Gasoline is a mixture composed primarily of hydrocarbons such as isooctane, which is also known as 2,2,4-trimethylpentane.
gasoline is assigned a number called an octane rating. gasoline with an octane rating of 87 performs the same as a mixture that consists of 87% isooctane and 13% heptane.
an alternative fuel, e-85, can be used in some automobiles. this fuel is a mixture of 85% ethanol and 15% gasoline.

state the octane rating of a gasoline sample that performs the same as a mixture consisting of 92% isooctane and 8% heptane.
identify the functional group in a molecule of ethanol in the alternative fuel e-85.

maybe the spark is gone, love is a weird emotion and there is a possibility he may have found somebody else.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance