August 2016

Experiment: Testing tooth cleaning agent

By |2022-09-15T12:38:05+02:00August 3rd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Colgate toothpaste

Colgate toothpaste ZIMSEC O Level Combined Science Notes: Experiment: Testing tooth cleaning agent

Aim: To test the properties of teeth cleaning agents

Materials: various brands of toothpaste, pH paper, microscopes, slat, bicarbonate of soda, lid bottles/suitable containers for the toothpaste

Method

  1. Examine toothpaste under a microscope to compare the particle size of the various […]

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Teeth and tooth decay

By |2022-09-15T12:38:05+02:00August 3rd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Good dental care is part of human health. Image credit claimfame.com

Good dental care is part of human health. Image credit claimfame.com ZIMSEC O Level Combined Science Notes: Teeth and tooth decay
  • While people enjoy food of all varieties
  • Some types of food
  • For example sweets, chocolates, carbonated drinks, cakes and […]

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People and Energy

By |2022-09-15T12:38:06+02:00August 3rd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Construction workers require a lot of energy. Image credit nehandaradio.com

Construction workers require a lot of energy. Image credit nehandaradio.com ZIMSEC O Level Combined Science Notes: Experiment: People and Energy
  • While it is true that everyone needs energy for metabolism and daily activities
  • Different people have different food needs
  • Food requirements can […]

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Experiment: Food and Energy

By |2022-09-15T12:38:06+02:00August 3rd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Burning food to to test its energy content

Burning food to to test its energy content ZIMSEC O Level Combined Science Notes: Experiment: Food and Energy

Aim: Comparing the energy value of foods

Materials: burners, small containers/beakers to hold the water, food holders, thermometers, different types of starchy and fatty foods

Method

  1. Set up the apparatus […]

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March 2016

Deficiency Diseases

By |2022-09-15T12:39:49+02:00March 16th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Iodised salt can prevent iodine deficiency

Iodised salt can prevent iodine deficiency ZIMSEC O Level Combined Science Notes: Deficiency Diseases
  • A person might suffer from a deficiency disease if their diet lacks certain essential minerals and vitamins
  • Two essential minerals and vitamins are:
  • Iodine and
  • Vitamins

Iodine


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Science:Malnutrition

By |2022-09-15T12:39:49+02:00March 15th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Eating junk food can lead to obesity. Image credit newtimes.co.rw

Eating junk food can lead to obesity. Image credit newtimes.co.rw ZIMSEC O Level Combined Science Notes: Malnutrition
  • Malnutrition is lack of proper nutrition
  • It is a result of either not having enough to eat
  • Or not eating enough of certain nutrients that the […]

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February 2016

Carrying out Food Tests

By |2022-09-15T12:40:40+02:00February 3rd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Testing for starch. Image credit fineartamerica.com

Testing for starch. Image credit fineartamerica.com ZIMSEC O Level Combined Science Notes: Carrying out Food Tests
  • It is important to know how much nutrients they contain
  • This would be useful to nutritionist and those who are health conscious

Food Testing experiments

  • Simple tests can be made […]

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Food types and their importance

By |2022-09-15T12:40:40+02:00February 3rd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Different types of food have different functions. Image credit healthydietadvisior.com

Different types of food have different functions. Image credit healthydietadvisior.com ZIMSEC O Level Combined Science Notes: Food types and their importance
  • Carbohydrates-these are  energy-rich foods that are largely made up of starch and sugars. They are easily broken down in the […]

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Nutrition

By |2022-09-15T12:40:40+02:00February 3rd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

A balanced diet. Image credit healthandstylish.com

A balanced diet. Image credit healthandstylish.com ZIMSEC O Level Combined Science Notes: Nutrition
  • Nutrition is that branch of science that deals with nutrients and nutrition especially in humans
  • It is concerned with  ensuring that humans are eating foods that provide necessary nutrients for health and growth
  • Nutrients […]

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Health and well being

By |2022-09-15T12:40:41+02:00February 3rd, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Exercise is key to maintaining one'es health. Image credit centrictv.com

Exercise is key to maintaining one’es health. Image credit centrictv.com ZIMSEC O Level Combined Science Notes: Health and well being
  • Health is the absence of disease
  • It is a state of being physically and psychologically well.
  • A person is said to be healthy […]

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