Question

Part A: Identifying a Substance, Mixture, Element, Compounds, Heterogeneneous, Homogeneous

Directions: Classify each of the following as to whether it is a substance or a mixture. If it is a substance, write Element or Compound. If it is a mixture, write Heterogeneous or Homogeneous.

Type of Matter

1. Chlorine

2. Water

3. Soil

4. Sugar water

5. Carbon dioxide

6. Pure air

Part B: Physical versus Chemical Properties

Directions: Classify the following properties as either chemical or physical by writing a C or a P.

A physical property is observed with the senses and can be determined without destroying the object. For example, color, shape, mass, length and odor are all examples of physical properties.

A chemical property indicates how a substance reacts with something else. The original substance is fundamentally changed in observing a chemical property. For example, the ability of iron to rust is a chemical property. The iron has reacted with oxygen, and the original iron metal is changed. It now exists as iron oxide, a different substance.

1. blue color

2. density

3. flammability

4. solubility

5. melting point
6. reacts with water to form a gas

7. reacts with a base to from water

8. can neutralize a base
9. luster

10. odor

Part C: Physical versus Chemical Changes

Directions: Classify the following as being a physical or chemical change

In a physical change, the original substance still exists, it has only changed in form. In a chemical change, a new substance is produced. Energy changes always accompany chemical changes.

1. Hydrochloric acid reacts with potassium hydroxide to produce salt, water and heat.

2. A pellet of sodium is sliced in two

3. Water is heated and changed to steam

4. Potassium chlorate decomposes to potassium chloride and oxygen gas

5. Iron rusts

6. When placed in H2O, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms

7. Evaporation

8. Milk sours

9. Sugar dissolves in water

10. Wood rotting

11. Grass growing in a lawn

12. Food is digested in the stomach

Answer 1

Answer: Part A: Identifying a Substance, Mixture, Element, Compounds, Heterogeneneous, Homogeneous

Chlorine: Substance, Element

Water: Substance, Compound

Soil: Mixture, Heterogeneous

Sugar water: Mixture, Homogeneous

Carbon dioxide: Substance, Compound

Pure air: Mixture, Homogeneous

Part B: Physical versus Chemical Properties

blue color: P (Physical)

density: P (Physical)

flammability: C (Chemical)

solubility: P (Physical)

melting point: P (Physical)

reacts with water to form a gas: C (Chemical)

reacts with a base to form water: C (Chemical)

can neutralize a base: C (Chemical)

luster: P (Physical)

odor: P (Physical)

Part C: Physical versus Chemical Changes

Hydrochloric acid reacts with potassium hydroxide to produce salt, water and heat: Chemical change

A pellet of sodium is sliced in two: Physical change

Water is heated and changed to steam: Physical change

Potassium chlorate decomposes to potassium chloride and oxygen gas: Chemical change

Iron rusts: Chemical change

When placed in H2O, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms: Chemical change

Evaporation: Physical change

Milk sours: Chemical change

Sugar dissolves in water: Physical change

Wood rotting: Chemical change

Grass growing in a lawn: Chemical change

Food is digested in the stomach: Chemical change