LOTS OF POINTS Which statement about Fe is supported by the modern atomic theory but no John Dalton’s theory? Look at the pic provided for choices.

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

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.