Blue litmus paper
when sodium comes in contact with water,it results in an exothermic reaction to give sodium hydroxide.
What procedure to follow if exposed skin comes in contact with any chemical substance
physical change
black is not a colour...... the thins which we can't see comes as black
When blue and yellow are combined, you get the color green.
changes color
It changes colour.
It changes color.
it changes color
It changes color
It changes color
It changes color.
Because it call sense the difference between a base and an acid.
blue color
it changes color
it changes color
It changes color.