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CHEMISTRY FORM 1


i Common Chemistry Laboratory Chemicals
ii Common Chemistry Laboratory Apparatus
iii Safety in the Chemistry Laboratory
iv Why we should learn Chemistry
1. INTRODUCTION TO CHEMISTRY
2. SIMPLE CLASSIFICATION OF SUBSTANCES AND SEPERATION OF MIXTURES
3. ACIDS, BASES AND INDICATORS
4. AIR AND COMBUSTION
5. WATER AND HYDROGEN
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Introduction to Chemistry: What matter consists of

1.0 Introduction to Chemistry


1.3 What does matter consist of?


To find out what matter consists of


Materials and substances required

  1. Potassium manganate (VII) or copper (II) sulphate crystals
  2. Clean water, beakers, spatula, and stirrer or glass rod

Open the video below, dilution of potassium manganate (VII) solution (courtesy ‐ Youtube Potassium permanganate and dilution | Molecular structure | Chemistry by KClassScienceChannel) and carefully observe what happens.



Questions 1.3


From the observations,


  1. What happens to the whole volume of water in the beaker when a small amount of potassium manganate (VII), an example of solids, is added?
  2. What must have happened to potassium manganate (VII) to cause the change observed?
  3. When more and more water is added (dilution), the purple colour slowly fades towards colourlessness. What does this tell us about the final size and spread of potassium manganate (VII) particles?
  4. What do potassium manganate (VII) and other solids consist of?
  5. From your experience, what happens when water (a liquid) is heated for a long time in an open container such as a sufuria or beaker?
  6. Air exists and we can feel it. Why is it that we cannot see air?
  7. In conclusion, matter consists of --- called --- (Check in your Chemistry course book or Internet).
  8. State other observations in real life that also support the conclusion in 7.

Answers to Questions 1.3


At home and around us

We can detect the taste of salt in food, sugar in tea, the aromatic smell of food and fruits, and the scent of a perfume. But we cannot see the substances responsible for them. Liquid air freshener comes out as a fine spray that disappears into invisible matter. These are further indications that matter consists of tiny invisible particles.

The invisible enemies

Deadly viruses such as HIV virus, coronavirus, ebola virus, and very many other disease-causing organisms exist as invisible particles. So they can enter our bodies without our knowledge. To protect ourselves, we should follow health guidelines given by the government and World Health Organization.

Coronavirus

By The Guardian