Give Reason:a. Boiling is a physical change. b. Burning of a candle is both Physical & Chemical change. c. Change is season is a periodic change however change in weather is not. d. Drying is a physical change however dehydration is a chemical change.
Answers
Answer:
Explanation:
a) Boiling waterBoiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water (H2O). If the bubbles were caused by the decomposition of a molecule into a gas (such as H2O →H2 and O2), then boiling would be a chemical change.
b)When a candle burns, both physical and chemical changes occur. ... So, the melting of wax and vapourisation of melted wax are physical changes. Chemical Changes : The wax near flame burns and gives new substances like carbon dioxide, carbon soot, water vapour, heat and light.
c)Change of season is a periodic change because it occurs periodically at regular intervals but change of weather is a non-periodic change because it do not occur periodically at regular intervals
d) The traditional answer is that it's a chemical change when bond-making and bond-breaking is involved. The material certainly changes appearance, and heating copper sulphate somehow releases bound water.