balancing equations

Question 1

never change the __________, only add _______

Answer 1

chemical formula / coefficients

Question 2

mass cannot be ______ or _______

Answer 2

created / destroyed

Question 3

what is the Law of Conversation of Mass?

Answer 3

in a chemical reaction, the total mass of the reactants is always the same as the total mass of the products

Question 4

the number of each type of atom is ______ before and after a chemical reaction

Answer 4

the same

Question 5

the atoms of the reactants are ________ to form the products

Answer 5

rearranged

Question 6

molecules can be split apart to form new molecules but _____________________________

Answer 6

the atoms in the products are the same atoms that were in the reactants

Question 7

step 1 for balancing equations:

count all the _____ on each side of the equation

Answer 7

atoms

Question 8

polyatomic ions are broken down into ______

Answer 8

elements

Question 9

step 2 for balancing equations:

start balancing the _____ first, then the _____. leave ______ and _____ for last

Answer 9

metals / nonmetals / oxygen / hydrogen

Question 10

step 3 for balancing equations:

add a ______ in front of the chemical formula that needs to be _______

Answer 10

coefficient / balanced

Question 11

why do we add coefficients?

Answer 11

so the number of atoms of each element on the reactant side = the number of atoms of each element on the product side