Grade 9 Science Exam review

Question 1

An atom of iron has 26protons, 26 electrons and 29 neutrons. What is the mass of this atom?

Accepted Answer

55

Question 2

An atom does not have which of the following parts?

Accepted Answer

Ions

Question 3

Which of the following isthe correct arrangement of electrons in a silicon atom?

Accepted Answer

2-8-4

Question 4

As water turns to steam,

Accepted Answer

the molecules speed up.

Question 5

Which of the following is nota process in the carbon cycle?

Accepted Answer

Fixation

Question 6

Which of the following is not an example of static electricity?

Accepted Answer

Your computer being powered on.

Question 7

Potential difference is measured in what unit?

Accepted Answer

Volts

Question 8

A primary consumer eats what?

Accepted Answer

A producer

Question 9

Which of the following is not a physical property?

Accepted Answer

Combustibility

Question 10

When in parallel, what happens as resistors are added?

Accepted Answer

Resistance decreases

Question 11

Which of the followingdoesn’t involve static electricity?

Accepted Answer

Circuit diagrams

Question 12

Pick the right answer.

Accepted Answer

Pick this one

Question 13

Ionic compounds are a combination of what?

Accepted Answer

A metal and non-metal

Question 14

Which of the following is nota molecular compound?

Accepted Answer

CaCl2

Question 15

A substance of mass 24 g and density 12 g/cm3 has a volume of what?

Accepted Answer

2 cm3

Question 16

What does climate change refer to?

Accepted Answer

All of the above

Question 17

What is the most important part of the nitrogen cycle fororganisms in an ecosystem?

Accepted Answer

Bacteria convertatmosphere N into ammonia and nitrates

Question 18

An astronomical unit represents

Accepted Answer

the distance it is from the Sun to Earth.

Question 19

Which of the following is nota change of state?

Accepted Answer

Transpiration

Question 20

What is the Sun composed mainly of?

Accepted Answer

Hydrogen

Question 21

Why are humans affectingecosystems so much?

Accepted Answer

Do the same as other animals but to a greater degree

Question 22

An element has an atomic number of 68 a mass of 167.How many neutrons does it have?

Accepted Answer

99

Question 23

Which metal sinks in diesel (d = 0.83 g/cm3) but floats in olive oil (d = 0.91 g/cm3)?

Accepted Answer

Potassium (d = 0.86 g/cm3)

Question 24

Which of the following isthe most reactive metal?

Accepted Answer

Cesium

Grade 9 Science Exam review

Questions 24

Grade 9 Science Exam review

Questions 24