5th grade science homework help

1)Jill was toasting marshmallows over the stove and the marshmallows caught fire. What are two things Jill would have observed that show a chemical reaction was taking place? 2)Making a grilled cheese sandwich involves grilling the sandwich until the bread has turned a golden brown and the cheese has melted. Describe the chemical and physical changes that occur during this process? Please explain because I don't really understand. THanks so much!

okay, my name is flappyjacks mcgee. im 11 years old and i need help on my science homework. okay here is the question. What is the solution to a roller coaster going up a slope of 34.6 degrees at a speed of 15 mph at angular momentum>?

Name 2 chemical reactions experiment ex: soda and mentos

I talked about it with her and I think I know what the answer is but she wanted to make sure by me asking all of you on Yahoo! Answers that way I can see if I'm right. If the majority of the answers I get are what I got, then I'll go for it. So yeah anyone wanna help my little sis out? Here's the question: Which tool allows scientists to see atoms on the surface of a metal? A-electron microscope B-magnifying glass C-light miscroscope D-scanning tunneling microscope And it couldn't be B because a magnifying glass would definitely not be able to magnify enough to view atoms... See, I was thinking D because I'm not sure that electron microscopes can magnify enough to view atoms, only ants and stuff like that. But I'm thinking that atoms are much, much too small to view with an electron microscope. But I think they can be viewed with a scanning tunneling microscope. I'm 18, turning 19 in 3 days. She turned 11 in March. Yes but search up 'Scanning tunneling microscope' on Wikipedia. I recently read the article and showed my little sis. We both think it is D, but B would be our second guess. But you'd still be able to view atoms on the surface of a metal with a scanning tunneling microscope...well, it would be a bit harder to adjust, since it is used mainly to view nano sized particles... But you can only view large atoms with a microscope, correct? What if they were small atoms? Then wouldn't your best bet be D? I'm gonna have to go with D. Thanks for the speficic use of the STM in the link you gave of your evidence, cborg76! :)

My brother has missed a few days of school and is confused on this question on his science homework. How do you make a compass with a magnetized nail, tape, string and a plastic jar with a lid? Any and all help is appreciated. Thanks