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2026 Statistics
Key Facts: BSSE Chemistry 1429 Exam
1429
BEC Exam ID
Botswana Examinations Council
40
Paper 1 MCQs
BEC Exam Structure
45m
Paper 1 Duration
BEC Exam Timetable
Grade C
Benchmark Pass
Botswana Senior Secondary Standard
100
Practice Questions
OpenExamPrep Bank
Botswana BSSE Chemistry 1429 is administered by the Botswana Examinations Council (BEC) for senior secondary students. The exam assesses key chemical principles across atomic structure, quantitative stoichiometry calculations, energetics, acid-base titrations, and organic functional groups. This 100-question practice bank provides full preparation aligned with the outcome-based BSSE 1429 standard.
Sample BSSE Chemistry 1429 Practice Questions
Try these sample questions to test your BSSE Chemistry 1429 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1How many protons, neutrons, and electrons are present in a neutral atom of chlorine-37 (atomic number 17)?
A.17 protons, 20 neutrons, 17 electrons
B.17 protons, 17 neutrons, 20 electrons
C.20 protons, 17 neutrons, 17 electrons
D.17 protons, 37 neutrons, 17 electrons
Explanation: The atomic number (17) determines the number of protons, which equals the number of electrons in a neutral atom. The number of neutrons is calculated by subtracting the atomic number from the mass number (37 - 17 = 20).
2Which particle is found in the nucleus of an atom and carries no electrical charge?
A.Neutron
B.Proton
C.Electron
D.Positron
Explanation: Neutrons are subatomic particles located within the atomic nucleus that have a relative mass of 1 and a neutral charge of 0. Protons carry a positive charge and electrons carry a negative charge.
3What is the electronic configuration of a neutral potassium atom (Z = 19)?
A.2,8,8,1
B.2,8,9
C.2,8,7,2
D.2,18,1
Explanation: Potassium has 19 electrons. Electons fill shells in order of increasing energy: 2 in the first shell, 8 in the second, 8 in the third, and the remaining 1 in the fourth shell (2,8,8,1).
4Which pair of subatomic species represents isotopes of the same element?
A.Carbon-12 and Carbon-14
B.Nitrogen-14 and Carbon-14
C.Sodium-23 and Sodium ion (Na+)
D.Oxygen-16 and Fluorine-19
Explanation: Isotopes are atoms of the same element with the same atomic number (number of protons) but different mass numbers (number of neutrons). Carbon-12 and Carbon-14 both have 6 protons but 6 and 8 neutrons, respectively.
5Elements in the same Group of the Periodic Table exhibit similar chemical properties primarily because they have:
A.The same number of valence electrons
B.The same number of electron shells
C.Identical atomic masses
D.Equal numbers of neutrons
Explanation: Elements in the same vertical group have the same number of outer-shell (valence) electrons, which determines their chemical reactivity and bonding characteristics.
6Chlorine consists of two naturally occurring isotopes: 75% chlorine-35 and 25% chlorine-37. What is the relative atomic mass (Ar) of chlorine?
A.35.5
B.36.0
C.35.0
D.37.0
Explanation: The relative atomic mass is the weighted average: (35 × 0.75) + (37 × 0.25) = 26.25 + 9.25 = 35.5.
7Across Period 3 from Sodium to Chlorine, the atomic radius generally decreases because:
A.Nuclear charge increases while electron shielding remains constant
B.The number of electron shells increases across the period
C.Valence electrons are lost, leaving smaller cation cores
D.Electronegativity decreases across the period
Explanation: As you move left to right across Period 3, protons are added to the nucleus (increasing nuclear charge), while electrons are added to the same principal energy level (shielding remains nearly constant). The stronger electrostatic attraction pulls outer electrons closer.
8Why does the reactivity of Group 1 alkali metals increase down the group from Lithium to Potassium?
A.Atomic radius increases, reducing attraction between nucleus and valence electron
B.Nuclear charge decreases down the group
C.Electrons are gained more easily as shielding decreases
D.Group 1 metals form covalent bonds more readily down the group
Explanation: Down Group 1, additional electron shells increase atomic radius and electron shielding. The single outer electron is farther from the nucleus and less strongly held, making it easier to lose.
9What is observed when chlorine gas is bubbled into an aqueous solution of potassium bromide?
A.The solution turns reddish-brown as bromine is displaced
B.A purple vapor is evolved as iodine is formed
C.A white precipitate of potassium chloride forms
D.No chemical change occurs because bromine is more reactive than chlorine
Explanation: Chlorine is more reactive than bromine (higher up Group 7). Chlorine displaces bromide ions from solution: Cl2 (g) + 2KBr (aq) → 2KCl (aq) + Br2 (aq), forming aqueous bromine which appears reddish-brown.
10Which characteristic is typical of transition metals such as Iron and Copper, compared to Group 1 metals?
A.Formation of colored compounds and variable oxidation states
B.Low melting points and low densities
C.Vigorous reaction with cold water producing hydrogen gas
D.Formation of soft, easily cut metallic crystals
Explanation: Transition metals exhibit characteristic properties including variable oxidation states (e.g. Fe2+ and Fe3+), formation of colored compounds, high densities, high melting points, and catalytic behavior.
About the BSSE Chemistry 1429 Practice Questions
Verified exam format metadata for Botswana Senior Secondary Education Certificate Chemistry (Exam ID: 1429) is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.