5 tips for understanding & committing to memory Chemistry reactions...

---

There are various terms in chemistry like the types of Chemical Reaction, Chemical Equation, and Balancing, Types of Chemical Reactions, Redox Reaction- Rancidity and Corrosion.

We have often seen that some substances when mixed, form new substances. Like if we want to make tea, we add sugar, tea, milk, and water. On heating, it turns into tea. Likewise, if you add a spoon of curd to lukewarm milk and keep it aside for a few hours, then the whole milk turns into curd. We conclude that they thoroughly mix and form a new substance. This thorough mixing is a chemical reaction.

Chemical Reaction means that when two or more substances react and form some new substance, then it is called a chemical reaction.

Let glance into the reactions related to chemical reaction:

• Burning of magnesium ribbon: The magnesium ribbon contains a layer of carbonate on it so before burning it needs to be cleaned properly with sandpaper.

Products: magnesium oxide (white color_MgO)

Identification property of reaction: white dazzling flame

• Reacting zinc granules with dilute sulphuric acid
• Chemical reaction: H2So4+Zn— ZnSo4+H2
• Products: zinc-sulfate and hydrogen gas

Identification: The beaker becomes hot and hydrogen gas is produced which makes match stick burn with a pale blue flame and popping sound.

• Reacting barium iodide with lead chloride
• Chemical reaction : BaI+PbCl2→BaCL2+Pb
• Products: barium chloride white color and yellow color precipitate of lead iodide.

Characteristics of a chemical reaction

• It is either accompanied by a change in color.
• Heat energy gets produced or absorbed.
• Precipitation forms.
• Gas released.

Chemical Equation and Balancing

Chemical equation is the representation of chemical reaction through symbols, molecular formulas, moles, states, etc.

In the general sense, everyone knows that all chemical reaction obeys the law of chemical combination. Therefore, chemical reactions need to be balanced. It is done by hit and trial method.

Types of chemical reactions

We come across different types of reactions that occur in nature. Let us study about their type in detail :

1. A combination reaction is when two or more reactants react to form a single product.

This reaction can be between element – element, element – compound or compound – compound.

When magnesium ribbon is burned, then it is an activity of combination reaction

Burning of magnesium ribbon: the magnesium ribbon we bring has a layer of carbonate on it so before burning it needs to be cleaned thoroughly with sandpaper.

Identification property of reaction: white dazzling flame

1. Decomposition reaction is the type of reaction in which a reactant breaks up into its constituents either through heating or passing current or in the presence of light.
2. Displacement reaction is a reaction between element and a compound in which more reactive elements displaces less reactive from its compound

Redox –reaction means the reaction in which oxidation and reduction both occur simultaneously.

Read More About Exams & Education Here

Attempt Questions Here