Chemistry Comprehensive Practice Test 4

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.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

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

A. Cathode

B. Anode

C. Salt bridge only

D. Electrolyte surface only

3.Which property is typical of metals?Basic2 pts

A. Poor electrical conductivity

B. Brittleness in all forms

C. Malleability

D. Lack of lustre

4.Which functional group identifies an alcohol?Intermediate2 pts

A. –COOH

B. –OH

C. –CHO

D. –CO–

5.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

6.If 2 mol of H₂ react completely with O₂ according to 2H₂ + O₂ → 2H₂O, how many moles of H₂O form?Intermediate2 pts

A. 1

B. 2

C. 3

D. 4

7.Which statement best explains why catalysts speed many reactions?Advanced2 pts

A. They permanently increase product energy

B. They provide an alternative pathway with lower activation energy

C. They change the equilibrium constant in every reaction

D. They are consumed as reactants

8.In a galvanic cell, chemical energy is primarily converted into:Intermediate2 pts

A. Electrical energy

B. Sound energy

C. Nuclear energy

D. Gravitational energy

9.Which pair is most likely to form a covalent molecular compound?Intermediate2 pts

A. Sodium and chlorine

B. Magnesium and oxygen

C. Carbon and oxygen

D. Potassium and bromine

10.Which indicator is commonly used to distinguish acidic and alkaline solutions by colour?Basic2 pts

A. Universal indicator

B. Copper wire

C. Sodium chloride

D. Sand

11.Why are noble gases generally unreactive?Intermediate2 pts

A. They have no electrons

B. Their outer electron shells are relatively complete

C. They contain no protons

D. They are all metals

12.Which substance is a giant covalent structure?Advanced2 pts

A. Diamond

B. Sodium chloride

C. Copper

D. Water

13.What is the purpose of a coefficient in a chemical equation?Intermediate2 pts

A. To change an element's identity

B. To balance the number of atoms

C. To remove products

D. To change atomic number

14.Which process can obtain a solvent from a solution while leaving dissolved solid behind?Basic2 pts

A. Evaporation

B. Filtration

C. Magnetic separation

D. Decantation only

15.Which statement about a dynamic equilibrium is correct?Advanced2 pts

A. The reaction stops completely

B. Forward and reverse reaction rates are equal

C. All reactants disappear

D. Only products are present

Section B — True / False

20 marks

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

16.Noble gases have relatively complete outer electron shells.Intermediate2 pts

True

False

17.All metals are liquids at room temperature.Basic2 pts

True

False

18.A catalyst lowers the activation energy of an alternative reaction pathway.Advanced2 pts

True

False

19.Chromatography can help separate and identify components of a mixture.Intermediate2 pts

True

False

20.The mole concept connects microscopic particles with measurable amounts.Intermediate2 pts

True

False

21.Water is an element.Basic2 pts

True

False

22.An exothermic reaction transfers heat to the surroundings.Intermediate2 pts

True

False

23.A saturated solution contains more dissolved solute than it can hold at that temperature.Advanced2 pts

True

False

24.Hydrocarbons contain only carbon and hydrogen.Basic2 pts

True

False

25.Electrolysis requires electrical energy to drive a non-spontaneous chemical change.Advanced2 pts

True

False

Section C — Fill in the Blank

20 marks

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

26.The positively charged subatomic particle is the ______.Basic2 pts

27.A particle with the same number of protons but a different number of electrons is an ______.Intermediate2 pts

28.The attraction between oppositely charged ions is characteristic of ______ bonding.Basic2 pts

29.When a substance burns completely in oxygen, the process is called ______.Basic2 pts

30.The separation technique based on different boiling points is ______.Basic2 pts

31.The quantity of solute per specified quantity of solution is called ______.Intermediate2 pts

32.The loss of electrons is called ______.Advanced2 pts

33.The gain of electrons is called ______.Advanced2 pts

34.The simplest alkene is ______.Intermediate2 pts

35.A reaction that releases heat is called ______.Intermediate2 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). Ionic bond

36(b). Distillation

36(c). Reduction

36(d). Hydrocarbon

36(e). Equilibrium

Column B

Reduction

Hydrocarbon

Equilibrium

Ionic bond

Distillation

Section E — Short Answer

20 marks

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

41.What is a catalyst?Basic4 pts

42.Explain the difference between physical and chemical change.Basic4 pts

43.Why do metals conduct electricity well?Intermediate4 pts

44.Describe what happens at the anode and cathode in a redox cell.Advanced4 pts

45.Explain what dynamic equilibrium means in a reversible reaction.Advanced4 pts