January 2023

The speed of reactions

By |2022-09-15T12:39:27+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Rate of reactions. Image credit about.com

Rate of reactions. Image credit about.com ZIMSEC O Level Combined Science Notes: The speed of reactions
  • Reactions happen at different speeds
  • This is because there are a number of factors that influence the speed of a reaction even between the same reagents
  • Reagents are […]

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

By |2022-09-15T12:39:26+02:00January 24th, 2023|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

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

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Experiment: Determining how concentration affects rates of reaction

By |2022-09-15T12:39:26+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

The rate of reaction increases with an increase in concentration

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: Investigating the effects of concentration on marble chips

By |2022-09-15T12:39:25+02:00January 24th, 2023|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, […]

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Experiment: The rate of reactions and temperature

By |2022-09-15T12:39:24+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Relationship between temperature and rate of reaction. Image credit bu.edu

Relationship between temperature and rate of reaction. Image credit bu.edu ZIMSEC O Level Combined Science Notes:Experiment: The rate of reactions and temperature

Aim:  To find the effect of temperature on the rate of reaction: using hydrochloric acid and sodium thiosulphate

Materials: flask, […]

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