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Y9 Chemistry revision Sem 2

Total questions: 116

Worksheet time: 2hrs 0mins

Name
Class
Date
1.

Does this diagram show an endothermic or exothermic reaction?

a)

Exothermic

b)

Endothermic

2.

Does this diagram represent and exothermic or endothermic reaction?

a)

exothermic

b)

endothermic

3.
When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?
a)
a change of color
b)
a change of state
c)
a temperature decrease
d)
a temperature increase
4.

The Law of Conservation of Mass states that in a chemical reaction,

a)

mass of the reactants and mass of the products are equal

b)

new elements are formed

c)

new atoms are created

d)

atoms are destroyed

5.
What is true of this reaction?
a)
Equal amounts of energy were released and absorbed
b)
The reaction released more energy than it absorbed
c)
The reaction absorbed more energy than it released
6.
How do you know that energy is being absorbed during a chemical reaction?
a)
Temperature increases
b)
Temperature decreases
7.
What happens to the temperature of the solution when the reaction is absorbing heat?
a)
The temperature decreases.
b)
The temperature increases.
c)
The temperature stays the same.
8.
Sydnee mixes a solution of baking soda and water. The initial temperature of the solution is 22⁰C. She adds 10mL of vinegar and takes the temperature again. The final temperature is 17⁰C. Which of the following is true?
a)
The reaction is exothermic
b)
The reaction is endothermic
c)
ΔH is negative
d)
The reaction lost heat to the environment.
9.
What types of reactions absorb and release heat?
a)
acidic and basic
b)
endothermic and exothermic
c)
endothermic and heat transfusion
d)
covalent and ionic
10.
In a chemical reaction
a)
The atoms of the reactants always stay together to form the products
b)
The atoms of the reactants unbond, rearrange, and then rebond to form the products
c)
New atoms are formed which combine to make the products
d)
Some atoms disappear while others multiply to form the products
11.
In an endothermic reaction the products have 
a)
more energy than the reactants
b)
less energy than the reactants
c)
the same energy as the reactants
d)
no energy
12.
In an exothermic reaction the products have
a)
more energy than the reactants
b)
the same energy as the reactants
c)
less energy than the reactants
d)
no energy
13.

Water is a neutral substance, what is its pH?

a)

4

b)

6

c)

7

d)

9

14.

According to the theory of conservation of mass, which property of the reactants is always unchanged after a chemical reaction?

a)

mass

b)

colour

c)

state

d)

volume

15.

The pH range of an acid is:

a)

0 to 7

b)

7 to 14

c)

14 to 21

d)

-7 to 0

16.

To make something more acidic, should you add more OH- or H⁺ ions?

a)

Add more OH-

b)

Add more H⁺ ions

17.

Bases are also used in everyday life and are mostly found in different cleaning products. What are two characteristics of a base?

a)

Sour taste and turns red litmus blue

b)

Bitter taste and slippery feel

c)

Sweet taste and turns blue litmus red

d)

Neutral taste and no effect on litmus

18.

What is the pH range of a base?

a)

0-7

b)

7-14

c)

14-21

d)

Neutral

19.

Inside of an atom we can find three different things, what are the charges for the following: Electrons - ________________________ Protons - ________________________ Neutrons - ________________________

a)

Electrons - Negative, Protons - Positive, Neutrons - Neutral

b)

Electrons - Positive, Protons - Negative, Neutrons - Neutral

c)

Electrons - Neutral, Protons - Positive, Neutrons - Negative

d)

Electrons - Negative, Protons - Neutral, Neutrons - Positive

20.

Which of the following is a property of an acid?

a)

Bitter taste

b)

Slippery feel

c)

Sour taste

d)

Neutral taste

21.

Which of the following is a characteristic of a base?

a)

Sour taste

b)

Slippery feel

c)

Neutral pH

d)

Turns blue litmus red

22.

The substances which combine in a chemical reaction is called?

a)

Products

b)

Reactants

c)

Combining elements

d)

Refractions

23.
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
24.
In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.
a)
reactants
b)
products
c)
neutrals
d)
energizers
25.

How many Carbons are present on the reactant side?

a)

1

b)

2

c)

3

d)

4

26.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)

Reaction is taking place (proceeding)

d)
Chemical Equation 
27.
What types of reactions absorb and release heat?
a)
acidic and basic
b)
endothermic and exothermic
c)
endothermic and heat transfusion
d)
covalent and ionic
28.
When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?
a)
a change of color
b)
a change of state
c)
a temperature decrease
d)
a temperature increase
29.

