Question

1. which physical property of matter describes the relationship between

mass and volume?
a. density
b. ductility
c. reactivity
d. weight

1. souring milk is an example of a

a. physical property.
b. physical change.
c. chemical property.
d. chemical change.

1. malleability is an example of a

a. physical property.
b. physical change.
c. chemical property.
d. chemical change.

Explanation:

Question 10

To solve this, we recall the definitions of each option:

• Density: Defined as mass per unit volume ($

ho = \frac{m}{V}$), so it describes the relationship between mass and volume.

• Ductility: Ability to be drawn into wires, not related to mass - volume.
• Reactivity: How a substance reacts chemically, not related to mass - volume.
• Weight: Force due to gravity ($W = mg$), related to mass and gravity, not volume.

• Physical property: Characteristic without changing substance, e.g., color. Souring milk is a change, not a property, so a and c are out.
• Physical change: Change in form, not substance (e.g., melting ice). Souring milk involves new substances (like lactic acid) forming.
• Chemical change: Change where new substances form. Souring milk is a chemical change as it involves a chemical reaction (fermentation) producing new compounds.

• Physical property: Characteristic of a substance without changing its chemical identity. Malleability is the ability to be hammered into sheets, a physical characteristic (no new substance formed).
• Physical change: A change in form (e.g., breaking glass), malleability is a property, not a change.
• Chemical property: Related to chemical reactions (e.g., flammability), malleability is physical.
• Chemical change: Involves new substances, malleability is a property, not a change.

Answer:

a. density

Question 11