Balancing Chemical Equations
Balance this equation(answer is the ratio):
PCl5 → PCl3 + Cl2
1:1:1
What are reactants?
The substance(s) presented before a chemical equation.
Atoms can't ever be __ or __ in a chemical reaction. The atoms must always be __ on each side of the equation.
created, destroyed, balanced
Organize these equations into balanced and unbalanced equations:
CH4 + O2 -> CO2 + H2O
CO2 + H2 -> CO + H2O
Balanced: CO2 + H2 -> CO + H2O
Unbalanced: CH4 + O2 -> CO2 + H2O
What is true about the Law of Conservation of Mass?
A. Atoms are destroyed during a chemical reaction.
B. During a chemical reaction, atoms are created
C. Atoms cannot be created or destroyed, only rearranged.
C. Atoms cannot be created or destroyed, only rearranged.
Balance this equation(answer is the ratio):
H2S + O2 → SO2 + H2O
2:3:2:2
What are products?
The substance(s) produced after a chemical equation.
What is the term used for the elements and compounds before a chemical reaction takes place?
reactant(s)
Organize these equations into balanced and unbalanced equations:
N2 + H2 -> NH3
H2 + F2 → 2HF
Balanced: H2 + F2 → 2HF
Unbalanced: N2 + H2 -> NH3
The Law of Conservation of Mass that mass is not created or destroyed; it just changes form.
Balance this equation(answer is the ratio):
Pb(NO3)2 → PbO+ NO2 + O2
2:2:4:1
A chemical reaction that gives off heat is known as this.
What is exothermic.
What is the term used for the elements and compounds after a chemical reaction takes place?
product(s)
Organize these equations into balanced and unbalanced equations:
CuS+ O2 → CuSO4
CO+ 2H2 → CH3OH
Balanced: CO+ 2H2→ CH3OH
Unbalanced: CuS+ O2 → CuSO4
How are reactants different from products?
Reactants are different from products because reactants are the substances before a chemical equation. The products are the substances that are produced afterward.
Balance this equation(answer is the ratio):
Sb2S3+ O2 → Sb2O3+ SO2
2:9:2:6
What is matter?
Anything that has mass and takes up space.
How do you know when a chemical equation is balanced?
When the element(s) and compound(s) on both side are the same.
Organize these equations into balanced and unbalanced equations:
1N2 + 3H2 -> 2NH3
Al2O3+ 6Cl2→ AlCl3+ 3O2
Sb2S3+ 3Fe → FeS+ Sb
Balanced: 1N2 + 3H2 -> 2NH3
Unbalanced: Al2O3+ 6Cl2→ AlCl3+ 3O
Sb2S3 + 3Fe→ FeS+ Sb
What does the arrow mean in a chemical equation?
yield/produce
Balance this equation(answer is the ratio):
C2H3N+ O2 → CO2 + H2O+ NO
4:13:8:6:4
This type of reaction draws in heat from the environment around it.
What is endothermic
This is how you know a chemical reaction has occured?
What is a change in temperature, color, or odor, as well as, formation of a gas, precipitate, or light.
(Any of these will be accepted)
Organize these equations into balanced and unbalanced equations:
3Zn(OH)2+ H3PO4→ Zn3(PO4)2+ H2O
MnO2+ 4KOH+ O2 → K2MnO4+ H2O
MgO+ H2O → Mg(OH)2
Balanced: MgO+ H2O → Mg(OH)2
Unbalanced: 3Zn(OH)2+ H3PO4→ Zn3(PO4)2+ H2O
MnO2+ 4KOH+ O2 → K2MnO4+ H2O
This is the only time that atoms are created or destroyed in a chemical reaction.
What is never?