10 minutes maximum! Can you do it in 5? |
1. In Chemistry, the unit for the amount of a substance is the ...
- A. gram
- B. kilogram
- C. mole
- D. cubic decimeter (dm3)
| |
2. The relative formula mass, Mr, of MgCl2 is:
- A. 95
- B. 46
- C. 59.5
- D. 95g
| |
3. The molar mass of NaHCO3 is: |
|
- A. 84
- B. 84g
- C. 52
- D. 52g
| |
4. Which of these is the correct formula for number of moles of a compound?
- A. number of moles = mass (in g) x relative formula mass (Mr)
- B. number of moles = mass (in g) ÷ relative formula mass (Mr)
- C. number of moles = mass (in kg) x relative formula mass (Mr)
- D. number of moles = mass (in kg) ÷ relative formula mass (Mr)
| |
5. How many moles are there in 10g of NaOH ? [Mrof NaOH = 40]
- A. 4
- B. 400
- C. 0.25
- D. 0.00025
| |
6. What is the mass of 0.2 moles of CO2? [Mr of CO2 = 44]
- A. 8.8g
- B. 220g
- C. 0.00454g
- D. 8.8kg
|
|
Q7-8: A farmer bought 40kg of the fertilizer ammonium nitrate, NH4NO3 . |
Muibu88 | CC4.0 licence |
7. The relative formula mass of ammonium nitrate is:
| |
8. The amount, in moles, of ammonium nitrate fertilizer purchased is:
- A. 0.5
- B. 2.0
- C. 500
- D. 3200
| |
9. Carbon dioxide, CO2, is a greenhouse gas.
How many moles in 1.00 tonne of carbon dioxide?
[1 tonne = 1,000,000g] |
Carbon visuals | CC2.0 licence |
- A. 0.0227
- B. 22.7
- C. 22 727
- D. 44
| |
10. Which of the following contains the greatest number of atoms?
- A. 2 moles of carbon, C
- B. 36g of carbon, C
- C. 0.5 moles of magnesium, Mg
- D. 48g of magnesium, Mg
| |
|