Avagodro s number
Avogadros Law says that equal volumes of all gases contain the same number of molecules. The number of molecules in 1 mole of a gas is 6.02 x 10^23. This is called: Avogadros number.
All non-zero digits are significant.
Zeros between digits are significant.
Zeros at END of a COUNTED quantity are NOT significant.
Zeros in front of a number are not significant.
1603 (4 significant figures)
Mendeleev invented the periodic table while writing a chemistry textbook. Henry Mosely later improved the periodic table by putting the elements in order according to increasing number of protons. It is still in this order today.
4.3 x 10^3
Adding and Substracting in Scientific Notation REQUIRES the exponents to be the SAME. EASIEST way to do this problem:
Change into regular numbers and then put your answer in proper scientific format:
(3.0 x 10^2) + (4.0 x 10^3) = 300 + 4,000 = 4,300 =
4.3 x 10^3
10.4 (3 significant figures)
Addition/Subtraction: answer must have the same number of decimal places as the measurement with the least number of decimal places.
In this case 5.1 has ONE decimal place.
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