Answer the following in short :-
1. What is rusting?
2. What is chemical equation?
3. What is crystallization?
4. Give two examples of a compound.
5. What is the result of a chemical change?
Answers
HERE IS YOUR ANSWER.
Answer the following in short :-
1. What is rusting?
2. What is chemical equation?
3. What is crystallization?
4. Give two examples of a compound.
5. What is the result of a chemical change?
Answer 1:- The reddish brown flaky brittle coating formed on iron especially when chemically attacked by moist air and composed essentially of hydrated ferric oxide.
Answer 2:- Chemical equations are symbolic representations of chemical and physical changes. Formulas for the substances undergoing the change (reactants) on the right hand side and product obtained (products) on the left hand side.
Answer 3:- Crystallization, or crystallisation, is the process of atoms or molecules arranging into a well-defined, rigid crystal lattice in order to minimize their energetic state. The smallest entity of crystal lattice is called a unit cell, which can accept atoms or molecules to grow a macroscopic crystal.
Answer 4:- The two examples of compounds are:-
1. Water - Formula: H2O = Hydrogen2 + Oxygen.
2. Hydrogen Peroxide - Formula: H2O2 = Hydrogen2 + Oxygen2
Answer 5:- The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions. The particles of one substance are rearranged to form a new substance. The same number of particles that exist before the reaction exist after the reaction.
Answer ::
★ Answer the following in short :-
1. What is rusting ?
➞ When a iron object is exposed to moist air is surface gets covered with reddish brown powder called rust. The process of formation rust on iron is called rusting.
2. What is chemical equation ?
➞ A chemical equation is a symbol representation of an actual chemical reaction.
3. What is crystallization ?
➞ Crystallization is is a process when a liquid chemical solution gets converted to solid crystalline form.
4. Give two examples of a compound.
➞ A compound is a pure substance which is made up of two or more elements combined chemically in a fixed ratio and can be broken down into elements by only chemical methods.
For example ::-
- Carbon dioxide = Carbon + Oxygen
- Water = Hydrogen + Oxygen
5. What is the result of a chemical change ?
➞ A chemical change is a permanent change in which the original substance form new substance by having different composition and properties.
The results of a chemical change are :-
- New substances are formed.
- Permanent and irreversible change
- There is gain or loss of energy.
- The composition of the substance changes.
- Change of mass also occurs.