Course

O Level Chemistry: Reactions, Redox and the Periodic Table (5070)

Name: O Level Chemistry: Reactions, Redox and the Periodic Table (5070)
Price: 1699 BDT

5070 topics 4 to 8. The foundation module says what a substance is; this one uses electron transfer, energy, collision and periodic rules to predict what it does.

61 lessons5h 52mEnglish

What you'll learn

Say what makes a solution acidic, and keep a weak acid apart from a dilute one
Choose the right preparation for a soluble salt and for an insoluble one, and give the reason
Name what is oxidised and what is reduced, and support it with an oxidation number
Predict the product at each electrode, then write the half-equation that produced it
Explain a change of rate by collisions, and say why a catalyst changes the rate but not the yield
Predict how an element reacts from its group, instead of recalling a list of reactions
Use the reactivity series to say how a given metal has to be extracted

Requirements

The mole, module one chapter 4: moles from a mass and from a concentration, and the ratio in a balanced equation
Electron shells, module one chapter 2: how an atom becomes an ion, and where an element sits in the table
Bonding, module one chapter 3: ionic and covalent bonding, and what breaking a bond costs
The particle model, module one chapter 1: particles move, and they move faster when it is hotter
Comfortable with fractions, decimals and simple rearranging
A periodic table and a calculator beside you

Course content

61 lessons · 5h 52m

7.1-7.3 · Acids, bases and salts

Acids are hydrogen ions in water, and every reaction in this chapter follows from that. Ends on the two ways a salt is actually made in a school laboratory, one for soluble salts and one for insoluble ones.

0/13

What makes a solution acidic

Dry acid gas leaves litmus alone. Predict what the water made possible.

Preview5m 2.

The pH scale and indicators

Order lemon juice, tap water and soap by pH, then read the scale properly.

Preview6m

Dilute is not the same as weak

Add water to a concentrated strong acid and predict whether it becomes weak.

Is a neutralised solution always pH 7?

Add measured antacid doses and connect the rising pH to hydrogen ions being removed.

A titration calculation in four lines

20.0 cm³ of acid neutralises 25.0 cm³ of alkali. Find the concentration of the alkali.

Neutralisation gives out heat

Predict the thermometer, then read the energy change off the profile.

Acid and metal give a salt and hydrogen

Name the gas coming off magnesium in acid, and the test that proves it.

Why baking soda fizzes in vinegar

Mix baking soda with acid, observe the gas and identify it using limewater.

Basic, acidic and amphoteric oxides

Decide what fixes the kind of oxide an element forms, then find the two that do both.

10.

Making an insoluble salt

Two clear solutions are mixed. Predict what appears, then learn precipitation.

11.

Choose the route to a pure salt

Choose the method from solubility, then prepare three salts using real apparatus decisions.

12.

One exam question, end to end

Eight marks, four parts, no options: why excess, how to filter, then moles and the mass made.

13.

Quick revision: acids, bases and salts

A one-screen summary plus a spaced-recall flashcard deck, for coming back to before an exam.

4.1-4.2, 6.4 · Redox and electrolysis

Oxidation and reduction are one electron transfer described from two sides. That single idea explains rusting, a cell that lights a lamp, the zinc on a roofing sheet, and every electrode in an electrolysis cell.

0/15

What rusting adds to the iron

Predict what happens to the mass as a roof rusts, then balance the reaction.

Preview6m 2.

Oxidation is loss of electrons

Magnesium behaves the same way with oxygen and with chlorine. Say what it is doing.

Preview6m

Oxidation number makes the change visible

Number every atom in a formula, then read oxidation and reduction off the change.

The reactivity series, read as a voltage

Zinc against copper: predict which metal gives up its electrons first.

How a simple cell drives a current

Predict the direction of electron flow in the wire, then name each electrode.

Why a galvanised roof survives a scratch

Zinc on iron, then copper on iron. One protects and one makes rusting worse.

A hydrogen fuel cell powers a vehicle

Trace hydrogen and oxygen to electrical energy and water, then compare the system with a petrol engine.

Two ways for a current to pass

Copper wire, solid salt and molten salt. Decide what moves inside each one.

Which ion goes to which electrode

Predict which particles travel to the negative rod, then fix cation and anion.

10.

