The chemical reaction represents the conversion of one substance to another by cleavage and formation of chemical bonds between bonding atoms. There are two possible kinds of changes; physical and chemical. Physical changes involve only change in physical state but the chemical composition of the substance remains same. For example; melting of ice, crushing of paper, cutting, tearing, shattering, grinding, and mixing of substances, evaporation of water etc. are good examples of physical changes. In chemical changes, the chemical composition of substance changes and it results the formation of new substance which show different chemical and physical properties.
For example, burning of wood or coal, photosynthesis, respiration, rusting are chemical changes. Any chemical change can be identified with change in colour, physical state, evolution of gas, formation of precipitate etc. A chemical change can be represented as a symbolic representation that is called as chemical equation.
The chemical equation of a chemical reaction involves chemical formulae of reactant and products of a reaction. Reactants must be written on the left side of a chemical equation and products are written at right of the equation. Both reactants and products are separated with an arrow which can be single headed or double headed. Arrow of chemical equation indicates the type of reaction; reversible or irreversible. We can do simple experiments of these chemical reactions in chemistry lab and even some of the experiments can be done at home also.
For example, if u boil an egg, it is solidified. It indicates a chemical change as the protein part present inside the egg get agitated. When we burn of wood, it results the formation of ash, carbon dioxide, and water.
You must have done some simple chemical reactions experiments in your chemistry laboratory. We can learn interesting science and technology facts by simple chemical experiments.
The simple chemical experiments by using baking soda (sodium bicarbonate) and vinegar (aqueous solution of acetic acid). We can create volcano with the help of these chemicals. For this experiment, we require baking soda, vinegar, a container and paper towels.
In the beginning some of the baking soda is taken into container and into that pour in some of the vinegar solution in it. Observe the change occurs by addition of these chemicals. We know that sodium bicarbonate is basic in nature and vinegar is an acidic solution.
The reaction of acid and base results the formation of salt and water. This reaction is called as neutralization reaction.
NaHCO3 + CH3COOH $\rightarrow$ CH3COONa + H2CO3
H2CO3 $\rightarrow$ CO2 + H2O
When sodium bicarbonate reacts with vinegar, carbonic acid forms with sodium acetate. Carbonic acid is unstable and quickly decomposes in carbon dioxide and water. Evolution of carbon dioxide creates all the fizzing as it escapes the solution. By using extra crafting skills we can give look of realistic looking volcano.
We can do many experiments at home also by using simple ingredients that you can get in your kitchen. These basic materials help kids to perform experiments in simple, safe and perfect manner. They enjoy these science experiments and can make cool projects with these ideas. Consider a simple chemical experiment that we can do at home.
Experiment of floating egg requires one egg, water, salt and a tall drinking glass. Remember that egg sinks in water but it shows different behaviour in salty water. In this experiment, first take a glass with half-filled water.
- Now add around 8 tablespoons of salt in it.
- Now add plain water until the glass is nearly full and stir it.
- Now lower the egg into the water and observe changes. Since salty water is denser than plain water, therefore egg will float in salty water. If we add plain water to this salty water, they will not have mixed, enabling the egg to float in the middle.
We can observe many chemical reactions in living organisms like plants and animals. Photosynthesis, respiration, germination, digestion are good examples of chemical changes. One such example of chemical reaction.
We know that seeds germinate to form plant through seedling. When we place seeds under soil and add water, after some days they sprout from soil in the presence of sunlight. Let’s do an experiment of growing plants. We require fresh seeds, soil, a container or pot, water and a place with light and heat. First fill the pot with soil and plant the seeds inside it.
Now place the pot in airy and warm where it will get good amount of sunlight. Remember we have to keep the soil moist by watering it. Observe changes in soil and note the day when seeds germinate and seedlings begin to sprout. The process of emerging a plant from seed is called as germination. Germination and seedlings require proper conditions of water, oxygen and sunlight. Lack of any one can damage seeds and seedlings. The range of temperature varies with seeds.