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Chemical Reactions and Formulas

Total questions: 49

Worksheet time: 1hrs 18mins

Name
Class
Date
1.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
2.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
3.

Which of the following is a physical change?

a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
4.
What type of change occurs when a new substance is formed that has different properties from the original substances?
a)
chemical change
b)
nuclear change
c)
physical change
d)
mutation
5.
Which of the following is an example of a chemical change?
a)
rusting of a bicycle
b)
painting a house
c)
washing a dog
d)
tearing up a newspaper
6.

What is the BEST definition of a chemical reaction?

a)

A change in matter that produces one or more NEW substances

b)

When two things combine and EXPLODE.

7.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

8.

Which of the following is an example of a chemical change?

a)

water freezes to form ice

b)

sugar dissolves in water

c)

gasoline burns in a car engine

d)

a piece of metal expands when it is heated

9.

A change in the shape of an object is an example of _________________.

a)

a chemical change

b)

energy

c)

an endothermic change

d)

a physical change

10.

Which one shows that a chemical reaction has occurred?

a)

dissolving

b)

melting

c)

formation of a gas

d)

bending

11.

A chemical change is different than a physical change because in a chemical change

a)

chemicals are used

b)

molecules do not physically touch

c)

a new substance is formed and in a physical no new substance is formed

d)

the change can be seen but in a physical change it cannot

12.

Which of the following 2 are chemical reactions?

a)

sugar dissolving in water

b)

water turning into steam

c)

burning wood

d)

mixing baking soda and vinegar

e)

tearing paper

13.

How many Carbons are present on the reactant side?

a)

1

b)

2

c)

3

d)

4

14.

How many Oxygens are on the product side of this chemical equation?

a)

1

b)

2

c)

3

d)

4

15.

Why are chemical equations always balanced? Select ALL that apply.

a)

Matter cannot be created.

b)

Matter cannot be destroyed.

c)

Matter can only be rearranged/conserved.

d)

Matter doesn't matter.

16.

In a chemical reaction, if the reactants are heated, the reaction usually happens

a)

slower

b)

faster

c)

at the same rate

d)

in a smaller volume

17.

Which of the following is a common sign that a chemical change has occurred?

a)

A chemical has turned a different color, bubbled, and/or changed temperature.

b)

A chemical has changed to a different state of matter, such as a liquid to a solid.

c)

A chemical has changed size.

d)

A chemical has become a different shape.

18.
Which observation(s) might be used as evidence that a chemical reaction occurred?
a)
Color change
b)
Odor change
c)
Properties change
d)
All of the above
19.
_________ is (are) made of more than one atom.
a)
A molecule
b)
Protons
c)
Neutrons
d)
An element
20.
________ result(s) in no new substances.
a)
A physical change
b)
A chemical change
c)
Physical and chemical changes
d)
None of the above
21.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
22.

In chemical reactions, what does the Law of Conservation of Matter mean?

a)

Matter is not created or destroyed.

b)

The total mass of the reactants is greater than the total mass of the products.

c)

The total mass of the reactants is less than the total mass of the products.

d)

Matter is not changed.

23.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
24.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
25.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HCIO3
d)
H20
26.
Digesting your food is an example of 
a)
chemical change
b)
physical change
27.

CH2Cu8 - How many Copper atoms are in this formula?

a)

1

b)

2

c)

8

d)

16

28.

What is the coefficient for this formula? 9NaCl2

a)

9

b)

2

c)

1

d)

11

29.

This tells you how many atoms of an element you have in a chemical formula

a)

coefficient

b)

subscript

c)

chemical symbol

d)

atomic number

30.

This tells you the number of molecules you have of a substance

a)

coefficient

b)

subscript

c)

exponent

d)

chemical formula

31.

Is this equation balanced?

2H2O yields H2 + 2O2

a)

Yes

b)

No

32.

This equation is not balanced. Which element has more atoms on one side than the other?

2HCl + CaCO3 yields CaCl + H2O + CO2

a)

Cl

b)

Ca

c)

H

d)

O

33.

Is this equation balanced?

C + 2H2 yields CH4

a)

No

b)

Yes

34.

How many total atoms are in this formula? 3Zn2O3H

a)

6

b)

9

c)

18

35.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
36.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

37.

Which of the following could be an organic compound? Hint: organic means it contains Carbon!

a)

NH3

b)

H2O

c)

CaCl2

d)

CH4

38.

How many atoms are represented in the reactants of this equation?

a)

6

b)

12

c)

24

d)

36

39.

Which of the following chemical equations follows the Law of Conservation of Mass? Hint: which is balanced?

a)

CO2 + H2O --> C6H12O6 + O2

b)

C6O + H12O --> C6H12O2

c)

CO2 + H2O --> C6H12O6 + O2

d)

CO2 +H2O --> C6H12O6 +O2

40.

Al2

a)

A single atom

b)

Elemental Molecule

c)

Compound Molecule

d)

None of these

41.

Does this follow the Law of Conservation of Mass? (Is it balanced?)

Na + H2O --> NaOH + H2

a)

Yes

b)

No

42.

Does this follow the Law of Conservation of Mass? (is it balanced?)

Mg + Cl2 --> MgCl2

a)

No

b)

Yes

43.

How many Aluminum atoms are in Al2O3?

a)

3

b)

2

c)

5

44.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
45.

What happens in a Chemical Reaction?

a)

a) Chemical bonds are formed

b)

b) Chemical bonds are broken

c)

both a & b

d)

None

46.
What is the best definition for molecule? 
a)
A molecule is formed when two or more atoms join together chemically.
b)
A molecule is made of only one atom. 
47.
What is the best formula for this molecule?
a)
2H2O
b)
H3O
c)
H2O2
d)
H2O
48.
Choose the correct statement.
a)
Atoms are the biggest particle in a element.
b)
Atoms are the smallest particle in a molecule.
c)
Atom is the smallest particle in a element.
d)
Atoms are nice.
49.
What is the total number of atoms in this molecule?
a)
2
b)
4
c)
1
d)
6

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