Chemistry Exam 02/16/2015

Question 1

Define homogeneous mixture

Answer 1

A mixture where the components that make up the mixture are UNIFORMLY distributed. You CANNOT identify the particles making up the mixture.

Question 2

Define suspension

Answer 2

AKA: Heterogeneous mixture where the components that make up the mixture are NOT uniformly distributed. You CAN identify the particles making up the mixture.

Question 3

Define solution

Answer 3

AKA: Homogeneous mixture A mixture where the components that make up the mixture are UNIFORMLY distributed. You CANNOT identify the particles making up the mixture.

Question 4

What’s the difference between soluble and insoluble?

Answer 4

Soluble means CAN dissolve; Insoluble means CANNOT dissolve

Question 5

If I took oil and water and put both into a bottle of water, would it be a homogeneous mixture, suspension, or a solution?

Answer 5

It would be a suspension because the oil and water are NOT uniformly distributed and you CAN identify the particles making up the mixture.

Question 6

If I took water and salt and put both into a bottle of water, would it be a homogeneous mixture, suspension, or a solution?

Answer 6

It would be best called a solution and a homogeneous mixture.

Question 7

Define emulsifying agent

Answer 7

A substance that helps an emulsion (a mixture of two products such as oil and water that do not mix together) become more stable by preventing the two from coming together.

Question 8

Define miscible

Answer 8

When things CAN be dissolved in one another

Question 9

Define immiscible

Answer 9

When things CANNOT be dissolved in one another

Question 10

Define solute

Answer 10

A substance (a thing) dissolved in a liquid (solvent)

Question 11

Define solvent

Answer 11

A liquid that is dissolving a substance (a solute)

Question 12

Define unsatured

Answer 12

A solution that can still dissolve more solute

Question 13

Define saturated

Answer 13

A solution that can no longer dissolve more solute (adding more solute will just sink to the floor)

Question 14

Define supersaturated

Answer 14

A solution that at one temperature could no longer dissolve more solute but its temperature was raised so that solubility increases therefore, it can dissolve more solute.

Question 15

Define polar

Answer 15

An uneven distribution of electrons in a bond between two atoms

Question 16

Define non-polar

Answer 16

An even distribution of electrons in a bond between atoms

Question 17

Define ionic

Answer 17

Atoms that have lost one or more electrons (known as cations) and atoms that have gained one or more electrons (known as an anion)

Question 18

Define hard water

Answer 18

Water that has high mineral content of divalent cations (ex. Mg +2, Fe +2, and Ca+2)

Question 19

Define soft water

Answer 19

Water that has low mineral content

Question 20

Define alloy

Answer 20

When two metals are mixed together

Question 21

Solubility

Answer 21

The amount of substance something can be dissolve in another subtance

Question 22

When will increasing temperature NOT increase solubility for a substance?

Answer 22

When the substance is a gas.

Question 23

For the most part, increasing temperature of a substance will (increase/decrease) the solubility.

Answer 23

Increase

Question 24

When it comes to determining if two things will dissolve, just remember that __________ dissolves _________.

Answer 24

Like dissolves like

Question 25

In a water softening unit, ____________ is passed through a large tank filled with tiny beads of water-insoluble resin known as _____________ .

Answer 25

In a water softening unit, __hard water__ is passed through a large tank filled with tiny beads of water-insoluble resin known as ___ion-exchange resin___ .

Question 26

The surface of the resin contains many __________ bound to positively charged Na+1 ions. As the hard water with its _____&_______ ions pass over the resin, the ions displace the sodium ions and thereby become bound to the resin.

Answer 26

The surface of the resin contains many __negatively charged ions__ bound to positively charged Na+1 ions. As the hard water with its Ca2+&Mg2+ ions pass over the resin, the ions displace the sodium ions and thereby become bound to the resin.

Question 27

The hard water that had entered now exits the unit free of _____&_______ but does contain Na+1 ions, thereby making it _______ water.

Answer 27

The hard water that had entered now exits the unit free of Ca2+&Mg2+ but does contain Na +1 ions, thereby making it soft water.