Two different substances can not have similar physical properties
true or false​

The answer is True

Explanation:

Other properties, such as density, can be used to identify substances. They do not vary from one sample of the same substance to another. ... However, it is possible for two different substances to have the same density.

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True

Explanation:

this is true because if they are two different substances then they cannot have the same property because they are made up of different substances and properties.

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c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

it means there are 3 atoms of oxygen