O Level Science Notes Archives - Page 6 of 33 - Free ZIMSEC & Cambridge Revision Notes

Experiment: Demonstrate the effect of surface area on the rate of a reaction
Gallery
Experiment: Demonstrate the effect of surface area on the rate of a reaction

Notes, O Level Science Notes, Ordinary Level Notes

Experiment: Demonstrate the effect of surface area on the rate of a reaction

By garikaib|2025-02-12T09:14:05+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Demonstrate the effect of surface area on the rate of a reaction

Materials: magnesium ribbon, magnesium powder, marble chips (another form of calcium carbonate), powdered calcium carbonate, 250cm³ beakers, dilute hydrochloric acid, spatula, splint

Method a

Into two beakers pour an equal volume of dilute hydrochloric acid about 20cm³
Add a small spatula load […]

Comments Off

Extraction of copper from oxides
Gallery
Extraction of copper from oxides

Notes, O Level Science Notes, Ordinary Level Notes

Extraction of copper from oxides

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

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

In addition to sulphides
Copper ore can also be in the form of oxides
For example Cuprite
Unlike withe sulphides the oxygen in copper oxides cannot be driven off by roasting
Copper can be yielded by using the reduction process
Sodium carbonate is used in the process
It […]

Comments Off

Uses of sulphuric acid
Gallery
Uses of sulphuric acid

Notes, O Level Science Notes, Ordinary Level Notes

Uses of sulphuric acid

By garikaib|2025-02-12T09:43:37+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Uses of sulphuric acid

Most of the sulphuric acid produced at Zimphos is used to
make fertilizers (mostly superphoshate)
Some of the sulphiric acid is used to manufacture aluminum sulphate
Which in turn is used as a flocculent in water purification processes
Bauxite from Mutare is dissolved into sulphuric acid
The word […]

Comments Off

Experiment: Demonstrating that carbon dioxide extinguishes a burning flame

By garikaib|2025-02-12T09:10:46+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Carbon dioxide extinguishes flames ZIMSEC O Level Combined Science Notes: Experiment: Demonstrating that carbon dioxide extinguishes a burning flame

Aim: to show that carbon dioxide extinguishes a flame

Materials: 3 different sized candles, vinegar, baking soda, beaker or plastic bottle, shallow dish

Method

Place the 3 pieces of candle in a […]

Comments Off

Experiment: Current and Voltage
Gallery
Experiment: Current and Voltage

Notes, O Level Science Notes, Ordinary Level Notes

Experiment: Current and Voltage

By garikaib|2025-02-12T09:24:45+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Current and Voltage

Aim: To show how current changes with voltage and to find the resistance of a resistor

Materials: Three/Four 1.5V battery cells, ammeter, lamp,resistor, switch, leads with crocodile clips

Method

Current and Voltage

Set up the series using one cell as shown in the […]

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