Course

AS Chemistry: Periodic Patterns and Industrial Chemistry (9701)

Name: AS Chemistry: Periodic Patterns and Industrial Chemistry (9701)
Price: 1799 BDT

9701 topics 9, 10, 11 and 12: Period 3 physical and chemical trends, Group 2 alkaline earth metals, Group 17 halogens, and the chemistry of nitrogen and sulfur.

24 lessons2h 23mEnglish

What you'll learn

Predict and explain physical and chemical trends across Period 3 and down Groups 2 and 17
Formulate balanced chemical and ionic equations with state symbols for all syllabus inorganic reactions
Explain differences in thermal stability and solubility using ionic charge density and lattice energetics
Relate industrial inorganic processes (Haber, Contact) and environmental pollutants to equilibrium and rate principles

Requirements

AS Chemistry topics 1–4 (atomic structure, bonding and stoichiometry)
Basic knowledge of redox oxidation numbers

Course content

24 lessons · 2h 23m

9.1-9.3 · Period 3 elements and compounds

Physical and chemical trends across Period 3: atomic radius, ionisation energies, reactions with oxygen and chlorine, acid-base properties of oxides, and chloride hydrolysis.

0/5

Atomic radius, ionisation energy and structure

Trace effective nuclear pull, understand the dips at aluminium and sulfur, and contrast melting points.

Preview7m 2.

Reactions with oxygen and chlorine

Burn Period 3 elements, observe flames and white clouds, and link group number to maximum oxidation states.

Preview6m

From basic to amphoteric to acidic oxides

Contrast strongly basic Na2O with amphoteric Al2O3 and acidic non-metal oxides across the electronegativity gradient.

Chlorides: dissolution versus hydrolysis

Contrast neutral NaCl with violent hydrolysis of SiCl4, and uncover why available 3d orbitals permit water attack.

Period 3 chemistry: exam question

Work through structured Cambridge Paper 2 questions on covalent chlorides and amphoteric aluminium oxide.

10.1 · Group 2 alkaline earth metals

Trends down Group 2: reactivity with water and steam, contrasting solubilities of hydroxides and sulfates, and the polarisation origin of carbonate and nitrate thermal stability.

0/4

Ionisation energy and reactivity with water

Trace the drop in total ionisation energy and contrast the reaction of magnesium with steam against cold water.

Preview7m 2.

Opposing solubility trends: hydroxides and sulfates

Uncover why hydroxide solubility rises while sulfate solubility drops using lattice and hydration enthalpies.

Preview7m

Thermal stability and anion polarisation

Explain why large cations stabilise carbonates and nitrates, observe brown NO2 fumes, and recall flame test colours.

Group 2 chemistry: exam question

Solve structured Cambridge Paper 2 questions on nitrate decomposition and the polarising power of cations.

11.1-11.4 · Group 17 halogens and halides

Trends in volatility, oxidising ability of halogens, reducing power of halides with sulfuric acid, diagnostic precipitation with silver nitrate, and the disproportionation of chlorine.

0/6

Volatility, dispersion forces and halogen colours

Link rising boiling points to electron cloud polarisability, and observe the deepening colours down the group.

Preview7m 2.

Halogen oxidising power and halide reducing power

Trace displacement in aqueous and organic layers, and contrast how NaCl, NaBr and NaI reduce concentrated sulfuric acid.

Preview7m

Testing halide ions with silver nitrate and ammonia

Precipitate white, cream and yellow silver halides, and distinguish them with dilute versus concentrated aqueous ammonia.

Disproportionation: water, bleach and weedkiller

Follow chlorine as it oxidises and reduces simultaneously in water purification, cold alkali and hot alkali.

The hydrogen halides

One bond enthalpy order explains both trends: thermal stability falls down the group and acid strength rises, which is why HF is the weak one.

Group 17 chemistry: exam question

Work through structured Cambridge Paper 2 questions on displacement, sulfuric acid redox and disproportionation.

12.1 · Nitrogen, sulfur and industrial chemistry

The unreactivity of nitrogen, basicity of ammonia, displacement of ammonium salts, catalytic cycles of atmospheric NOx, acid rain, and the industrial Contact process for sulfuric acid.

0/5

Ammonia, ammonium salts and basicity

Explore the pyramidal geometry and lone pair of ammonia, displace it from salts with base, and link to fertilizer chemistry.

Preview7m 2.

Atmospheric NOx and catalytic cycles

Explain why nitrogen is inert, trace the atmospheric formation of NO and NO2, and inspect catalytic converters.

Preview7m

Sulfur dioxide, acid rain and the Contact process

Understand the environmental cost of acid rain, and manipulate temperature and pressure compromises in the Contact process.

Nitrate fertilisers and eutrophication

The solubility that makes nitrate a good fertiliser is what leaches it into water. Then the sequence that ends with decomposers taking the oxygen.

Nitrogen and sulfur: exam question

Tackle structured Cambridge Paper 2 questions on Contact process conditions and the atmospheric catalytic cycle of NO2.

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