Q19 of 252 Page 56

What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur?

Some element have intermediate properties of the metals and non-metals. The elements which exhibit the properties of metals as well as non-metals, are called metalloids. Example: Boron, Silicon, Germanium etc.


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17

Name one element, one compound and one mixture.

 18

What is the major difference between a solution and an ordinary mixture?

 20

Fill in the following blanks with suitable words:

(a) An element is made up of only one kind of ………….


(b) Brine is a ………… whereas alcohol is a ………….


(c) Brass is an alloy which is considered a ………….


(d) The three important metalloids are ………….


(e) The elements which are sonorous are called ………….

 21

Classify the following into elements and compounds:

(i) H2O (ii) He (iii) Cl2 (iv) CO (v) Co