C1: Fundamentals Of Chemistry

Question 1

What does the top number of an element mean and show?

Answer 1

Mass number: shows the number of neutrons + number of protons

Question 2

Balance this equation:

CH4 + O2 -> CO2 + H2O

Answer 2

CH4 + O2 -> CO2 + H2O

1C 4H + 2O -> 1C 2O + 2H 1O

CH4 + 2O2 -> CO2 + 2H2O

Question 3

What does the bottom number of an element mean and show?

Answer 3

Atomic number: shows the number of protons/ electrons