Quiz 1 Density Determination & Separation of Mixtures

Question 1

Formula to find density

Answer 1

D=m/v

Question 2

How does an intensive property differ from an extensive property?

Answer 2

An intensive property is a property of matter that depends only on the type of matter in a sample and not the amount. An extensive property is a property that depends on the amount of matter in a sample.

Question 3

Example of intensive

Answer 3

Color/Hardness

Question 4

Example of extensive

Answer 4

Mass/Volue

Question 5

What measurements are needed to calculate the density of a solid or liquid sample?

Answer 5

The measurements of mall and volume are needed to calculate the identity.

Question 6

The volume of a fixed mass of a liquid sample increases as the temperature rises from 20 to 40 degrees Celsius. Does the density increase, decrease, or stay the same? Explain your answer.

Answer 6

The density of the liquid sample decreases with an increase in temperature. When the temperature increases, the volume of the liquid rises too. When things get warmer, they expand. The calculated density gets smaller when you divide the mass by a large volume.

Question 7

What is sublimation

Answer 7

Sublimation involves heating a solid until is passes directly from the solid phase in to the gaseous phase. Th reverse process, when the vapor goes back to the solid phase without a liquid state in between.

Question 8

Example of Sublimation

Answer 8

Dry ice, naphthalene

Question 9

What is extraction

Answer 9

This uses a solvent to selective dissolve one or more components from a solid mixture. With this technique, a soluble solid can be separated from an insoluble solid.

Question 10

Example of extraction

Answer 10

Brewing tea or coffee

Question 11

What is decantation

Answer 11

This separates a liquid from an insoluble solid sediment by carefully pouring the liquid from the solid without disturbing the solid.

Question 12

Example of decantation

Answer 12

Water and oil

Question 13

What is filtration

Answer 13

This separates a solid from a liquid through the use of a porous material as a filter. Paper, charcoal, or sand can serve as a filter. These materials allow the liquid to pass through but not the solid.

Question 14

Example of filtration

Answer 14

When making tea a filter is used to separate the leaves from the water.

Question 15

What is evaporation

Answer 15

This is the process of heating a mixture in order to drive off, in the form of vapor, a volatile liquid, so as to make the remaining component dry.

Question 16

Example of evaporation

Answer 16

Drying wet hair/ drying of big bodies of water…