February 2025

Introduction to the Trading and Profit and Loss Account

By |2025-02-12T09:16:08+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

Image credit pixabay.com Image credit pixabay.com ZIMSEC O Level Principles of Accounts Notes: Introduction to the Trading and Profit and Loss Account

  • The profit/loss of a business is calculated by preparing a trading and profit and loss account
  • It is sometimes called only the profit and loss account in error
  • It is also […]
Read More
Comments Off on Introduction to the Trading and Profit and Loss Account

Trading and profit and loss accounts and balance sheets: Other items

By |2025-02-12T09:39:14+02:00February 12th, 2025|Notes, Ordinary Level Notes, Principles of Accounts Notes|

Trading and Profit and Loss Accounts. Image credit caonline.com.au Trading and Profit and Loss Accounts. Image credit caonline.com.au ZIMSEC O Level Principles of Accounts Notes: Sole Trader: Trading and profit and loss accounts and balance sheets: Other items

Read More
Comments Off on Trading and profit and loss accounts and balance sheets: Other items

Loading a beam

By |2025-02-12T09:12:52+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Loading a beam Loading a beam ZIMSEC O Level Combined Science Notes: Loading a beam

  • When a beam is loaded it will bend
  • Bending movement creates stress
  • The top of the beam is compressed and the underside is stretched
  • This is because there are compressive forces at the top and stretching/tensile forces at the underside
  • If […]
Read More
Comments Off on Loading a beam

Experiment: Reducing Iron oxide using aluminium

By |2025-02-12T08:56:02+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Reducing Iron oxide using aluminium

Aim: To remove oxygen from iron oxide using aluminum

Materials: sand, tin can, safety screen, magnesium ribbon and magnesium powder, wooden splint, aluminum powder, dry iron oxide, barium preoxide

Reducing iron oxide using aluminum oxide Reducing iron oxide using aluminum oxide

Method

  1. Fill the tin […]
Read More
Comments Off on Experiment: Reducing Iron oxide using aluminium

Experiment: Investigating the effects of concentration on marble chips

By |2025-02-12T09:15:36+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Concentration varies directly with the rate of reaction Concentration varies directly with the rate of reaction ZIMSEC O Level Combined Science Notes: Experiment: Investigating the effects of concentration on marble chips

Aim: To investigate the effect of concentration on the reaction between marble chips and hydrochloric acid

Materials : conical flask/glass jam jars, measuring cylinder, […]

Read More
Comments Off on Experiment: Investigating the effects of concentration on marble chips

Experiment: Separating copper from its oxides

By |2025-02-12T09:30:43+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Experiment: Separating copper from its oxides

Aim: To separate copper from its oxide ores

Materials: copper oxide, iron nail, dilute sulphuric acid, filter funnel, 2 beakers, stirring rod, filter paper, burner

Extracting copper from copper oxide Extracting copper from copper oxide

Method

  1. Place a small amount of copper oxide in a […]
Read More
Comments Off on Experiment: Separating copper from its oxides

The Manufacture of sulphuric acid

By |2025-02-12T08:56:03+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: The production of sulphuric acid

  • Sulphuric acid is produced using the Contact process
  • In Zimbabwe there is a sulphuric acid production plant at Zimphos in Harare
  • Sulpher or iron pyrites (iron sulphide) is roasted to form sulphur dioxide
  • The word equation for roasting iron pyrites is:
  • \text{iron sulphide+oxygen}\rightarrow\text{iron oxide+sulpher dioxide}
  • The word […]
Read More
Comments Off on The Manufacture of sulphuric acid

Experiment:investigating fuel efficiency

By |2025-02-12T09:11:59+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Testing fuel to determine its energy content Testing fuel to determine its energy content ZIMSEC O Level Combined Science Notes: Experiment:investigating fuel efficiency

Aim: To determine the amount of heat liberated when different liquid fuels burn

Materials:  2 spirit burners, wooden block, clamp and stand, meths, paraffin, thermometer, draught shields, clamp, beaker, water, tripod […]

Read More
Comments Off on Experiment:investigating fuel efficiency
Toggle Sliding Bar Area
Go to Top