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Natural Sciences Grade 9 /term 2 practice exam

Total questions: 83

Worksheet time: 1hrs 2mins

Name
Class
Date
1.

What is the main function of the circulatory system?

a)

To digest food

b)

To transport nutrients and oxygen

c)

To produce hormones

d)

To break down waste

2.

The top chambers of the heart are called:

a)

Ventricles

b)

Atriums

c)

Veins

d)

Arteries

3.

Explain the difference between oxygenated and deoxygenated blood.

a)

Oxygenated blood is rich in carbon dioxide, while deoxygenated blood is rich in oxygen.

b)

Oxygenated blood is rich in oxygen, while deoxygenated blood is rich in carbon dioxide.

c)

Both types of blood have the same oxygen content.

d)

Oxygenated blood is found only in the veins.

4.

The role of the heart in circulation is (a)   .

Choose from the below words
To filter blood.
To store blood.
To pump blood throughout the body.
To produce blood cells.
5.

Name the three types of blood vessels and describe their functions.

a)

Arteries, veins, capillaries.

b)

Arteries, veins, nerves.

c)

Capillaries, nerves, muscles.

d)

Veins, muscles, arteries.

6.

What is the function of the heart?

a)

Protects organs and produces red blood cells.

b)

Generates heat.

c)

Breaks down food into nutrients.

d)

To acts as a pump to move the blood.

7.

What happens during gaseous exchange in the lungs?

a)

Oxygen leaves the blood, and carbon dioxide enters

b)

Carbon dioxide leaves the blood, and oxygen enters

c)

Blood is filtered

d)

Blood is stored

8.

What is this organ?

a)

Large intestine

b)

Small intestine

c)

Stomach

9.

What can we find in the oral cavity/mouth?

a)

Stomach

b)

Gastric Juices

c)

Teeth & tongue

10.

What is this organ?

a)

Oesophagus

b)

Stomach

c)

Oral cavity

11.

What is this organ?

a)

Small intestine

b)

Oesophagus

c)

Large intestine

12.

What is this organ?

a)

Small intestine

b)

Oesophagus

c)

Large intestine

13.

What is the function of the Small intestine?

a)

takes the nutrients from the food.

b)

takes the nutrients and the water

c)

segregates gastric juices

14.

What is the function of the Large intestine?

a)

takes the nutrients from the food.

b)

takes the nutrients and the water

c)

segregates gastric juices

15.

It is a TUBE where the food passes.

a)

Stomach

b)

Small intestine

c)

Large intestine

d)

Oesophagus

16.

Elements on the periodic table are arranged in...

a)

periods

b)

groups

c)

they're randomly placed

d)

in periods & groups

17.

Using the image here, what is the symbol for Phosphorus?

a)

Ph

b)

P

c)

Ps

d)

Po

18.

After food leaves the esophagus, it enters the stomach. From here, it will enter the _____ and then the _______. (Select two.)

a)

Liver

b)

Small intestine

c)

Gallbladder

d)

Large intestine

19.

Where does digestion begin?

a)

mouth

b)

esophagus

c)

stomach

d)

small intesine

20.

The majority of digestion and absorption occurs here. Name this organ.

(a)  

21.

Your teeth rip and tear your food into smaller pieces. This is an example of what type of digestion?

a)

physical digestion

b)

chemical digestion

22.

A substance has a pH of 12. What is this substance?

a)

acid

b)

neutral

c)

base

23.

A substance has a pH of 7. What is this substance?

a)

acid

b)

neutral

c)

base

24.

In the chemical equation below, what is the PRODUCT?

NaCl → Na + Cl

a)

Na + Cl

b)

NaCl

c)

→

d)

N

25.

In the chemical equation below, what is the REACTANT?

CO2 → C + O2

a)

→

b)

C + O2

c)

CO2

d)

physical change

26.

Fe + O3 → FeO3 shows a ___ has occurred.

a)

chemical change

b)

physical reaction

c)

physical change

d)

no change

27.

In a chemical equation, what is PRODUCED or what is on the RIGHT is called the __.

a)

reactants

b)

product

c)

yields

28.

Which are the following are evidence of a CHEMICAL REACTION?

a)

bubbles or producing a gas

b)

new substance is formed

c)

burning

d)

acid is produced

e)

change in state

29.

C12 + H22 + O11 → C12H22O11


How many Carbon, C, atoms are in the PRODUCT of this equation?

a)

12

b)

24

c)

11

d)

22

30.

Is this chemical equation BALANCED?

C + 02 → CO

a)

NO

b)

YES

31.

The products of a reaction have the same ________as the reactants.

a)

molecule

b)

atoms

c)

subscripts

d)

coefficients

32.

When balancing this equation, Fe + Cl2 → FeCl3, the correct coefficient for Cl2?

a)

1

b)

2

c)

3

d)

4

33.

Chemical reactions

a)

create and destoy atoms

b)

only occurs outside living organisms

c)

occurs only in living organisms

d)

produce new substances

34.

Balance this equation, CaCO3(s) → CaO(s) + CO2(g)?

a)

3,1,2

b)

1,1,1

c)

1,3,1

d)

2,6,3

35.

Balance this equation, AlCl3 + NaOH → Al(OH)3 + NaCl

a)

3,1,3,1

b)

1,3,3,1

c)

1,1,1,3

d)

1,3,1,3

36.

