Instructions for Section A
Answer all questions in pencil on the answer sheet provided for multiple-choice questions.
Choose the response that is
... [Show More] correct or that best answers the question.
A correct answer scores 1; an incorrect answer scores 0.
Marks will not be deducted for incorrect answers.
No marks will be given if more than one answer is completed for any question.
Unless otherwise indicated, the diagrams in this exam are not drawn to scale.
Question 1
In an electrolytic cell the electrode at which electrons are released is call the __________ and
the chemical change which occurs at this electrode is called ______________.
The terms that correctly fit the gaps in the sentence above are
A. anode, reduction
B. anode, oxidation
C. cathode, reduction
D. cathode, oxidation
Question 2
Hydrogen and nitrogen monoxide react according to the reaction
2H2(g) + 2NO(g) →2H2O(g) + N2(g)
The rate of this reaction can be investigated by measuring the decrease in pressure during
reaction and determining the rate of nitrogen production in mol L-1 s-1
.
Data for 6 different experimental mixtures of the reactants are given in Table 1.
Experiment Initial concentration
mol L-1
Initial rate of N2
production mol L-1 s-1
NO H2
1 6.00 ×10-3 1.00 × 10-3 3.19 × 10-3
2 6.00 × 10-3 2.00 × 10-3 6.37 × 10-3
3 6.00 × 10-3 3.00 × 10-3 9.56 × 10-3
4 1.00 × 10-3 6.00 × 10-3 0.48 × 10-3
5 2.00 × 10-3 6.00 × 10-3 1.92 × 10-3
6 3.00 × 10-3 6.00 × 10-3 4.31 × 10-3
Table 1
According to these data the initial rate of N2 production is
A. equal to the initial rate of consumption of H2.
B. directly proportional to the square of the initial concentration of NO.
C. equally dependent on the initial concentrations of NO and H2.
D. affected less by the initial concentration of NO than by the initial concentration of H2.
2 Learning Materials by Lisachem VCE Chemistry 2020 Year 12 Trial Exam Units 3/4
Question 3
Triglycerides obtained from vegetable sources, like olive oil and peanut oil, are called
vegetable oils and are liquids at room temperature. Triglycerides from animal sources, such as
lard, are called animal fats and are solids at room temperature.
The best explanation for this variation in state at room temperature is that
A. vegetable oils are saturated, and the animal fats are unsaturated.
B. vegetable oils have more carbon-carbon double bonds per molecule than animal fats.
C. vegetable oils are monounsaturated whereas animal fats are polyunsaturated.
D. vegetable oils have a higher ratio of H to C atoms than animal fats. [Show Less]