Half-equations at the two electrodes

Molten lead(II) bromide, written out one electrode at a time with the electrons shown.

11.

Three aqueous electrolysis cases

Compare concentrated brine and copper(II) sulfate with inert or copper electrodes.

12.

Two volumes of hydrogen to one of oxygen

Predict how the two collected gas volumes compare, then read it off the equation.

13.

Electroplating a spoon with copper

About 20 mg a minute. Predict the mass after six, then name each electrode.

14.

One exam question, end to end

Seven marks, four parts, no options: the cathode product, the anode half-equation, why solids fail.

15.

Quick revision: redox and electrolysis

A one-screen summary plus a spaced-recall flashcard deck, for coming back to before an exam.

5.1, 6.1-6.3 · Energy changes and rates of reaction

Where the energy of a reaction goes, and what decides how fast it gets there. Every rate factor in the paper changes one of two things: how often particles collide, or what fraction of collisions has enough energy.

0/16

Did the substance really change?

Solve four quick cases and unlock the reliable test for a chemical change.

Preview6m 2.

Why a gas burner heats the pan

Place the products on the energy diagram, then read exothermic off the drop.

Preview6m

A reaction that makes the beaker cold

An instant cold pack, and the profile where the products sit above the reactants.

Measuring the energy released

100 g of water and a rise of 20 °C. Predict the energy, then meet mass × c × ΔT.

Bonds broken against bonds made

Decide the sign before you calculate it, then work it from three bond energies.

Why a gas and air mixture needs a spark

Say what the spark supplied, then separate the barrier from the energy change.

A reaction needs a collision

Two particles in one beaker and no reaction. Predict what still has to happen.

Ten degrees roughly doubles the rate

Guess the size of the effect, then name the two things heating changes.

Concentration changes the rate, not the yield

Double the acid concentration and predict what changes: speed, total gas, or both.

10.

Reading a rate off a graph

Decide where a gas-volume curve is steepest, then take a gradient there.

11.

A catalyst is not used up

Predict whether the manganese(IV) oxide survives, then say what it changes.

12.

The crystal that remembers water

Use heat and water to reverse a crystal colour loop and decode the dot formula.

13.

A colour that stops changing

Decide whether the reaction stopped, then stress the flask and watch it answer.

14.

Run the sulfur trioxide converter

Commission the Contact process, then defend its temperature, pressure and catalyst choices.

15.

One exam question, end to end

Seven marks, three parts, no options: the gas volume, the effect of concentration, then why.

16.

Quick revision: energy changes and rates of reaction

A one-screen summary plus a spaced-recall flashcard deck, for coming back to before an exam.

8.1-8.5, 9.1-9.6 · The periodic table in use: groups, transition metals and metals

Group I, Group VII, Group 0 and the transition metals, each explained by the outer shell rather than learned as a list. Ends at the lime kiln, where a mole calculation says how much quicklime a load of limestone gives.

0/13

What the elements in a column share

Predict what links lithium, sodium and potassium, then read a group off the table.

Preview5m 2.

Group I: one outer electron

Say how many electrons sodium must lose, then meet the alkali metals.

Preview5m

Why potassium is fiercer than lithium

Predict the trend down Group I, then explain it with distance and shielding.

The reactivity series, and how metals are extracted

Magnesium against copper in acid, then the rule that decides carbon or electrolysis.

Group VII: seven outer electrons

Predict what a chlorine atom needs, then meet the halogens and their colours.

Why a halogen comes in pairs

Two chlorine atoms, neither giving. Predict what they do, then meet displacement.

Group VII runs the other way

Predict the trend down the halogens, then say why it is the reverse of Group I.

Group 0: single atoms, no reactions

Predict how many atoms are in a molecule of argon, then say why it does nothing.

What makes a transition metal different

Iron against sodium: predict which packs more tightly, then list the four differences.

10.

Transition metals as catalysts

Decide whether iron in the Haber process raises the rate, the yield, or both.

11.

The lime kiln, in figures

Predict what 100 g of limestone leaves behind, then name the reaction and the product.

12.

One exam question, end to end

Eight marks, four parts, no options: a kiln load of limestone, then one Group I comparison.

13.

Quick revision: groups, transition metals and metals

A one-screen summary plus a spaced-recall flashcard deck, for coming back to before an exam.

About the creator

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