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9 Chemistry revision

Total questions: 57

Worksheet time: 46mins

Name
Class
Date
1.

Electron

a)

Have a positive charge and are found in the nucleus of an atom.

b)

Have a neutral (no) charge and are found in the nucleus of an atom.

c)

Have a negative charge and are found orbiting the nucleus of an atom.

2.

The positive particles of an atom are ___________.

a)

electrons

b)

protons

c)

neutrons

3.

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

a)

nucleus

b)

electron cloud

c)

center

4.
An atom is made up of protons, neutrons, and electrons.  Which is the smallest subatomic particle?
a)
Proton
b)
Neutron
c)
Electron
d)
Idontknowatron
5.
Each row in a periodic table is called a 
a)
Group
b)
Period
c)
Row
d)
Column
6.
Each column in the periodic table is called a 
a)
period
b)
group
c)
cluster
d)
unit
7.
In the modern periodic table elements are arranged by:
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
8.
Which is an electron?
a)
A
b)
B
c)
C
9.
How many electrons does Si contain? (click to see image)
a)
14
b)
28
c)
2
d)
4
10.
What is the mass number and name of an element with 8 protons and 8 neutrons?
a)
16 - Carbon
b)
16 - Oxygen
c)
24 - Oxygen
d)
8 - Neon
11.
Ice melting
a)
Chemical Change
b)
Physical Change
12.
a)
Physical Change
b)
Chemical Change
13.

It is a process in which a liquid changes into solid. This process involves the release or loss of heat.

a)

Mel

b)

Freezing

c)

Evaporation

d)

Condensation

14.

pH number 3

a)

Acid

b)

Base

c)

Neutral

15.

pH number 7

a)

Acid

b)

Base

c)

Neutral

16.

pH number 14

a)

Acid

b)

Base

c)

Neutral

17.

Water is:

a)

Acid

b)

Base

c)

Neutral

18.

Sodium hydroxide is:

a)

Acid

b)

Base

c)

Neutral

19.

Sodium carbonate is:

a)

Acid

b)

Base

c)

Neutral

20.

Q. The mixing of acids and alkalis in order to form salt and water is what we called (a)  

21.

Complete the word equation below:

Acid + alkali --> ............... + water

a)

water

b)

salt

c)

gold

d)

metal

22.

Excess acids in stomach can be neutralized using ............

a)

antacid

b)

vinegar

c)

slaked lime

d)

hydrochloric acid

23.

How does acid tastes

a)

Sweet

b)

Bitter

c)

Salty

d)

Sour

24.

How does base tastes

a)

Sour

b)

Salty

c)

Bitter

d)

Sweet

25.

This is when heat is absorbed, it is an

a)

Exothermic reaction

b)

endothermic reaction

c)

both

d)

none

26.

When heat is released it is an

a)

exothermic reaction

b)

endothermic reaction

c)

both

d)

none

27.

Fire is an example of

a)

exothermic reaction

b)

endothermic reaction

c)

none

d)

both

28.

A melting ice cube is an example of

a)

exothermic

b)

endothermic

c)

none

d)

both

29.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
30.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
31.

What is Combustion?

a)

reaction between substance (fuel, wood, paper clothes etc) and oxygen that releases Carbon dioxide and Water, with lots of energy.

b)

reaction between substance (fuel, wood, paper clothes etc) and carbon dioxide that releases oxygen and Water, with lots of energy.

c)

reaction between substance (fuel, wood, paper clothes etc) and water that releases Carbon dioxide and oxygen with lots of energy.

d)

Carbon dioxide is what we breathe out

32.
What is the atomic number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
33.
What is the mass number defined as?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
34.

What is the mass number of this atom?

a)

1

b)

3

c)

4

d)

7

35.

An isotope is an atom that has extra numbers of these particles. 

a)

electrons

b)

protons

c)

neutrons

d)

bosons

36.

Which form of radiation is the most highly energetic, being stopped only by lead or thick concrete?  

a)

alpha

b)

beta

c)

gamma

d)

neutrino

37.

Which form of radiation is the lowest energy, composed of a helium nucleus and being stopped by a piece of paper?

a)

alpha

b)

beta

c)

gamma

d)

neutrino

38.

Which form of radiation is an electron and can be stopped by a sheet of aluminum?

a)

alpha

b)

beta

c)

gamma

d)

neutrino

39.

The time it takes for one half of a sample of radioisotopes to decay to a stable state is referred to as which of the following?

a)

half-life

b)

periodicity

c)

mass defect

d)

radiometrics

40.

A 100g sample of element X has a half-life of 3 hours. How much of the sample would be left after 9 hours?

a)

50 g

b)

25 g

c)

12.5 g

d)

6.25 g

41.

A 100 g sample of element X is left for eight hours. After eight hours scientists find that only 6.25 g of the sample is still radioactive. What is the half-life of element X?

a)

8 hrs

b)

6 hrs

c)

4 hrs

d)

2 hrs

42.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
43.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
44.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
45.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
46.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
47.

If the effect is acid rain

What is the cause?

a)

Emissions from factories, power plants and vehicles

b)

Buses

c)

Trains, plans and automobiles

d)

The Black Forest

48.

Acid rain pollutes water and land ecosystems

What is the effect of this?

a)

Endangers wildlife, weakens trees and ecosystems

b)

Destroys buildings

c)

Kills insects

d)

Shorts out electricity

49.

Which is NOT caused by acid rain?

a)

damage to statues

b)

dying fish

c)

spread of disease

d)

weakened trees

50.
How is acid rain formed?
a)
Carbon monoxide and carbon dioxide mix with water in the ocean.
b)
Carbon dioxide and oxygen mix with water in the air.
c)
Sulfur dioxide and carbon monoxide mix with lake water.
d)
Sulfur dioxide and nitrogen oxide mix with water in the air.
51.

Acid rain has a pH LESS than

a)

6

b)

7

c)

8

d)

3

52.

What can acid rain corrode (react and dissolve)?

a)

statues

b)

houses

c)

grass

d)

trees

53.

What does Acid Rain do?

a)

It turns you into the Joker

b)

It burns your face off

c)

It deteriorates the ecosystem and buildings

d)

It... idek

54.
Any atom containing an unstable nucleus is called
a)
radioisotope
b)
unisotope
c)
particles
d)
nuclei
55.
What would two different isotopes of an atom have in common?
a)
Number of neutrons 
b)
Number of protons
c)
Atomic weight 
d)
Atomic mass
56.

What is the Half life of this isotope?

a)

5 seconds

b)

10 seconds

c)

15 seconds

d)

20 seconds

57.

What is the Half Life of this isotope?

a)

3 days

b)

5 days

c)

8 days

d)

10 days

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