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Global Review_Chemistry Grade 8_Narada

Total questions: 50

Worksheet time: 48mins

Name
Class
Date
1.

An object going from a solid to a liquid is

a)

sublimation

b)

deposition

c)

freezing

d)

melting

2.

What state of matter is represented in this picture?

a)

solid

b)

liquid

c)

gas

3.

The cloud-like space that electrons travel around:

a)

nucleus

b)

shell

c)

neutrons

d)

Oort cloud

4.

Protons and neutrons are found in the center of the atom called the:

a)

nucleus

b)

neutron

c)

shell

d)

cell

5.

The subatomic particles are called:

a)

protons, nucleus and electrons

b)

protons, electrons and neutrons

c)

protons, positives and negatives

d)

cloud, shell and quarks

6.

Electrons have a _____ charge.

a)

neutral

b)

negative

c)

positive

d)

both positive and negative

7.

Who invented the simplified version of the atom?

a)

Dmitri Mendeleev

b)

Niels Bohr

c)

Sir Isaac Newton

d)

Albert Einstein

8.

The Atomic number is known as the _______

a)

Number of electrons in an atom

b)

Number of Protons in an atom

c)

Number of neutrons in an atom

d)

Number of Protons and electrons in an atom

9.

What charge do protons have?

a)

Positive

b)

Negative

c)

Neutral

10.

What is the Atomic Number of this Element

a)

7

b)

3

c)

4

d)

1

11.

What is the Atomic Mass Number of the element mentioned above

a)

12

b)

6

c)

C

d)

16

12.

What is the number of protons in Magnesium atom ?

a)

12

b)

24

c)

23

d)

8

13.

How many Neutrons are present in the Sodium atom ?

a)

12

b)

11

c)

0

d)

23

14.
In order for an atom to be neutral what has to be true?
a)
The atom has more protons than neutrons
b)
The atom has more neutrons than protons
c)
The atom has the same number of protons and neutrons
d)
The atom has the same number of protons and electrons
15.

How many electrons does this atom have?

a)

2

b)

4

c)

6

d)

10

16.
What is the symbol for CALCIUM?
a)
C
b)
Cl
c)
Ca
d)
Cm
17.

What is the atomic number of boron?

(a)  

18.

How many protons does argon have in its nucleus?

(a)  

19.

What element has 10 protons in its nucleus?

(a)  

20.

What is the symbol of the element with 14 protons in its nucleus?

(a)  

21.

Which one ISN'T a real element from the first 20?

a)

Sodium

b)

Magnesium

c)

Argon

d)

Comicon

22.

What are reactants?

a)

The chemicals that start the reaction.

b)

The chemicals that the reaction produced.

c)

The chemicals that are on the right side of the arrow.

23.

What are products?

a)

The chemicals that start the reaction.

b)

The chemicals that the reaction produced.

c)

The chemicals that are on the left side of the arrow.

24.

What is the type of reaction shown above?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

25.

Identify the reaction type:

C2H6 + O2 --> CO2 + H2O

a)

Double replacement

b)

Synthesis

c)

Acid base

d)

Combustion

26.
This pictures simulates what type of reaction?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
27.

Identify the reaction type:

NaCl + KOH --> KCl + NaOH

a)

Double replacement

b)

Combustion

c)

Synthesis

d)

Decomposition

28.

Which of the following is an acid-base reaction?

a)

2Na + Cl2 → 2NaCl

b)

CH4 + 2O2 → CO2 + 2H2O

c)

HCl + KOH → KCl + H2O

d)

CaCO3 → CO2 + CaO

29.

What type of reaction involves the breaking down of a substance into simpler substances?

a)

Single Replacement Reaction

b)

Double Replacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

30.
NaCl
a)
Sodium Monochloride
b)
Sodium Chloride
c)
Disodium chloride
d)
Chlorine Sodiumide
31.
P2O3
a)
DiPhosphorus Trioxide
b)
MonoPhoshorus Oxide
c)
Monophosphorus Trioxide
d)
DiPhosphorus Oxide
32.
SCl2
a)
Sulfur Chloride
b)
Sulfur trichloride
c)
Disulfur chloride
d)
Sulfur Dichloride
33.
FeCl₂
a)
iron chloride
b)
iron (II) chloride
c)
iron (I) chloride
d)
iron dichloride
34.
The name of Ni₂O₃ is
a)
nickel (II) oxide
b)
nickel (III) oxide
c)
nickle oxide
d)
dinickel trioxide
35.
The chemical formula of magnesium phosphide is
a)
MgP
b)
Mg₂P₃
c)
Mg₃P₂
d)
Mg₃(PO₄)₂
36.
The chemical formula of iron (III)bromide is
a)
FeBr
b)
Fe(III)Br
c)
FeBr₃
d)
Fe₂Br₃
37.

Which symbol shows a chemical reaction has occured?

a)

A

b)

B

c)

C

d)

D

38.

Identify the product(s) in this word equation

a)

Sodium

b)

Sodium chloride

c)

Sodium and Chlorine

d)

Sodium and sodium chloride

39.

Magneisum reacts with oxygen to form magnesium oxide. The correct word equation is...

a)

A

b)

B

c)

C

d)

D

40.

The word equation for this reaction : Mg + CO2 → MgO + C

4 lines
41.

The word equation of CaCO3 → CaO + CO2

4 lines
42.

How many products are there in this reaction?

a)

One

b)

Two

c)

Three

d)

Four

43.

How many neutron are present in a drop of ethanol, C2H5OH

4 lines
44.

What is the total number of hydrogen atoms in benzamide, C6H5CONH2?

4 lines
45.
What is the unit of relative molecular mass?
a)
kilogram
b)
gram
c)
gram per mole (g/mol)
d)
no units
46.
The formula of a compound is M(OH)2. Given that the Mr of the compound is 98, calculate the Ar of M.
a)
32
b)
64
c)
81
d)
94
47.

What is the relative formula mass of ammonium nitrate, NH4NO3 ?

[Relative atomic mass: N, 14; H, 1; O, 16]

a)

76

b)

79

c)

80

d)

90

48.

Calculate the relative formula mass of

aluminium sulphate, Al2(SO4)3


[Relative atomic mass:

O = 16 ; Al = 27 ; S = 32 ; Cl = 35.5 ; Cu = 64 ]

(a)  

49.

The atomic mass of an element is the ___.

a)

average of the mass number and the atomic number for the element

b)

weighted average of the masses of the isotopes of the element

c)

total mass of the isotopes of the element

d)

total number of subatomic particles in the nucleus

50.

What is the relative formula mass of hydrated magnesium sulphate, MgSO4.7H2O?


[Relative atomic mass : H = 1, O = 16, Mg = 24 , S = 32]

a)

145

b)

150

c)

239

d)

246

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