Relative formula masses can be calculated and used in conservation of mass calculations. Calculations can be carried out to find out concentrations of solutions.
What is the relative formula mass of N2O?
Ar of N = 14 and Ar of O = 16.
What is the relative formula mass of Ca(NO3)2?
Ar of Ca = 40, Ar of N = 14 and Ar of O = 16.
What does the law of conservation of mass state?
No atoms are lost or made in a chemical reaction
Atoms are lost but not made in a chemical reaction
Atoms are made but not lost in a chemical reaction
Which of these is an example of a non-enclosed system?
A boiling tube in which two solutions react to form a solution and a precipitate
A test tube in which calcium carbonate is heated
A beaker in which an acid neutralises an alkali to form a salt solution
2.0 g of copper sulfate is dissolved in 0.5 dm3 of solution. What is the concentration of the solution?
A solution of potassium chloride has a concentration of 20 g/dm3. What mass of potassium chloride is dissolved in 5 dm3 of the solution?
What is the relative formula mass of Al2(SO4)3? - HIGHER
Ar of Al = 27, Ar of S = 32 and Ar of O = 16
What is the number of molecules in 23 g of NO2? - HIGHER
(Mr of NO2 = 46)
1.204 × 1024
6.02 × 1023
3.01 × 1023
What amount of O2 reacts with 4 mol of Al in the following reaction? - HIGHER
4Al + 3O2 → 2Al2O3
What mass of Al reacts with 96 g of oxygen in the following reaction? - HIGHER
Mr of O2 = 32 and Ar of Al = 27.