Chemistry

Question 1

What is the importance of lab safety in chemistry?

Answer 1

Lab safety is crucial to prevent accidents and ensure a safe working environment.

Question 2

How do you read a thermometer?

Answer 2

You read the temperature from the top of the red line (the line may be a different colour).

Question 3

How do you read a measuring cylinder?

Answer 3

You read from the bottom of the curve.

Question 4

What is the use of a Bunsen burner?

Answer 4

A Bunsen burner is used for heating substances.

Question 5

What is a beaker used for?

Answer 5

A beaker is used to store substances.

Question 6

What is the function of a tripod and gauze?

Answer 6

They are used to place things above a Bunsen burner.

Question 7

What is a conical flask used for?

Answer 7

A conical flask is used to store substances during heating.

Question 8

What is the purpose of an evaporating dish?

Answer 8

An evaporating dish is used to store evaporating liquids.

Question 9

What is the function of a funnel?

Answer 9

A funnel is used to pour things in a set area.

Question 10

How do impurities affect melting and boiling points?

Answer 10

Most impurities change a matter’s properties.

Question 11

What are the states of matter in order of particle energy?

Answer 11

Gas, liquid, solid.

Question 12

What defines a solid?

Answer 12

A solid has all atoms in a rigid joined position with strong bonds, regular order, fixed position, and closely packed.

Question 13

What defines a liquid?

Answer 13

A liquid has all atoms joined but they can flow past each other with weak bonds and no order.

Question 14

What defines a gas?

Answer 14

A gas has no restrictions, no bonds, and moves freely far apart.

Question 15

What is melting?

Answer 15

The process of changing from solid to liquid.

Question 16

What is boiling?

Answer 16

The process of changing from liquid to gas.

Question 17

What is condensing?

Answer 17

The process of changing from gas to liquid.

Question 18

What is freezing?

Answer 18

The process of changing from liquid to solid.

Question 19

What is sublimation?

Answer 19

The process of changing from solid to gas.

Question 20

What is deposition?

Answer 20

The process of changing from gas to solid.

Question 21

What three elements are needed for a fire to burn?

Answer 21

Oxygen, fuel, and heat.

Question 22

How do you extinguish a fire?

Answer 22

By removing one of the three elements: oxygen, fuel, or heat.

Question 23

What safety equipment should be worn when using a Bunsen burner?

Answer 23

Always wear eye protection.

Question 24

What is total combustion?

Answer 24

Total combustion happens when a fire burns an item with no remains or waste.

Question 25

What is simple distillation?

Answer 25

A method that heats a mixture to a certain temperature to boil and separate elements.

Question 26

How do you separate rock salt?

Answer 26

Grind large crystals of impure rock salt, mix with warm water, then filter and evaporate until crystals appear.

Question 27

What is chromatography?

Answer 27

A method of separating coloured substances into their components based on different speeds in a solvent.

Question 28

What are eluents?

Answer 28

Solvents such as water, propane, ethanol, and butanol used in chromatography.

Question 29

What is fractional distillation of crude oil?

Answer 29

Heating crude oil before condensing and separating it based on different boiling points.

Question 30

What are some uses of crude oil fractions?

Answer 30

Bottle gas, petrol, lighter fuel, kerosene, and more.

Question 31

What is an environmental aspect of crude oil?

Answer 31

It is harmful to the environment.

Question 32

How can you separate immiscible liquids?

Answer 32

Using dispersants, bioremediation, mechanical extraction, bioprocesses, or a separating funnel.

Question 33

How do you make indicators?

Answer 33

Boil red cabbage or beetroot in water and use the water with the juices as your indicator.

Question 34

How do you use indicators?

Answer 34

Mix the indicator with a substance and use a key to determine the pH from the colour.

Question 35

What is the pH scale?

Answer 35

A scale from 1-14 where lower values are more acidic and higher values are more alkaline.

Question 36

What is neutralization?

Answer 36

The process of neutralizing the pH of an acid or alkaline by adding the other.