I NEED HELP PLZ I HATE CHEMISTRY AND I NEED YOUR HELP WITH THESE TWO QUESTIONS Q1) If we randomly sampled *200* Boron isotopes from nature, how many would be Boron-11?
A. 160
B. 40
C. 22
D. 300
E. 120
Q2) If we randomly sampled *200* Boron isotopes from nature, how many would be Boron-10?
A. 120
B. 160
C. 200
D. 22
E. 40

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.

Complete each row of the table below by filling in the missing prefix or missing exponent.

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.