Chemistry Comprehensive Practice Test 2

Questions

100

Marks

Sections

100%

Auto-Graded

Section	Questions	Marks Each	Total
A — Multiple Choice	15	2	30
B — True / False	10	2	20
C — Fill in the Blank	10	2	20
D — Column Matching	5 sub-questions	2	10
E — Short Answer	5	4	20
Total	45	—	100

Source scope: This paper covers the 12 Chemistry articles currently in the EDUSAMBAM master library: Acids, Bases and Salts: The Chemistry of Sour, Bitter, and Neutral; Atoms and the Periodic Table: The Building Blocks of Everything; Chemical Bonding: How Atoms Connect to Form Everything; Chemical Reactions and Equations: The Language of Change; Chemistry in Everyday Life: The Science Hiding in Plain Sight; Electrochemistry: Where Chemistry Meets Electricity; Chemistry of Metals and Non-Metals: A Tale of Two Families; Mixtures and Solutions: How Substances Combine Without Reacting; The Mole and Chemical Calculations: Counting the Uncountable; Organic Chemistry Basics: The Chemistry of Carbon; States of Matter and Changes: Why Substances Transform; What is Chemistry? The Science of Matter and Change. Questions progress from basic concepts to intermediate application and advanced reasoning.

Section A — Multiple Choice

30 marks

15 questions · 2 marks each. Select the best answer.

1.Which type of bond is formed mainly by transfer of electrons?Basic2 pts

A. Ionic

B. Covalent

C. Metallic

D. Hydrogen

2.A balanced chemical equation must have the same number of each type of:Basic2 pts

A. Molecule

B. Compound

C. Atom

D. Reaction

3.A solution with pH 3 is:Basic2 pts

A. Strongly acidic

B. Neutral

C. Weakly basic

D. Strongly basic

4.Which method is most suitable for separating an insoluble solid from a liquid?Basic2 pts

A. Filtration

B. Distillation

C. Chromatography

D. Sublimation

5.One mole contains approximately:Intermediate2 pts

A. 6.02 × 10²³ particles

B. 9.81 × 10² particles

C. 3.00 × 10⁸ particles

D. 1.60 × 10⁻¹⁹ particles

6.Oxidation at an electrode occurs at the:Intermediate2 pts

A. Cathode

B. Anode

C. Salt bridge only

D. Electrolyte surface only

7.Which property is typical of metals?Basic2 pts

A. Poor electrical conductivity

B. Brittleness in all forms

C. Malleability

D. Lack of lustre

8.Which functional group identifies an alcohol?Intermediate2 pts

A. –COOH

B. –OH

C. –CHO

D. –CO–

9.At constant pressure, heating a liquid generally causes its particles to:Basic2 pts

A. Lose all motion

B. Gain kinetic energy

C. Become neutrons

D. Stop colliding

10.Which acid is naturally present in vinegar?Basic2 pts

A. Hydrochloric acid

B. Ethanoic acid

C. Sulfuric acid

D. Nitric acid

11.Isotopes of an element have the same number of:Intermediate2 pts

A. Neutrons

B. Protons

C. Nucleons

D. Mass units

12.A molecule of water contains:Basic2 pts

A. One H atom and two O atoms

B. Two H atoms and one O atom

C. Two H atoms and two O atoms

D. One H atom and one O atom

13.Which change is usually physical rather than chemical?Basic2 pts

A. Rusting iron

B. Burning methane

C. Melting ice

D. Reacting acid with metal

14.What happens to the boiling point of a pure liquid when external pressure decreases?Intermediate2 pts

A. It usually decreases

B. It always increases

C. It becomes zero

D. It cannot change

15.For a fixed amount of gas at constant temperature, pressure increases when volume:Advanced2 pts

A. Increases

B. Decreases

C. Stays unrelated

D. Becomes infinite

Section B — True / False

20 marks

10 questions · 2 marks each. Choose True or False.

16.An element is made of atoms with the same number of protons.Basic2 pts

True

False

17.Isotopes of an element necessarily have the same number of neutrons.Intermediate2 pts

True

False

18.A covalent bond involves attraction associated with shared electrons.Intermediate2 pts

True

False

19.Increasing temperature generally increases the average kinetic energy of particles.Basic2 pts

True

False

20.A solution is always a heterogeneous mixture.Basic2 pts

True

False

21.At constant temperature, decreasing gas volume can increase pressure.Advanced2 pts

True

False

22.The atomic number changes when an atom becomes an ion.Advanced2 pts

True

False

23.Neutralization commonly produces water and a salt.Basic2 pts

True

False

24.Metal atoms generally tend to form positive ions.Intermediate2 pts

True

False

25.Endothermic processes absorb energy from their surroundings.Intermediate2 pts

True

False

Section C — Fill in the Blank

20 marks

10 questions · 2 marks each. Type the missing term or value.

26.The central part of an atom is the ______.Basic2 pts

27.Atoms of the same element with different numbers of neutrons are called ______.Intermediate2 pts

28.A bond formed by sharing electrons is a ______ bond.Basic2 pts

29.The change from liquid to gas at the surface of a liquid is ______.Basic2 pts

30.The substance that dissolves another substance is the ______.Basic2 pts

31.The maximum amount of solute that can dissolve under specified conditions is related to ______.Intermediate2 pts

32.A reaction that absorbs heat from its surroundings is ______.Intermediate2 pts

33.The electrode where oxidation occurs is the ______.Advanced2 pts

34.A substance that speeds a reaction without being permanently consumed is a ______.Intermediate2 pts

35.The functional group –OH is called the ______ group.Basic2 pts

Section D — Matching

10 marks

5 sub-questions · 2 marks each. Match each sub-question in Column A with the correct entry in Column B.

36.Match each term in Column A with the correct description in Column B.Advanced10 pts

Column A

36(a). Isotope

36(b). Solvent

36(c). Covalent bond

36(d). Cathode

36(e). Exothermic

Column B

Covalent bond

Cathode

Exothermic

Isotope

Solvent

Section E — Short Answer

20 marks

5 questions · 4 marks each. Answer in one or two clear sentences.

41.What is the difference between an atom and an ion?Basic4 pts

42.Why can isotopes have different masses but similar chemical behaviour?Intermediate4 pts

43.Explain the difference between a solution and a suspension.Intermediate4 pts

44.What is activation energy and why does a catalyst matter?Advanced4 pts

45.Explain why decreasing the volume of a gas at constant temperature can increase its pressure.Advanced4 pts