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LT4 Chapter 7&8

Total questions: 115

Worksheet time: 1hrs 26mins

Name
Class
Date
1.

Which example provides evidence of a chemical change?

a)

Wood releases ash and smoke when burned.

b)

Rock particles separate when soil is being sifted.

c)

Boiling water bubbles when being heated.

d)

Sugar is not visible when dissolved in water.

2.

When vinegar and baking soda are combined, bubbles and foam are produced.

What evidence demonstrates that a chemical change has occurred?

a)

A color change occurs.

b)

A gas is formed.

c)

A solid is dissolved.

d)

A precipitate is formed.

3.

In a _______ change, a substance changes into a different substance

a)

physical

b)

chemical

4.

Which of these is NOT a sign a chemical change has occurred?

a)

color change

b)

temperature change

c)

bubble formation

d)

cutting material

5.

The Law of Conservation of Mass states

a)

that matter exists in all states and reacts the same

b)

that matter can only be changed into new substances by introducing a catalyst

c)

that matter exists in the same state throughout any chemical change

d)

that matter cannot be created or destroyed

6.

SELECT ALL THAT APPLY: Why is it important that chemical equations are always balanced?

a)

Matter cannot be created

b)

Matter cannot be destroyed

c)

Matter can only be rearranged

d)

Matter doe

7.

SELECT 2: 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

8.

In a chemical equation, the reactants are found on the _____ of the arrow

a)

right

b)

left

9.

An ending substance that is made during a chemical reaction

a)

reactant

b)

product

10.

A starting substance that is part of a chemical reaction

a)

Reactant

b)

Product

11.

A process in which atoms rearrange to form new substances

a)

chemical reaction

b)

chemical formula

c)

science

12.

Select the pair of words that correctly displays the general FORMAT for writing chemical equations

a)

products --> reactants

b)

products --> products

c)

reactants--> products

d)

reactants --> reactants

13.

The total mass of the reactants is 18.4g. What would the total mass of the products be? (NOTE: Refer to the Law of Conservation of Mass)

a)

18.4g

b)

9.2g

c)

4.6g

d)

36.8g

14.

Reactant 1 is 4 grams, reactant 2 is 2 grams. How many total grams is the product?

a)

4 grams

b)

2 grams

c)

6 grams

d)

10 grams

15.

What are the 5 signs of a chemical reaction?

a)

Gas released, smoke or fire, fizzing and new atoms created.

b)

Gas released, color change, smoke or fire, new substances form, and temperature change.

c)

Gas released, new lights, and bubbles.

d)

Bubbling or fizzing, color change, smoke or fire, new substances form, and old atoms destroyed.

16.

What does this model show?

a)

physical change

b)

phase change

c)

chemical change

d)

ooohh colors!

17.

According to the Law of Conservation of Mass, the total mass of the reactants...

a)

is always same as the total mass of the reactants.

b)

is sometimes more or sometimes less than the products.

c)

is a new substance formed from the chemical reaction.

d)

is equal to the total mass of the products.

18.

Copper oxide and carbon dioxide are made when copper carbonate is heated strongly. Which is a product?

a)

Heat

b)

Copper carbonate

c)

Copper oxide

d)

Oxygen

19.

What is another name for combustion?

a)

Reduction

b)

Burning

c)

James

d)

Displacement

20.

Combustion reactions always release energy. What word can be used to describe them?

a)

Endothermic

b)

Exothermic

c)

Reversible

d)

Fluorescent

21.

Which of these is found in the fire triangle and is therefore essential for combustion?

a)

Oxygen

b)

Water

c)

Carbon dioxide

d)

Hydrogen

22.

This image shows a

a)

chemical reaction

b)

physical change

c)

musical change

d)

all of these answers are correct

23.

This change is a

a)

chemical reaction

b)

physical change

c)

musical change

d)

all answers are correct

24.

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

25.

The products 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

26.

