Question

Sci
Ch 1 Matter around us
Think and respond
Q1.Oxygen is gas iron is solid. Why?
Q2.What is effect of pressure(atmospheric pressur) on melting and boiling point?
Q3 Can a liquid change into gas without heating give one example. Q5 Other than solid liquid and gas there are two other states of matter which are very uncommon. Can you name them​

Answer 1

Explanation:

1. in oxygen the molicules are not closely packed

so it is gas in iron molecules are closely packed so it is solid

3.yes it is due to evapouration when water kept open it evapourates and forms gas