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1.     If 225 mL of water at 25.0 ℃ as the temperature lower to 0.00

℃ and the water freezes, what volume of ice is created density of water at 25.0 ℃ is 0.997 g/ ML and the density of eyes at 0.00 ℃ is 0.917g/mL.
2.     What is the name of for Na2SO3+6H2O?
3.     What is the correct formula for Magnesium Nitrite?
4.     What is the mass percentage of oxygen in Ca (NO3)2?
5.      What is the correct formula for Phosphoric acid?
6.     What is the molar of Ca3 (PO4)2
7.     How many cm2 are in 0.355 ft2? (2.54cm=1.00 inch, 12 inches = 1foot)
8.     The mass number is equal to
9.     A compound has a formula that is N2X3 where X is an unknown element. If the compound has a molar mass of 124.20, what is the identity of X?
10. Which of the following is chemical property of iron?
11. Is Ca3 (PO4)2 an ionic or covalent compound?
12. What element does X represent in 17X if it has 9 neutrons?
13. Which of the following is a possible molecular formula for a compound that has CHO2 as the empirical formula?
14. A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1,79 g/ml, 1,81 g/mL, 1.80 g/mL, and 1.81 gml. If the actual value for the density of the sugar solution is 1.8g/mL, which statement below best describes her results?
15. Which, if any, of the following would not typically have a -3 charge in an ionic compound?
16. Which of the following does not form a diatomic molecular element?
17. Which, if any, of the following is true for ionic compound?
18. A compound has an empirical formula of PO2 and a molar mass of 314.85; which of the following is the compound?
19. How many grams of oxygen are in 55.8g of N2O5?
20. Is CH4 an ionic or covalent compound
21. An ionic bound is best described as
22. How many protons, neutrons, and electrons in 60Co2+?
23. What is the mass in kg of 6.89X10 25 molecules of CO2? 
24. What is the correct formula for phosphorus pentabromide?
25. Which of the following is true for 16O2-, 17O2- and 18O2-?
26.    What is the chemical name for Ni(OH)2?               

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