Question

1. which of the following is an example of a physical change, but not a chemical change?

a) a water pipe freezes and cracks on a cold night
b) a penny is left outside slowly turns green
c) a log gives off light and heat as it burns
d) a tree stores energy from the sun in its fruit

1. which of the following examples depict(s) a physical property?

a) sugar is white in color
b) iron is more dense than aluminum
c) diamond is harder than graphite
d) all of the above

1. true or false - the melting point, boiling point, and freezing point of a substance can be determined easily and exactly and are known as the physical properties.
2. true or false - the color of most metals is silver, while most gases are colorless.
3. true or false - brittleness, malleability, ductility, and viscosity fall into the category of physical properties of matter.
4. yes or no - titanium is softer than gold.
5. which of the following involves a change in the physical properties of the original substance?

a) sublimation of camphor c) formation of dew
b) clotting of blood d) both a and c

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

a) boiling point c) hardness
b) flammability d) color

1. color and shape both are examples of chemical or physical properties.

Explanation:

• Question 1: A physical change involves a change in state or form without altering the chemical composition. Freezing of water (a) is a physical change as it's just a state change (liquid to solid). Penny turning green (b) is a chemical change (oxidation). Log burning (c) is a chemical change (combustion). Tree storing energy (d) involves photosynthesis (chemical change).
• Question 2: Physical properties are characteristics that can be observed without changing the substance's chemical identity. Color (a), density (b), and hardness (c) are all physical properties. So, all of the above (d) is correct.
• Question 3: Melting point, boiling point, and freezing point are indeed physical properties as they describe the physical state changes of a substance and can be measured easily. So, the statement is True.
• Question 4: Most metals have a silver - like color (e.g., iron, aluminum), and most gases (e.g., oxygen, nitrogen) are colorless. So, the statement is True.
• Question 5: Brittleness (how easily a substance breaks), malleability (ability to be hammered into thin sheets), ductility (ability to be drawn into wires), and viscosity (resistance to flow) are all physical properties. So, the statement is True.
• Question 6: Titanium is harder than gold. So, the answer is No.
• Question 7: Sublimation of camphor (a) is a physical change (solid to gas). Formation of dew (c) is condensation (gas to liquid), also a physical change. Clotting of blood (b) is a chemical change (involves complex biochemical reactions). So, both A and C (d) is correct.
• Question 8: Boiling point (a), hardness (c), and color (d) are physical properties. Flammability (b) is a chemical property as it describes how a substance reacts with oxygen (burns).
• Question 9: Color and shape can be observed without changing the chemical composition of a substance. So, they are physical properties.

Answer:

1. A. A water pipe freezes and cracks on a cold night
2. D. All of the above
3. True
4. True
5. True
6. No
7. D. Both A and C
8. B. Flammability
9. Physical properties