Chemistry Made Easy

  WAEC Chemistry Revision Questions (True/False) - Part 5 Wrap up your final WAEC chemistry test prep with this final set of 40 true or false questions covering core syllabus material. 1. Solvation is an endothermic process when the energy required to break bonds is less than the energy released when new bonds form. False If more energy is released when new bonds form than is consumed breaking old ones, the process is exothermic (releases heat). 2. The element with atomic number 17 is a member of the halogen family. True Atomic number 17 is Chlorine, which sits in Group 7 (halogens) and has 7 valence electrons. 3. Covalent compounds generally conduct electricity in their molten states. False Covalent compounds consist of neutral molecules and lack free-moving ions or delocalized electrons to conduct electricity. 4. Carbon(II) oxide gas turns lime water milky. False Carbon(IV) oxide ($CO...

  WAEC Chemistry Revision Questions (True/False) - Part 4 Sharpen your knowledge with the final installment of our WAEC Chemistry review. Evaluate the statements and read the concise explanations. 1. Soluble salts can be recovered from their solutions by filtration. False Filtration only separates insoluble solids from a liquid. Soluble salts must be recovered using crystallization or evaporation to dryness. 2. The element with electronic configuration 2, 8, 8, 1 is a highly reactive metal. True This configuration belongs to Potassium (Group 1, Period 4), which readily loses its single valence electron to form a stable ion. 3. Electrovalent bonding involves the sharing of pairs of electrons between atoms. False Electrovalent (ionic) bonding involves the transfer of electrons from a metal to a non-metal. Covalent bonding involves the sharing of electrons. 4. Carbon(IV) oxide ($CO_2$) gas supports ...

  40 Additional WAEC Chemistry Revision Questions (True/False) - Part 3 Keep testing your chemistry readiness with part 3 of our revision series. Analyze the statement, identify if it's True or False, and check the reason why. 1. Isotopes of the same element have the same number of neutrons. False Isotopes have the same number of protons (atomic number) but different numbers of neutrons (mass number). 2. Kinetic Molecular Theory states that gas particles have perfectly elastic collisions. True An elastic collision means that no net kinetic energy is lost when the gas particles collide with each other or the container walls. 3. Silicon(IV) oxide ($SiO_2$) has a simple molecular structure with low melting points. False Quartz ($SiO_2$) has a giant covalent lattice structure (macromolecule), giving it an exceptionally high melting point. 4. The dehydration of ethanol at 170°C using concentrated $H...

  40 More WAEC Chemistry Revision Questions (True/False) - Part 2 Continue your WAEC preparation with part 2 of our core chemistry concepts quiz. Read the statement, choose True or False, and review the breakdown. 1. Isomers are compounds with the same molecular formula but different structural formulas. True Because their atoms are arranged differently, isomers often exhibit different physical and chemical properties. 2. Temporary hardness in water is caused by calcium sulfate ($CaSO_4$). False Temporary hardness is caused by calcium or magnesium hydrogen trioxocarbonate(IV), $Ca(HCO_3)_2$. Calcium sulfate causes permanent hardness. 3. Ammonia gas turns damp red litmus paper blue. True Ammonia is the only common alkaline gas encountered in the WAEC syllabus. 4. Boiling a liquid happens when its vapor pressure equals the atmospheric pressure. True This is the definition of the boiling p...

  40 Simple WAEC Chemistry Revision Questions  Test your knowledge on core WAEC Chemistry concepts. Read the statement, decide if it's True or False, and check the brief explanation below. 1. Isotopic elements have the same physical properties but different chemical properties. False Isotopes have the same chemical properties (because they have the same number of electrons) but different physical properties due to different mass numbers. 2. Dynamic equilibrium can only be achieved in a closed system. True In an open system, reactants or products can escape, preventing the forward and reverse reactions from balancing out. 3. Alkanes are unsaturated hydrocarbons. False Alkanes are saturated hydrocarbons because they contain only single carbon-carbon bonds. Alkenes and alkynes are unsaturated. 4. Oxygen gas is collected by downward displacement of water. True Oxygen is slightly solub...

  Functional Groups in Organic Chemistry Hydrocarbons 1. Alkane General Structure: R-H Example: CH₃-CH₃ (Ethane) 2. Alkene General Structure: R-CH=CH-R Example: CH₂=CH₂ (Ethene) 3. Alkyne General Structure: R-C≡C-R Example: HC≡CH (Ethyne) 4. Arenes (Aromatic) General Structure: Benzene Ring (C₆H₅-R) Example: C₆H₅-CH₃ (Toluene) Halogen & Oxygen Groups 5. Alkyl Halide General Structure: R-X (X = F, Cl, Br, I) Example: CH₃-Cl (Chloromethane) 6. Alcohol General Structure: R-OH Example: CH₃-CH₂-OH (Ethanol) 7. Phenol General Structure: C₆H₅-OH Example: Phenol 8. Ether General Structure: R-O-R' Example: CH₃-O-CH₃ (Dimethyl Ether) Carbonyl Compounds 9. Aldehyde General Structure: R-CHO Example: CH₃-CHO (Ethanal) 10. Ketone General Structur...

  Alkanoic Acids Alkanoic Acids (Carboxylic Acids): These are homologous series of organic compounds containing the carboxyl functional group (—COOH) attached to an alkyl group or a hydrogen atom. They have the general molecular formula C n H 2n+1 COOH (where n = 0, 1, 2...). Alkanoates (Esters): These are organic compounds formed when the hydroxyl (—OH) group of an alkanoic acid is replaced by an alkoxy (—OR) group from an alkanol. They contain the functional group (—COOR) and are characterized by sweet, fruity smells. Esterification: This is the reversible reaction between an alkanoic acid and an alkanol in the presence of a mineral acid catalyst (such as concentrated H 2 SO 4 ) to yield an alkanoate (ester) and water. Saponification: This is the alkaline hydrolysis of fats and oils (long-chain alkanoates) using a strong base like NaOH or KOH to produce propane-1,2,3-triol (glycerol) and the sodium or potassium salt of the fatt...