HELP ASAP, I WILL BE GIVING 15 POINTS TO WHOEVER CAN GET THIS. Part C: Calculate the number of atoms of each element that are present in the following simple binary ionic compounds. 1. Znl2 _ 11. CaO _

2. MgBr2 _ 12. KF _

3. Na3N _ 13. Li3P _

4. BaO _ 14. SrS _

5. Na4Si _ 15. ZnCI2 _

6. Zn3N2 _ 16. K2O _

7. Al2O3 _ 17. KCI _

8. KBR _ 18. Nal _

9. RuN _ 19. La2O3 _

10. HfO2 _ 20. Cs2S _

1. calculate the approximate enthalpy of the reaction in joules. estimate that 1.0 ml of vinegar has the same thermal mass as 1.0 ml of water. iqnore the thermal mass of th sodium bicarbonate. note: it takes about 4.2 joules () to change 1.0 gram (1.0ml) of water 1.0 c

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

Asolid that forms and separates from a liquid mixture is called