Hi Mom25!
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LynnH answered the first part of your question so well, and I agree she is right on track with her thoughts there. The chemistry in MTMM will be an introduction, not a full-blown high school credit worthy chemistry course. Carrie's suggestions for beefing it up to count it as a credit would work well if that is the direction you are wanting to go, otherwise, for an 8th grader, I think it looks perfect as is! I can't wait to do it with my oldest ds Wyatt. He has been eyeing the chem set described for months and picturing himself in a lab coat and goggles mixing this and that and (he hopes) seeing this or that explode, foam, or bubble over.
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This brings me to this part of your question...
Mom25 wrote:...Also, my 11yo 4th grader is very jealous that his older siblings will get to do chemistry, as he's been begging to do chemistry for a while now. Could he join them in MtMM chemistry, or is he too young? Would it be good to get a second chem. kit for three kids to participate together?...
There are actually quite a few warning signs on the chem kit. They are clear, and I don't think they will be difficult for older students to adhere to, but I do wonder if younger students could be careful enough to complete the chem experiments without doing some harm? Not sure. My 9 yo had the same reaction - wanting to do the chem set now, but he has his CTC science he will get to do this year, and that will be great fun for him. I let him know he'll get to do the chem kit a few years down the road, but for now, it's too mature for him and it's something special to do when you get to the MTMM guide.
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I think I'd get one kit first if I were you, and see what you thought about that. He will get to do it in a few years anyway, so possibly waiting might be safer all around. However, you will know here!
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The kit does look GREAT BTW, can't wait to have our oldest do it!
In Christ,
Julie