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

a)

1

b)

2

c)

3

d)

4

30.

___________ is matter that is made up of only one type of atom

a)

Protons

b)

An element

c)

Electrons

d)

Dirt

31.

The part of an atom that contains the mass is the

a)

The electron cloud

b)

The proton

c)

The nucleus

32.

The 2 subatomic particles found in the nucleus are:

a)

Protons and neutrons

b)

Protons and electrons

c)

Neutrons and electrons

d)

Only neutrons are found in the nucleus

33.

Which of the following is correct?

a)

Protons are positive, electrons have no charge and neutrons are negative

b)

Protons have a negative charge, neutrons are neutral and electrons are negative

c)

Protons have a positive charge and neutrons have no charge and electrons have a negative charge

34.

To calculate the atomic mass of an atom...

a)

Find the sum of the electrons and neutrons

b)

Find the sum of the protons and electrons

c)

Find the sum of the protons and neutrons

d)

Find the sum of all the protons, neutrons and electrons don't weigh anything

35.

How many protons, neutrons and electrons does aluminium have?

a)

13 protons, 13 electrons and 13 neutrons

b)

13 protons, 14 electrons and 13 neutrons

c)

13 protons, 13 electrons and 27 neutrons

d)

13 protons, 13 electrons and 14 neutrons

36.

How many protons does Phosphorus have?

(a)  

37.

How many electrons does Phosphorus have?

(a)  

38.

How many neutrons does Phosphorus have?

(a)  

39.

Choose the correct answer:

a)

Chromium has 24 protons, 14 electrons and 14 neutrons

b)

Chromium has 24 protons, 24 electrons and 24 neutrons

c)

Chromium has 24 protons, 28 electrons and 28 neutrons

d)

Chromium has 24 protons, 24 electrons and 28 neutrons

40.

If an element has equal number of electrons and protons, the atom is electrically _______.

a)

positively charged

b)

negatively charged

c)

an isotope

d)

neutral

41.

How many electrons does the first shell hold?

a)

1

b)

2

c)

4

d)

8

42.
The central region of an atom where its neutrons and protons are is its 
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
43.
An atom with atomic number 6 would have how many protons 
a)
6
b)
12
c)
3
d)
cannot be determined 
44.
True or False? Neutrons have a negative charge
a)
True
b)
False
45.

How many electrons does this oxygen atom have?

a)

16

b)

8

c)

24

d)

6

46.

If both protons and neutrons are found in the nucleus, why is it positive?

a)

The reason it is positive is because neutrons have a positive charge and protons have a negative charge.

b)

The reason it is positive is because neutrons have a negative charge and protons have a positive charge

c)

The reason it is positive is because neutrons have no charge and protons have a positive charge.

d)

The reason it is positive is because neutrons have no charge and protons have a negative charge

47.

The part of the salt that caused the colour in the flame test was

a)

chloride

b)

the metal

c)

the gas

48.
which atom has  4 neutrons?
a)
Li-6
b)
Li-7
c)
Li-8
d)
they have the same # of neutrons
49.
Two isotopes of carbon are carbon-12 and carbon-14.  These isotopes differ from one another by two protons.
a)
true
b)
false
50.

True or False

Electrons have a negative charge?

a)

True

b)

False

51.

What does the number 6 represent in the image?

a)

Atomic Number

b)

Mass Number

c)

Number of Electrons

d)

Relative Mass Number

52.

What does the number 12.011 represent in the image?

a)

Number of electrons

b)

Atomic Number

c)

Relative Mass Number

d)

Mass Number

53.

Based on the image, which of the following statements is true?

a)

Helium has 2 protons and 2 neutrons

b)

Helium has 6 electrons

c)

Helium has 4 protons and 2 neutrons

d)

Helium has 2 protons and 4 neutrons

54.

Which of these describes an alpha particle? 

a)

a hydrogen nucleus

b)

a hydrogen atom

c)

a helium nucleus

d)

a helium atom

55.

The figure shows the structure of an oxygen-14 atom. 

Which subatomic particle is A? 

a)

nucleus

b)

electron

c)

neutron

d)

proton

56.

The figure shows the structure of an oxygen-14 atom. 

Which subatomic particle is B? 

a)

nucleus

b)

electron

c)

neutron

d)

proton

57.

The figure shows the structure of an oxygen-14 atom. 

