Unit B Flashcards
What does a yellow triangle safety symbol indicate?
Caution
Indicates a need for attention to potential hazards.
What does an orange diamond safety symbol indicate?
Warning: 2g
Indicates a moderate level of danger.
What does a red octagon safety symbol indicate?
Danger
Indicates a high level of risk or threat.
What is indicated by the ‘Flame’ symbol?
Flammable substances
Represents materials that can easily catch fire.
What does the ‘Exploding Bomb’ symbol signify?
Explosive hazards
Indicates materials that may explode under certain conditions.
What does the ‘Exclamation Mark’ symbol indicate?
Chronic exposure may cause health effects
Represents substances that may cause long-term health risks.
What does the ‘Biohazardous’ symbol indicate?
Infectious materials
Represents biological agents that can cause diseases in humans or animals.
What does the ‘Health Hazard’ symbol represent?
May cause or suspected of causing cancer
Indicates potential carcinogenic effects.
What does the ‘Gas Cylinder’ symbol indicate?
Compressed gases
Represents hazards associated with gas cylinders.
What does the ‘Corrosion’ symbol signify?
Can cause corrosion to metals, skin, and eyes
Indicates materials that can damage living tissues and materials.
What does the ‘Skull and Crossbones’ symbol indicate?
Can cause death with short exposure to small amounts
Represents highly toxic substances.
Fill in the blank: A yellow triangle indicates _______.
Caution
True or False: The red octagon symbol indicates a warning.
False
The red octagon indicates danger, not warning.
What type of materials does the ‘Flame Over Circle’ symbol represent?
Oxidizing substances
Indicates materials that can cause or enhance combustion.
What do physical properties describe?
A substance and never involve a change in a substance’s chemical composition
Physical properties are used to identify and categorize substances.
What are the states of matter?
Solid, liquid, gas
These states represent different physical forms of matter.
What is sublimation?
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.
What is melting?
The process of a solid turning into a liquid
Melting occurs when a substance reaches its melting point.
What is freezing?
The process of a liquid turning into a solid
Freezing occurs when a substance reaches its freezing point.
What is evaporation?
The process of a liquid turning into a gas
This process occurs at any temperature and involves molecules escaping from the liquid phase.
What is condensation?
The process of a gas turning into a liquid
This occurs when gas molecules cool down and lose energy.
What is deposition?
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.
What are examples of characteristics used to describe a substance?
Colour, lustre, texture, smell, taste
These characteristics are part of the physical properties that help identify substances.
Fill in the blank: Many physical properties can help us describe matter, including _______.
colour, lustre, texture, smell, taste
These are just a few examples of physical properties.
What are elements?
Pure substances with only one type of atom.
Elements are the simplest form of matter and cannot be broken down into simpler substances.
What are compounds?
Pure substances with only one type of molecule and different atoms inside each molecule.
Compounds are formed when two or more elements chemically combine.
What is a common type of mixture used in chemistry?
Solutions (solids dissolved in a liquid).
Solutions are homogeneous mixtures where the solute is evenly distributed within the solvent.
What happens during a chemical reaction that produces a suspension?
It contains an undissolved solid.
Suspensions are heterogeneous mixtures where particles are dispersed but not dissolved in the liquid.
What is the undissolved solid in a suspension called?
Precipitate.
A precipitate forms when the concentration of a substance exceeds its solubility.
Fill in the blank: Elements are pure substances with only one type of _______.
atom.
Fill in the blank: Compounds are pure substances with only one type of _______ and different atoms inside each molecule.
molecule.
True or False: All mixtures in chemistry are solutions.
False.
Mixtures can also be suspensions or colloids, not just solutions.
