Question

1. an element has a fixed composition because it contains only one type of
2. the substances in a

mixture are evenly distributed throughout.

1. if a spoon gets hot quickly when used to stir soup, it is probably made of
2. the melting point of nitrogen is °c and the boiling point is °c.
3. is a process that can separate dissolved particles from a liquid in a solution.
4. a change occurs when a material changes size/shape but composition does not.
5. properties can be observed only when substances are changing into others.
6. a solid that forms and separates from a liquid mixture is a
7. a cake rises as it bakes because a chemical change produces

section 3: short answer
answer in complete sentences.

1. how do the properties of a compound compare to the properties of the elements it contains?
2. how is the composition of a substance different from the composition of a mixture?

Explanation:

Step1: Recall element definition

An element has a fixed composition because it contains only one type of atom.

Step2: Recall mixture type

The substances in a homogeneous mixture are evenly distributed throughout.

Step3: Recall heat - conducting material

If a spoon gets hot quickly when used to stir soup, it is probably made of metal.

Step4: Recall nitrogen's phase - change points

The melting point of nitrogen is - 210°C and the boiling point is - 195.8°C.

Step5: Recall separation process

Evaporation or distillation is a process that can separate dissolved particles from a liquid in a solution.

Step6: Recall change type

A physical change occurs when a material changes size/shape but composition does not.

Step7: Recall property type

Chemical properties can be observed only when substances are changing into others.

Step8: Recall solid - formation term

A solid that forms and separates from a liquid mixture is a precipitate.

Step9: Recall cake - rising cause

A cake rises as it bakes because a chemical change produces gas.

Step10: Answer short - answer 1

The properties of a compound are different from the properties of the elements it contains. Compounds have unique physical and chemical properties due to the chemical bonds between atoms of different elements. For example, hydrogen and oxygen are gases, but when combined chemically to form water, it is a liquid with its own set of properties like a specific boiling point, density etc.

Step11: Answer short - answer 2

The composition of a substance (either an element or a compound) has a fixed ratio of atoms or a single - type of atom in the case of an element. In a mixture, the substances are just physically combined and can be present in varying ratios. For example, in a salt - water mixture, the amount of salt and water can vary, but in sodium chloride (a compound), the ratio of sodium to chlorine atoms is always 1:1.

Answer:

1. atom
2. homogeneous
3. metal
4. - 210; - 195.8
5. Evaporation (or distillation)
6. physical
7. Chemical
8. precipitate
9. gas
10. The properties of a compound are different from the properties of the elements it contains because compounds have unique physical and chemical properties due to chemical bonding.
11. The composition of a substance (element or compound) has a fixed ratio of atoms or single - type of atom, while in a mixture substances are physically combined and can be in varying ratios.