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Year 9 Revision_Chemistry & radioactive decay

Total questions: 40

Worksheet time: 30mins

Name
Class
Date
1.
The half-life of cobalt-60 is 5 years. If you have 10 grams of Co-60, how much do you have after 15 years?
a)
1.25g
b)
5g
c)
10g
d)
20g
2.
The half-life of protactinium-226 is 2 minutes. If you have 20 grams of Pa-226, how much do you have after 8 minutes?
a)
1.25g
b)
2.5g
c)
5g
d)
10g
3.
Americium-242 has a half-life of 6 hours. If you started with 24 g and you now have 3 g, how much time has passed?
a)
6 hours
b)
12 hours
c)
18 hours
d)
24 hours
4.
Iodine-131 has a half-life of 8 days. If you have 8 g of I-131 and 16 days pass, how much I-131 do you have left?
a)
1g
b)
2g
c)
4g
d)
8g
5.
Tin-126 has a half-life of 100,000 years. How many years does it take to reduce a 100 g of Sn-126 to 12.5 g?
a)
12,500 years
b)
50,000 years
c)
200,000 years
d)
300,000 years
6.
What does the 6 represent above the C
a)
Symbol 
b)
Name 
c)
Mass Number 
d)
Atomic Number 
7.
An element is defined by its number of 
a)
protons
b)
electrons
c)
neutrons
d)
protons + electrons
8.
Which of the subatomic particles is the lightest
a)
all have the same mass
b)
protons 
c)
neutrons 
d)
electrons
9.

The positive particles of an atom are ___________.

a)

electrons

b)

protons

c)

neutrons

10.

The center of an atom where its neutrons and protons are is called the _____________.

a)

nucleus

b)

electron cloud

c)

center

11.
An atom is made up of protons, neutrons, and electrons.  Which is the smallest subatomic particle?
a)
Proton
b)
Neutron
c)
Electron
d)
Idontknowatron
12.
Which is an electron?
a)
A
b)
B
c)
C
13.

Acids have a pH of _______________.

a)

below 7

b)

above 7

c)

exactly 7

14.

Bases have a pH of _______________.

a)

below 7

b)

above 7

c)

exactly 7

15.

Neutral solutions have a pH of _______________.

a)

below 7

b)

above 7

c)

exactly 7

16.

What ions are there more of in acidic solutions?

a)

H+

b)

OH-

17.

What ions are there more of in basic solutions?

a)

H+

b)

OH-

18.

Which one of these substances will have a NEUTRAL pH?

a)

Lemon juice

b)

Coffee

c)

Bleach

d)

Water

19.

How do acid base indicators work?

a)

They change smell in different pH values

b)

They change temperature in different pH values

c)

They do not do anything in different pH values

d)

They change color in different pH values

20.

Is the following substance an acid or a base? HCl

a)

Acid

b)

Base

21.

After a neutralization reaction takes place, what is the pH of the solution?

a)

1

b)

7

c)

14

d)

there is no pH

22.

What are the products of a neutralization reaction?

a)

acid and base

b)

acid and water

c)

base and salt

d)

water and salt

23.

When HCl is dissolved in water, it will dissociate (break apart) into ion.

What ions does it break apart into?

a)

H+ and Cl-

b)

H+, C+, and l-

c)

H- and Cl+

d)

HC+ and l-

24.

Magnesium is a metal.

hydrochloric acid + magnesium --> magnesium chloride + _________

a)

water

b)

hydrogen

c)

carbon dioxide

d)

oxygen

25.

zinc carbonate is a type of carbonate

hydrochloric acid + zinc carbonate --> zinc chloride + water + _____

a)

water

b)

hydrogen

c)

carbon dioxide

d)

oxygen

26.

Magnesium oxide is a type of base.

hydrochloric acid + magnesium oxide --> magnesium chloride + _________

a)

water

b)

hydrogen

c)

carbon dioxide

d)

oxygen

27.

sodium hydroxide is a type of alkali.

hydrochloric acid + sodium hydroxide --> sodium chloride + _________

a)

water

b)

hydrogen

c)

carbon dioxide

d)

oxygen

28.

Name the salt formed.

hydrochloric acid + sodium hydroxide --> _______ + water

a)

sodium chloric

b)

sodium chloride

c)

sodium chlorine

d)

sodium hydroxide

29.
Most of the mass in an atom is made up of _____________________?
a)
protons and electrons
b)
protons and neutrons
c)
neutrons and electrons
d)
electrons and quarks
30.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
31.
What makes something radioactive?
a)
elements with an atomic number above 81
b)
an unstable nucleus
c)
contaminated sewage
d)
It decays over time
32.
_______________ is the process by which unstable atoms emit radiation until they become stable.
a)
Radiation
b)
Chemical Reaction
c)
Radioactive Decay
d)
Isotopes
33.

An alpha particle is made up of

a)

2 protons and 4 neutrons

b)

1 proton and 1 neutron

c)

2 protons and 2 neutrons

d)

4 protons and 2 neutrons

34.

When a substance undergoes beta decay

a)

The atomic number increases by 1

b)

The atomic number decreases by 2

c)

The atomic number does not change

35.
What type of radioactive decay is shown here?
a)
Alpha decay
b)
Beta decay
c)
Gamma decay
36.

What type of decay is shown here

23892U ---> 23490Th + 42He.

a)

alpha

b)

beta

c)

gamma

37.
When a nucleus undergoes nuclear decay by gamma rays, the atomic number of the element....
a)
remains the same
b)
  decreases by one.
c)
increases by one.
d)
increases by two.
38.

22286Rn —› ____ + 42He

a)

22589Ac

b)

21187Fr

c)

21885At

d)

21884Po

39.

146C —› ____ + 0-1e

a)

126C

b)

147N

c)

148O

d)

145B

40.

An isotope that undergoes B- decay has

a)

too few protons

b)

too many protons

c)

too few neutrons

d)

Too many neutrons

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