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Chemical Reactions and Solutions

Total questions: 67

Worksheet time: 2hrs 32mins

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.
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
4.
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
5.

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.

6.

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

a)

Product

b)

Reactant

c)

Starters

d)

Enders

7.

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

8.

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

9.

Which one shows that a chemical reaction has occurred?

a)

dissolving

b)

melting

c)

formation of a gas

d)

bending

10.

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

11.

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

12.

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.

13.

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

14.

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.

15.
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
16.
_________ is (are) made of more than one atom.
a)
A molecule
b)
Protons
c)
Neutrons
d)
An element
17.
________ result(s) in no new substances.
a)
A physical change
b)
A chemical change
c)
Physical and chemical changes
d)
None of the above
18.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
19.

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.

20.
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
21.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
22.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HCIO3
d)
H20
23.
Digesting your food is an example of 
a)
chemical change
b)
physical change
24.

CH2Cu8 - How many Copper atoms are in this formula?

a)

1

b)

2

c)

8

d)

16

25.

What is the coefficient for this formula? 9NaCl2

a)

9

b)

2

c)

1

d)

11

26.

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

27.

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

a)

coefficient

b)

subscript

c)

exponent

d)

chemical formula

28.

Is this equation balanced?

2H2O yields H2 + 2O2

a)

Yes

b)

No

29.

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

30.

Is this equation balanced?

C + 2H2 yields CH4

a)

No

b)

Yes

31.

How many total atoms are in this formula? 3Zn2O3H

a)

6

b)

9

c)

18

32.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
33.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

34.

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

a)

NH3

b)

H2O

c)

CaCl2

d)

CH4

35.

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

36.

Al2

a)

A single atom

b)

Elemental Molecule

c)

Compound Molecule

d)

None of these

37.

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

Na + H2O --> NaOH + H2

a)

Yes

b)

No

38.

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

Mg + Cl2 --> MgCl2

a)

No

b)

Yes

39.

How many Aluminum atoms are in Al2O3?

a)

3

b)

2

c)

5

40.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
41.

Which of the following is a physical change?

a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
42.

What happens in a Chemical Reaction?

a)

a) Chemical bonds are formed

b)

b) Chemical bonds are broken

c)

both a & b

d)

None

43.

How many Carbons are present on the reactant side?

a)

1

b)

2

c)

3

d)

4

44.
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. 
45.
What is the best formula for this molecule?
a)
2H2O
b)
H3O
c)
H2O2
d)
H2O
46.
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.
47.
What is the total number of atoms in this molecule?
a)
2
b)
4
c)
1
d)
6
48.

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

a)

6

b)

12

c)

24

d)

36

49.

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

a)

1

b)

2

c)

3

d)

4

50.
Two or more substances blended together, keeping their own properties and not turning into a new substance defines a ___________.
a)
Suspension 
b)
Mixture
c)
Solution 
d)
Filter 
51.
A mixture in which substances are completely blended or dissolved and cannot be separated defines a _________________. 
a)
Solution
b)
Mixture
c)
Suspension 
d)
Filter 
52.
Mixtures an be easily separated by observable properties such as particle size, shape, and magnetic attraction. 
a)
True
b)
False
53.
__________ are made up of solutes and solvents.
a)
Solutions
b)
Suspension
c)
Colloid
d)
mixtures
54.

Alloy is a ...

a)

A chemical compound with combination between metal and non-metal

b)

A salt contain of two or more elements where the main element is non-metal

c)

Mixture of two or more elements where the main element is metal

55.
Which is an example of a solute?
a)
Egg whites
b)
Sugar
c)
Water
d)
Acetone
56.
Which is an example of a solvent?
a)
Salt
b)
Egg whites
c)
Water
d)
Sugar
57.

What is a solvent

a)

A liquid that will dissolve a solid solute

b)

Another word for solution

c)

A thing that make drinks change colour

d)

Usually the solid about to be dissolved

58.

The substance being dissolved in a solution is the?

a)

solution

b)

solute

c)

solvent

d)

mixture

59.

Which one loses its identifying characteristics 

a)
Mixture
b)
Solution 
60.

Which one does not lose its identifying characteristics 

a)
Mixture
b)
Solution 
61.

As temperature increases, what happens to particles?

a)

They speed up

b)

They slow down

62.

What is happening in this picture of ice melting?

a)

Molecules are speeding up

b)

Molecules are slowing down

63.

What is happening in this picture of water boiling?

a)

Molecules are speeding up

b)

Molecules are slowing down

64.
Sublimation is
a)
when solid turns into gas
b)
when gas turns into plasma
c)
when liquid turns into gas
d)
when gas turns into solid
65.

Condensation

a)

A gas changes into a liquid

b)

A liquid changes into a gas

c)

A solid changes into a liquid

d)

A liquid changes into a solid

66.

Evaporation

a)

A gas changes into a liquid

b)

A solid changes into a liquid

c)

A liquid changes into a gas

d)

A liquid changes into a solid

67.

Solubility depends on

a)

Temperature of solute

b)

pressure & concentration of solvent

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