Question

1. which property allows graphite in pencils to leave marks on paper?

• a. transparency
• b. malleability
• c. brittleness
• d. conductivity

1. what physical property allows metals to be formed into wires?

• a. ductility
• b. flammability
• c. reactivity
• d. toxicity

1. which of the following is a chemical property?

• a. transparency
• b. color
• c. reactivity
• d. mass

1. which statement is true about physical properties?

• a. they cannot be observed without chemical changes
• b. they describe how a substance reacts.
• c. they can be observed with the five senses.
• d. they always change the substances composition.

1. which property is important for making windows?

• a. conductivity
• b. transparency
• c. brittleness
• d. ductility

1. flammability is an example of:

• a. physical property
• b. intensive property
• c. chemical property
• d. extensive property

1. the freezing point of water is an example of:

• a. chemical property
• b. intensive property
• c. extensive property
• d. ductility

1. which property is observed when a metal is shaped into a chair?

• a. malleability
• b. conductivity
• c. flammability
• d. reactivity

1. which of the following is not a physical property?

• a. smell
• b. texture
• c. flammability
• d. melting point

Explanation:

1. Graphite leaves marks because it breaks into small layers easily, which is brittleness.
2. Metals formed into wires rely on ductility, the ability to be drawn into thin wires.
3. Reactivity describes how a substance changes chemically, so it is a chemical property.
4. Physical properties can be observed using sight, touch, smell, taste, or sound without altering the substance's composition.
5. Windows need to let light pass through, which is transparency.
6. Flammability involves a substance undergoing a chemical reaction (burning), so it is a chemical property.
7. The freezing point of water does not depend on the amount of water, so it is an intensive property.
8. Shaping metal into a chair involves hammering or bending it into a new shape, which is malleability.
9. Flammability requires a chemical change to observe, so it is not a physical property.

Answer:

1. C. Brittleness
2. A. Ductility
3. C. Reactivity
4. C. They can be observed with the five senses.
5. B. Transparency
6. C. Chemical property
7. B. Intensive property
8. A. Malleability
9. C. Flammability