Chemistry Ch 8 Notes

Front 1

Indications of a Chemical reaction

Back 1

1. Head and light
2. Production of a gas
3. Precipitate-solid
4. Color change

Front 2

Characteristics of chemical change

Back 2

1. Equation must represent known facts
2. Must contain correct formulas for reactants and products
3. Law of conservation of mass must be satisfied: same # of atoms

Front 3

Catalyst

Back 3

Changes rate of reaction but can be recovered unchanged

Catalyst over arrow
sped up and take place at lower temp

Front 4

(aq)

Back 4

Aqueuous solution- dissolved in water

Front 5

Significance of Chem equation

Back 5

1. Coefficients of chem reaction indicate relative, not absolute, amounts of reactants and products
2. Relative masses of reactants and products of a chemical reaction can be determined from reactions coefficients
3. Reverse reaction for a chemical equation same relative amounts of substances as forward reaction-can be read in either direction

Front 6

Balancing Equations

Back 6

1 Identify names of products and reactants and write word equation
2. Write formula equation
3. Balance formula
4. Count atoms to be sure that equation is balanced

Front 7

Balancing

Back 7

-Balance different atoms at a time
-1st balance elements combined and only appear once on each side
-Balance polyatomic ions that appear on both sides
- balance H and O atoms last