Chemistry Comprehensive Practice Test 1

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 particle has a positive charge?Basic2 pts

A. Electron

B. Proton

C. Neutron

D. Photon

2.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

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

A. Ionic

B. Covalent

C. Metallic

D. Hydrogen

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

A. Molecule

B. Compound

C. Atom

D. Reaction

5.A solution with pH 3 is:Basic2 pts

A. Strongly acidic

B. Neutral

C. Weakly basic

D. Strongly basic

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

A. Filtration

B. Distillation

C. Chromatography

D. Sublimation

7.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

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

A. Cathode

B. Anode

C. Salt bridge only

D. Electrolyte surface only

9.Which property is typical of metals?Basic2 pts

A. Poor electrical conductivity

B. Brittleness in all forms

C. Malleability

D. Lack of lustre

10.Which substance is commonly used as a base in household cleaning?Intermediate2 pts

A. Sodium hydroxide

B. Carbon dioxide

C. Sodium chloride

D. Oxygen

11.Across a period, atomic radius generally decreases because:Advanced2 pts

A. Nuclear charge increases while shielding changes little

B. More electron shells are added

C. Protons disappear

D. The nucleus becomes less positive

12.Which equation represents neutralization?Intermediate2 pts

A. HCl + NaOH → NaCl + H₂O

B. NaCl → Na + Cl

C. C + O₂ → CO₂

D. CaCO₃ → CaO + CO₂

13.What is the main solute in a salt-water solution?Basic2 pts

A. Water

B. Sodium chloride

C. Oxygen

D. Hydrogen

14.Which hydrocarbon contains a carbon-carbon double bond?Intermediate2 pts

A. Alkane

B. Alkene

C. Alcohol

D. Carboxylic acid

15.During electrolysis of an aqueous ionic solution, positive ions generally move toward the:Advanced2 pts

A. Anode

B. Cathode

C. Salt bridge

D. Voltmeter

Section B — True / False

20 marks

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

16.An acid has a pH below 7 at 25 °C.Basic2 pts

True

False

17.Neutrons carry a negative electrical charge.Basic2 pts

True

False

18.Ionic compounds are formed through electron transfer and electrostatic attraction.Intermediate2 pts

True

False

19.A catalyst is permanently consumed during a reaction.Intermediate2 pts

True

False

20.Filtration can separate a soluble solid from water after it has completely dissolved.Basic2 pts

True

False

21.Oxidation and reduction occur together in a redox reaction.Advanced2 pts

True

False

22.A mole is a counting unit for particles.Basic2 pts

True

False

23.Alkenes contain at least one carbon-carbon double bond.Intermediate2 pts

True

False

24.Boiling is a chemical change because a new substance is always formed.Basic2 pts

True

False

25.In a galvanic cell, a spontaneous redox reaction can produce electrical energy.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 negatively charged subatomic particle is the ______.Basic2 pts

27.A substance that increases hydrogen-ion concentration in water is an ______.Basic2 pts

28.The horizontal rows of the periodic table are called ______.Basic2 pts

29.The number of protons in an atom is its atomic ______.Basic2 pts

30.The process in which a solid changes directly to a gas is called ______.Intermediate2 pts

31.A bond formed by transfer of electrons is an ______ bond.Basic2 pts

32.The amount of substance containing 6.02 × 10²³ particles is one ______.Intermediate2 pts

33.The electrode at which reduction occurs is the ______.Advanced2 pts

34.The reaction of an acid with a base is called ______.Basic2 pts

35.Compounds containing carbon and hydrogen only are 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). pH

36(b). Mole

36(c). Catalyst

36(d). Anode

36(e). Alkene

Column B

Catalyst

Anode

Alkene

Mole

Section E — Short Answer

20 marks

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

41.Explain why an atom is electrically neutral when it has equal numbers of protons and electrons.Basic4 pts

42.Distinguish between an element and a compound.Basic4 pts

43.Why does increasing temperature often increase reaction rate?Intermediate4 pts

44.Explain oxidation and reduction in terms of electron transfer.Advanced4 pts

45.Describe how a galvanic cell converts chemical energy into electrical energy.Advanced4 pts