Chemistry, 18.09.2019 05:00 jngonzo1226
Amixture of oxygen and hydrogen is analyzed by passing it over hot copper oxide and through a drying tube. hydrogen reduces the cuo to metallic cu. oxygen then reoxidizes the copper back to cuo. we know that 100 cm3 of the mixture measured at 25o c and 750 mm yields 84.5 cm3 of dry oxygen measured at at 25o c and 750mm after passage over cuo and the drying agent. what is the original composition of the mixture? (hint: first write balanced chemical equation for the reactions.)
Answers: 3
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1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false
Answers: 3
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Answers: 1
Chemistry, 22.06.2019 22:00, huddyxo
Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.
Answers: 1
Chemistry, 23.06.2019 06:30, lwattsstudent
When microscope slides are stained to show blood cells, the small red blood cells that appear on the slides are much numerous than the large white blood cells. this supports the concept that
Answers: 1
Amixture of oxygen and hydrogen is analyzed by passing it over hot copper oxide and through a drying...
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