Unit 3 Questions MEGATHREAD :)

[pi]

Ok, thanks scocliffe09!

What about the -OH at the ends of DNA? Is that also dependent on the environment?

[The Full House]

do we have to know the solubility tables!??!

[luken93]

If you're wanting to show the specific properties of a reaction (ie alkanol + carboxylic -> ester), can you still write it like
C2H6O + C2H4O2 -> C4H8O2 + H2O or
CH3CH2OH + CH3COOH -> CH3COOCH2CH3 + H2O or
C2H5OH + CH3COOH -> CH3COOC2H5 + H2O

Thanks

[jane1234]

If you're wanting to show the specific properties of a reaction (ie alkanol + carboxylic -> ester), can you still write it like
C2H6O + C2H4O2 -> C4H8O2 + H2O or
CH3CH2OH + CH3COOH -> CH3COOCH2CH3 + H2O or
C2H5OH + CH3COOH -> CH3COOC2H5 + H2O

Thanks

Don't think it matters unless they specifically ask for the semistructural formula or molecular formula... if they don't say I'd do them in semistructural... less likely to make silly mistakes counting carbon atoms

[Bozo]

If your showing the specific properties, i would write it the 2nd way you did it. But i think all 3 ways are acceptable.

[cltf]

I agree with the first and second but not the third, purely because its a hybrid.

[nacho]

if we are given the concentration of a solution as 2M
do we take that into consideration when giving our answers in significant figures?

[Andiio]

if we are given a question telling us that a process is only 90% efficient, and that masses of 9.000 kg etc are produced, do we take into account the 2 sig figs of the 90%?

[nacho]

if we are given a question telling us that a process is only 90% efficient, and that masses of 9.000 kg etc are produced, do we take into account the 2 sig figs of the 90%?

i think it'd be the weight
something to 1 sig fig seems off (wait is 90% 1 or 2 sig figs?)

[mickeymouse]

90% is two sig figs and I don't think percentages are taken into account

[Andiio]

Could someone please help me with part b) of this question? I'm fairly certain that the solutions are wrong :\

[Vincezor]

Could someone please help me with part b) of this question? I'm fairly certain that the solutions are wrong :\

Argh that's from Engage right? I wasn't sure of the answer for part b) either. How would you even work it out? :S

[DisaFear]

What's the answer?
I'm stupid so I just think it's 2:1, amirite?

Or is it 1:2? The reactant has 2 moles of P, the other dude has 4

[Andiio]

Could someone please help me with part b) of this question? I'm fairly certain that the solutions are wrong :\

Argh that's from Engage right? I wasn't sure of the answer for part b) either. How would you even work it out? :S

Yeah it is, I was like 'WTF' at the question. The solutions don't even make sense, they state that C is the limiting reagent when it had the greatest amount of mol ==

For the question: Name the type of bonding that is present between a deoxyribose molecule and phosphate molecule,
I wrote phosphodiester bonding - the answers stated hydrogen bonding. Am I right or is it actually H-bonding?

Thanks!

[mickeymouse]

in response to that engage question I asked my teacher about that

it was worded weirdly so don't worry about it... so dodgy!