Test 4: Solutions

Question 1

Whats a pure substance

Answer 1

Substance made up of only one type of particle (atom (Element) or molecule (compound)

Question 2

Whats a mixture

Answer 2

A combination of two or more substances/components mixed in a variety of proportions, comonents can be separated by physical means

Question 3

What type of mixture is a solution, why

Answer 3

Its a homogenous mixture because its physically combined (composition looks the same throughout) , made up of a solvent and solute

Question 4

Whats solubility

Answer 4

The ability of a substance (the solute) to dissolve in solvent/ the extent to which a substance may be dissolved

Question 5

What does it mean for something to be soluble

Answer 5

More than 0.1 Mol of salt will dissolve in 1.0L of solution, the solute particles can disperse evenly in the solvent

Question 6

What does it mean for something to have low solubility/ is insoluble

Answer 6

Insoluble doesnt mean it cant dissolve, everything dissolves to some extent, but a small amount dissolves and the rest remains undissolved and typically as a precipitate

Question 7

Whats a saturated solution

Answer 7

A solution that contains the maximum amount of solute that can be dissolved

Question 8

Whats an unsaturated solution

Answer 8

A solution in which more solute can be dissolved

Question 9

Which solutions are conductive and which arent, why

Answer 9

Ionic solutions dissociate in water to produce ions, which are charged particles therefore produce a conductive solution
Molecular solutions (covalent, organic compounds) that dissolve in water produce a nonconductive solution since they cannot dissociate (water cannot break them down because theyre nonpolar), stays as a whole molecule (just dispersed evenly in solvent)

Question 10

Whats the difference between dissolving and dissociating

Answer 10

Dissolving: breaking solution down into molecules, dispersed evenly in solvent
Dissociating: breaking molecules down into ions

Question 11

Is a highly soluble molecule always good at dissociating

Answer 11

No, because molecular solutions can dissolve well but cannot break into ions because theyre nonpolar, water cannot break them down more

Question 12

Can ionic compounds with low solubility dissociate

Answer 12

These ionic compounds can only slightly dissolve in water, but the particles that do dissolve still dissociate into ions, although most of the compound is now a solid precipitate

Question 13

What does diluting a solution do, what does it mean to dilute something

Answer 13

Causes the concentration of the solute to decrease
The process of adding more solvent to a solution

Question 14

Whats a standard and unknown solution

Answer 14

Solutions in a titration lab
Standard: the solution whose concentration is known
Unknown: the solution whose concentration is unknown