Chemistry Exam Questions

Topics: Sodium hydroxide, Carbon dioxide, Chlorine Pages: 3 (617 words) Published: March 25, 2012
Unit 3 Chemistry: VCAA Practice Exam Questions 1

Question 3 (2010)
A sample of the insecticide dichlorodiphenyltrichloroethane (DDT), C14H9Cl5, was found to contain 0.120 g of carbon. What mass of chlorine was present in the sample?
A. 0.127 g
B. 0.355 g
C. 0.994 g
D. 1.01 g

Question 10 (2009)
The level of carbon dioxide in the air in a spacecraft can be controlled by passing the air through canisters containing lithium hydroxide, LiOH. In a laboratory trial, the air in a 5.00 L container at 1.10 × 102 kPa and 25.0°C was passed through a canister of LiOH. The pressure of the air in the container decreased to 1.00 × 102 kPa, measured at 25.0°C. The mass of CO2 absorbed from the air sample by the LiOH in the canister was A. 0.89 g

B. 9.77 g
C. 10.6 g
D. 116g

Question 3 (2008)
Xylose is a compound that has five carbon atoms in each molecule and contains 40% carbon by mass. What is the molar mass of xylose? A. 30
B. 67
C. 150
D. It cannot be determined without further information.

Question 3 (2009)
A student is to accurately determine the concentration of a solution of sodium hydrogencarbonate in a titration against a standard solution of hydrochloric acid, HC1. The first step in this experiment is to accurately dilute 100.0 mL of a 1.00 M HCl stock solution to a 0.100 M solution using a 1.00 L volumetric flask. However, instead of using distilled water in the dilution, the student mistakenly adds 900.0 mL of 0.0222 M sodium hydroxide, NaOH, solution. a.Write an equation for the reaction that occurs in the 1.00 L volumetric flask. 1 mark b.Calculate the concentration of the hydrochloric acid in the 1.00 L volumetric flask after the student added the sodium hydroxide solution. Give your answer to correct significant figures. 2 marks The student then uses this contaminated hydrochloric acid solution to determine the accurate concentration of the unknown sodium hydrogencarbonate solution. c.Will the calculated concentration of sodium...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Chemistry Essay
  • chemistry Essay
  • Chemistry Exam Questions Essay
  • Question of Chemistry Essay
  • Essay about Questions on Chemistry
  • Questions on Chemistry Essay
  • Exam Questions Essay
  • Exam questions Essay

Become a StudyMode Member

Sign Up - It's Free