Additional information: On heating, candle wax melts and forms liquid wax. So, it is a physical change in the burning of candles. Since, it again turns into solid wax on cooling. This is a reversible change.

Yes, in some cases the physical and the chemical changes can occur together. One such example is the burning of candle. The wax present in the candle changes to liquid state. At the same time, the constituents carbon and hydrogen present in wax react with oxygen of air to form new subtances.

Physical Changes: On heating, candle wax gets melted. Since it again turns into solid wax on cooling. 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.

We will know that caramelizing sugar is a chemical change because it changes the sugar’s color. A chemical change involves the forming of new substances from specific substances called reactants. Caramelizing sugar releases volatile chemicals that cause its caramel flavor.

Different chemicals are present before (sugar) and after (caramel) the cooking process. Therefore, this is a chemical change. The irreversible nature of caramelization is also an indicator that this transformation is a chemical change.

Dissolving sugar in water is an example of a physical change. Here’s why: A chemical change produces new chemical products. In order for sugar in water to be a chemical change, something new would need to result. However, mixing sugar and water simply produces…

Sugar cubes dissolve in hot coffee. Both are chemical changes because there is a change in the composition of ice and sugar. Both are physical changes because there is a change in the physical states of ice and sugar.

The tarnish is actually the result of a chemical reaction between the silver and sulfur-containing substances in the air. The silver is actually combining with sulfur and forming silver sulfide. When a thin coating of silver sulfide forms on the surface of silver, it darkens the silver. That’s what we call ‘tarnish.