Videos
International Baccalaureate · IB Diploma · Chemistry · SL
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11 video lessons
4:00
Introduction to the particulate nature of matter
A sealed gas container changes pressure when heated. Celsius ratios cannot predict the pressure change b…
3:51
The nuclear atom
A salt crystal conducts when dissolved but not when solid. The ions exist in both states; their ability …
4:01
Counting particles by mass: the mole
The smallest mass of reactant is not necessarily the limiting reagent 限量试剂. The balanced equation compar…
3:48
Functional groups: classification of organic compounds
Two compounds can have the same molecular formula but different structures. Their functional groups 官能团 …
4:07
Measuring enthalpy change
A cup warms when two solutions react. The temperature rise measures energy transferred to the surroundin…
4:08
Energy from fuels
A reusable container can require more energy to manufacture than a single-use one. Its impact depends on…
4:31
How much? The amount of chemical change
A burette reading is not the delivered volume. The titre 滴定体积 is the difference between final and initia…
3:47
How fast? The rate of chemical change
A faster reaction finishes sooner, but it need not make more product. Rate 速率 and final yield answer dif…
3:50
How far? The extent of chemical change
A reversible reaction 可逆反应 can continue in a closed vessel while measured concentrations stay constant. …
3:37
Electron transfer reactions
An aqueous salt solution can produce different electrode products from the molten salt. Water introduces…
4:07
Experimental programme
A line passing near every data point is useful, but its gradient can still be uncertain. A graph is evid…