Balancing Chemical Equations

types of reactions

100

Two different elements combine to create a compound

What is synthesis?

200

Compounds breaking down into elements

What is decomposition?

300

Burn; Requires oxygen and results in carbon dioxide and water

What is combustion?

400

One element replaces an element that is part of a compound

What is single displacement?

500

Two elements in a compound switch places

What is double displacement?

level 1

100

_C + _O₂ -> _CO₂

C + O₂ -> CO₂

200

_NaBr + _H₃PO₄ -> _Na₃PO₄ + _HBr

3NaBr + H₃PO₄ -> Na₃PO₄ + 3HBr

300

_PbSO₄ -> _PbSO₃ + _O₂

4PbSO₄ -> 4PbSO₃ + 2O₂

400

_S₃ + _Al₂ + _CO₅ + _S -> _Al₄CO₁₀S₃

2S₃ + 4Al₂ + 4CO₅ + S -> 2Al₄CO₁₀S₃

500

_Zn + _HCl -> _ZnCl₂ + _H₂

Zn + 2HCl -> ZnCl₂ + H₂

level 2

100

_S₈ + _F₂ -> _SF₆

S₈ + 24F₂ -> 8SF₆

200

_FeO₂ + _Au₃ -> _Fe₃Au₂ + _O₂

9FeO₂ + 2Au₃ -> 3Fe₃Au₂ + 9O₂

300

_Ne₄Br₆ + _K₂O₂ -> _Ne₂K₃ + _Br₃O₃

Ne₄Br₆ + 3K₂O₂ -> 2Ne₂K₃ + 2Br₃O₃

400

_C₅H₁₂ + _O₂ -> _CO₂ + _H₂O

C₅H₁₂ + 8O₂ -> 5CO₂ + 6H₂O

500

_CO₂ + _H₂O -> _C₆H₁₂O₆ + _O₂

6CO₂ + H₂O -> C₆H₁₂O₆ + O₂

level 3

100

_H₂SO₄ + _HI → _H₂S + _I₂ + _H₂O

H₂SO₄ + 2HI → H₂S + I₂ + 4H₂O

200

_C₇H₆O₂ + _O₂ -> _CO₂ + _H₂O

2C₇H₆O₂ + 15O₂ -> 14CO₂ + 6H₂O

300

_SiCl₄ + _H₂O -> _H₄SiO₄ + _HCl

SiCl₄ + 4H₂O -> H₄SiO₄ + 4HCl

400

_Ca(OH)₂ + _H₃PO₄ ---> _Ca₃(PO₄)₂ + _H₂O

3Ca(OH)₂ + 2H₃PO₄ ---> Ca₃(PO₄)₂ + 6H₂O

500

_Al₂(SO₄)₃ + _Ca(OH)₂ -> _Al(OH)₃ + _CaSO₄

Al₂(SO₄)₃ + 3Ca(OH)₂ -> 2Al(OH)₃ + 3CaSO₄

Miscellaneous

100

Carbon dioxide and water

What are the elements that must be created in a combustion reaction?

200

Number above an element that tells the number of electrons the element has

What is a superscript?

300

Number below an element that tells the number of atoms of that element

What is a subscript?

400

XY + A -> AY + X

What is a single displacement equation?

500

XY + AB -> XB + AY

What is a double displacement equation?