Question

which of the followin are chemical changes? check all that apply: gasoline is evaporated, water is frozen, water is boiled, water is heated up, gasoline is burned

Answer 1

gasoline is burned and gasoline is evaporated..

Answer 2

to determine whether something has gone through a chemical change you have to identify the following:
1)a new substance is formed
2)there is a change in the chemical properties of the substance undergoing whatever change
3)hard to reverse
on the other hand physical changes
1) are easy to reverse with simple separation techniques
2) no new substance is formed
3) there is no change in chemical properties

i believe the answer is gasoline being burnt since whenever you burn gas or fossil fuel CO2 is usually given off

Answer 3

A chemical change is permanent. So which of your option yields a permanent change? Gas burning is certainly irreversible. Gasoline being evaporated can technically be reversed because no new chemical reactions are taking place to change its chemical structure. Ice that melts can be refrozen and gas can re-condense to water.

Answer 4

Evaporation is a physical change. No chemical reaction takes place, in general. There are arguable exceptions, such as when a molten salt evaporates.