Form 4 Chemistry All Chapters

A student carries out an experiment to determine the rate of dissolving salt at different sizes. Which of the following apparatus is essential for the experiment?

• Bunsen burner

• Conical flask

• Stopwatch

• Evaporating dish

Chemical wastes in the laboratory have a specific method of disposal according to the type of material. Which of the following methods is correct to dispose the chemical waste?

• Hydrogen peroxide waste with a low concentration can be poured directly into laboratory's sink.

• Solutions containing heavy metals must be kept in a dark reagent bottle.

• Volatile waste should be stored in the container.

• Solid wastes like glass and rubber must be disposed into the dustbin.

Different types of chemicals should be stored and disposed by using different method. Which of the following is the way to dispose substances with pH value less than 5 and more than 9?

• Stored in plastic bags and the solutions be left to evaporate in fume chamber.

• Poured directly into the laboratory's sink.

• Stored in closed labelled containers.

• Stored in closed containers and kept away from light and heat.

What is substance P at room temperature?

• Glucose

• Water

• Hydrogen

The diagram shows the standard representation of sodium atom. What is the number of valence electron of the atom?

• 11

• 1

• 12

• 2

Which isotope is commolnly used to treat thyroid cancer?

• Cobalt-60

• Iodine-131

• Carbon-14

• Phosphorus-32

The diagram shows the setup of apparatus to determine the empirical formula of oxide of metal G.

• Iron

• Tin

• Magnesium

• Silver

What is the meaning of Avogadro constant?

• Volume occupied by one mole of gas

• Pressure of one mole of a substance

• Number of particles in one mole of a substance

• Mass of one mole of a substance

Which subatomic particle was discovered by Ernest Rutherford?

• Proton

• Neutron

• Nucleon

• Electron

Gas X is commonly used in flashlight of cameras and lasers for eye retina treatment. What is gas X?

• Radon

• Xenon

• Krypton

• Helium