Which of the following is a unit for concentration of a solution?
mol dm-3
cm3 s-1
m s-1
If 1.5 mol of copper sulfate is dissolved to make a solution with a volume of 2 dm3, what is the concentration of the solution?
3 mol dm-3
0.75 mol dm-3
1.33 mol dm-3
A solution has a volume of 650 cm3. What is the volume of this solution in dm3?
0.65 dm3
650,000 dm3
6.5 dm3
How many moles of hydrochloric acid are present in 25 cm3 of a solution which has a concentration of 0.1 mol dm-3?
2.5 moles
0.25 moles
0.0025 moles
A solution of NaOH has a concentration of 0.2 mol dm-3. Calculate its concentration in g dm-3. The Mr of NaOH is 40.
8 g dm-3
0.005 g dm-3
200 g dm-3
In the reaction between HCl and KOH, the acid and alkali react in a 1:1 ratio. What volume of 0.1 mol dm-3 KOH will be needed to neutralise 20 cm3 of 0.2 mol dm-3 HCl?
40 cm3
80 cm3
160 cm3
Which law states that equal volumes of different gases contain the same number of molecules?
Newton's second law
Avogadro's law
The law of conservation of mass
A sample of methane gas has a volume of 120 cm3 at room temperature and pressure. The molar volume is 24 dm3. How many moles of methane are present in the sample?
2,880 moles
5 moles
0.005 moles
What volume of carbon dioxide would be formed by the complete combustion of 20 cm3 of ethene? The equation is:
C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(l)
20 cm3
What volume of carbon dioxide gas will be produced by the complete combustion of 30g of carbon? Equation:
C(s) + O2(g) → CO2(g)
The molar volume is 24 dm3.
30 dm3
60 dm3
120 dm3