Long Quiz number 1 Analytical Chem (Lec).pptx

Long Quiz number 1 Analytical Chem (Lec).pptx

1. Long Quiz #1 Analytical Chem ( Lec ) Prepared by: Joshue Solitario

2. Test I. Multiple Choice. Choose the letter of the best answer.

3. a) A heterogeneous mixture of substances b) A homogenous mixture of two or more substances c) A mixture of solids only d) A mixture of gases only

4. a) The substance in smaller quantity in a solution b) The substance that dissolves the solute c) The solute in a concentrated solution d) A substance that cannot dissolve other

5. a) Weight of solute per liter of solvent b) Weight of solute per volume of solvent c) Weight of solute per 100 parts by weight of solution d) Weight of solvent per 100 parts by volume of solution

6. a) 20% w/w b) 25% w/w c) 50% w/w d) 10% w/w

7. a) A concentrated solution has less solute b) A concentrated solution has more solute compared to a dilute solution c) A concentrated solution has more solvent compared to a dilute solution d) A dilute solution has more solute compared to a concentrated solution

8. A) It calculates the amount of solute in a saturated solution B) It determines the ratio between solute and solvent in a solution C) It is the dilution formula, used to calculate the volume of a concentrated solution needed to make a diluted solution D) It measures the molar mass of the solute in a solution

9. a) The weight of solute per volume of solvent b) The weight of solvent per volume of solution c) The volume of solute per volume of solution d) The volume of solute per weight of solvent

10. a) 1.5 g b) 0.5 g c) 2.0 g d) 4.0 g

11. a) w/v refers to volume of solvent; w/w refers to weight of solvent b) w/v refers to weight of solute in 100 mL of solution; w/w refers to weight of solute in 100 g of solution c) w/v refers to weight of solvent in 100 mL; w/w refers to volume of solute in 100 g d) w/v and w/w are the same

12. a) moles of solute per kg of solvent b) moles of solute per liter of solution c) grams of solute per liter of solution d) grams of solute per milliliter of solution

13. a) 5% b) 10% c) 20% d) 25%

14. a) 1.54 moles of NaCl in 1 kg of solvent b) 1.54 moles of NaCl in 1 liter of solution c) 1.54 grams of NaCl in 1 liter of solvent d) 1.54 grams of NaCl in 1 kg of solvent

15. a) 40 mL b) 95 mL c) 120 mL d) 60 mL

16. a) 58.44 g b) 29.22 g c) 117.88 g d) 10.00 g

17. a) Add 45.0 g of NaCl to 500 mL of water b) Add 45.0 g of NaCl and water to a total volume of 500 mL c) Add 500 g of NaCl to 1 L of water d) Add 45.0 g of NaCl to 1 L of water

18. a) 20g b) 10g c) 5g d) 25g

19. a) Add solute to the solvent b) Add solvent to the solute slowly c) Add solvent and solute simultaneously d) Always add solute to water

20. a) The weight of water is too small for biological solutions b) The molecular weight of solute in these solutions is unknown c) The volume of solute is more important in these cases d) The molecular weight of water in these solutions is unknown

21. a) Moles of solute b) Volume of solution c) Concentration of solute d) Volume of solvent

22. a) Yes, the calculations and volumes are accurate b) No, too much acid was used c) Yes, but less acid could have been used d) No, the dilution factor was incorrect