Ordinary Level Notes Archives - Page 3 of 180 - Free ZIMSEC & Cambridge Revision Notes

Experiment: Determining how concentration affects rates of reaction

By garikaib|2025-02-12T09:14:48+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

The rate of reaction increases with an increase in concentration ZIMSEC O Level Combined Science Notes: Experiment: Determining how concentration affects rates of reaction

Aim: To find the effects of concentration on the rate of reaction using hydrochloric acid and sodium thiosulphate

Materials: 250cm³ beaker, […]

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Experiment: Reduction of copper using carbon
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Experiment: Reduction of copper using carbon

Notes, O Level Science Notes, Ordinary Level Notes

Experiment: Reduction of copper using carbon

By garikaib|2025-02-12T09:30:04+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Extraction of copper from oxides

Aim: To investigate the reduction of copper oxide using carbon

Materials: copper oxide, anhydrous sodium carbonate, charcoal block, blow pipe, burner

The reduction of copper using carbon.

Method

Mix a little copper oxide with sodium carbonate
Place […]

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Uses of Industrial gases

By garikaib|2025-02-12T09:44:18+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Sacks of fertilizer. Image credit forgottenvoices.org ZIMSEC O Level Combined Science Notes: Uses of Industrial gases

Industrial gases have many industrial uses
The table below lists some of the common uses of gases

To access more topics go to the Combined Science Notes […]

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Fuel efficiency
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Fuel efficiency

Notes, O Level Science Notes, Ordinary Level Notes

Fuel efficiency

By garikaib|2025-02-12T09:11:15+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Fuel efficiency

Fuel efficiency measures the amount of energy that can be obtained from a given quantity of fuel
It is often useful to know which fuel gives the most energy(heat) per given unit
In a laboratory fuel efficiency can be determined by measuring the temperature rise of water when it is […]

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Ohm’s Law
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Ohm’s Law

Notes, O Level Science Notes, Ordinary Level Notes

Ohm’s Law

By garikaib|2025-02-12T09:25:59+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Ohm’s Law

It gives the relationship between potential difference and current through a wire in a circuit
According to the law:
\text{potential difference}\propto\text{current}
The current passing through a wire is proportional to the potential difference across its ends
Provided the temperature remains constant
An equation can thus be formed:
constant\dfrac{\text{potential difference(V)}}{\text{current […]

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The Ampere-Hour
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The Ampere-Hour

Notes, O Level Science Notes, Ordinary Level Notes

The Ampere-Hour

By garikaib|2025-02-12T09:41:23+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: The Ampere-Hour

It is used to measure the current capacity of cells and batteries
is the amount of energy charge in a battery/cell that will allow one ampere of current to flow for one hour
It is thus a unit of measuring a cell/battery’s charge
For example if a battery is rated as […]

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Experiment: Demonstrating the effects of short-circuits and overloads

By garikaib|2025-02-12T09:06:51+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Demonstrating how fuses work ZIMSEC O Level Combined Science Notes: Experiment: Demonstrating the effects of short-circuits and overloads

Aim: To demonstrate the effect of a short circuit/overloading of a circuit on a fuse

Materials: 6 or 12 V battery, copper wires, fuse wire/steel wool strand, switch, car headlamp, torch bulb, switch, […]

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Metal and metal alloy properties and their construction uses

By garikaib|2025-02-12T09:21:53+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Metals are popular in construction. Image credit traveldigg.com ZIMSEC O Level Combined Science Notes: Metal and metal alloy properties and their construction uses