Consider the reaction. A ( aq ) − ⇀ ↽ − 2 B ( aq ) K c = 2.75 × 10 − 6 at 500 K A(aq)↽−−⇀2B(aq)Kc=2.75×10−6 at 500 K If a 1.70 M 1.70 M sample of A A is heated to 500 K, 500 K, what is the concentration of B B at equilibrium?

Based on its chemical properties, identify the position of each chemical family on the periodic table.

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397

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.