the table below shows some physical properties of two unknown samples.
physical properties
sample mass boiling point
x 100 g 56 °c
y 290 56 °c
what would best support whether the two samples are of the same substance or not?
the two substances are the same because their extensive property is different.
the two substances are not the same because their extensive property is the same.
the two substances are the same because their intensive property is the same.
the two substances are not the same because their intensive property is different.

 The two substances are the same because their intensive property is the same.

Explanation: the answer is The two substances are the same because their intensive property is the same.

this is the correct answer because the boiling point is a is a bulk property this mean that is a property of substance or sample which does not change as the amount of substance or sample changes.

also we have to keep in mind that the boiling point is is a physical property that is not dependent on the size or mass of a sample.

so we can conclude that you can change the mass, the volume of this sample or this substance the boiling point always will be the same.

Option (c) is the correct answer.

Explanation:

Properties which do not depend on the amount of matter are known as intensive properties.

For example, boiling point, melting point, reactivity with an acid etc.  

On the other hand, properties which depend on the amount of matter are called extensive properties.

For example, volume, length, mass etc.

Intensive properties are helpful in determining whether two or more substances are similar in nature because these type of characteristics does not depend upon change in conditions or amount.

Hence, when the two given substances have same boiling point then it means they have same intensive property. And, only a substance of similar type can have same boiling point.

Thus, we can conclude that the statement the two substances are the same because their intensive property is the same.

the answer is true. hope it .