Free Printable Form 4 Chapter 3 Mole, Chemical Formula and Equation

Worksheets

Form 4 Chapter 3 Mole, Chemical Formula and Equation

Total questions: 20

Worksheet time: 20mins

Name

Class

Date

6.02 x 10 ^23 of molecule atoms in hydrogen gas equal to 1 mole.

Is the above statement is true?

True

False

Empirical formula is a formula which gives the actual number of atoms of each element present in a compound.

Is the statement about empirical formula is true?

True

False

Is this chemical equation balanced ?

Yes

What is the meaning of Avogadro constant, N_A?

Volume occupied by one mole of gas

Mass of one mole of a substance

Number of particles in one mole of a substance

Pressure of one mole of a substance

Why carbon-12 was chosen as a reference standard for relative atomic mass, RAM?

Carbon is a solid and easier to be handled

Carbon is located in Group 14 in the Periodic Table of Elements

Carbon has three isotopes

Carbon is a nonmetal element

Which of the following compounds and formula is correct?

Diagram below shows the set-up of apparatus for an experiment to determine the empirical formula of magnesium oxide. Why is the crucible lid opened occasionally during the heating?

To avoid explosion

To allow oxygen gas to enter the crucible

To cool the magnesium

To see what happen inside the crucible

What is the molar mass of Mn(NO3)2 ?

188

179

139

122

Diagram below shows an observation when a cockle shell is put into a beaker containing vinegar. What is X?

Oxygen

Sulfur dioxide

Carbon dioxide

Hydrogen

10.

The relative molecular mass of compound with empirical of CH2 is 42.

CH2

C2H4

C3H6

C4H8

11.

Which of the following pairs of chemical substances will produce effervescence when react?

Silver nitrate and lead

Lithium and water

Copper and sulphuric acid

Chlorine and potassium hydroxide

12.

The following equation represents the reduction of iron (III) oxide by magnesium. What is the mass of magnesium needed to reduce 16.0g Iron(III) oxide? [Relative atomic mass: Fe=56, Mg=24, O=16]

2.4 g

5.6 g

7.2 g

16.0 g

13.

Which chemical equation is correctly balanced?

K + Cl2 →KCl

K + O2 →K2O

Zn + HCl → ZnCl2 + H2

Zn + H2SO4 →ZnSO4 + H2

14.

The reaction between lead(II) nitrate, Pb(NO3)2 and sodium chloride, NaCl produces lead(II) chloride, PbCl2 and sodium nitrate, NaNO3. Which ionic equation represents the reaction?

Pb(NO3)2 + NaCl → PbCl+ NaNO3

Pb(NO3)2 + NaCl → PbCl2+ NaNO3

Pb(NO3)2 + NaCl2 → PbCl2+ 2NaNO3

Pb(NO3)2 + 2NaCl → PbCl2+ 2NaNO3

15.

Potassium reacts with water to form an alkali and a colourless gas. The chemical equation of the reaction is as follows:

xK(s)+ yH₂O(1) zKOH (aq)+ H₂(g)

Balanced the chemical equation of the reaction by determine the value of x,y and z.

2,2,2

2,3,2

2,4,2

4,2,2

16.

The equation below shows combustion of ethanol. Calculate the volume of carbon dioxide gas produced if 0.05 mol of ethanol is burnt completely. [1 mol of gas occupied 24 dm3 at room temperature]

1.2 dm3

2.4 dm3

4.8 dm3

24 dm3

17.

Table bellow shows the percentage by mass of each element in a compound and their relative atomic mass. What is the empirical formula of the compound?

4 lines

18.

Diagram bellow show a crab shell in a beaker containing vinegar. What substance contained in the crab shell?

4 lines

19.

What is the meaning of empirical formula?

4 lines

20.

Sodium reacts with oxygen to produce a white metallic oxide.

Write the chemical equation for the reaction.

4 lines

100 %

Form 4 Chapter 3 Mole, Chemical Formula and Equation

Total questions: 20

Worksheet time: 20mins

Similar Resources on Wayground