Ch. 4-5 Review

#1 – 10 Writing Formulas

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

2. Write the formula for: hydrochloric acid HCl

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

4. Write the formula for: potassium hydroxide KOH

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

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

7. Write the formula for: sulfur dioxide SO 2

8. Write the formula for: magnesium chloride MgCl 2

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

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

#11 – 20 Naming

11. Name this compound: NaBr sodium bromide

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

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

14. Name this compound: HNO 3 nitric acid

15. Name this compound: CaI 2 calcium iodide

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

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

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

19. Name this compound: BF 3 boron trifluoride

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

#21 – 28 Scientific Notation

21) 3.5x ) 4.01x ) 6.78x ) 2.254x10 6 Write each number in ‘ordinary’ notation

25) ) ) ) Write each number in scientific notation. 2.5x x x x10 -3

#29 – 32 Metric Conversions

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

#33 – 44 Significant Figures

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

37) ) ) 1.257x ) Round each of these to 3 sig figs x

41) 22 ÷ 17 = 42) 3.25 x = 43) = 44) – 51.5 = Calculate an answer and round to the correct number of sig figs

#45-46 Density

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

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