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 __ each side of the equation.
created, destroyed, on
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
H₂ + O₂ → H₂O
synthesis
Balance this equation(answer is the ratio):
___ Mg + ___ O₂ → ___ MgO
2:1:2
What are products?
The substance(s) produced after a chemical equation.
temperature change
release of light
instant color change
odor change
precipitate
Organize these equations into balanced and unbalanced equations:
N2 + H2 -> NH3
H2 + F2 → 2HF
Balanced: H2 + F2 → 2HF
Unbalanced: N2 + H2 -> NH3
2NaCl → 2Na + Cl₂
decomposition
Balance this equation(answer is the ratio):
___ K + ___ Br₂ → ___ KBr
2:1:2
What is the difference between endothermic and exothermic?
Exo: releases energy and gets warmer
Endo: absorbs energy and gets colder
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
C₃H₈ + O₂ → CO₂ + H₂O
combustion
Balance this equation(answer is the ratio):
___ Cu + ___ AgNO₃ → ___ Cu(NO₃)₂ + ___ Ag
1:2:1:2
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
Fe + HCl → FeCl₂ + H₂
single replacement
Balance this equation(answer is the ratio)
___ Na₃PO₄ + ___ CaCl₂ → ___ NaCl + ___ Ca₃(PO₄)₂
2:3:6:1
What does balanced mean?
A balanced chemical equation correctly shows that no mass was created or destroyed during the reaction.
What is a catalyst and when is it used?
A substance that speeds up a chemical reaction without being permanently changed itself.
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
BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl
double replacement