Advanced level 2026 BAEBOC chemistry 2
Advanced level 2026 BAEBOC chemistry 2
Based on the provided image, here is the extracted data and structured questions for Section A: Physical and General Chemistry.
SECTION A: PHYSICAL AND GENERAL CHEMISTRY
Constants provided:
-
$C = 12, H = 1, O = 16, S = 32, Al = 26$
-
Avogadro constant$= 6.02 \times 10^{23}$
1) a) What do you understand by:
-
i) Amount of substance
-
ii) Mole ratio(2 marks)
b) A solution was made by dissolving $9.0\text{g}$ of hydrated aluminium Sulphate $[Al_2(SO_4)_3.6H_2O]$ in $250\text{cm}^3$ of solution. Calculate:
-
i) The number of moles of the hydrated aluminium Sulphate
-
ii) The number of Sulphate ions in solution
-
iii) The concentration of the aluminum in the hydrated aluminum Sulphate in $\text{mol/dm}^3$(4 marks)
c) A sample of oxygen consisting mainly of the isotopes oxygen-16 and was enrich with oxygen-18. The composition of the mixture was $0.75$ oxygen-16 and $0.25$ oxygen-18.
-
i) Calculate the RAM of oxygen in the sample volume.
-
ii) The mass spectrum sketch of the sample of vaporize oxygen is shown below:
-
Graph description: Y-axis shows values $0.75$ and $0.25$. X-axis shows peaks at $16, 17,$ and $18$.
-
What do the axes x and y represent?
-
X: ____________________
-
Y: ____________________
-
-
-
iii) What part of the mass spectrometer ensures that the path travelled by the isotopes differ?(4 marks)
d) When excess lumps of Barium Carbonate are added to dilute hydrochloric acid the following reaction takes place:
$BaCO_{3(s)} + 2HCl_{(aq)} \rightarrow BaCl_{2(aq)} + H_2O + CO_{2(g)}$
Two experiments were carried out to follow the rate of this reaction. The result were plotted as follows:
Experiment (i): A graph showing an increasing curve starting from the origin that eventually plateaus.
Experiment (ii): A graph showing a decreasing curve starting from a high point on the Y-axis.
Would you like me to solve these calculations for you or explain the chemistry theories behind the graphs?
