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Counting Atoms 8.5D

Total questions: 40

Worksheet time: 32mins

Name
Class
Date
1.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
2.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
3.
The number of Na's in Na₂CO₃
a)
1
b)
2
c)
3
d)
6
4.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
5.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
6.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
7.
How many Nitrogen are in 2AlN?
a)
4
b)
5
c)
1
d)
2
8.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
9.
How many atoms of Hydrogen are in this compound
a)
1
b)
2
c)
3
d)
4
10.
A subscript is the small number below a(n) ________ that tells the number of _______ of that element.
a)
element symbol; atoms
b)
atom; element symbol
c)
subscript; protons
d)
compound; elements
11.
In this compound structure of alcohol, how many Hydrogen atoms are there?
a)
2
b)
4
c)
6
d)
8
12.
Is this an example of an organic or inorganic compound?
a)
Organic
b)
Inorganic
13.
A pure substance that cannot be broken down into simpler substances.
a)
element
b)
compound
c)
molecule
d)
carbon dioxide
14.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
15.
A subscript is the small number below a(n) ________ that tells the number of _______ of that element.
a)
element symbol; atoms
b)
atom; element symbol
c)
subscript; protons
d)
compound; elements
16.

How many atoms of each element are in NaCl?

a)

Na=1, Cl=1

b)

Na=2. Cl=2

c)

Na=1, Cl-2

17.

C12H22O11 has how many carbon atoms?

a)

1

b)

11

c)

12

d)

45

18.

4 NaCl represents several molecules of table salt. How many atoms of chlorine are present in this example?

a)

1

b)

4

c)

8

19.

5 N2O represents the laughing gas you might have at the dentist. How many atoms of nitrogen are present here?

a)

1

b)

2

c)

7

d)

10

20.

We used baking soda before in a chemical reaction. How many molecules of it are represented here? 3 NaHCO3

a)

1

b)

3

c)

4

21.

2 H2O gives us life! How many total atoms are represented here?

a)

2

b)

4

c)

6

22.

How many elements are in: 4 NaCl (salt)

a)

1

b)

2

c)

4

d)

8

23.

How many elements are present in hydrochloric acid (HCl)?

a)

1

b)

2

c)

3

24.

Caffeine is represented here: C8H10N4O2 ... How many atoms are present?

a)

4

b)

18

c)

24

d)

32

25.

C8H10N4O2 has how many elements?

a)

24

b)

4

c)

1

26.

C8H10N4O2 has how many hydrogens?

a)

1

b)

2

c)

4

d)

10

27.

What is an ELEMENT?

a)

When you go to grade school

b)

A bunch of DIFFERENT kinds of atoms

c)

A single atom or group of atoms of the SAME kind

28.

A SUBSCRIPT IS...

a)

Number to the left of the element symbol

b)

Number to the right of the element symbol

c)

the scientific name for a group of atoms

d)

A substance made of only one kind of atom

29.

A Coefficient tells you ....

a)

how many of that atom there is

b)

the atomic mass

c)

how many of that molecule there are

d)

where the element is found on the periodic table

30.

Is this a picture of an ATOM, a MOLECULE, COMPOUND and/or an ELEMENT? (check ALL that apply!)

a)

ATOM

b)

MOLECULE

c)

ELEMENT

d)

COMPOUND

31.
How many atoms of Oxygen are in Fe(NO3)3 ?
a)
6
b)
3
c)
9
d)
1
32.
How many atoms of barium are in Ba3(PO4)2 ?
a)
4
b)
8
c)
3
d)
2
33.
How many atoms of oxygen are in Ba3(PO4)2 ?
a)
4
b)
2
c)
6
d)
8
34.
How many atoms of phosphorus are in Ba3(PO4)2 ?
a)
3
b)
2
c)
8
d)
4
35.
How many electrons need to be in the outer electron level to be stable?
a)
8
b)
2
c)
18
d)
6
36.
Noble gases form compounds
a)
True
b)
False
37.
How many atoms of Sulfur are in Mn2(SO4)3 ?
a)
3
b)
4
c)
12
d)
2
38.
How many atoms of Lithium are in Li3N ?
a)
1
b)
2
c)
3
d)
4
39.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
40.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5

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