Gizmo Warm-up
- the law of conservation of matter states that no atoms are created of destroyed in a chemical reaction.
- A balanced chemical equation will show the same number of each type of atom on each side of the equation.
Reactants Products
H2+O2 >>>>>>>>> H2O
- A. There are 2 hydrogen atoms on the Reactants side. There are 2 hydrogen atoms on the products side.
B. There are 2 oxygen atoms on the reactants side. There is 1 oxygen atom on the product side.
2. The equation is not balanced.
Activity A
- A. The 2 in H2 represents how many hydrogen atoms are in the equation.
B. A subscript tells us how many atoms there are of each element.
C. Yes it is because they all show the number of atoms of each element there are.
2. A. There is 1 Ca atom, 2 O, and 2 H.
B. The number outside multiplies with the number inside of the parentheses.
C. Yes, it is true because they all multiplied together.
3.
Ag=1 Cl=3 Cu=2
Ba=1 As=2 O=8
N=3 H=12 P=1 O=4
Mn=1 Pb=8 Si=6 O=21
Activity B
1. In the equation H2+O2>>>H2O Oxygen is not in balance because there is 2 on the reactant side and only one on the product side.
2.
A. When you add a 2 n front of H2O there are 2 oxygen atoms.
B. There would be 4 hydrogen on each side of the formula.
C. Yes the formula is balanced.
3.
A. Oxygen, Hydrogen, and Bromine
B. Ca(OH)2+2HBr >>>>> CaBr2+2H2O
2.
A. When you add a 2 n front of H2O there are 2 oxygen atoms.
B. There would be 4 hydrogen on each side of the formula.
C. Yes the formula is balanced.
3.
A. Oxygen, Hydrogen, and Bromine
B. Ca(OH)2+2HBr >>>>> CaBr2+2H2O
- Reactants are the substances that enter into the reaction.
- Products are the substances that are made in the reaction.
- You are only allowed to change the number of molecules of each substance by adding coefficients in front of the formulas.