What is a coefficient?

A coefficient is the larger number in a chemical equation. For example, 2H2o, the larger number,2 , in the equation, which is before the H, is the coefficient. It tells us how many molecules of the substance there is.

What is a subscript?

A subscript is the smaller number in the chemical equation. For example, H2o, the number 2 in the equation is the subscript. It tells us how many atoms of each element is present in the equation. 

What is a chemical equation?

A chemical equation is the symbolic representation of a chemical reaction where in the reactant entities are given on the left hand side and the product entities on the right hand side.

Experiment 2 ( CH3COOH + NaHCO3 ---> CHCOONa +H2O + CO2 )

What was a chemical reaction in expeeriment 2?
 
  We poured 20 ml of vinegar into a 100 ml  measuring tube. Next, we lighted a tea candle and placed it into a plastic contanier bowl. The candled's depth is approximately 100 ml. Then we added about 1 gram of baking soda and held the measuring tube oveer the contanier bowl and the gas created, and took out the fire on the candle.

Experiment 1 (CH3COOH + NaHCO3 ---> CH3COONa + H2O + CO2)

What chemical reaction occured in experiment 1?

 We poured 10 ml. of vinegar into a test tube ( approximately 57 ml ). Then, we added approximately 0.5 g. of baking soda (sodium bircarbonate). When the two substances were combined it created foam, afterwards, it transformed into a gas, carbon dioxide(CO2), which blew up the balloon.