Question

section 3.1 properties of matter
in your textbook, read about physical properties and chemical properties of matter.
use each of the terms below just once to complete the passage.
chemical, density, mass, properties, physical, substance
matter is anything with (1) mass and volume. a (2) substance is a form of matter with a uniform and unchanging composition. substances have specific, unchanging (3) properties that can be observed. substances have both physical and chemical properties. (4) physical properties can be observed without changing a substances chemical composition. color, hardness, and (5) density are examples. other properties cannot be observed without changing the composition of a substance. these are called (6) chemical properties. an example is the tendency of iron to form rust when exposed to air.
label each property as either physical or chemical.

1. chemical formula h₂o
2. forms green carbonate when exposed to moist air
3. remains unchanged when in the presence of nitrogen
4. colorless
5. solid at normal temperatures and pressures
6. ability to combine with another substance
7. melting point
8. liquid at normal temperatures and pressures
9. boiling point is 100°c
10. conducts electricity
11. density is $\frac{1g}{cm^3}$

Explanation:

Physical properties can be observed without changing the chemical composition of a substance (e.g., color, melting - point). Chemical properties are observed when the substance's composition changes (e.g., forming a new compound). For the chemical formula $H_2O$, it represents a chemical identity so is related to chemical property. Forming a new substance like green carbonate is a chemical change. Remaining unchanged in nitrogen is a physical - like observation. Colorless is a physical property. State at normal conditions (solid/liquid) is physical. Ability to combine is chemical. Melting and boiling points are physical. Conducting electricity and density are physical properties as they can be measured without changing the substance's chemical nature.

Answer:

1. C. Chemical property
2. C. Chemical property
3. P. Physical property
4. P. Physical property
5. P. Physical property
6. C. Chemical property
7. P. Physical property
8. P. Physical property
9. P. Physical property
10. P. Physical property
11. P. Physical property