Chemistry Quiz

A student goes into lab and makes aspirin. He places the aspirin on the electronic balance and it reads 2.60g. The 2.60g amount of aspirin he made is termed his _?_ yield.

• theoretical

• actual

• percent

• equivalent

If you are dissolving magnesium chloride in water, which is/are true?

• the freezing point will go up and the boiling point will go down

• the freezing point will go down and the boiling point will go up

• the salt is the solvent

• the water is the solute

Which of the following reactions would decrease in entropy as written?

• H₂O(l) ---> H₂O(g)

• NH₄NO₃(s) + H₂O(l) ----> NH₄⁺(aq) + NO₃⁻(aq)

• 2H₂(g) + O₂(g) ---> 2H₂O(l)

• CaCO₃(s) ----> CaO(s) + CO₂(g)

When the pressure of a gas is _______________, the volume decreases.

• decreased

• increased

• kept constant

• cannot be determined

Water has a specific heat of 4.184 J/g x °C and aluminum has a specific heat of 0.900J/g x °C. Which of the following statements is true?

• Water has a lower specific heat than aluminum so it cools and heats faster.

• Water has a higher specific heat than aluminum so it cools and heats faster.

• Aluminum has a lower specific heat than water so it heats and cools slower.

• Aluminum has a lower specific heat than water so it cools slower and heats faster.

Determine sodium chloride’s coefficient when balanced: AlCl₃ + Na₂(SO₄) → NaCl + Al₂(SO₄)₃

Which of the following is a colloid?

• Sprite

• bottled water

• lemonade

• sweet tea

A Lewis acid will:

• lose protons

• gain neutrons

• gain an electron pair

• lose an electron pair

Determine the type of reaction taking place: Mg(OH)₂ + H₂SO₄ → Mg(SO₄) + H₂O

• double replacement

• combustion

• single replacement

• neutralization

Which of the following terms describes a mixture in which the particles are so large, like a lava lamp, that they settle out when stirring stops?

• colloid

• solution

• homogeneous mixture

• suspension