Chemistry ยท Science General

Common Chemical Compounds and Reactions

1,204 Questions

Common chemical compounds and reactions questions test your knowledge of everyday chemicals, their formulas, and their interactions. Topics include properties of acids and bases, hard water chemistry, and compounds like baking soda and plaster of paris. This section is essential for general science preparation.

Acids and basesPlaster of parisHard water chemistryCommon chemical formulasEveryday chemical reactions

Common Chemical Compounds and Reactions Questions

Multiple choice

What is the primary base in seawater?

  1. Sodium hydroxide

  2. Potassium hydroxide

  3. Calcium carbonate

  4. Magnesium hydroxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Calcium carbonate is the primary base in seawater, accounting for about 90% of the total alkalinity.

Multiple choice

What is the process by which carbonic acid is removed from seawater?

  1. Precipitation of calcium carbonate

  2. Reaction of carbonic acid with water

  3. Reaction of carbonic acid with hydroxide ions

  4. Reaction of carbonic acid with hydrogen ions
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbonic acid is removed from seawater when calcium carbonate precipitates out of solution.

Multiple choice

Which of the following ions is most likely to form a precipitate with calcium ions (Ca+2) in seawater?

  1. Chloride ions (Cl-)

  2. Sulfate ions (SO42-)

  3. Carbonate ions (CO32-)

  4. Sodium ions (Na+)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Calcium carbonate (CaCO3) is a common precipitate in seawater. This is because carbonate ions (CO32-) are abundant in seawater, and they react with calcium ions (Ca+2) to form calcium carbonate, which is insoluble in water.

Multiple choice

What is the effect of salinity on the solubility of calcium carbonate (CaCO3) in seawater?

  1. Solubility increases with increasing salinity.

  2. Solubility decreases with increasing salinity.

  3. Solubility is independent of salinity.

  4. Solubility varies randomly with salinity.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The solubility of calcium carbonate (CaCO3) decreases with increasing salinity. This is because the common ion effect suppresses the dissociation of CaCO3, making it less soluble.