Okay then it to hard to now

You're right. Heptanoic acid would be (pause for mental math) C6H13COOH. With five hydrogens this is probably *benzoic* acid, where you start with benzene (C6H6), remove one hydrogen and attach a carboxyl group in its place. Good catch - sorry for the mistake.

It's basement bob!

Thanks for catching that!

Are you self-studying? If you're at a school, see what kind of tutorial support they have. Sitting down with a tutor periodically could help you fix any weak spots you're developing...

@@NorQuestCollegeOnlineAnytimeyes I’m self studying I’m going to try to get help

and the teachers at norquest are happy to help

You're welcome! Hope it helped.

PKU is a homozygous recessive condition.suppose if one out of 10000 live birts are effected with PKU that what is the percentage of carriers in that population?

Nevermind Its the same method as solving for a.

How do we get the specific heat capacity for the reactants? I remember reading somewhere that since they're aq solutions, it's the same as water.

@@sansthedrummer That's right. Aqueous solutions are usually like 99% water by mass, so 4.19J/gC is usually close enough. :) n x delta-H is the energy in the chemical reaction, m x c x delta-T is the heating energy, and unless we have unusually bad experimental design, those amounts are equal.

@@JasonFahy thank you!! That was a sticking point for me.

If you have a 't' term AND a 't^2' term, the the equation is quadratic and that makes the math a bit more painful - probably too painful for Physics 20. There are two scenarios. Scenario 1: d is zero. That helps a lot; we have 0 = v_ft - 1/2at^2, we can factor t out of it to obtain 0 = t(v_f - 1/2at) and that has two straightforward solutions, t=0 and t=2v_f/a. Scenario 2: d is NOT zero. Now the equation is a trinomial quadratic. If you're incredibly lucky it will be factorable, but generally we'd have to use the quadratic formula to find the value(s) of t. The formatting here is so limited, I don't think I can demonstrate the steps so I'll hope you know what I mean.

@@NorQuestCollegeOnlineAnytime I didn't realize at first, but most of the questions with d=vft-1/2a(t^2) that my teacher gives either have vf or vi = 0, or when that is not the case and I have to solve for t, I can use a different kinematic equation to find a new piece of information using my known variables. Then I can find an equation with the original variables plus the new one and solve it for t. I think I understand better now and thanks for taking the time to help.

I-2 definitely could be CC, but Cc is also possible. I generally won't put a genotype on there unless I'm sure about it, and two Cc children isn't very strong evidence. II-1 same thing, but even moreso because they only had one child. If I absolutely had to guess I'd say they're CC, but am I sure? Not at all.

That's a question for a genetic counsellor or a medical geneticist. You would (probably!) ask your doctor for a referral to these specialists for testing. I don't know if that's possible or likely because they usually screen for harmful genetic conditions, but I think you'd have to ask to know for sure! Non-serious response below: The Bio 30 response would be to have a million kids with someone who has blood type O (a known homozygote) and see what blood types your children have. If even one has a blood type of O, you can stop having kids and you know you're a heterozygote for blood type (AO). If you only have kids with blood type A, then you can be pretty sure (but not certain!) that you are a homozygote, too (AA). Your degree of certainty will increase with the number of children you have, but will never be 100%. Unless you're talking about AA vs AB, in which case a regular blood typing kit will tell you that in just a few minutes

@@bio20norquest42 Thank you!