DrBpb222

OK. I think I see part of the problem. I goofed in my earlier response(s). <b> I said there was only one reaction with electrons on the left side, or a gain of electrons.</b><i>As you have correctly pointed out, answers A and D have electrons on the left...

The 224/36 is correct. The 138/36 is correct. The 161/36 is not correct. The LCD is 36, 36/4 = 9 and 9 x 7 = ?? and ??/36 is the fraction. Thanks for showing your work. It helps us find the error much easier.

An insulin pump and an insulin pin are acceptable but I would call those the same treatment; i.e., with insulin. The difference is in the delivery system. Not all diabetics take insulin. There are other drugs available which work in some cases. Much of th...

C3H8 + O2 ==> CO2 + H2O. In my mind there is no "first" element to look at in balancing. People balance equations different ways. However, in the spirit of the question, I would start with C.

metals

These numbers must refer to paragraphs, problems, chapters, or something of that nature where the full problem is found.

You didn't do anything wrong. The answer is wrong. For a pH of 8.4, the (H^+) <b>[not OH^-)]</b> must be 3.98E-9. You can prove that by pH = -log(H^+) -8.4 = log(H^+) Take antilog of both sides. 3.98E-9 = (H^+)