science notes Archives - Page 2 of 32 - Free ZIMSEC & Cambridge Revision Notes

Science: Industrial gases

By garikaib|2025-02-12T09:42:59+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Dry ice has a number of industrial uses. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: Industrial gases

Common Industrial gases include:
Hydrogen
Oxygen
Nitrogen
Ammonia and
Carbon Dioxide
These gases have several industrial uses
For example oxygen […]

Comments Off

Experiment: Determining the best conditions for the production of ethanol

By garikaib|2025-02-12T09:09:40+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Fermentation of glucose ZIMSEC O Level Combined Science Notes: Experiment: Determining the best conditions for the production of ethanol

Aim: To determine the best conditions for ethanol production

Materials: 5% glucose solution, 20% glucose solution, yeast, sodium hydroxide solution, mealie meal, dilute hydrochloric acid, thermometer, conical flask, cork, glass tube, test tube, […]

Comments Off

Potential difference

By garikaib|2025-02-12T09:23:46+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A voltmeter in a circuit measuring potential difference between two points ZIMSEC O Level Combined Science Notes: Potential difference

Potential difference is the “electrical pressure” which causes current to flow in a circuit
The amount of current flowing depends on the potential difference of the circuit

[…]

Comments Off

Lead acid accumulators
Gallery
Lead acid accumulators

Notes, O Level Science Notes, Ordinary Level Notes

Lead acid accumulators

By garikaib|2025-02-12T09:40:28+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Lead acid accumulators

These act as a storage cell
Electrical energy is passed into the cells during the charging cycle
It is stored in the form of chemical energy
\text{Chemical Energy}\xrightleftharpoons[charging]{discharging} \text{Electrical Energy}
Lead acid accumulators are known as secondary cells
Secondary cells-can be recharged once the voltage drops
Charging is done […]

Comments Off

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, […]

Comments Off

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

Metals are popular construction materials
They have properties that make them suited for making diverse structures
They are ductile which means […]

Comments Off

Experiment:Finding the mechanical advantage of an inclined plane
Gallery
Experiment:Finding the mechanical advantage of an inclined plane

Notes, O Level Science Notes, Ordinary Level Notes

Experiment:Finding the mechanical advantage of an inclined plane

By garikaib|2025-02-12T09:40:29+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment:Finding the mechanical advantage of an inclined plane

Aim: Finding the Mechanical Advantage of an inclined plane

Materials: 1m long plank, sandpaper, bricks. cotton reel, nails, thick steel wire, wood block (smoothed on the underside) weights/tin and sand, pliers, string, spring balance/scales

Finding the mechanical of an inclined plane Finding the […]