Chemical Revision weeks 4-8

Question 1

Ionic bond

covalent bond

Answer 1

1. Ionic Bonds
   - positive and negative
   - strong
   - Na⁺ Cl^-
2. Covalent Bond
   - non metal
   - strong but not as strong as Ionic Bonds
   - CI - CI

Question 2

Hydrogen Bond

Dipole - Dipole attractions

Despersion forces

Answer 2

1. Hydrogen Bond
   - F, O, N
   - Strongest out of the three
2. Dipole - dipole attractions
   - non metals
   - strong (in the middle)
3. Dispersion Forces
   - tempoary shift of electrons in non polar bonds
   - weak

Question 3

Nonpolar covalent
Polar Covalent
Ionic

Answer 3

1. Nonpolar Covalent
   - electrons shared equally
   - 0.4
2. Polar Covalent
   - electrons shared unequally
   - 0.4 - 1.7
3. Ionic
   - Electrons transferred
   - 1.8 - 3.3

Question 4

Types of visible evidence of a chemical reaction

Answer 4

1. Change in color
2. Formation of gas ( bubbles)
3. Formation of a solid (precipitate)
4. Heat ( or flame) produced or heat absorbed

Question 5

Combination

Answer 5

• Two or more reactants combine to yield a single product
• A + B → AB

Question 6

Decomposition

Answer 6

• A reactant splits into two or more prodcuts
• AB → A+ B

Question 7

single replacement

Answer 7

• One element replaces another element
• A + BC → AC+ B

Question 8

Double Replacement

Answer 8

• Two elements replace each other
• AB + CD → AD + CB