C3.2 The Mole – LearnITbyTests

1. A mole is the number of particles in the relative atomic mass of an element or the relative molecular mass of a substance expressed in grams. True or False

TRUE

FALSE

Maybe

None

2. A solution whose concentration (molarity) is known is known as

Concentration

Molarity

Molar solution

Standard solution

3. The Avogadro’s constant (NA) = 6.02 × 1023 True or False

TRUE

FALSE

Maybe

NONE OF THE ABOVE

4. Why is the hydrogen atom not a preferable atom of choice to be used as a standard atom to compare it to other atomic masses of other elements?

Hydrogen weight is negligible

Hydrogen atom only exist as a compound i.e. water H2O

Existence of the various hydrogen isotopes

None of the above

5. Mention the 2 common types of titration

Acid/base titration

Redox titration

Both B and A

None of the mentioned

6. State Gay-Lussac’s Law

hen gases react, they do so in volumes that bear a simple whole-number ratio to one another and to the volume of the products.

When gases react they do so in volumes that bear a simple whole-number ratio to one another and to the volume of the products if gaseous.

When gases react they do so in volumes that bear a simple whole-number ratio to one another and to the volume of the products if gaseous provided the temperature and pressure remain unchanged

None of the above.

7. Is the following equation CORRECT OR NOT?

Maybe

YES

None of the above

8. Empirical formula × N = MOLECULAR FORMULA; where N= simple whole number. True or False

TRUE

FALSE

Maybe

None of the mentioned

9. Which of the following statement about Mono-atomic gases is correct

Gaseous elements whose atoms are stable and do not join up with others or the same atoms to form molecules.

Their outermost configuration includes 8 or 2 electrons in their outer shell

They exist as gases in the atomic form.

All of the above

10. Mention the 2 ways in which chemical reactions can be expressed

Use of word equations

Use of chemical equations

Both A and B

None of the above

11. Mention the 2 ways in which the concentration of a solution can be expressed

Grams per liter (dm3)

Moles per liter

Both B and A

None of the above

12. The number of atoms of the element that join up to form a molecule of the element is known. as the atomicity of the given gas i.e. atomicity of chlorine gas is 2. True or Talse

TRUE

FALSE

Maybe

None of the above

13. What is the name given to the volume that anyone mole of any gas occupies at S.T.P [standard temperature and pressure] and this volume is 22.4 liters?

Molar solution

Standard solution

Molar gas volume

None of the mentioned

14. To find the volume of unknown concentration using volumes of standard solutions that react together is known as

Ionic reaction

Stoichiometric reaction

Chemical reaction

Titration

15. Mention the number of atoms found in each R.A.M OR R.M.M of an element

6.02 × 105

6.02 × 1020

6.034 × 1023

6.02 × 1023

16. An equation whereby the mole ratio of the reactants and the products is represented by whole numbers is called

Chemical reactions

Reactants and products

Ionic equation

Stoichiometric equation

17. What is the name given to the amount of substance contained in one liter of a solution?

Concentration

Molarity

Molar solution

Standard solution

18. In an ionic equation, what is the name given to the ions which are converted to products and they hence take part in the reaction

Active ions

Participant ions

Spectator ions

None of the mentioned

19. Which of the following statement is correct about diluting a solution

It involves the addition of distilled water to a standard solution.

The resulting solution becomes less concentrated

The number of moles in the solution becomes the same as what was previously before the addition of distilled water.

All of the above

20. Define the relative atomic mass (R.A.M) of an element

The mass of an atom of the element as compared to 1/12 the mass of an atom of hydrogen 1 – isotope

The mass of an atom of the element as compared to 1/12 the mass of an atom of oxygen 8-isotope

The mass of an atom of the element as compared to 1/12 the mass of an atom of carbon -12 isotope.

None of the above

21. In an ionic equation, what is the name given to the ions which never take part in the reaction

Active ions

Participant ions

Spectator ions

None of the mentioned

22. Mentioned the 3 conditions that make an ionic equation written by a student absolutely correct

The equation must be balanced

The formulae of the compounds involved in the reaction must be correctly written

The physical states of the reactants and products involved should be shown.

All of the mentioned.

23. The molarity of a substance shows how much the substance in terms of moles has been dissolved in one liter (dm3) of a solution

False

Maybe

True

None of the above

24. Is the following equation TRUE OR FALSE? R.A.M =

False

Maybe

True

None of the above

25. The simplest formula of a compound which expresses its percentage composition by mass is known as

Relative atomic mass ( R.A.M)

Relative Molecular Mass ( R.M.M)

Empirical formula

Molecular formula

26. The formula which expresses the actual number of each kind of atoms of each element present in the molecule is known as

Relative atomic mass ( R.A.M)

Relative Molecular Mass ( R.M.M)

Empirical formula

Molecular formula

27. A solution that contains one mole of a substance dissolved in one liter (dm3) of a solution is known as

Concentration

Molarity

Molar solution

Standard solution

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