Unit B

Question 1

What does a yellow triangle safety symbol indicate?

Answer 1

Caution

Indicates a need for attention to potential hazards.

Question 2

What does an orange diamond safety symbol indicate?

Answer 2

Warning: 2g

Indicates a moderate level of danger.

Question 3

What does a red octagon safety symbol indicate?

Answer 3

Danger

Indicates a high level of risk or threat.

Question 4

What is indicated by the ‘Flame’ symbol?

Answer 4

Flammable substances

Represents materials that can easily catch fire.

Question 5

What does the ‘Exploding Bomb’ symbol signify?

Answer 5

Explosive hazards

Indicates materials that may explode under certain conditions.

Question 6

What does the ‘Exclamation Mark’ symbol indicate?

Answer 6

Chronic exposure may cause health effects

Represents substances that may cause long-term health risks.

Question 7

What does the ‘Biohazardous’ symbol indicate?

Answer 7

Infectious materials

Represents biological agents that can cause diseases in humans or animals.

Question 8

What does the ‘Health Hazard’ symbol represent?

Answer 8

May cause or suspected of causing cancer

Indicates potential carcinogenic effects.

Question 9

What does the ‘Gas Cylinder’ symbol indicate?

Answer 9

Compressed gases

Represents hazards associated with gas cylinders.

Question 10

What does the ‘Corrosion’ symbol signify?

Answer 10

Can cause corrosion to metals, skin, and eyes

Indicates materials that can damage living tissues and materials.

Question 11

What does the ‘Skull and Crossbones’ symbol indicate?

Answer 11

Can cause death with short exposure to small amounts

Represents highly toxic substances.

Question 12

Fill in the blank: A yellow triangle indicates _______.

Answer 12

Caution

Question 13

True or False: The red octagon symbol indicates a warning.

Answer 13

False

The red octagon indicates danger, not warning.

Question 14

What type of materials does the ‘Flame Over Circle’ symbol represent?

Answer 14

Oxidizing substances

Indicates materials that can cause or enhance combustion.

Question 15

What do physical properties describe?

Answer 15

A substance and never involve a change in a substance’s chemical composition

Physical properties are used to identify and categorize substances.

Question 16

What are the states of matter?

Answer 16

Solid, liquid, gas

These states represent different physical forms of matter.

Question 17

What is sublimation?

Answer 17

The transition of a substance from solid to gas without passing through the liquid phase

An example of sublimation is dry ice turning into carbon dioxide gas.

Question 18

What is melting?

Answer 18

The process of a solid turning into a liquid

Melting occurs when a substance reaches its melting point.

Question 19

What is freezing?

Answer 19

The process of a liquid turning into a solid

Freezing occurs when a substance reaches its freezing point.

Question 20

What is evaporation?

Answer 20

The process of a liquid turning into a gas

This process occurs at any temperature and involves molecules escaping from the liquid phase.

Question 21

What is condensation?

Answer 21

The process of a gas turning into a liquid

This occurs when gas molecules cool down and lose energy.

Question 22

What is deposition?

Answer 22

The transition of a substance from gas to solid without passing through the liquid phase

An example of deposition is frost forming on a cold surface.

Question 23

What are examples of characteristics used to describe a substance?

Answer 23

Colour, lustre, texture, smell, taste

These characteristics are part of the physical properties that help identify substances.

Question 24

Fill in the blank: Many physical properties can help us describe matter, including _______.

Answer 24

colour, lustre, texture, smell, taste

These are just a few examples of physical properties.

Question 25

What are elements?

Answer 25

Pure substances with only one type of atom.

Elements are the simplest form of matter and cannot be broken down into simpler substances.

Question 26

What are compounds?

Answer 26

Pure substances with only one type of molecule and different atoms inside each molecule.

Compounds are formed when two or more elements chemically combine.

Question 27

What is a common type of mixture used in chemistry?

Answer 27

Solutions (solids dissolved in a liquid).

Solutions are homogeneous mixtures where the solute is evenly distributed within the solvent.

Question 28

What happens during a chemical reaction that produces a suspension?

Answer 28

It contains an undissolved solid.

Suspensions are heterogeneous mixtures where particles are dispersed but not dissolved in the liquid.

Question 29

What is the undissolved solid in a suspension called?

Answer 29

Precipitate.

A precipitate forms when the concentration of a substance exceeds its solubility.

Question 30

Fill in the blank: Elements are pure substances with only one type of _______.

Answer 30

atom.

Question 31

Fill in the blank: Compounds are pure substances with only one type of _______ and different atoms inside each molecule.

Answer 31

molecule.

Question 32

True or False: All mixtures in chemistry are solutions.

Answer 32

False.

Mixtures can also be suspensions or colloids, not just solutions.