3. what is the chemical formula for photosynthesis?

6 CO2 + 6 H2O → C6H12O6 + 6 O2

What the symbols stand for:
CO2 = carbon dioxide
H2O = water
light is required
C6H12O6 = glucose
O2 = oxygen

Photosynthesis is the process plants go through to create its own food. It uses three components: light energy, carbon dioxide, and water. 6 carbon dioxide molecules and 6 water molecules are combined using heat from the light energy to result in 6 oxygen molecules and one molecule of the plant's food-- glucose.

6 carbon dioxide: 6CO2 (the number 2 is a subscript)
6 water: 6H2O (the number 2 is a subscript)
Oxygen: O2 (the number 2 is a subscript)
Glucose: C6H12O6 (numbers 6 and 12 are the subscript)

Combine carbon dioxides with waters :
6CO2 + 6H2O

To combine, light energy is used. Light energy is represented by the arrow:
>

Results in glucose and 6 oxygen:
C6H12O6 + 6O2

Combine all parts:
6CO2 + 6H2O > C6H12O6 + 6O2
(Remember to mention light energy is represented by the arrow)

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons