What is the difference between physical and chemical change give examples?

Answer 1

CHEMICAL CHANGE: Such change is a permanent change and substances go through such changes not only alter their outer shape but also change their composition. For example: conversion of milk into yoghurt is a chemical change PHYSICAL CHANGE: Such change is a temporary change and substances go through such changes alter their shape and volume only but composition remains same. For example: water changes into ice and ice melt to water is a physical change.

Answer 2

a chemical change changes the make-up of the actual substance

a physical change only changes the appearance

Chem change- Burning wood, reacting to solutions

Phys change- cutting grass, boiling water

Chemical changes are usually hard to reverse

Answer 3

A physical change is when you change the outward appearance of something like cutting a piece of paper in two while a chemical change changes the chemical composition of something like baking bread. Or, from a straight chemistry viewpoint: Dissolve some salt in water. That's a physical change. The salt is dissolved (a physical change) but it is still salt. Now mix a little bit of salt with the juice of a half a lemon. You have created weak hydrochloric acid - a chemical change between the NaCl and the acetic acid.

Answer 4

Physical changes are changes that can be reversed. Chemical changes are changes that cannot me reversed. Two or more new substances are formed in chemical changes. Examples of physical changes: 1.Stretching of rubberband. 2.Folding of paper. Examples of chemical changes: 1.Burning of paper. 2.Turning of milk into curd.

Answer 5

Chemical change: a process in which the chemical composition of the initial compounds (reactants) is modified.

Examples: all chemical reactions are chemical changes (burning, reduction, polymerization, alkylation, etc.).

Physical change: in these processes the chemical composition is not changed.

Examples: melting, boiling, sublimation, evaporation, etc.