Average rate of evoluton of gas
Total mass of gas evolved during the reaction
Time taken for the reaction to reach completion
Initial reaction rates
Correct answer is B
The total mass of gas evolved during the reaction will remain the same in each case. This is because the amount of marble chips is the same in each case, and the reaction goes to completion. Therefore, the same amount of gas will be produced in each case, regardless of the concentration of the hydrochloric acid.
[NO2][N2]+[O2]
[2NO]2[N2][O2]
[N2]+[O2]2[NO]2
[NO]2[N2][O2]
Correct answer is D
No explanation has been provided for this answer.
What will happen if more heat is applied to the following system at equilibrium?
X2(g) + 3Y2(g) ⇌ 2XY3(g); ∆H = xKJmol−1
the yield of XY 3 will decompose
more of XY3 will decompose
More of X2 will react
the forward reaction will remain static
Correct answer is C
Increase in temperature will cause the forward reaction to occur, increasing the amounts of the products and decreasing the amounts of reactants.
Calculate the mass of sodium hydroxide in 5.00 dm3 of a 0.125 mol dm-3 solution. [NaOH = 40 g mol-1]
0.0156 g
0.625 g
1.00 g
25.0 g
Correct answer is D
1 mole of NaOH per dm3 has a mass of 40g.
mass of NaOH in 0.125mole
= 0.125 x 40 = 5g.
mass in 5.00 dm3 of the solution.
= 5 x 5 = 25.0g.
A substance is said to be hygroscopic if it absorbs
water from the atmosphere to form a solution
heat from the surrounding
carbon (IV) oxide from the atmosphere
moisture from the atmosphere without dissolving
Correct answer is D
No explanation has been provided for this answer.