Which of the following statement is false?Physical changes are always reversible and it is temporary.During physical change only the physical properties such as state, colour, shape etc undergo a change.Chemical changes are not always irreversible.In a chemical change one or more new substances are formed.None of the above.

Give two examples for each of the following cases:(a) Physical changes which are reversible. [1 mark](b) Physical changes which are not reversible. [1 mark](c) Chemical changes. [1 mark]

During a chemical change, which will not happen?(A) New substance formed (B) Energy changes are involved(C) It is a permanent change (D) Only state of the substance is changed

During a chemical reaction new substances are formed from old ones. Which of the following is NOT ALWAYS true?     [1]ANew substances can be changed back to the original onesBThere is often a colour changeCThere is often a temperature change

45. If there is no change in composition during a physical change, then there is no change in the appearance of the substance. Is this statement TRUE or FALSE. Justify?1 pointTrue, because physical change means no change in composition and appearanceFalse, because physical change means no change in composition but the appearance does change. For example, crushing can or boiling water are physical processes but they do change the physical appearance of the original substance (although the chemical composition or identity does not change)

Which of the following is not a physical change?