Molar Concentration Quiz
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5 questions, one answer each
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1. What unit is used to express molar concentration in this specification?
- A. g/dm³
- B. mol/dm³
- C. dm³/mol
- D. mol/g
2. What is the equation for calculating concentration in mol/dm³?
- A. Concentration = volume ÷ moles
- B. Concentration = moles ÷ volume (dm³)
- C. Concentration = moles × volume
- D. Concentration = moles × 1000
3. How many dm³ are equivalent to 250 cm³?
- A. 0.025 dm³
- B. 0.25 dm³
- C. 2.5 dm³
- D. 25 dm³
4. A solution has a concentration of 0.2 mol/dm³ and a volume of 500 cm³. How many moles of solute does it contain?
- A. 0.01 mol
- B. 0.1 mol
- C. 1.0 mol
- D. 10 mol
5. A student dilutes a solution by adding more water without adding any more solute. What happens to the concentration and why?
- A. It increases, because the volume decreases
- B. It decreases, because the same number of moles is now spread through a larger volume
- C. It stays the same, because the amount of solute is unchanged
- D. It becomes zero, because water has no concentration