James Ruse Chemistry 2011

Topics: Hydrochloric acid, Sodium chloride, Chemistry Pages: 21 (3107 words) Published: June 20, 2013
Student Number

Mark / 100

2011
TRIAL HSC EXAMINATION

Chemistry

General Instructions
• • • • • • • Reading time – 5 minutes Working time – 3 hours Write using black or blue pen Draw diagrams using pencil Board-approved calculators may be used A data sheet and a Periodic Table are provided. Write your Student Number at the top of this page and those of pages 10 and 11.

Total Marks – 100 Section I Pages 2 – 24

Confidential Keep Secure

75 marks
This section has two parts, Part A and Part B Part A –20 marks •Attempt Questions 1- 20 •Allow about 35 minutes for this part Part B – 55 marks •Attempt Questions 21 – 32 •Allow about 1 hour and 40 minutes for this part Pages 25 – 26

Section II 25 marks

•Attempt Question 33 •Allow about 45 minutes for this section

JRAHS TRIAL HSC Exam Chemistry 2011

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Section I
75 marks Part A – 20 marks Attempt Questions 1-20 Allow about 35 minutes for this part

Use the multiple choice answer sheet on page .....

Mark your answers on the ANSWER grid on page 10. ________________________________________________________________________________

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Part A Multiple Choice Use the multiple – choice answer sheet for Questions 1 – 20 . 1. Which of the following chemicals would decolourise bromine water the quickest in the presence of UV light? (A) (B) (C) (D) Concentrated H2SO4 Cyclohexane 1-hexene 1-hexanol

2.

What products would result from the catalytic cracking of a 15-carbon alkane? (A) (B) (C) (D) One alkane and one alkene One alkanoic acid and one alkanol Two alkanes Two alkenes

3.

The molar heat of combustion of ethanol is 1367 kJ mol-1. A 2.510 g sample of ethanol was combusted in heating a certain mass of water from 25 oC to 45oC. 80% of the heat released was absorbed by the water. What was the quantity of water heated? (A) (B) (C) (D) 712.7 g 713.8 g 890.9 g 892.2 g

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4.

A sample was tested for its approximate pH using several indicators. The results are given in the table. Indicator bromothymol blue litmus methyl orange phenolphthalein What is the most accurate estimate for the pH of the sample? (A) (B) (C) (D) Between 6.0 and 6.3 7.0 Between 7.5 and 8.0 Between 9.0 and 14.0 Colour of indicator in sample blue blue yellow colourless

5.

Why is radon-226 a radioactive isotope? (A) (B) (C) (D) Its mass number is greater than 83. It has more neutrons than protons. The ratio of neutrons to protons is not 1:1. The ratio of neutrons to protons is too low.

6.

The half-equations for the vanadium redox cell are given below. VO2+ (aq) + 2H+ + e-  VO2+ (aq) + H2O (l) V2+ (aq)  V3+ (aq) + eWhat is the change in the oxidation state of vanadium for the reduction half-equation in this cell? (A) (B) (C) (D) 2+ to 0 3+ to 2+ 2+ to 3+ 5+ to 4+

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7.

In order to determine the relative activity of four metals, each metal was placed in the salt solutions of the other metals and observed for signs of a reaction. The results are displayed in the table. Note that R = reaction occurred; NR = no sign of a reaction; – = not tested

Metal 1 Salt solution of Metal 1 Salt solution of Metal 2 Salt solution of Metal 3 Salt solution of Metal 4 – R NR R

Metal 2 NR – NR R

Metal 3 R R – R

Metal 4 NR NR NR –

What is the relative activity of the four metals as determined by these results? most active metal  least active metal (A) (B) (C) (D) 3142 2143 3124 4213

8.

Which of the following is a Bronsted- Lowry acid – base reaction? (i) (ii) (iii) (iv) CO2(g) + H2O(l) HCO3– (aq) + H+ (aq)

H2SO4(l) + H2O(l)  HSO4–(aq) + H3O +(aq) CaO(s) + CO2 (g)  CaCO3(s) NH3(g) + HCl (g)  NH4Cl (s) all the reactions (i) and (iii) only (ii) and (iv) only (iii) and (iv) only

(A) (B) (C) (D)

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