Chemistry

Question 1

Which subatomic particle is found in the nucleus and has no charge?

Answer 1

Neutron

Question 2

What method would best separate sand from water?

Answer 2

Filtration

Question 3

An aqueous solution always contains:

Answer 3

Water

Question 4

What is a compound?

Answer 4

A compound is a substance made from two or more different elements chemically bonded together in a fixed ratio.

Question 5

In which state of matter are particles tightly packed and only vibrate?

Answer 5

Solid

Question 6

Name the three subatomic particles and describe their charges.

Answer 6

Proton: Positive
Neutron: Neutral
Electron: Negative

Question 7

Define: Element

Answer 7

A pure substance made of only one type of atom.

Question 8

Define: Mixture

Answer 8

A combination of two or more substances that are not chemically bonded.

Question 9

Define: Compound

Answer 9

A substance made from two or more elements chemically bonded.

Question 10

Example of a colloid?

Answer 10

Milk

Question 11

Example of a solution?

Answer 11

Salt water

Question 12

What does ‘aqueous’ mean in chemistry?

Answer 12

Dissolved in water

Question 13

What is chromatography used for?

Answer 13

Separating components of a mixture based on how they travel through a medium

Question 14

The ____________ of an atom contains protons and neutrons.

Answer 14

Nucleus

Question 15

A homogeneous mixture where one substance is dissolved in another is called a ____________.

Answer 15

Solution

Question 16

In a colloid, particles are ____________ enough to stay suspended but not dissolved.

Answer 16

Small

Question 17

When ice melts, it changes from a ____________ to a ____________.

Answer 17

Solid → Liquid

Question 18

What is an aqueous solution?

Answer 18

A solution where water is the solvent

Question 19

What is ionisation?

Answer 19

Formation of ions by gaining or losing electrons

Question 20

Sublimation is…

Answer 20

When a solid changes directly to a gas

Question 21

Recombination occurs when…

Answer 21

Ions and electrons form neutral atoms

Question 22

Average atmospheric pressure at sea level?

Answer 22

101.3 kPa

Question 23

Instrument used to measure pressure?

Answer 23

Barometer

Question 24

Define temperature.

Answer 24

A measure of the average kinetic energy of particles in a substance

Question 25

Define pressure.

Answer 25

Force applied per unit area

Question 26

Difference between homogeneous and heterogeneous mixtures?

Answer 26

Homogeneous: Uniform composition throughout Heterogeneous: Visibly different substances or phases

Question 27

What is the Tyndall Effect?

Answer 27

The Tyndall effect is the scattering of light by tiny particles in a colloid or in very fine suspensions. When a beam of light passes through such a mixture, the light is scattered by the particles, making the path of the beam visible.