It takes more time to heat 100 liters of water than 10 liters of water because . the molecules are closer together in 100 liters than in 10 liters
the boiling point increases with an increase in volume
the boiling point decreases with a decrease in volume
there are more molecules to heat in 100 liters than in 10 liters

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements