BASIC VOCAB
This term means a chemical change that creates new substances.
✅ What is a chemical reaction?
A reaction that forms only one product.
SYNTHESIS
This type of substance always starts with H in its chemical formula.
H
H₂ + O₂ → H₂O
✅ What is 2 H₂ + O₂ → 2 H₂O?
CH₄ + O₂ → CO₂ + H₂O
✅ What is CH₄ + 2 O₂ → CO₂ + 2 H₂O?
These are the starting materials in a chemical reaction.
✅ What are reactants?
A reaction where one reactant breaks down into smaller products.
DECOMPOSITION
This substance produces OH⁻ in water.
base
Na + Cl₂ → NaCl
✅ What is 2 Na + Cl₂ → 2 NaCl?
C₂H₆ + O₂ → CO₂ + H₂O
✅ What is 2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O?
This part of a chemical equation shows what is formed and is represented by an arrow.
✅ What is “yields”?
A reaction where one element replaces another in a compound.
SINGLE REPLACEMENT
True or False: You can change subscripts to balance an equation.
false
N₂ + H₂ → NH₃
✅ What is N₂ + 3 H₂ → 2 NH₃?
Al + Br₂ → AlBr₃
✅ What is 2 Al + 3 Br₂ → 2 AlBr₃?
This big number in front of a chemical formula tells how many molecules are present.
✅ What is a coefficient?
A reaction where a hydrocarbon reacts with oxygen producing CO₂ and H₂O.
HYDROCARBON
This law states matter cannot be created or destroyed in a chemical reaction.
conservation of Mass
Fe + O₂ → Fe₂O₃
✅ What is 4 Fe + 3 O₂ → 2 Fe₂O₃?
Zn + HCl → ZnCl₂ + H₂
✅ What is Zn + 2 HCl → ZnCl₂ + H₂?
This small number inside a chemical formula tells the number of atoms in one molecule.
✅ What is a subscript?
This reaction contains an H and OH
acid base neutralization
HCl + NaOH → NaCl + H₂O is an example of this reaction type.
acid base neutralization
What element is usually balanced last in combustion reactions?
Oxygen
NaHCO₃ + C₆H₈O₇ → Na₃C₆H₅O₇ + CO₂ + H₂O
✅ What is 3 NaHCO₃ + C₆H₈O₇ → Na₃C₆H₅O₇ + 3 CO₂ + 3 H₂O?