

d)

I don't know

36.

The majority of the elements on the Periodic Table are

a)

metals

b)

nonmetals

c)

metalloids

d)

solids

37.

Copper is used as wiring in many homes because it is a _________ metal.

a)

malleable

b)

ductile

c)

conductive

d)

insulated

38.

Sodium (Na) is a silvery metallic element with an extremely high melting point. This element is a __________ and will be found on the __________ side of the Periodic Table.

a)

nonmetal, right

b)

metal, right

c)

nonmetal, left

d)

metal, left

39.

The ________ make up the smallest group on the Periodic Table.

a)

metals

b)

nonmetals

c)

metalloids

d)

solids

40.

What kind of elements have characteristics of both metals and nonmetals?

a)

metals

b)

nonmetals

c)

metalloids

d)

megametals

41.
Which element has a full valence shell?
a)
F
b)
D
c)
C
d)
E
42.

Which element has 3 valence electrons?

a)

A

b)

B

c)

E

d)

C

43.
Which elements have the same number of valence electrons?
a)
A & C
b)
E & C
c)
F & A
d)
F & B
44.
Which elements are in the same period?
a)
A & F
b)
F, B & D
c)
E & D
d)
F & B
45.
Is silicon a metal, nonmetal or metalloid?
a)
Metal
b)
NonMetal
c)
Metalloid
46.
Is this a metal, nonmetal or metalloid?
a)
Metal
b)
Nonmetal
c)
Metalloid
47.

To which group does this atom belong based on valence electrons?

a)

1

b)

3

c)

13

d)

11

48.

I am a nonmetal


I am in period 2


I am in group 16/6A

a)

Ba

b)

Si

c)

Br

d)

O

49.

How many different elements are present in H2COCH2

a)

5

b)

4

c)

3

d)

2

50.

The ______ are numbers found on the lower right-hand side of an element symbol.

a)

Coefficient

b)

Exponent

c)

Multiplier

d)

Subscript

51.

Coefficients in chemical formulas...

a)

Multiply just the first atom

b)

Add to the subscripts at the end of the molecule

c)

Multiply elements without subscripts

d)

Multiply EVERYTHING!

52.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
53.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
54.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
55.

How many Hydrogen atoms in 3(NH₄)₂CrO₄?

a)

4

b)

2

c)

8

d)

24

56.

How many Hydrogen atoms in 3(NH₄)₂CrO₄?

a)

4

b)

2

c)

8

d)

24

57.

How many elements are present in this compound? (Careful!)

Mg2As3COHNi2

a)

2

b)

4

c)

6

d)

10

58.

A period tells you the number of

a)

electrons

b)

protons

c)

valence electrons

d)

energy levels

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