Recent content by givemeknowledge

Homework Statement So I've calculated the person's corrective lens to need the power of -2.00D now I must find the new near point with the corrective lens on. The initial near point is 15cm and I converted the -2.00D into cm, which is -50cm (I hope). Homework Equations I've used this formula...

Homework Statement Calculate the focal length of a planoconvex lens that produces a real image 2.5 times as big as the object if the object is 2.5 cm from the lens? Homework Equations The only one I can think of is 1/f = 1/v + 1/u The Attempt at a Solution [/B] My 'attempt' is 1/f = 1/62.5...

So would I be right in thinking... If N2 is 2 nitrogen atoms, and both have a charge of 3- does that give it a formal charge of 6-? One thing that's confusing me.. The question says "the following compounds" yet N2 is not a compound... hmm

Na needs to gain an electron (I think) and Cl needs to lose an electron to reach the nearest full shell

I've read about the octet rule but just can't join the two together, FML. Okay I won't in future, I'm very new here.

Hey, So I've got a homework question which is gradually transforming by brain into mashed potato! Here it is.. Identify which of the following compounds contains ions and state the formal charges on the ions: NaCl, N2, MgO, AlCl3, and CO2. Now, I'm not asking for someone to come in and give...

Hey! I'm struggling really badly with some physics homework, we've done nothing on this stuff in class and I can't find ANY help online and I'm stressing pretty bad right now so ANY help would be AMAZING! Here's my questions... "This question is about electromagnetic waves traveling in free...