Question

multiple choice
write the letter of the correct answer on the line at the left.

1. which of the following is a characteristic property of an element?

a. boiling point
b. shape
c. volume
d. weight

1. a cubic centimeter is a unit for measuring

a. length.
b. volume.
c. mass.
d. density.

1. how is iron usually separated from its ores?

a. by electrolysis
b. by making use of its high density
c. by panning it
d. by heating iron ore and a source of carbon

1. which of the following is not a characteristic of a compound?

a. has different properties from the elements that formed it
b. is a pure substance
c. different samples have different properties
d. can be represented by a formula

1. an unchanging measurement of the amount of matter an object contains is its

a. mass.
b. density.
c. volume.
d. length.

1. characteristic properties for a substance

a. depend on volume.
b. depend on temperature.
c. never change.
d. differ on different planets.

1. a(n) ____________ is a well - blended mixture that appears to be a single substance.

a. compound
b. element
c. pure substance
d. solution

Explanation:

1. Boiling point is a characteristic property of an element as it is unique to each element. Shape, volume, and weight can vary depending on the sample and conditions.
2. A cubic - centimeter is a unit for measuring volume. It is used to quantify the amount of space an object occupies.
3. Iron is usually separated from its ores by heating iron ore and a source of carbon in a blast furnace through a process called smelting.
4. Compounds are pure substances with properties different from the elements that formed them and can be represented by a formula. Different samples of the same compound have the same properties.
5. Mass is an unchanging measurement of the amount of matter an object contains. It is independent of location and other factors like volume, density, or length.
6. Characteristic properties for a substance never change under the same conditions. They are used to identify substances and are not dependent on volume, temperature (in a general sense for characteristic properties), or location (like different planets).
7. A solution is a well - blended mixture that appears to be a single substance. It is homogeneous at the molecular level.

Answer:

1. a. boiling point
2. b. volume
3. d. by heating iron ore and a source of carbon
4. c. different samples have different properties
5. a. mass
6. c. never change
7. d. solution