Chem – Quarter 4

1

Which of the following is NOT a valid reason to report an accident in the laboratory?

A To prevent similar accidents in the future B To get medical help if needed C To punish the person responsible D To ensure safety of others

2

Which SI base unit is used for the amount of substance?

A Kelvin (K) B Mole (mol) C Candela (cd) D Ampere (A)

3

What does the PASS method stand for in fire extinguisher use?

A Pull, Aim, Squeeze, Sweep B Push, Aim, Spray, Stop C Pull, Aim, Spray, Sweep D Point, Aim, Squeeze, Stop

4

Which of the following will undergo an addition reaction most readily?

A Methane B Ethane C Ethene D Propane

5

Which product is formed when methane undergoes complete combustion?

A Carbon monoxide and water B Carbon dioxide and water C Carbon and hydrogen D Only carbon dioxide

6

What should be done if a chemical gets on your skin?

A Wash with plenty of water B Cover with cloth C Wait for it to dry D Rub with oil

7

Cracking of hydrocarbons is used to:

A Combine small molecules B Break large molecules into smaller ones C Remove hydrogen D Add halogens

8

Which of the following is an alkene?

A Methane B Ethane C Ethene D Ethyne

9

Which of the following is a base SI unit?

A Newton B Joule C Kilogram D Pascal

10

What is the product of complete combustion of methane?

A CO and H2O B CO2 and H2O C C and H2 D CO2 and H2

11

Which hazard symbol is used for chemicals that can easily catch fire?

A Toxic B Flammable C Corrosive D Oxidising

12

Natural gas is mainly composed of:

A Methane B Ethene C Benzene D Ethyne

13

Which statement defines precision?

A How close repeated measurements are to each other B How close a measurement is to the true value C How costly the instrument is D How quickly the measurement is taken

14

How can parallax error be reduced when reading a measuring cylinder?

A By looking from above B By looking from below C By keeping the eye level with the meniscus D By shaking the cylinder

15

A student measures the mass of a sample five times and gets nearly the same value each time, but the value is far from the true mass. What does this show?

A High precision but low accuracy B High accuracy but low precision C High accuracy and high precision D Low accuracy and low precision

16

Which SI base unit is used to measure the amount of a substance?

A Kilogram (kg) B Mole (mol) C Kelvin (K) D Ampere (A)

17

Which process is used to break down large hydrocarbons into smaller ones?

A Fractional distillation B Cracking C Halogenation D Combustion

18

Which technique helps to reduce parallax error when reading a burette?

A Taking the reading from above the meniscus B Keeping the eye level with the meniscus C Using a broken apparatus D Ignoring the bottom of the meniscus

19

Which type of bond is present in alkynes?

A Single bond B Double bond C Triple bond D Ionic bond

20

Which of the following is the SI unit of amount of substance?

A Mole B Kilogram C Kelvin D Second

21

Which type of fire extinguisher is most suitable for putting out a fire caused by flammable liquids such as petrol?

A Water extinguisher B Foam extinguisher C Carbon dioxide extinguisher D Sand bucket only

22

What does an oxidising hazard symbol indicate?

A The chemical can provide oxygen and intensify fire B The chemical is safe to eat C The chemical is corrosive D The chemical is radioactive

23

The precision of an instrument is related to its:

A Colour B Smallest scale division (resolution) C Mass D Age

24

What should you do if a chemical spills on the lab floor?

A Inform the teacher and clean it up following instructions B Ignore it and continue working C Wipe it with your bare hands D Cover it with paper

25

What is meant by calibration of a measuring instrument?

A Checking and adjusting the instrument against a known standard B Cleaning the instrument with water C Reading the instrument from any angle D Using the instrument without checking