On the basis of composition of matter, milk is considered to be :
(a) a pure substance (b) an impure substance (c) an element (d) a compound
Write answers to the following questions.
(a) How are properties of substances determined?
(b) Explain the differences between compounds and mixtures.
(c) Why is an alloy a mixture?
(d) Why are substances classified?
WHY IS AIR CONSIDERED TO BE A MIXTURE WHERAS SALT AS A PURE SUBSTANCE?