Chemistry ยท Science General

Common Chemical Compounds and Reactions

1,197 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

Which of the following techniques is used to identify the functional groups present in a drug molecule?

  1. Infrared spectroscopy

  2. Nuclear magnetic resonance spectroscopy

  3. Mass spectrometry

  4. Ultraviolet spectroscopy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Infrared spectroscopy is used to identify the functional groups present in a drug molecule by analyzing the absorption of infrared radiation by the molecule.

Multiple choice

Which of the following techniques is used to determine the identity of a drug molecule?

  1. Infrared spectroscopy

  2. Nuclear magnetic resonance spectroscopy

  3. Mass spectrometry

  4. Ultraviolet spectroscopy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mass spectrometry is used to determine the identity of a drug molecule by analyzing the mass-to-charge ratio of the molecule.

Multiple choice

Which of the following is an example of a saline hydride?

  1. Sodium hydride (NaH)

  2. Lithium hydride (LiH)

  3. Potassium hydride (KH)

  4. Sodium borohydride (NaBH4)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sodium borohydride (NaBH4) is an example of a saline hydride. It is formed by the combination of sodium, boron, and hydrogen.

Multiple choice

Which of the following compounds is commonly known as baking soda?

  1. Sodium bicarbonate

  2. Sodium chloride

  3. Sodium hydroxide

  4. Sodium sulfate
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sodium bicarbonate, also known as baking soda, is a white, crystalline compound with the formula NaHCO3.

Multiple choice

What is the name of the compound with the formula NaCl?

  1. Sodium chloride

  2. Potassium chloride

  3. Calcium chloride

  4. Magnesium chloride
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sodium chloride, also known as common salt, is a white, crystalline compound with the formula NaCl.

Multiple choice

Which physical parameter of water is affected by the presence of calcium and magnesium ions?

  1. pH

  2. Turbidity

  3. Hardness

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

Hardness is influenced by the concentration of calcium and magnesium ions in water, affecting its ability to lather with soap.

Multiple choice

Which ion is the most abundant in seawater?

  1. Chloride

  2. Sodium

  3. Magnesium

  4. Calcium
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chloride is the most abundant ion in seawater, accounting for approximately 55% of the total dissolved solids.

Multiple choice

Which ion is the fourth most abundant in seawater?

  1. Calcium

  2. Potassium

  3. Sulfate

  4. Bicarbonate
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Calcium is the fourth most abundant ion in seawater, accounting for approximately 4% of the total dissolved solids.

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.