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Chemical Formulas

Total questions: 48

Worksheet time: 32mins

Name
Class
Date
1.

The _____ describes the atoms in a compound.

a)

Chemical Equation

b)

Chemical Formula

c)

Chemical Symbol

d)

Coefficient

2.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

3.

How many atoms of carbon (C) are in C6H12O6?

a)

3

b)

6

c)

12

d)

24

4.

Element or Compound?

H2O

a)

Element

b)

Compound

5.

Which of the following is a compound?

a)

Co

b)

O2

c)

C

d)

CO2

6.

Which is the correct formula for:

3 Hydrogen (H)

1 Sulfur (S)

4 Oxygen (O)

a)

H3SO4

b)

HSO4

c)

H4S3O

d)

H2O

7.

How many TOTAL atoms are in:

H2SO4

a)

6

b)

5

c)

7

d)

3

8.

How many atoms of Sodium (Na) are in 6NaCl?

a)

1

b)

12

c)

3

d)

6

9.

The substances at the beginning of a chemical equation are called the ______

a)

product

b)

yield

c)

chemical symbol

d)

reactants

10.

How many different elements are present in H2COCH2

a)

5

b)

4

c)

3

d)

2

11.

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

a)

Coefficient

b)

Exponent

c)

Multiplier

d)

Subscript

12.

4CF2Cl2

a)

C = 4, F = 4, Cl = 2

b)

C = 1, F = 8, Cl = 8

c)

C = 4, F = 8, Cl = 8

d)

C = 1, F = 4, Cl = 8

13.

H2SO4

a)

H = 2, S = 4, O = 4

b)

H = 2, S = 1, O = 4

c)

H = 8, S = 4, O = 4

d)

H = 2, SO = 4

14.

A ______ is a number written in front of a chemical formula.

a)

Coefficient

b)

Subscript

c)

Exponent

d)

Coordinator

15.

A subscript is the small number below the element symbol that tells the number of _______ of that element.

a)

atoms

b)

valence electrons

c)

protons

d)

elements

16.

How many atoms are present if there is no subscript following the element symbol?

a)

0

b)

2

c)

only 1

d)

1 million

17.

Coefficients tell the number of __________ in a formula.

a)

Molecules

b)

Atoms

c)

Elements

d)

Oxygen

18.

Reactants are

a)

new substances

b)

old substances

c)

likely to disappear

d)

likely to appear

19.

When writing a chemical equation, reactants are on the _____________ while products are on the _________________.

a)

top, bottom

b)

right, left

c)

left, right

d)

bottom, top

20.

The law of conservation of mass states

a)

chemical reactions create new atoms

b)

atoms cannot be created or destroyed

c)

reactants vanish once a reaction takes place

d)

products appear when a reaction takes place

21.

The amount of atoms on each side of a chemical equation are

a)

different

b)

the same

22.

The products of a reaction have the same ________as the reactants.

a)

molecule

b)

atoms

c)

subscripts

d)

coefficients

23.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
24.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
25.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
26.

How many Magnesium atoms are in 10MgCl2?

a)

10

b)

5

c)

20

27.

How many atoms are there TOTAL in H2SO4 ?

a)

6

b)

5

c)

7

d)

3

28.

NaCl is the chemical formula for salt. Is NaCl considered a compound or an element?

a)

element

b)

compound

c)

both

d)

neither

29.
Which equation obeys the law of conservation of mass?
a)
H2 + O2 ------>  H20
b)
C + 2H2 ---->  CH4
c)
2Fe2O3  ------> 2O2 + 4Fe
30.

The ________________ which are represented by a single uppercase letter, or represented by an uppercase letter followed by a lowercase letter. This tells you the types of elements in the compound.

a)

metals

b)

element symbols

c)

metalloids

d)

nonmetals

31.
Which of these is not a chemical reaction?
a)
Burning of wood
b)
Milk going bad
c)
Mixing vinegar and baking soda
d)
Melting of ice
32.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
33.

The Law of Conservation of Mass States

a)

Energy cannot be created nor destroyed, it can only change form.

b)

Mass cannot be created nor destroyed, it can only change form.

c)

Mass can be created or destroyed, it cannot change form.

34.

All the matter is made up of

a)

Atoms

b)

Mixtures

c)

Compounds

d)

Reactions

35.

An element is formed by

a)

Atoms of the same kind

b)

Atoms of different kind

c)

compounds and atoms

d)

Compounds and mixtures

36.

IS a substance formed by atoms of a different kind

a)

Element

b)

Compound

c)

Mixtures

d)

Atoms

37.
Anything that has mass & takes up space
a)
gravity
b)
force
c)
matter
d)
volume
38.
Number written below & to the right of a chemical symbol
a)
subscript
b)
reactant
c)
product
d)
coefficient
39.
Number placed in front of a chemical formula
a)
product
b)
coefficient
c)
reactant
d)
subscript
40.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
41.
Substances that form as the result of a chemical reaction
a)
products
b)
reactants
c)
coefficients
d)
subscripts
42.

How many oxygen atoms are in the products for the chemical reaction below?
4Fe + 3O2 → 2Fe2O34Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3  

a)

2

b)

3

c)

5

d)

6

43.

The Law of Conservation of Mass says that matter can neither be __________ or __________.

a)

created; destroyed

b)

recycled; renewed

c)

subtracted; added

d)

joined; separated

44.

How many atoms are in the products below?
4Fe +3O2 → 2Fe2O34Fe\ +3O_{2\ }\rightarrow\ 2Fe_2O_3  

a)

7

b)

10

c)

17

d)

20

45.

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

a)

The wood disappears.

b)

It stays the same chemically.

c)

The atoms in the wood and oxygen rearrange and form smoke and ash.

d)

Nothing.

46.
A 55-gram egg is placed in a pot. After the egg is boiled, which is most likely the mass of the egg?
a)
50 
b)
55 
47.
In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 
a)
4g
b)
5g
c)
9g
d)
14g
48.
Jason poured 500 grams of water into a container and tightly sealed it. The water was allowed to freeze. Which is most likely true about the ice that formed?
a)
The mass of the ice is the same as the mass of the water.
b)
The mass of the ice is greater than the mass of the water.
c)
The ice formed is a different substance than the water.
d)
The ice formed is the same temperature as the water.

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