10-minute Quiz : Chapter 1 Introduction to Chemistry

Refer to the set-up shown in the diagram below. Which of the following combinations is correct?

• A
• B
• C
• D

When heating a test tube containing about 2 cm³ of dilute hydrochloric acid, you should

(1) stopper the test tube.

(2) never point the test tube to anyone.

(3) hold the test tube with a test tube holder.

• A. (1) only
• B. (2) only
• C. (1) and (3) only
• D. (2) and (3) only

A calcium granule is added to a beaker of dilute hydrochloric acid. Which of the following are the correct ways of making observations in this experiment?

(1) See if the calcium granule dissolves.

(2) Hear if any hissing sound can be heard.

(3) Touch the resultant solution with fingers to see if it becomes warm.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

The following hazard warning label is found on a bottle of dilute sulphuric acid. Which of the following statements concerning this dilute sulphuric acid is correct?

• A. It is corrosive.
• B. It is irritant.
• C. It is harmful.
• D. It is oxidizing.

A student uses the set-up shown in the diagram below to measure the volume of carbon dioxide produced when different masses of marble chips are added to 100 cm³ of dilute hydrochloric acid. What other apparatus are needed in the experiment?

• A. Filter funnel and electronic balance
• B. Filter funnel and stopwatch
• C. Measuring cylinder and electronic balance
• D. Measuring cylinder and stopwatch

You have accidentally broken a beaker and some alkalis are spilt on the bench. You should

(1) leave the spill to dry in air.

(2) clean up the spill at once.

(3) report to your teacher at once.

• A. (1) only
• B. (2) only
• C. (1) and (3) only
• D. (2) and (3) only

Which of the following is NOT the advantage of performing microscale experiments?

• A. Reduce the amount of chemicals used.
• B. Reduce the chemical wastes produced.
• C. Obtain more accurate experimental results.
• D. Complete the experiment in a shorter period of time.

Some unused dilute sodium hydroxide solution is left after an experiment. You should

• A. pour the solution back to the reagent bottle.
• B. pour the solution to the waste bin.
• C. pour the solution to the sink.
• D. pour the solution to the reagent bottle containing a dilute acid.

When smelling a gas coming out from a test tube, you should

(1) bring the test tube close to your nose.

(2) hold the test tube a short distance away.

(3) fan the gas towards your nose.

• A. (1) only
• B. (2) only
• C. (1) and (3) only
• D. (2) and (3) only

Which of the following hazard warning labels should be displayed on a metal cylinder containing liquefied petroleum gas?

• A
• B
• C
• D