1. How can you identify extensive and intensive properties?
An extensive property is a property that depends on the amount of matter in a sample. Mass and volume are examples of extensive properties.
An intensive property is a property that depends on the type of matter in a sample, not the amount of matter.
Every sample of a pure substance has identical intensive properties because every sample has the same composition. Hardness, color, conductivity, and malleability are examples of intensive properties.
1. Identify A student measures out a sample of sucrose (table sugar) for an experiment. What are some extensive properties of the sample? What are some intensive properties of the sample?

2. How can you differentiate between physical and chemical changes?
During a physical change, some properties of a material change, but the composition of the material does not change.
Examples of reversible physical change include melting, freezing, boiling, condensing, and evaporating.
Examples of irreversible physical change include breaking, splitting, grinding, crushing, and cutting.
2. Describe List some common physical changes that take place when you cook a meal. Identify which changes are reversible and which are irreversible.
(contd.)

3. Chemical properties can be observed only when a chemical change occurs.
During a chemical change, the composition of matter always changes. A chemical change is also called a chemical reaction.
Possible clues to chemical change include a transfer of energy, a change in color, the production of a gas, and the formation of a precipitate.
3. Describe List some chemical changes that take place when you cook a meal. For each change, describe observable clues to support the conclusion that a chemical change is occurring.