Which subatomic particle is C? 

a)

nucleus

b)

electron

c)

neutron

d)

proton

58.

Which one of these symbols describes the nucleus of a different isotope of beryllium from Be-9?

a)
b)
c)
d)
59.

Some rocks contained uranium when they were formed. 

Radioactive decay in these rocks produces radon gas. 

Explain why people living near these rocks have an increased health risk from background radiation. 

4 lines
60.

State the name of an instrument that can be used to measure radioactivity. 

4 lines
61.

There are many types of background radiation. Which of the following would NOT be a source of background radiation?

a)

Sun

b)

Rocks

c)

Food

d)

Gamma

62.

Which of the follow is a false statement:

a)

Beta rays can be stopped by our clothes

b)

Alpha rays can be stopped by our skin

c)

Gamma rays can only be stopped by a thick lead or concrete layer

d)

Beta rays cannot be stopped by anything

63.

Which of the following is NOT a form of radiation

a)

Gamma

b)

Delta

c)

Alpha

d)

Beta

64.

Which of the following is the symbol for alpha particles?

a)

α

b)

β

c)

δ

d)

β

65.

Alpha particles are composed of

a)

4 neutrons

b)

2 neutrons and 2 protons

c)

2 protons and 2 radioactive electrons

d)

energy

66.

Beta particles are composed of

a)

x rays

b)

2 neutrons and 2 protons

c)

an electron

d)

energy

67.

Gamma particles are composed of

a)

x rays

b)

2 neutrons and 2 protons

c)

an electron

d)

photons (pure energy)

68.

Alpha particles have the greatest mass, then beta and gamma particles do not have any mass.

a)

True

b)

False

69.

All particles in a radioactive atom are emitted from:

a)

the surrounding atoms

b)

the nucleus

c)

the orbiting shells

d)

the waves

70.

Which of the following cause damage to human tissue because they come from heavy metals?

a)

Yo mama's particles

b)

Alpha particles

c)

Gamma particles

d)

Beta particles

71.

Which of the following are most similar to X-rays

a)

Delta particles

b)

Alpha particles

c)

Gamma particles

d)

Beta particles

72.

The particle that does the least amount of damage is a:

a)

Gamma particle

b)

Dust particle

c)

Alpha particle

d)

Beta particle

73.

Which of the following travels at the speed of light

a)

All radiation

b)

Alpha particles

c)

Beta particles

d)

Gamma particles

74.

Which of the following travels the SLOWEST

a)

All radiation

b)

Alpha particles

c)

Beta particles

d)

Gamma particles

75.

Suppose you leave a 0.2g sample of technetium-99 in a cupboard overnight. Technetium transmutates into ruthenium. How long would the sample of technetium have been left in the cupboard for, if there was 0.175g of ruthenium present the next day? (a)   hours

76.

Smoke detectors contain radioactive americium. The americium emits an alpha particle when it transmutates. Alpha particles are

a)

positively-charged

b)

negatively-charged

c)

not charged, because they are pure energy

77.

If a sample of americium-241 is left to undergo alpha decay, the transmutation is fairly slow. After 1296 years, 87.5% of the americium will be gone. What is the half-life of americium? (a)   years

78.

Earth elements decay and change into another element in a process called_____________.

a)

radiation

b)

isotope

c)

radioactive decay

d)

half-life

79.

Geologist use the time it takes for a radioactive isotope to decay to half its original mass called a___________.

a)

radioactive decay

b)

isotope

c)

half-life

d)

carbon dating

80.

What is the Half Life of this isotope?

a)

3 days

b)

5 days

c)

8 days

d)

10 days

81.

The Half Life of Californium 252 is 5 years.

a)

TRUE

b)

FALSE

82.

The time it takes for a radioactivity level to drop by a half is is the sample's ___________________.

a)

quarter life

b)

whole life

c)

wonderful life

d)

half life

83.

If the half life of a radioactive element is 100yrs, how long would it take for the radioactivity to reduce by one half?

a)

200yrs

b)

100yrs

c)

50yrs

d)

300yrs

84.
_______________ is the process by which unstable atoms emit radiation until they become stable.
a)
Radiation
b)
Chemical Reaction
c)
Radioactive Decay
d)
Isotopes
85.
What is Half-life?
a)
The amount of time it takes for some of the nuclei in a sample of the isotope to decay
b)
The amount of time it takes for half the electrons in a sample of the isotope to decay
c)
The amount of time it takes for half the nuclei in a sample of the isotope to decay
d)
the amount of time it takes to double the nuclei in a sample of the isotope to decay
86.

