1. Solve the following problems and record answers in proper significant figures. a. 9.00/0.15- b. 45.62-7.8= c. 8.50 mL- = nl. d. -40.0 F= K 2. A sugar water mixture contains 23.5g of sugar and 221.6g water. What is the percent by mass of sugar in the solution? 3. (a) A neutral atom has a mass number of 56 and has 30 neutrons. Write its complete nuclear symbol. (b) This atom has lost three electrons. What is its formula as an ion and name the ion? 4. Write the Lewis electron dot symbol for the sulfur atom, for the sulfide ion, and show the complete spdf electron arrangement for the sulfide ion. 5. Write the formula and name the compound formed when the ion of 3(b) and sulfide ion react. 6. Given the formula NCl, write (a) electron dot structure, (b) indicate its geometry and name the geometry, (e) is it polar or nonpolar, why? (d) name the compound. 7. (a) Write the formula for 1 Calcium Phosphate 2. Copper (1) Nitrate (b) Write the name for 1.NH,CH 2. FeSO4