Answer:
I think these are the answers:
Explanation:
created/rearranged
same/different
greater/less/same
A compound is two or more chemically combined elements. Fore example NaCl, CO2, H2O
2.2 x 10^-2
0.055 / 250 = 0.00022 - This would be 2.2 x 10^-4, but the question is asking for percent, not proportion, so multiply by 100% to get the percentage.
0.00022 * 100% = 0.022% = 2.2 * 10^-2
