Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> What is meant by pure substance and mixture?

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Pure substances are defined as substances that are made of only one type of particles i.e they have constant composition and properties throughout. Examples: Iron and gold
A mixture consists of two or more substances which are not combined chemically. Examples: sand and salt, flour and husk.