guess what? UNIT 4(?) test

Question 1

what is an equivalence point?

Answer 1

when the H+ ions = OH- ions

Question 2

is the equivalance point always at pH = 7?

Answer 2

nope

Question 3

what equation do you use for titration stoich?

Answer 3

STEP 1. CONVERT VOLUME TO L

Cknown –xVknown–>nknown–mole ratio–>nunknown–/Vunknown–>Cunknown (but now it is known. funny how that works.)

Question 4

how to find pH on calculator. actually, these will probs be given, dont zero in on this.

Answer 4

pH = - log^[h+]

Question 5

how to find h+ ions on calc?

Answer 5

10^[-pH]

Question 6

how is strength measured through the pH scale? ie from 1 to 2 compared to 1 to 3

Answer 6

every number is 10X stronger than the one before it. H+ ions in something pH 1 = 0.1.
H+ has the same amount of 0 as there are numbers in the pH scale. like 3 has 3 zeros, 0.001. its pretty nifty.

Question 7

how do you do solution stoich?

Answer 7

1. convert volume to liters. (this step is very important)
2. divide mass by known concentration
3. can we get a ‘What! what!’ for a MOLE RATIO
4. c=n/v

Question 8

what do chemists do in plays?

Answer 8

they actinium

Question 9

what is solubility?

Answer 9

the amount of solute that will dissolve in a given amount of solute at a given temperature.

Question 10

when a solute dissolves in a solvent, what is true abt their attractions?

Answer 10

the solute attractions are less than that of the solvent.

Question 11

how does taste change from acid to base

Answer 11

acids are sour bases are bitter

Question 12

how does feel change from acid to base

Answer 12

acids have no characteristic feel, bases are slippery

Question 13

how does the colour of phenothalein change from acid to base

Answer 13

acids are colourless, bases are magenta

Question 14

how does conductivity change from acid to base

Answer 14

it doesnt change, both are conductive

Question 15

how does metal reactivity change from acids to bases?

Answer 15

it doesnt change, both react with metal.

Question 16

ni=nf, therefore…

Answer 16

CiVi=CfVf

Question 17

true or fasle: bases are proton donors

Answer 17

whoopsie its false ur thinking about acids u dummy. bases are proton receptors.

Question 18

hydrogen bonding

Answer 18

its FON! hydrogen bonds form when hydrogen bonds to flourine, oxygen, and nitrogen… also makes dissolving harder, not fon.

Question 19

solubility in covalent compounds

Answer 19

polar molecules dissolve in polar solvents and vice versa.

Question 20

solubility in ionic compounds

Answer 20

for an ionic substance to dissolve, water must have stronger attractions to ions than htey have to themselves.

Question 21

what are factors that affect solubility?

Answer 21

• size, smaller molecles dissolve easier
• temp, higher temp makes more energy to help break attractions
• pressure, increaseing pressure in gas solutes increases solubility because gas is forced into solution

Question 22

what is concentration?

what is a part per million?

Answer 22

amount of stuff / unit of space

the same as 1 mg in 1 L

Question 23

basic formula for concentratiomn

Answer 23

1) % to g
2) grams divided by 100 and sometimes multiplied by volume
3) answer?
were going to have to just wing it. jk do the practice questions.

Question 24

where do german chemists wash their dishes?

Answer 24

in de zinc

Question 25

what is a homogenous mixture

Answer 25

a mix that is uniform throughout.

Question 26

what is a solvent

Answer 26

any substance with others dissolved within it

Question 27

what os a solute?

Answer 27

often the smaller concentration of the dissolved thing, the thing that is added.

Question 28

what is the diff between a pure substance and a solution?

Answer 28

pure substances have fixed composition, whereas solutions have variable compositions

Question 29

what does miscible mean

Answer 29

able to form a homogeneous compound

Question 30

what is solublity

Answer 30

the ability to dissolve and share electrons

Question 31

what does it mean when something is saturated?

Answer 31

it is unable to dissolve any more, it is at its maximum concentration.

Question 32

what are spectator ions

Answer 32

the ions that do not combine in a DD reaction

Question 33

what are the strong acids

Answer 33

all halogens except for flurine (Cl, Br, I), HNO3, H2SO4, HClO3, HClO4.

Question 34

what is true about strong acids?

Answer 34

it completely dissociates in water to form H3O+

Question 35

what are the strong bases?

Answer 35

NaOH, KOH, LiOH, Ca(OH)2, Ba(OH)2, Mg(OH)2 (alkaline and alkaline earth metals)

Question 36

what is true about strong bases

Answer 36

creates OH-, dissociates into ions in water. Treat as arrhenius bases

Question 37

what is true about weak bases?

Answer 37

treat hem as b-l bases (proton acceptors), do not fully react.

Question 38

what do cops call goofy convicts in the forensics lab?

Answer 38

silicon

Question 39

how are axcids and bases able to conduct electricity?

Answer 39

they form ions tat carry charge

Question 40

what does arrhenius state?

Answer 40

acids and bases dissociate in water to form hydrogen and hydroxide ions

Question 41

true of false bases will always contain an oh- ion

Answer 41

false, they do not always comtain oh- ions, but acids always have h+ ions

Question 42

what is the b-l theory?

Answer 42

acids are treated as proton donors, requires bases for acids and acids for bases and so on.