A1.2 - properties and classification of matter

Question 1

What physical properties are used to classify substances?

Answer 1

Boiling point, melting point, Malleability, Ductility, Color, State, Solubility, Crystal formation, Conductivity, Magnetism

Question 2

What chemical properties are used to classify substances?

Answer 2

Ability to burn, flash point, behavior in air, behavior with water, behavior with acids, reaction to heat, reaction to red and blue litmus

Question 3

What is a pure substance?

Answer 3

All the particles that make up the substance are identical, so it’s chemical/physical properties are consistent (can be an element or a compound)

Question 4

What is a mixture?

Answer 4

A combination of two or more pure substances (properties are not consistant)

Question 5

What is a homogenous mixture and heterogeneous mixture?

Answer 5

Homogenous - Separate substances are not visible, also known as a solution
Heterogeneous - Mechanical mixture, suspension mixture, colloid mixture

Question 6

What are mechanical, suspension and colloid mixtures?

Answer 6

Mechanical - Different substances are visible (soil)
Suspension - Substances are a different state and particles will separate (mud = dirt and water)
Colloid - Suspension, but particles stay mixed (milk)

Question 7

What is a chemical reaction?

Answer 7

A process that occurs when a substance(s) react to create a new substance with their own physical and chemical properties (Energy is always released or absorbed during a chemical reaction)

Question 8

What are the two types of observations?

Answer 8

Quantitative - can be measured (weighing mass)
Qualitative - Describes a change (color change)

Question 9

What are the two types of interpretation?

Answer 9

Empirical knowledge - Observable knowledge, observations
Theoretical knowledge - Explains and describes observations, not observable