Final answer:
The statement 'Water heats faster if it contains salt' is a hypothesis because it is a testable explanation. An experiment comparing the heating of saltwater and freshwater could determine its validity.
Step-by-step explanation:
The statement that qualifies as a hypothesis is: 'Water heats faster if it contains salt.' This qualifies as a hypothesis because it is a suggested explanation that can be tested experimentally to see if it holds true. To determine whether this hypothesis is correct, one could conduct an experiment where two samples of water, one with salt and one without, are heated under identical conditions to see which one reaches a certain temperature faster.