Chemistry - LG 3A - 3B Chemical Reactions and the Law of Conservation of Mass

Is this chemical equation balanced? * 2 Fe2O3 + 3 C → 4 Fe + 3 CO2

Yes

Mass cannot be created or destroyed

Law of Conservation of Mass

Where is the reactant located in a chemical equation?

On the opposite side of the point of the arrow

What does the (a) stand for in a chemical equation?

The compound or element that is before the (a) is aqueous or it dissolved in water

What does (g) stand for in a chemical equation?

The compound or element that is before the (g) is after is a gas

What does the (s) stand for in a chemical equation?

The compound or element that is before the (s) is a solid

Why do we need to balance chemical equations?

We need to balance chemical equations based on the Law of Conservation of Mass because in a chemical equation, elements can't appear or disappear from the reactants to the products

What is the polyatomic ion is this chemical equation? * 2 Al + 3 (NO3) → Al2 (NO3)3

(NO3)

What is the polyatomic ion in this chemical equation? * CaSO4 + KOH → Ca(OH)2 + K2SO4

(OH)

How many "Al"'s total are in this chemical equation? * Al2(CO3)3 + H3PO4 → AlPO4 + CO2 + H2O

2

How many "H"'s are in the products in this chemical equation? * C2H6 + O2 → CO2 + H2O

2

How many "C"'s total are in this chemical equation? * C5H12 + O2 → CO2 + H2O

5

How many "S"'s are in the reactants in this chemical equation? * S8 + F2 → SF6

8

What is a polyatomic ion?

A set of two or more atoms together that have a specific charge *The element or compound would be in ( ).

Where is the product located in a chemical equation?

At the point of the arrow

What type of chemical reaction is this? * CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)

Combustion reaction

What type of chemical reaction is this? * 2 Ni2O3 → 4 Ni + 3O2

Decomposition reaction

What type of chemical reaction is this? * 2 NaBr + BaCl2 → 2 NaCl + BaBr2

Double displacement reaction

What type of chemical reaction is this? * Br2 + 2 KI → 2 KBr + I2

Single displacement reaction

What type of chemical reaction is this? * 4 Al(s) + 3 O2(g) → 2 Al2O3(s)

Synthesis reaction