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 2.4 minutes has elapsed?

a)

100.0g

b)

50.0g

c)

12.5g

d)

8.5g

87.
After the third half-life, how much of the sample is left?
a)
1/2
b)
1/3
c)
1/16
d)
1/8
88.
What quantities vary between isotopes of an element?
a)
protons, electrons, and atomic mass
b)
protons, electrons, and atomic number
c)
neutrons and electrons
d)
neutrons and atomic mass
89.
Different isotopes have...
a)
different masses
b)
different atomic numbers
c)
different electrons
d)
different protons
90.
What do these isotopes of carbon all have in common?
a)
neutrons & mass number
b)
atomic number and neutrons
c)
atomic number and electrons
d)
protons, atomic number, and mass number
91.
How many neutrons in C-14?
a)
6
b)
7
c)
14
d)
8
92.
Two isotopes of carbon are carbon-12 and carbon-14.  These isotopes differ from one another by two protons.
a)
true
b)
false
93.

An endothermic reaction

a)

Releases heat

b)

Absorbs heat

c)

Discovers

d)

Relieves

94.

An exothermic reaction

a)

Releases heat

b)

Absorbs heat

c)

Discovers

d)

Relieves

95.

Water condensing from a gas to a liquid releases energy. This is an example of...

a)

An exothermic reaction

b)

An endothermic reaction

96.

Which of the following are examples of an exothermic chemical reaction? Check all that apply.

a)

Photosynthesis

b)

Burning a piece of wood

c)

Freezing water into ice

d)

None of the above

97.

If you feel the temperature decrease in a reaction then it is

a)

Exothermic

b)

Endothermic

98.

If you feel the temperature increase in a chemical reaction, then it is

a)

Endothermic

b)

Exothermic

99.

a)

Endothermic

b)

Exothermic

100.

a)

Endothermic

b)

Exothermic

101.

Acids are neutralised by...

a)

Bases

b)

Metals

c)

Water

d)

Hydrogen gas

102.

Bases are neutralised by...

a)

Acids

b)

Metals

c)

Water

d)

Hydrogen gas

103.

A neutralisation reaction produces...

a)

Acids

b)

Bases

c)

neutral water

d)

pH > 7

104.

Acids have a pH

a)

greater than 7

b)

lower than 7

c)

equal to 7

105.

Bases have a pH...

a)

greater than 7

b)

lower than 7

c)

equal to 7

106.

Water has a pH...

a)

greater than 7

b)

lower than 7

c)

equal to 7

107.

Which of the following is a property of an acid?

a)

Form hydroxide ions

b)

Have a negative charge

c)

Turn litmus paper blue

d)

Have a pH of 0-6.9

108.

The label on a bottle indicates that the substance inside has a pH of 13. Which of the following statements is an accurate description of the substance?

a)

It has a large concentration of Hydrogen ions

b)

It has a large concentration of Hydroxide ions

c)

It has a small concentration of Hydroxide ions

d)

It has no ions at all

109.

Observe the chart below. Which substance is likely an acid?

a)

Substance A

b)

Substance B

c)

Substance C

d)

Substance D

110.

Milk of magnesia is a common ingredient in many heartburn and stomach medications. How does milk of magnesia act to calm and upset stomach?

a)

Milk of magnesia is an acid that neutralizes stomach acid

b)

Milk of magnesia is a base that neutralizes stomach acid

c)

Milk of magnesia has a neutral nature which dilutes stomach acid.

d)

Milk of magnesia is a base that neutralizes bases in the stomach.

111.

According to the pH range which substance is more acidic than cabbage juice?

a)

lemon juice

b)

lye

c)

milk of magnesia

112.
Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
a)
strongly acidic
b)
slightly acidic
c)
strongly basic
d)
slightly basic
113.

Which of the following is the strongest acid?

a)

oven cleaner - 13.5

b)

lemon juice - 2.5

c)

soap - 10

d)

blood - 7.4

114.

What does pH measure?

a)

the amount of hydrogen (H+) ions

b)

the amount of hydroxide (OH-) ions

c)

amount of water

d)

all of the above

115.

Which of the following is a characteristic of a base?

a)

bitter

b)

sour

c)

corrosive

d)

releases hydrogen ions in water

116.

Which of the following is a characteristic of an acid?

a)

bitter

b)

slippery

c)

sour

d)

releases hydroxide ions in water

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