CH4) Stoichiometry of chemical reactions

Question 1

Mass relations in reactions

Answer 1

• chemical equations represent chemical reactions
• reactants appear on the left
• products appear on the right
• equation must be balamced
• number of atom of each element on the left
• equal the number of atoms of each element on the right

Question 2

How are equation written?

Answer 2

• know Reactants and products for a reaction for which equation is to be written
• often necessary to do an experiment and analysis

Question 3

Writing chemical equation

Answer 3

1) wirte a skeleton equation for the reaction
2) indicate the physical state of each reactant and product
3) balance the eqaution
4) onlt the coefficients can be changed; subscripts are fixed bu chemical nature of the reactants and products
5) it is best to balance atoms that appear only once on each side of the eqaution first

Question 4

Mass relation from equations

Answer 4

• The coefficients of a balanced equation
  represent the numbers of moles of reactants
  and products