When energy is absorbed and taken in during a chemical reaction it is called

a)

exothermic

b)

endothermic

c)

eccentric

d)

ectomorphic

27.

When energy like heat and light are given off in a chemical reaction it is called

a)

exothermic

b)

endothermic

c)

eccentric

d)

ectomorphic

28.

When the matter in a chemical reaction gets warmer it is called

a)

exothermic

b)

endothermic

c)

eccentric

d)

endomorphic

29.

When the matter in a chemical reaction gets colder it is called

a)

exothermic

b)

endothermic

c)

eccentric

d)

endomorphic

30.

The products are:

a)

molecular oxygen and 2 carbon

b)

2 carbon monoxide

c)

all of these are products

d)

all of these are reactants

31.

The reactants are:

a)

molecular oxygen and 2 carbon

b)

2 carbon monoxide

c)

all of these are products

d)

all of these are reactants

32.

A combination of symbols that represents the elements in a compound.

a)

subscripts

b)

Chemical formula

c)

products

d)

reactants

33.

A substance that enters into a chemical reaction.

a)

Reactants

b)

Compounds

c)

PH

d)

Water

34.

A one letter or two letter set of characters used to identify an element.

a)

symbols

b)

products

c)

elements

d)

coefficient

35.

The periodic table shows that Carbon has 6 protons. This means that Carbon also has

a)

6 electrons

b)

Atomic mass of 6

c)

12 Electrons

d)

No properties

36.

How are elements sorted?

a)

by their atomic number

b)

by the atomic weight

c)

alphabetically

d)

by the groups

37.

What are the charges of a PROTON, NEUTRON, and ELECTRON.

a)

Negative, Neutral, Positive

b)

Neutral, No charge, Positive

c)

Positive, Neutral, Negative

d)

Positive, Negative, Neutral

38.

Which of the following is an element?

a)

Water

b)

Baking soda

c)

Carbon Dioxide

d)

Neon

39.

Which of the following is a compound?

a)

Gold

b)

Siver

c)

Iron

d)

Water

40.

Two or more elements that are chemically combined.

a)

Elements

b)

Compounds

c)

Mixtures

d)

Solutions

41.

What are elements?

a)

Pure substances that can NOT be broken down into something else.

b)

Substances that can be broken down into other substances.

c)

Elements can be heterogeneous or homogeneous.

d)

Elements can be solutions.

42.

If an element has 113 protons, what is it's atomic number?

a)

12

b)

113

c)

13

d)

1.3

43.

This ID's the element. It also gives you the number of protons inside the element.

a)

Atomic mass

b)

Atomic number

c)

Mass number

d)

Isotope number

44.

A subatomic particle with a neutral charge.

a)

Proton

b)

Neutron

c)

Electron

d)

Ion

45.

Where do you find the amount of electrons in an element?

a)

Atomic Weight

b)

Chemical Name

c)

Chemical Symbol

d)

Atomic Number

46.

What is the atomic weight made up of?

a)

number of protons and neutrons

b)

Number of protons and electrons

c)

Number of electrons and neutrons

d)

Number of elements and metals

47.

Which of the following determines the identity of an atom?

a)

Protons

b)

Neutrons

c)

Electrons

d)

Negative

48.

What is the atomic number of this element?

a)

6

b)

12.011

c)

14

d)

12

49.

How many electrons does this element have?

a)

1

b)

106.11

c)

26

d)

53

50.
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
51.
WHY is burning a campfire a chemical change? 
a)
It created a new substance with new properties
b)
It changes in size 
c)
There is a lot of smoke
d)
The logs get smaller 
52.
Is burning a campfire a chemical or physical change?
a)
Chemical
b)
Physical 
53.
In this model, the reactants are...
a)
2H2O
b)
H2O2
c)
2H2
d)
O2
54.
Why is ice freezing ONLY a physical change? 
a)
The ice is colder than water. 
b)
It can stay cold when you put it in the freezer. 
c)
The molecules of water do NOT change. They only slow down and vibrate in position. 
d)
Its physical appearance does NOT change. 
55.
Which of the following IS a physical change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
56.
Which of the following IS a chemical change
a)
using chalk
b)
water freezing
c)
slicing cheese
d)
digestion
57.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
58.
The number of atoms of oxygen in 
Cu(NO3)2 is ...
a)
2
b)
5
c)
6
d)
zero 
59.

