BGCSE Chemistry 0570 study guide
BGCSE Chemistry 0570 · Work through your exam, one topic at a time.
BGCSE Chemistry 0570 is a secondary-school science qualification taken in Botswana, typically at the end of the two-year senior secondary cycle. It is designed for learners who need a solid grounding in chemistry either as a terminal science subject or as preparation for further study in the physical and biological sciences, health-related fields, engineering, agriculture and applied technology. The BGCSE Chemistry 0570 study guide has 10 sections and about 3,302 words.
01Particulate Nature of Matter
All matter is made of particles (atoms, ions or molecules) in constant motion. The kinetic particle model explains the three states: in solids, particles are closely packed in fixed positions and only vibrate; in liquids, they are close but can slide past one another; in gases, they are far apart and move rapidly and randomly.
328 words, about 2 min02States of Matter and Kinetic Theory
Kinetic theory links the energy of particles to the state of a substance. Melting , boiling , evaporation , condensation and freezing are changes of state, and they are physical changes because no new substance is formed.
324 words, about 2 min03Atomic Structure
An atom has a small, dense nucleus containing protons (relative charge +1, mass 1) and neutrons (charge 0, mass 1), surrounded by electrons (charge −1, negligible mass) in shells. The proton number (atomic number) is the number of protons and identifies the element.
274 words, about 1 min04Periodic Table and Chemical Bonding
The Periodic Table arranges elements by increasing proton number. Groups are vertical columns with the same number of outer electrons and similar properties; periods are horizontal rows.
290 words, about 1 min05Formulae, Equations and the Mole Concept
A chemical formula shows the ratio of atoms in a compound. A word equation names reactants and products; a symbol equation uses formulas and must be balanced so atoms are conserved.
249 words, about 1 min06Acids, Bases, Salts and Reaction Rates
An acid releases H⁺ ions in water; a base neutralises an acid; an alkali is a soluble base releasing OH⁻ ions. The pH scale runs 0–14, with acids below 7 and alkalis above 7.
286 words, about 1 min07Electrochemistry, Oxidation and Reduction
Electrolysis uses electrical energy to decompose an ionic compound. The cathode is negative and attracts positive ions (cations), where reduction occurs (gain of electrons).
246 words, about 1 min08Energetics and Chemical Equilibrium
Exothermic reactions release energy to the surroundings (temperature rises); endothermic reactions absorb energy (temperature falls). Enthalpy change is the energy transferred at constant pressure; activation energy is the minimum energy needed to start a reaction.
252 words, about 1 min09Metals, Extraction and Properties of Materials
The reactivity series ranks metals by their tendency to lose electrons. Metals above carbon are extracted by electrolysis ; metals below carbon can be reduced by carbon .
262 words, about 1 min10Organic Chemistry and Fuels
Organic chemistry is the chemistry of carbon compounds. Hydrocarbons contain only carbon and hydrogen.
791 words, about 4 min