Always point the open end of a test tube being heated d. Away from all people.
When heating a substance in a lab, there is a chance that the substance could react to the heat and evaporate into a gaseous state.
This could be very dangerous if the gas is:
- corrosive
- a pollutant
- biological breathing hazard
You should therefore be careful to point the tube away from others and yourself so that the gas does not affect either them or you.
In conclusion therefore, always point the open end of the tube away from all people.
Find out more precautions at https://brainly.com/question/2792204
