Agas barbecue burns propane gas to generate heat. propane gas becomes carbon dioxide gas and water vapor as it burns. oxygen from the air is a reactant in this process. this is an example of a chemical reaction.
why is burning propane gas a chemical reaction?

the atoms that make up propane and oxygen change into different atoms after the reaction.

the water vapor that forms after the reaction is in the gas phase.

the atoms in propane and oxygen rearrange to form other substances after the reaction.

oxygen is involved. any process involving oxygen is a chemical reaction.

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

Which liquid (h2o, h2o + soap, or h2o + salt) has the strongest cohesion and adhesion? (need now plz)

Titration reveals that 11.6 ml of 3.0m sulfuric acid are required to neutralize the sodium hydroxide in 25.00ml of naoh solution. what is the molarity of the naoh solution?