I am in year 10 and we are restarting chemistry again. last year, I have found chemistry kind of challenging, so what tips could you guys give me to succeed this year?

take help from your teacher surf internet if you find problem.

Make clear notes and develop healthy study habits

Explanation:

Chemistry can be hard but if you can write down what is important and make a healthy study environment then you'll feel more comfortable with the material. I also recommend getting an advanced labeled periodic table. It came really handy for me during my time in Chemistry. Another tip, don't sweat what you can't get right. It is okay to not understand, so don't put too much pressure on yourself. Sending much love and lucky to you

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.