How could we make this reaction happen more quickly?

a)

Crush the chalk to increase the surface area

b)

Decrease the concentration of the acid

c)

Put the test tube in an ice bath

60.

The sugar cubes are called the

a)

solute

b)

solvent

61.

The water is called the

a)

solvent

b)

solute

62.
Anna filled a ​cup with hot tea. Then she added a sugar cube. ​Which of these will help to make the sugar cube dissolve more quickly? 
a)
stirring the hot tea
b)
adding more sugar cubes
c)
adding ice to the tea
d)
pouring more tea into the cup
63.
Ernesto and Amanda fill two cups with water. They use hot water in one cup and cold water in the other cup. Next, they will stir a spoon of salt into each cup.     

In which cup will the salt dissolve more slowly? 
a)
The salt will not dissolve in either cup
b)
The salt dissolves more slowly in the hot water
c)
The salt dissolves more slowly in the cold water
d)
The salt dissolves at the same speed in both cups
64.
What is a substance that is dissolved in another substance? 
a)
solution
b)
solute
c)
solvent
d)
compound
65.
Look at the diagram. In this diagram, the red dots represent
a)
the solute
b)
the solvent
c)
the solution
66.
Look at the diagram. In this diagram, the blue area represents
a)
the solute
b)
the solvent
c)
the solution
67.

water can't dissolve ...............

a)

sugar

b)

oil

c)

salt

d)

coffe

68.
__________ are made up of solutes and solvents.
a)
Solutions
b)
Suspension
c)
Colloid
d)
mixtures
69.
Capable of being dissolved
a)
Soluble
b)
concentration
c)
colloid
d)
molarity
70.
You can make a solution more concentrated by adding __________.
a)
solute
b)
solvent
c)
water
71.

What things can be dissolved?

a)

salt

b)

sand

c)

black pepper powder

72.

The sugar cubes are called the

a)

solute

b)

solvent

73.

The water is called the

a)

solvent

b)

solute

74.

The process of evenly mixing one substance into another forming a solution is ................... process

a)

concentration

b)

heating

c)

dissolving

d)

condensation

75.

.................. is often called the universal solvent

a)

Oil

b)

Water

c)

Acetone

d)

air

76.

when a solvent can no longer hold any more solute

a)

saturation

b)

dilute

c)

dissolve

77.
__________ are made up of solutes and solvents.
a)
Solutions
b)
Suspension
c)
Colloid
d)
mixtures
78.
When a solution is saturated:
a)
No additional material will dissolve in it
b)
You need to stir it more 
c)
Two materials have combined to create a clear liquid
d)
Crystals form 
79.
amount of solute that can dissolve in a given amount of solvent at a given temperature
a)
saturated solution
b)
solubility
c)
pure substance
d)
colloid
80.

Some substances ........................... when you mix them with water.

a)

squash

b)

dissolve

c)

heat

81.

Substances that dissolve in water are called ...................

a)

soluble

b)

insoluble

c)

solution

82.

Substances that do not dissolve in water are called ...................

a)

soluble

b)

insoluble

c)

solution

83.

The mix of solute and solvent

a)

soluble

b)

insoluble

c)

solution

84.

The liquid that the solid dissolve into.

a)

soluble

b)

solute

c)

solvent

85.

The flour is …………………………., it means it cannot dissolve.

a)

insoluble

b)

solution

c)

soluble

86.

Look at the diagram. B is?

a)

Solute

b)

Solvent

c)

Solution

87.

Look at the diagram. A is?

a)

Solute

b)

Solvent

c)

Solution

88.

