Chemistry Comprehensive Practice Test 5

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 property is typical of metals?Basic2 pts

A. Poor electrical conductivity

B. Brittleness in all forms

C. Malleability

D. Lack of lustre

2.Which functional group identifies an alcohol?Intermediate2 pts

A. –COOH

B. –OH

C. –CHO

D. –CO–

3.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

4.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

5.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

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

A. Electrical energy

B. Sound energy

C. Nuclear energy

D. Gravitational energy

7.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

8.Which particle has a positive charge?Basic2 pts

A. Electron

B. Proton

C. Neutron

D. Photon

9.The atomic number of an element equals the number of:Basic2 pts

A. Neutrons only

B. Protons only

C. Protons plus neutrons

D. Electrons plus neutrons

10.Which gas is a major product of complete combustion of a hydrocarbon?Basic2 pts

A. Carbon dioxide

B. Sodium chloride

C. Hydrogen chloride

D. Nitrogen metal

11.Which subatomic particle has approximately one atomic mass unit and no charge?Basic2 pts

A. Electron

B. Proton

C. Neutron

D. Positron

12.Which bond is typical between atoms of a metal lattice?Intermediate2 pts

A. Metallic

B. Ionic only

C. Covalent only

D. Hydrogen

13.What does concentration describe in a solution?Intermediate2 pts

A. Amount of solute relative to a specified amount of solution or solvent

B. Colour only

C. Temperature only

D. Density of the container

14.Which compound contains the –COOH functional group?Basic2 pts

A. Alkane

B. Alcohol

C. Carboxylic acid

D. Alkene

15.If a reaction releases heat to its surroundings, the reaction is:Advanced2 pts

A. Endothermic

B. Exothermic

C. Neutral only

D. Catalytic by definition

Section B — True / False

20 marks

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

16.Acids can react with some metals to release hydrogen gas.Basic2 pts

True

False

17.The nucleus contains protons and neutrons.Basic2 pts

True

False

18.Metallic bonding involves attraction between positive metal ions and delocalized electrons.Advanced2 pts

True

False

19.A mixture always has a fixed chemical formula.Basic2 pts

True

False

20.Distillation can separate liquids using differences in boiling points.Intermediate2 pts

True

False

21.Oxidation means gain of electrons in every accepted redox definition.Advanced2 pts

True

False

22.Alcohols contain a hydroxyl functional group.Basic2 pts

True

False

23.Changing the amount of a reactant can never affect reaction rate.Intermediate2 pts

True

False

24.At equilibrium, reactant and product concentrations must be equal.Advanced2 pts

True

False

25.Corrosion is generally an electrochemical oxidation process.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 smallest unit of an element that retains its chemical identity is an ______.Basic2 pts

27.The horizontal arrangement of elements by increasing atomic number is the periodic ______.Basic2 pts

28.A substance with a pH above 7 is generally ______.Basic2 pts

29.The change from solid to liquid is called ______.Basic2 pts

30.The material present in the larger amount in a solution is usually the ______.Basic2 pts

31.A reaction in which one compound breaks into simpler substances is a ______ reaction.Intermediate2 pts

32.A metal that loses electrons in a redox process is ______.Advanced2 pts

33.The number of particles in one mole is Avogadro's ______.Intermediate2 pts

34.Compounds with the same molecular formula but different arrangements can be ______.Advanced2 pts

35.A material that conducts electricity because of mobile ions is an ______.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). Nucleus

36(b). Chromatography

36(c). Metallic bonding

36(d). Carboxylic acid

36(e). Electrolyte

Column B

Metallic bonding

Carboxylic acid

Electrolyte

Nucleus

Chromatography

Section E — Short Answer

20 marks

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

41.What is a hydrocarbon?Basic4 pts

42.Why are noble gases relatively unreactive?Intermediate4 pts

43.How can chromatography help identify components of a mixture?Intermediate4 pts

44.Explain the role of a salt bridge in a galvanic cell.Advanced4 pts

45.Why can different structural arrangements produce different organic compounds with the same molecular formula?Advanced4 pts