2. Ch. 4-5 Review

3. #1 – 10 Writing Formulas

4. 1. Write the formula for: ammonium chloride NH 4 Cl

5. 2. Write the formula for: hydrochloric acid HCl

6. 3. Write the formula for: sodium sulfide Na 2 S

7. 4. Write the formula for: potassium hydroxide KOH

8. 5. Write the formula for: chromium (III) oxide Cr 2 O 3

9. 6. Write the formula for: sulfuric acid H 2 SO 4

10. 7. Write the formula for: sulfur dioxide SO 2

11. 8. Write the formula for: magnesium chloride MgCl 2

12. 9. Write the formula for: copper (II) oxide CuO

13. 10. Write the formula for: sodium acetate NaC 2 H 3 O 2

14. #11 – 20 Naming

15. 11. Name this compound: NaBr sodium bromide

16. 12. Name this compound: CoCl 2 cobalt(II) chloride

17. 13. Name this compound: N 2 O 5 dinitrogen pentoxide

18. 14. Name this compound: HNO 3 nitric acid

19. 15. Name this compound: CaI 2 calcium iodide

20. 16. Name this compound: NH 4 NO 3 ammonium nitrate

21. 17. Name this compound: Fe 2 O 3 iron(III) oxide

22. 18. Name this compound: HC 2 H 3 O 2 acetic acid

23. 19. Name this compound: BF 3 boron trifluoride

24. 20. Name this compound: Na 2 SO 4 sodium sulfate

25. #21 – 28 Scientific Notation

26. 21) 3.5x10 -3 22) 4.01x10 4 23) 6.78x10 -2 24) 2.254x10 6 Write each number in ‘ordinary’ notation 0.0035 40100 0.0678 2254000

27. 25) 2500 26) 327000 27) 0.12 28) 0.00405 Write each number in scientific notation. 2.5x10 3 3.27x10 5 1.2x10 -1 4.05x10 -3

28. #29 – 32 Metric Conversions

29. 29) 225 cm  m 30) 755 mL  L 31) 0.065 g  mg 32) 0.125 kL  L Convert each metric measurement. 2.25 m 0.755 L 65 mg 125 L

30. #33 – 44 Significant Figures

31. 33) 3.5x10 -3 cm 34) 4.01x10 4 mL 35) 0.0405 L 36) 250 m Count the sig figs in each measurement. 3.5x10 -3 = 2 s.f. 4.01x10 4 = 3 s.f. 0.0405 = 3 s.f. 250 = 2 s.f.

32. 37) 435267 38) 0.03506 39) 1.257x10 3 40) 0.30025 Round each of these to 3 sig figs. 435000 0.0351 1.26x10 3 0.300

33. 41) 22 ÷ 17 = 42) 3.25 x 10.15 = 43) 12.01 + 2.45 = 44) 111.75 – 51.5 = Calculate an answer and round to the correct number of sig figs. 1.3 33.0 14.46 60.3

34. #45-46 Density

35. 45. If an object has a volume of 22.0 mL and a mass of 33.0 g, what is its density? 1.50 g/mL

36. 46. Gold has a density of 19.31 g/cm 3. How much would a gold ring weigh if it had a volume of 1.50 mL? 29.0 g