Solutions and Solubility pt 2

Question 1

True or False: Dissolving an ionic compound is a more complex process than melting the compound

Answer 1

True

Question 2

Melting can be considered as doing what to ionic lattice and why?

Answer 2

Melting can be considered as breaking apart the ionic lattice to produce freely mobile ions.

Question 3

What do we use to describe lattice energy?

Answer 3

Coulomb’s Law

Question 4

What is Coulomb’s Law?

Answer 4

U = constant × (Q1Q2/d)

Question 5

True or False: Breaking bonds always require an input of energy and is therefore an endothermic process (energy absorbed).

Answer 5

True

Question 6

Breaking bonds is what type of process?

Answer 6

Endothermic

Question 7

True or False: Hence, melting of any substance is always an endothermic process.

Answer 7

True

Question 8

True or False: Ionic compounds with stronger bonds (compounds that contain small, highly charged ions) require a greater amount of energy to separate the anions and cations and therefore have higher melting points.

Answer 8

True

Question 9

What is an energy-releasing process as solvent molecules surround and interact with the anions and cations?

Answer 9

Solvation/hydration when water is the solvent

Question 10

What is the energy of attraction between cations (or anions) and water/solvent?

Answer 10

Solvation energy

Question 11

True or False: Whenever energy is released during a chemical or physical change, the process is described as an exothermic process (energy released).

Answer 11

True

Question 12

What kind of process is it whenever energy is released during a chemical or physical change?

Answer 12

Exothermic process

Question 13

What is true for an ionic substance to dissolve?

Answer 13

For an ionic substance to dissolve, the anion-cation attractions must be disrupted while new water-ion attractions form.

Question 14

True or False: The lattice energy of the ionic compound is often comparable to the solvation energy. Therefore, dissolving is usually either a slightly endothermic or slightly exothermic process overall as the solvation (exothermic) and lattice bond breaking (endothermic) steps almost cancel each other out.

Answer 14

True

Question 15

What is solubility?

Answer 15

A measure of how much salt with dissolve in a given amount of water

Question 16

Salts are often described as being what?

Answer 16

Soluble or insoluble

Question 17

True or False: Given enough water, a small amount of any salt will be soluble

Answer 17

True

Question 18

True or False: Given enough salt in a small amount of water, any salt will precipitate.

Answer 18

True

Question 19

What is a notable observation of the Phet simulation?

Answer 19

The amount of ions dissolved stays relatively constant, but more ions are in the bound state

Question 20

What does it mean to be static?

Answer 20

Unchanging

Question 22

What are crystals?

Answer 22

Solids with a regular arrangement of atoms

Question 22

What does it mean to be dynamic?

Answer 22

Continuously changing