Activate 2 Chemistry Chapter 2

Question 1

What is chromatography?

Answer 1

A technique for separating mixtures based on how soluble a substance is.

Question 2

True or False: Chromatography can only be used for liquid mixtures.

Answer 2

False

Question 3

What are the two main types of chromatography?

Answer 3

Liquid chromatography and gas chromatography.

Question 4

Multiple Choice: Which of the following is NOT a type of chromatography? A) Paper B) Gas C) Solid D) Distillation

Answer 4

D) Distillation

Question 5

What is the primary use of chromatography in laboratories?

Answer 5

To separate and analyze components in a mixture.

Question 6

True or False: Distillation is a method for separating liquids based on their boiling points.

Answer 6

True

Question 7

Fill in the blank: The process of __________ involves converting a liquid into vapor and then back into liquid.

Answer 7

distillation

Question 8

What is one common application of distillation?

Answer 8

Purification of drinking water.

Question 9

Multiple Choice: Which of the following is a use of evaporation? A) Water purification B) Oil extraction C) Concentration of solutions D) All of the above

Answer 9

D) All of the above

Question 10

True or False: Evaporation occurs at a specific temperature.

Answer 10

False

Question 11

What is evaporation?

Answer 11

The process by which liquid turns into vapor at any temperature below its boiling point.

Question 12

Fill in the blank: Evaporation is a __________ process, meaning it absorbs heat from the surroundings.

Answer 12

cooling

Question 13

Multiple Choice: Which process is primarily used in the production of essential oils? A) Chromatography B) Distillation C) Evaporation D) All of the above

Answer 13

B) Distillation

Question 14

What is a key factor affecting the rate of evaporation?

Answer 14

Temperature and surface area.

Question 15

True or False: Chromatography and distillation can be used interchangeably.

Answer 15

False

Question 16

What type of chromatography uses a liquid mobile phase?

Answer 16

Liquid chromatography.

Question 17

Fill in the blank: The technique used to separate and purify liquids based on boiling points is called __________.

Answer 17

distillation

Question 18

What is a compound?

Answer 18

A compound is a substance formed when two or more elements are chemically bonded together.

Question 19

What is a mixture?

Answer 19

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Question 20

True or False: Compounds can be separated into their elements by physical methods.

Answer 20

False

Question 21

True or False: Mixtures retain the properties of their individual components.

Answer 21

True

Question 22

Fill in the blank: A __________ is a mixture that has a uniform composition throughout.

Answer 22

solution

Question 23

How can you tell if a substance is pure?

Answer 23

A pure substance has a straight boiling point.

Question 24

Which of the following is a characteristic of compounds? A) Variable composition B) Fixed composition C) Physical separation

Answer 24

B) Fixed composition

Question 25

Name one method to separate components of a mixture.

Answer 25

Filtration, distillation, or chromatography.

Question 26

True or False: All compounds are mixtures.

Answer 26

False

Question 27

What is an example of a compound?

Answer 27

Water (H2O) or sodium chloride (NaCl).

Question 28

What is an example of a mixture?

Answer 28

Air or salad.

Question 29

Fill in the blank: A __________ mixture has a composition that is the same throughout.

Answer 29

homogeneous

Question 30

Identify whether the following is a compound or a mixture: Carbon dioxide (CO2).

Answer 30

Compound

Question 31

Identify whether the following is a compound or a mixture: Oil and water.

Answer 31

Mixture

Question 32

What is the main difference in composition between a compound and a mixture?

Answer 32

Compounds have a fixed ratio of elements, while mixtures have variable proportions.

Question 33

True or False: The properties of a mixture can change based on the proportions of its components.

Answer 33

True

Question 34

What is the boiling point of a pure substance used for?

Answer 34

It is used to determine the purity of the substance.

Question 35

Multiple choice: Which of the following methods can be used to identify a pure substance? A) Melting point determination B) Color observation C) Smell test

Answer 35

A) Melting point determination

Question 36

What happens to the properties of a mixture when it is separated?

Answer 36

The individual properties of the components remain unchanged.

Question 37

What is a solvent?

Answer 37

The solvent is what dissolves the solute.

Question 38

What is a solute?

Answer 38

The solute is what dissolves in the solvent.

Question 39

What is a saturated solution?

Answer 39

A saturated solution is a solution which carries the maximum mass of a substance which will dissolve.

Question 40

What is solubility?

Answer 40

Solubility is the mass of a substance which will dissolve in 100g of water.

Question 41

What does the term 'soluble' mean?

Answer 41

It means that it will more easily dissolve than another substance.

Question 42

What does the term 'insoluble' mean?

Answer 42

Insoluble means that it will never dissolve in water.

Question 43

Can termperature affects solubility?

Answer 43

Yes, temperature can affect the solubility of a substance.

Question 44

Draw a diagram of filtration.

Answer 44

https://www.scribd.com/document/678864625/Science-Textbook-ACTIVATE-2 Go to page 82.

Question 45

Draw a diagram of distillation.

Answer 45

https://www.scribd.com/document/678864625/Science-Textbook-ACTIVATE-2 Go to page 85.

Question 46

Draw a diagram of chromatography.

Answer 46

https://www.scribd.com/document/678864625/Science-Textbook-ACTIVATE-2 Go to page 86.