Answer: An element is a pure substance. It can not easily be broken down into parts by physical means.
A)True
B)False
<u>The answer is true. </u>
Answer:
Number molecules present = 4.92 multipled by avogadro's number.
Aphelion in miles =94290301
Perihelion in miles = 91200281
Explanation:
To convert km in mile we use the multiply the distance in km with 0.62, because there are 0.62 miles in 1 km.
Aphelion in miles = aphelion in km × 0.62
Aphelion in miles = 152081132 × 0.62
Aphelion in miles =94290301
Perihelion in miles = perihelion in km × 0.62
Perihelion in miles = 147097229 × 0.62
Perihelion in miles = 91200281
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conversion of units
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Physical! Because they do not modify the nature of the substance ( if you look at the chemical level) and it is reversible
Vapor is H20
Water is H20
Ice is H20
A chemical changes is not reversible
Burning wood for example! And the reactants interact together to form a new product.