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Review of pHyscial and Chemical Changes

Total questions: 60

Worksheet time: 57mins

Name
Class
Date
1.

Which PE Diagram represents an endothermic reaction?

a)

A

b)

B

2.

When a new substance has formed during a chemical reaction, it is considered to be what type of change occurring?

(a)  

3.

Which is the name of the kind of solid substance formed in this figure?

a)

color change

b)

precipitate

c)

acid

d)

chemicals

4.

Check ALL the boxes that show the signs of a chemical change.

a)

sound and smell

b)

air

c)

color change

d)

gas (bubbles) produced

e)

forces

5.
In a container, a solid consisting of clear crystals is combined with a blue liquid and the following observations are obtained: How many of the listed observations indicate a new substance was formed?
a)
1
b)
2
c)
3
d)
4
6.
Four students performed four different investigations by combining different substances. Which of the observations is most indicative of a chemical reaction?
a)
investigation 1
b)
investigation 2
c)
investigation 3
d)
investigation 4
7.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid. 
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
8.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
d)
The mass of the combined liquids is greater than either original liquid.
9.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
10.

The reactants in the image above are:

a)

CH4 and 2 O2

b)

2 H2O and CO2

c)

All of these are reactants

d)

All of these are products

11.

This a balanced chemical equation.

a)

True

b)

Fale

12.

In the reaction above water is a ________________.

a)

Reactant

b)

Product

13.

An gel ice pack getting cold after you put it in the freezer for an hour.

a)

Chemical Change

b)

Physical Change

14.
Which of the following IS a physical change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
15.
What indicates a chemical reaction occurred?
a)
Heat or Light is released
heat or light is produced
b)
gas (bubbles) produced
c)
color change
d)
all of the above
16.

1. How is a chemical change different from a physical change?

a)

there is no difference

b)

a physical change creates a new substance

c)

a chemical change creates a new substance

17.
Your mother used pancake mix, eggs, and milk to make pancakes.  Which of these is the product?
a)
the pancake mix
b)
the eggs
c)
the milk
d)
the pancakes
18.
How do chemical reactions turn substances into new substances?
a)
with burning acid
b)
the molecules mix together and create new substances
c)
the atoms break apart and combine back together in new ways
d)
the ionic compounds mix in water to form solutions
19.
The only way you can be certain that a chemical reaction has occured is by? 
a)
Light has been emitted 
b)
a colour change has occurred 
c)
bubbles appear 
d)
identifying one or more new chemical products 
20.
Why is tearing a piece of paper only a physical change?
a)
It changes the paper. 
b)
It is hard to tear. 
c)
It only changes its size, but it's still paper
d)
None of the above
21.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
22.
__NaClO3 --> __NaCl + __O2
a)
2,2,2
b)
2,2,3
c)
3,2,2
d)
1,2,3
23.

The properties of a compound are the same as the properties of the elements making up the compound.

a)

True

b)

False

24.

Particles formed from covalent bonding are called ions.

a)

True

b)

False

25.

A chemical equation shows a chemical reaction using symbols instead of words.

a)

True

b)

False

26.

A chemical symbol is the abbreviated way to write a compound's name.

a)

True

b)

False

27.

A chemical bond that occurs when atoms share electrons is a(n) __________ bond.

a)

Ionic

b)

Covalent

c)

Polyatomic

d)

Magnetic

28.

How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?

a)

2

b)

4

c)

6

d)

8

29.

How many total hydrogen atoms are present in a molecule of ammonium acetate, NH4C2H3O2?

a)

3

b)

4

c)

7

d)

12

30.

A chemical reaction in which energy is absorbed in the form of heat is called _____.

a)

synthetic

b)

combustion

c)

exothermic

d)

endothermic

31.

Chemical equations must be balanced because they describe how chemical reactions obey the principle of _____.

a)

Activation

b)

Decomposition

c)

Conservation of mass

d)

Reactants

32.

When two or more substances combine to form a more complex substance (ex. 2Mg + O2 --> 2MgO), the process is called a _____.

a)

Synthesis reaction

b)

Decomposition reaction

c)

Replacement reaction

d)

Physical change

33.
Is making orange juice a physical or chemical change?
a)
Physical 
b)
Chemical
34.
In an exothermic reaction, energy is _________.
a)
Released
b)
Absorbed
c)
Stored
d)
Doubled
35.

