Science 30 January 2000 Diploma Examination
Science 30 January 2000 Diploma Examination Science 30 January 2000 Diploma Examination
20. Expedition members titrated a 10.0 mL sample of rain water with a 1.00 × 10 –3 mol/L sodium hydroxide solution. The volume of sodium hydroxide required for their titration was 1.75 mL. The hydronium ion concentration, [H 3 O + (aq)], in the sample was A. 1.75 × 10 –4 mol/L B. 1.75 mol/L C. 5.71 × 10 –4 mol/L D. 5.71 mol/L 21. The expedition members found that the pH of rain water in an area decreased from 7 to 5 over a period of time. This meant that the hydronium ion concentration, [H 3 O + (aq)], of the rainwater had A. increased by a factor of 2 B. decreased by a factor of 2 C. increased by a factor of 100 D. decreased by a factor of 100 22. Expedition members added a sample of rainwater that had a pH of 4.7 to a mixture of the indicators thymol blue, phenolphthalein, and alizarin yellow R. The colour of the resulting solution was A. green B. brown C. yellow D. orange 12
Numerical Response 6. The pH of a water sample that has a hydronium ion concentration, [H 3 O + (aq)], of 3.0 × 10 –5 mol/L is ______. (Record your answer to three digits in the numerical-response section on the answer sheet.) Use the following information to answer the next question. Some Pollutants 1 Dioxins and furans 2 Phosphates 3 NO x gases 4 Lead Numerical Response 7. Some pollutants accumulate in the Arctic. Match each of the pollutants numbered above with the appropriate source given below. Use each number only once. Fertilizers ______ (Record in the first column.) Batteries ______ (Record in the second column.) Automobiles ______ (Record in the third column.) Pesticides ______ (Record in the fourth column.) (Record your answer in the numerical-response section on the answer sheet.) 23. The two main contributors to the formation of acid rain are A. methane and ozone B. ozone and nitrogen oxides C. sulphur oxides and methane D. nitrogen oxides and sulphur oxides 13
- Page 1 and 2: cience 30 Science 30 Science 30 Sci
- Page 3 and 4: Multiple Choice • Decide which of
- Page 5 and 6: Personnel in a medical clinic must
- Page 7 and 8: - - Use the following information t
- Page 9 and 10: The exploration of space adds to ou
- Page 11 and 12: Use the following information to an
- Page 13 and 14: Use the following information to an
- Page 15: Use the following information to an
- Page 19 and 20: The expedition boarded a small subm
- Page 21 and 22: 30. As current passes through a lig
- Page 23 and 24: Use the following information to an
- Page 25 and 26: Use the following information to an
- Page 27 and 28: Use the following information to an
- Page 29 and 30: 39. The pesticide methylparathion i
- Page 31 and 32: ...................................
- Page 33 and 34: ...................................
- Page 35 and 36: Science 30 January 2000 Keys Sample
- Page 37 and 38: January 2000 LA 1 - Sample Answer a
20. Expedition members titrated a 10.0 mL sample of rain water with a 1.00 × 10 –3 mol/L<br />
sodium hydroxide solution. The volume of sodium hydroxide required for their<br />
titration was 1.75 mL. The hydronium ion concentration, [H 3 O + (aq)], in the<br />
sample was<br />
A. 1.75 × 10 –4 mol/L<br />
B. 1.75 mol/L<br />
C. 5.71 × 10 –4 mol/L<br />
D. 5.71 mol/L<br />
21. The expedition members found that the pH of rain water in an area decreased from<br />
7 to 5 over a period of time. This meant that the hydronium ion concentration,<br />
[H 3 O + (aq)], of the rainwater had<br />
A. increased by a factor of 2<br />
B. decreased by a factor of 2<br />
C. increased by a factor of 100<br />
D. decreased by a factor of 100<br />
22. Expedition members added a sample of rainwater that had a pH of 4.7 to a mixture<br />
of the indicators thymol blue, phenolphthalein, and alizarin yellow R. The colour<br />
of the resulting solution was<br />
A. green<br />
B. brown<br />
C. yellow<br />
D. orange<br />
12
Change language