Question

part b - properties of matter

1. identify whether each is a physical or chemical property:

a) melting point of ice
b) flammability of gasoline
c) density of gold
d) rusting of iron

1. define density and write the formula. then calculate: a block has a mass of 120 g and a volume of 40 cm³.

Explanation:

Step1: Define physical and chemical properties

Physical properties can be observed or measured without changing the substance's chemical identity. Chemical properties are observed when a substance undergoes a chemical change.

Step2: Analyze melting point of ice

Melting ice only changes its state from solid to liquid without altering its chemical composition (still H₂O). So it's a physical property.

Step3: Analyze flammability of gasoline

Flammability involves gasoline burning, which is a chemical reaction (combustion) changing its chemical nature. So it's a chemical property.

Step4: Analyze density of gold

Density of gold is a measure of mass per unit volume and can be determined without changing gold's chemical identity. So it's a physical property.

Step5: Analyze rusting of iron

Rusting of iron is a chemical reaction (oxidation) where iron reacts with oxygen to form iron - oxide, changing its chemical composition. So it's a chemical property.

Answer:

a) Physical
b) Chemical
c) Physical
d) Chemical