Identify the reaction type:

C2H6 + O2 --> CO2 + H2O

a)

Double displacement

b)

Synthesis

c)

Acid base

d)

Combustion

36.

Identify the reaction type for the following equation:

K + F2 --> KF

a)

Double displacement

b)

Single Replacement

c)

Synthesis

d)

Decomposition

37.

Identify the type of reaction:

ZnCl2 + Mg --> Zn + MgCl2

a)

Precipitate

b)

Single Replacement

c)

Double Displacement

d)

Decomposition

38.

Identify the reaction type:

NaCl + KOH --> KCl + NaOH

a)

Double displacement

b)

Combustion

c)

Redox

d)

Precipitate

39.

What type of reaction releases energy into the surrounding environment as heat?

a)

Endothermic

b)

Exothermic

40.

What type of reaction would cause the surrounding environment to feel cooler?

a)

Endothermic

b)

Exothermic

41.

In the graph, the reactant chemicals have more energy stored in them than the products do. What kind of reaction is it, and where is the extra energy?

a)

Endothermic; the extra energy is sent out as heat from the chemicals

b)

Endothermic; the extra energy is taken in heat by the chemicals

c)

Exothermic; the extra energy is sent out as heat from the chemicals

d)

Exothermic; the extra energy is taken in as heat by the chemicals

42.
The rate of a chemical reaction is NOT affected by which of the following:
a)
temperature
b)
concentration
c)
particle size (surface area)
d)
All of these affect reaction rates
43.

Pick the TWO (2) options that will INCREASE the rate of a reaction.

a)

Reducing Heat

b)

Adding Catalyst

c)

Adding Heat

d)

Removing Catalyst

44.
What type of reaction is this?
a)
Endothermic
b)
Exothermic
45.

Substances that are made up of ONLY one type of atom (element) or compound.

a)

Heterogeneous mixture

b)

Pure substance

c)

Suspension

d)

Homogeneous mixture

46.

Which of the following is classified as a pure substance?

a)

Lemonade

b)

Fruit punch

c)

ketchup

d)

Hydrogen

47.

Which of these is an element?

a)

Salt (NaCl)

b)

Water (H20)

c)

Oxygen (O)

d)

Carbon Dioxide (CO2)

48.

Which of these is a compound?

a)

Aluminium (Al)

b)

Carbon Dioxide (CO2)

c)

Nitrogen (N)

d)

Sand

49.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
50.
What is the only substance with a neutral pH of 7?
a)
Milk
b)
Orange Juice
c)
Water
d)
Blood
51.

In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship?

a)

Both of the solution are Bases

b)

Both of the solution are Acids

c)

The Baking soda is an acid and the Bleach is a base

d)

The baking soda is a base and the Bleach is an Acid.

52.
Bleach is a strong base, what is the pH level of bleach?
a)
13
b)
14
c)
1
d)
2
53.

Tastes sour

a)

acid

b)

base

c)

neutral

d)

both acids & bases

54.

Tastes bitter.

a)

Acids

b)

Bases

c)

None of the following

d)

Acids & Bases

55.

These can burn you if they are strong enough.

a)

Acids

b)

Bases

c)

Water

d)

Acids & Bases

56.

An ice cube weighs 20 grams. How much will it weigh after it melts?

a)

10 grams

b)

15 grams

c)

20 grams

d)

25 grams

57.

Dante dissolves three grams of sugar in 55 grams of water. How much does the mixture weigh?

a)

50 grams

b)

52 grams

c)

55 grams

d)

58 grams

58.

Heat is added to a cube of iron until it melts. More heat is added until the iron becomes a gas. All of the gas is captured and cooled back into a cube of iron. How will the weight of the cube compare to the original cube?

a)

It will weigh less

b)

It will weigh more

c)

It will weigh the same

d)

They cannot be compared

59.

What is the Law of Conservation of Mass?

a)

States that mass is greater when heated than when cold.

b)

Mass is less than when it is cold and heated.

c)

States that mass is neither created nor destroyed in chemical reactions.

d)

States that mass is both greater and less than.

60.

What is a mixture?

a)

a combination of substances

b)

when sugar dissolves in water

c)

measuring the mass of a powder

d)

when a scale is balanced perfectly

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