Answer:
Magnets can be used to make other magnets and things made of iron move without being touched. Something that has been electrically charged can make other things move without touching them.
Explanation:
(can someone help me with my question?)
Answer:
Zn 3
s 1
o 4
Zn. zine
s. sulphate
o oxygen
3znso4. zine sulphateoxide
Answer: There are moles of Pb are contained in atoms Pb.
Explanation:
According to the mole concept, 1 mole of every substance contains atoms.
Hence, number of moles present in atoms of Pb are as follows.
Thus, we can conclude that there are moles of Pb are contained in atoms Pb.
I don't know much about this, but probably the reason why your teacher circled 300k is because of what's in the photo below. If you couldn't tell from the photo, its because 300k isn't negative. Anyway this is my guess, based on my limited knowledge.