Properties and States of Matter

Every sample of a given substance has the same properties because:

• they are made of the same atoms and molecules.

• they have different chemical compositions.

• they are found in different states of matter.

• they have varying densities.

The composition of an element is fixed because:

• elements are made of atoms with the same number of protons.

• elements can have different numbers of neutrons.

• elements can form compounds with other elements.

• elements can exist in different states of matter.

The composition of a compound is described by its:

• chemical formula

• physical state

• color

• density

The properties of a mixture can vary because:

• the components are chemically combined.

• the components are physically combined.

• the components are in fixed proportions.

• the components are identical.

Mixtures can be classified as solutions, suspensions, or colloids based on:

• the size of their particles

• their color

• their taste

• their temperature

If you added salt instead of sugar to a pitcher of lemonade, how would this change the properties of the lemonade?

• The lemonade would taste sweet.

• The lemonade would taste salty.

• The lemonade would taste sour.

• The lemonade would taste bitter.

Which of the following lists contains seven examples of physical properties?

• Color, odor, melting point, boiling point, density, solubility, hardness

• Color, taste, reactivity, flammability, density, solubility, hardness

• Color, odor, reactivity, flammability, density, solubility, hardness

• Color, taste, melting point, boiling point, reactivity, solubility, hardness

Three uses of physical properties are:

• Identifying substances, determining state changes, and measuring density

• Cooking, cleaning, and painting

• Driving, flying, and sailing

• Reading, writing, and speaking

Two processes that are used to separate mixtures are:

• Filtration and Evaporation

• Melting and Freezing

• Condensation and Sublimation

• Oxidation and Reduction

When you describe a liquid as thick, are you saying that it has a high or a low viscosity?

• High viscosity

• Low viscosity