Stoichiometry

Question 1

What is the formula for molarity?

Answer 1

Number of moles over Volume of solution

Question 2

What is the formula for dilution?

Answer 2

M1V1 = M2V2

Question 3

Give examples of types of chemical reactions

Answer 3

Precipitation Reactions
Acid-Base Reactions
Oxidation-Reduction Reactions

Question 4

What are the indicators of a chemical reaction?

Answer 4

• Emission of heat
• Colour change
• Formation of gas
• Emission of odour
• Formation of precipitate

Question 5

Which nitrate (NO3) salts are not soluble?

Answer 5

All nitrate salts are soluble.

Question 6

Describe the solubility of alkali metals and ammonium ion

Answer 6

Most salts containing the alkali metal ions (Li, Na, etc) and the ammonium ion (NH4) are soluble.

Question 7

Describe the solubility of halogen salts

Answer 7

Most Cl, Br and I salts are soluble except salts containing Ag, Pb and Hg.

Question 8

Describe the solubility of sulphate salts

Answer 8

Most sulphate salts are soluble except BaSO4, PbSO4, HgSO4, CaSO4

Question 9

Describe the solubility of hydroxide salts

Answer 9

Most hydroxide salts are only slightly soluble except NaOH and KOH because of the presence of the alkali metal ions.

Question 10

Describe the solubility of sulphides, carbonates, chromate and phosphate salts

Answer 10

Most sulphides (S), carbonates( (CO3), chromate (CrO4) and phosphate (PO4) salts are only slightly soluble