Worth 2 Points Each Unless Otherwise Stated

Chemistry Midterm Review –Quiz grade

Worth 2 points each unless otherwise stated

1. What is the Law of definite composition and the Law of Conservation of mass?

2. (1 point) How many trials are needed to make a test reliable?

3. What is the difference between accurate and precision?

4. Convert 0.0172kg to g

5. Determine the number of atoms in 4 moles of Al.

6. State the types (and describe each) of physical separation technique for compounds.

7. What is the difference between physical and chemical change (give an example of each)?

8. Determine the number of grams of 0.500 moles of U.

-3 9. Calculate the number of moles of 5.00 x 10 g of Au.

10. (1 point) What is an isotope?

35 37 11. (6 points)Determine the number of P,E, and N of Isotopes Cl and Cl

12. Diamonds and other gemstones are measured in carats. The accepted value for the weight of a carat is 0.2 grams. A jeweler measured the weight of a carat of opals to be 0.192 grams. What is the percent error?

13 14 13. Calculate the Atomic mass units for C at 25% and C at 75%.

14. What is an allotrope and give an example?

15. What is a diatomic molecule? And give to examples

16. Using Significant Figure Multiplication rules answer the following: 7.5m x 32.5m

17. (3 points)Determine the number of Significant Digits and Scientific Notation of the following: 1.3406, 0.0976, and 10009600

18. What is the density of an object with a mass of 20g and a volume of 4.2mL?

19. Determine the half-life of a radioisotope that has a half-life of 4 days. How much of a 20 gram sample of this isotope will remain after 8 days.

1 20. (4 points)Determine the Bohr atomic Model and the long and short electron configuration of Si and Ar.

21. (3 points)What is the difference between an element, compound, and mixture (Give an example of each too)?

22. (3 points) What is the difference between a metal, metalloid, and nonmetal (Give an example of each)

23. Name the groups and write down the elements found in the following groups: 1, 2, 17, 18

24. (1 point each) What can you conclude from Rutherford’s Gold Foil experiment?

25. (1 point each) What is the most reactive element? (state why too)

26. (4 points) What is the order from lowest to highest for Atomic radius and Electronegativity for the following: S, P, Ar, Cl, Si

27. (1 point) Where is the energy stored in a chemical compound?

28. (1 point)Ionic solids are held together by ______.

29. (4 points) What are the properties of Ionic and Covalent bonds?

30. (3 points)Covalent or Ionic: AlPO4, NaCl, CO2

31. (3 points) Write the Ionic Chemical formula for the following: Barium fluoride, Tin (II) oxide, Titanium (III) Phosphate

32. (3 points) Write the Ionic Name of the following: Fe2O3, NaI, KHCO3

33. Write the Covalent Name of the following: CCl4, N2O5

34. Write the formula of the following Covalent molecules: Sulfur tetrafluoride, Nonabromine octaiodide

35. What are Van der Waal forces?

36. Atoms in polar covalent molecules are held together by ______electrons while nonpolar ones are held together by ______sharing of electrons.

37. (4 points) Draw the VSEPR structure, name the structure, and give the bond angle: CO,

2 38. Find the oxidation state of the following: (Find Br) KBr, (Find Sn) SnI2

39. Name the following Acids: H3PO3 and HF

40. What is the molar mass of C6H5OH (phenol)?

41. Determine the Percentage composition of CO(NH2)2.

42. Find the EF of 29.44g of C, 23.55g of S, and 47g of O.

43. Find the MF of a substance with a molecular molar mass of 78.12 g/mol and the EF is CH.

44. State the 2 requirements for an organic substance.