Based on the trend in valence electrons across periods for main-group elements, how many valence electrons does nitrogen (N) have?
A. 2.
B. 5
C. 1
O O
D. 6

Acylinder is filled with 2.00 moles of nitrogen, 3.00 moles of argon and 5.00 moles of helium. if the gas mixture is at stp, what is the partial pressure of the argon

Consider this initial-rate data at a certain temperature for the reaction described by

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.