Explanations and Steps:
How to find the elements:
*Take every element (either one capital letter OR two letters with the first capital and second lowercase)
*Reference the periodic table to find the element name
The number of reactants:
*Reactants are on the left side, what there is before the reaction
*Each reactant is separated by the + sign
*They may be more than one element
The number of products:
*Products are on the right side, what there is after the reaction
*Each product is separated with the + sign
*They may be more than one element
Is it balanced:
Count the number of each element on both sides. It is balanced if both sides have the same number of every element.
*Write out each of the element symbols for each side
*Remember the multiply subscripts (little numbers) by coefficients (big numbers)
Answers:
<u>6.</u>
The elements are:
H - hydrogen
Cl - chlorine
Ca - calcium
O - oxygen
# of reactants: 2
# of products: 2
Is it balanced?
Reactants:
H 4
Cl 2
Ca 1
O 2
Products:
H 2
Cl 2
Ca 1
O 1
It's not balanced because H and O have different numbers of atoms in the reactants and products.
<u>7.</u>
The elements are:
K - potassium
Cl - chlorine
O - oxygen
# of reactants: 1
# of products: 2
Is it balanced?
Reactants:
K 1
Cl 1
O 3
Products:
K 1
Cl 1
O 2
It's not balanced because there are three oxygen atoms for reactants but only two oxygen atoms in the product.
<u>8.</u>
The elements are:
K - potassium
P - phosphorus
O - oxygen
H - hydrogen
Cl - chlorine
# of reactants: 2
# of products: 2
Is it balanced?
Reactants:
K 3
P 1
O 4
H 1
Cl 1
Products:
K 3
P 1
O 4
H 3
Cl 3
It's not balanced because H and Cl have different numbers of atoms.
<u>9.</u>
The elements are:
S - sulphur
O - oxygen
# of reactants: 2
# of products: 1
Is it balanced?
Reactants:
S 2
O 6
Products:
S 2
O 6
It's balanced because both sides have 2 sulphur atoms and six oxygen atoms.
<u>10.</u>
The elements are:
K - potassium
I - iodine
Pb - lead
N - nitrogen
O - oxygen
# of reactants: 2
# of products: 2
Is it balanced?
Reactants:
K 2
I 2
Pb 1
N 2
O 6
Products:
K 1
I 2
Pb 1
N 1
O 3
It's not balanced because K, N and O have different numbers of atoms.
