2016年5月30日 · 1.burning of paper. 2.cooking of food 3.burning of wood 4.ripening of fruits 5.rotting of fruits. 6.frying egg 7.rusting of iron

2020年3月27日 · Chemical changes result in the formation of new substances when the composition of the original substance is changed; for example, when a metal reacts with the oxygen of the air it forms a new substance called an oxide . Essential oils can also react with oxygen, which alters their chemical composition and properties.

2019年4月2日 · For example, H2 + Cl2 -----> 2HCl. Now, change of state refers to the process of conversion of one state of matter to another state of matter. In many chemical reactions, a change of state is observed. The reaction might start with gaseous or liquid reactants but it will end up with a solid product and vice-versa.

2023年9月11日 · · Chemical change is the burning of gas with the evolution of CO2. (2) Digestion of food is another example where both physical and chemical changes occur simultaneously. · Physical change is the breakdown of larger food molecules into simpler ones. · The chemical change is the digestion of food by the action of HCl and enzymes

2018年7月10日 · Physical change : 1}crushing a can 2}melting an ice cube 3}boiling water 4}mixing sand and water 5}breaking a glass 6}dissolving sugar and water 7}chopping an apple 8}chopping wood 9}mixing red and green marbles 10}sublimation of dry ice chemical change : 1}rusting of iron 2}combustion (burning) of wood 3}metabolism of food in the body

2020年5月18日 · d) Changing of water to water vapour is not an example of chemical change. Explanation: A chemical reaction is a reaction in which two or more substances react and make two or more new substances. In the given question: a) Digestion of food in our body is a chemical reaction because there are acids in our stomach that react with our food.

2017年12月28日 · A chemical change may not always be visible to human eye but at times, it so happens that the colour of chemicals changes after undergoing a chemical change. When two or more substances combine to react, they produce a different structure, which has a total different composition and color. Example: Reaction of iron and copper sulphate

Give 5 examples of change in colour during chemical reaction with chemical equation..?? - 3179070

2020年4月26日 · When baking soda is mixed with vinegar, a chemical reaction takes place which causes bubbles. Thus, it is a chemical change. While baking a cake, the raw materials are mixed and then placed in an oven. When heat is supplied, the materials will lose their initial characteristics and hence it is also an example of chemical change. Some Indicators ...

2017年8月28日 · The curdling of milk is a chemical change. The type of change which leads to the formation of new product with different properties and the obtained product cannot be reversed again to the reactant is called as chemical change. When milk is curdled, the liquid form of milk gets converted into solid and leads to the formation of curd.