How to tell a physical property and a chemical property? Someone help please I do not understand the differences and how to tell them apart

Determine the mass of fuel required for the expected energy consumption in the united states for the next ten years. energy use per person per year in the united states = 3.5 x 1011joules base calculations on current population of 310,000,000.

What’s the percent by mass of carbon in c10h14n2

Given that 1 mi = 1760 yd, determine what conver- sion factor is appropriate to convert 1849 yd to miles; to convert 2.781 mi to yards.