Everything Science Grade 10

2.5 CHAPTER 2. CLASSIFICATION OF MATTER

Activity: Group Work : Looking at metals

1. Collect a number of metal items

from your home or school. Some

examples are listed below:

• hair clips


• safety pins


• cooking pots


• jewellery


• scissors


• cutlery (knives, forks, spoons)

2. In groups of 3-4, combine your col-
   lection of metal objects.


3. What is the function of each of
   these objects?


4. Discuss why you think metal was
   used to make each object. You
   should consider the properties of
   metals when you answer this ques-
   tion.

Non-metals ESAAF

In contrast to metals, non-metals are poor
thermal conductors, good electrical insula-
tors (meaning that they donotconduct elec-
trical charge) and are neither malleable nor
ductile. The non-metals include elements
such as sulphur (S), phosphorus (P), nitrogen
(N) and oxygen (O).

Sulphur

Picture by nickstone333 on Flickr.com

Metalloids ESAAG

Metalloids or semi-metals have mostly non-metallic properties. One of their distinguishing
characteristics is that their conductivity increases as their temperature increases.

44 Chemistry: Matter and Materials