Look at the following picture.

A powder is about to be poured into the liquid. Which of the following should be done to make this powder dissolve faster?

a)

freeze the mixture

b)

store the mixture in a dark place

c)

add more powder to the liquid

d)

stir the powder in the liquid

89.

Zahra wants to make a solution, she has a spoonful of baking soda powder, which of the following ingredients must Zahra mix to make a solution?

a)

more salt

b)

water

c)

sand

d)

rocks

90.

Stirring the solution increases the rate of dissolution (rate of dissolving).

a)

True

b)

False

91.

The smaller the particle size the faster the rate of dissolution (rate of dissolving).

a)

True

b)

False

92.

How does cold water affect the speed of dissolving?

a)

Cold water slows down dissolving.

b)

Cold water speeds up dissolving.

c)

Cold water has no effect on dissolving.

d)

Cold water has no effect on dissolving.

93.

Jackson is making dinner and is trying to dissolve salt into a pot of water. The salt is dissolving slowly. What should Jackson do to speed up the rate of dissolving?

a)

He should put larger salt particles in the water.

b)

He should heat the water to a higher temperature.

c)

He should completely stop stirring the pot of water.

d)

He should slow down the speed he is stirring the pot.

94.

to spread out evenly in a liquid

a)

Evaporation

b)

Dissolve

c)

Magnetic

d)

Solute

95.
What are the two structures found in the atom's nucleus?
a)
Electrons and Neutrons
b)
Protons and Electrons
c)
Protons and Neutrons
d)
Neutrons and Electrons
96.
What does the atomic number tell you?
a)
Number of Protons
b)
Number of Neutrons
c)
Sum of protons and neutrons
97.

How many neutrons are in the element shown?

a)

4

b)

9

c)

5

d)

13

98.
The modern periodic table of elements is arranged by 
a)
Number of neutrons
b)
State of matter
c)
Atomic number
d)
Atomic Mass
99.

Use your periodic table to find which element has 5 protons.

a)

Lithium

b)

Calcium

c)

Boron

d)

Neon

100.
What is matter composed of?
a)
Atoms
b)
Space
c)
Electrons
d)
Ions
101.

Which element has an atomic mass of 19?

a)

Hydrogen

b)

Argon

c)

Fluorine

d)

Potassium

102.

How do you find the number of neutrons in an atom?

a)

Atomic Number

b)

Atomic Mass

c)

Atomic Mass - Atomic Number

d)

Atomic Number + Atomic Mass

103.

How many electrons does the element in the picture have?

a)

19

b)

39

c)

20

d)

58

104.

What is the atomic mass of the element shown?

a)

14

b)

28

c)

42

105.
Which of these is not a noble gas?
a)
Helium
b)
Argon
c)
Nitrogen
d)
Krypton
106.

How many elements are there on the Periodic table?

a)

101

b)

99

c)

118

d)

125

107.

Symbol of Silicon is ...

a)

Si

b)

S

c)

Sl

d)

Sn

108.

Pb is symbol for ...

a)

Lead

b)

Potassium

c)

Phosphorus

d)

Platina

109.

Below are symbol of gold, silver, and sodium ...

a)

Au, Ag, and Na

b)

Ge, S, and S

c)

Au, S, and Na

d)

Ga, Ag, and Na

110.

Number 12.001 refers to ...

a)

number of mass

b)

number of atom

c)

number of proton

d)

number of electron

111.
What is the chemical symbol for Lithium?
a)
H
b)
He
c)
Li
d)
N
112.
Diamonds are a pure form of what element?
a)
Carbon
b)
Oxygen
c)
Silicon
d)
Silver
113.

the basic structural unit of matter

a)

atom

b)

matter

c)

element

d)

nucleus

114.

In an element box, the number at top is the

a)

atomic number

b)

atomic name

c)

atomic mass

d)

atomic symbol

115.

The chemical symbol in this element box is

a)

26

b)

Fe

c)

Iron

d)

55.845

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