Balance the following equation: Cr(s) + Fe(NO3)2 (ag) → Fe(s) + Cr(NO3)3 (ag)

a)

2,3,3,2

b)

2,3,2,3

c)

4,6,6,2

d)

1,3,3,1

37.
Fill in the blanks with coefficient:
PCl5+_ H2O→_ HCl+H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
38.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
39.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
40.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
41.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
42.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
43.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
44.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
45.
Which is the Law of Conservation of Matter?
a)
matter cannot be created or destroyed, it only changes form
b)
matter can be created but it cannot be destroyed, it never changes form
c)
matter can be destroyed but it cannot be created, it usually just changes form
d)
matter is an unproven theory created by Hans Geiger
46.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
47.

What are the blue numbers called?

a)

oxidation numbers

b)

subscripts

c)

group numbers

d)

product numbers

48.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

49.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
50.

The vertical (up and down) columns in the Periodic Table are called

a)

groups

b)

towers

c)

periods

d)

atomic numbers

51.
The Modern Periodic Table of Elements is arranged by
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
52.
Sodium (Na) is found in period 
a)
3
b)
2
c)
4
d)
1
53.
What does the atomic mass tell you? 
a)
Basically,the number of electrons and protons
b)
The number of neutrons
c)
Basically, the number of protons and neutrons
d)
The number of protons.
54.
The atoms we study in 6th grade are neutral, which means they have the same number of
a)
protons and electrons
b)
protons and neutrons
c)
electrons and neutrons
55.
What does the 6 represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol 
56.
What does 12.011 represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol 
57.
These are found on the Periodic Table.
a)
Compounds
b)
Elements
c)
Mixtures
58.

The horizontal (side to side) rows in the Periodic Table are called

a)

groups

b)

families

c)

periods

d)

atomic numbers

59.

The ovaries _____.

a)

produce egg cells and estrogen

b)

are the male reproductive cells

c)

are the female reproductive cells

d)

is a muscular organ where fertilized eggs implant and develop

60.

The uterus _____.

a)

produce egg cells and estrogen

b)

are the male reproductive cells

c)

are the female reproductive cells

d)

is a muscular organ where fertilized eggs implant and develop

61.

Sperm cells _____.

a)

produce egg cells and estrogen

b)

are the male reproductive cells

c)

are the female reproductive cells

d)

is a muscular organ where fertilized eggs implant and develop

62.

What do ovaries contain?

a)

Pre-matured egg cells.

b)

Sperm

c)

Carbon dioxide

d)

All of them

63.

What is the part that are pointed out?

a)

Vagina

b)

Ovaries

c)

Fallopian Tubes

d)

Menstruation Flow

64.

Whats the part pointed out?

a)

Uterus

b)

Vagina

c)

Fallopian Tubes

d)

Menstrual Flow

65.

What is the part pointed out?

a)

Cervix

b)

Uterus

c)

Vagina

d)

Menstrual Flow

66.

what is the part that is pointed out?

a)

Cervix

b)

uterus

c)

fallopian tube

d)

vagina

67.
What is the uterus
a)
Where the baby grows
b)
Holds the baby in
c)
Where the eggs come from
d)
Sensory organ
68.

____________ is also known as the birth canal; the passageway from the uterus to the outside of the body.

a)

Ovaries

b)

Uterus

c)

Fallopian Tubes

d)

Vagina

69.

What is the chemical formula of Magnesium chloride?

a)

MgCl

b)

MgCl2

c)

MgC

d)

MgC2

70.

What is the name of this chemical, H2SO4?

a)

Hydrogen sulfate

b)

Sulfuric acid

c)

Sulfate

d)

Sulfate hydrogen

71.

What is the formula of nitric acid?

a)

H2SO4

b)

HNO3

c)

HCl

d)

hno3

72.

What is the valency of Calcium (Ca)

a)

1

b)

2

c)

3

d)

4

73.
How many valence electrons are in an atom of Ba?
a)
2
b)
8
c)
4
d)
1
74.
How many valence electrons are in an atom of Ar?
a)
2
b)
8
c)
4
d)
1
75.
How many valence electrons are in an atom of K?
a)
3
b)
8
c)
4
d)
1
76.

What is the formula of the compound formed between magnesium and oxygen?

a)

MgO

b)

Mg2O2

c)

MgO2

d)

Mg2O

77.
How many valence electrons are in an atom of P?
a)
4
b)
5
c)
2
d)
3
78.

Which of the following correctly represents the electronic distribution in the Mg atom? .

a)

3, 8, 1

b)

2, 8, 2

c)

1, 8, 3

d)

8, 2, 2

79.

How is valency determined for elements?

a)

Based on the color of the element

b)

By the number of protons in the nucleus

c)

According to the atomic mass of the element

d)

Based on the number of electrons an element needs to gain, lose, or share to achieve a full outer shell.

80.

What is the valency of sodium in NaCl?

a)

-1

b)

2

c)

0

d)

+1

81.
How many valence electrons are found in atoms of group 1?
a)
7
b)
6
c)
4
d)
1
82.

How many valence electrons does carbon have?

a)

4

b)

5

c)

6

d)

7

83.
How many electrons can the first energy level hold?
a)
1
b)
2
c)
8
d)
0

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