我有D關於 Science 嘅問題5係好識,要交功課,希望有人幫到我!!!

True or False
1. The gas which makes up the highest percentage in air is oxygen.
2. Breathed air and unbreathed air have the same percentage of nitrogen.
3. Both breathed air and unbreathed air contain nitrogen, oxygen and carbon
dioxide.
4. A burning splint burns more brightly in nitrogen.
5. Carbon dioxide turns yellow hydrogencarbonate indicator red.