Answer:
Question 8, I think is C describe CR. Question 7 is Chemical reactions produce new substances
Explanation:
Answer:
the balanced equation to the combustion of gasoline is C8H18 + 12.5 O2 → 8 CO2 + 9 H2O (1)
Answer:
B
Explanation:
B. There are two atoms of Nitrogen and two atoms of Hydrogen combined to make Ammonia.
Answer:
The atomic weight of an element represents the ratio of the average mass of atoms of a chemical element.
Answer:
13.8%
Explanation:
take the 123g and divide it by the total mass which is 123g + 765g
123/888 = .138
multiply by 100 for a percentage = 13.8%
