In the acid-base reaction between Sr(OH)2 and HNO3, 0.75 L of 0.85 M Sr(NO3)2 is
formed upon the reaction of 0.515 L of HNO3
solution and excess Sr(OH)2. What is the
molarity of the initial HNO3 solution?
1. 2.48 M
2. 0.619 M
3. 1.55 M
4. 0.233 M
5. 4.11 M
6. 0.638 M
7. 1.24 M

Which type of bond is present in hydrogen sulfide (h2s)? the table of electronegativities is given. a. hydrogen b. ionic c. nonpolar covalent d. polar covalent

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.

Which change to the system wood cause the freely-moving piston to lower?