ACS CHEMISTRY GENERAL EXAM 2024 ACTUAL EXAM 2 VERSIONS (VERSION A AND B) COMPLETE 400 QUESTIONS WITH DETAILED VERIFIED ANSWERS /ALREADY GRADED A+

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1. A 1200 mL sample of helium is at a pressure of 350 mmHg and a temperature of
300K. What volume will this gas sample occupy if the pressure is increased to
700mmHg and the temperature is increased to 400K
- ANSWER-800mL

2. A 17.0 g sample of impure nickel metal reacts under standard conditions with
25.0L of CO to form 6.25L of Ni(CO)4 gas, what is the percentage of Ni in the
metal sample?
- ANSWER-96.4%

3. A 6.80 g coin was dissolved in nitic acid and 6.21 g of AgCl was precipitated by
the addition of excess sodium chloride.

4. Calculate the percentage of silver in the coin.
- ANSWER-75.3%

5. A catalyst will
- ANSWER-Alter the pathway (mechanism) of a chemical reaction.

6. A certain atom has the symbol 148/73Px. What does the symbol tell about an
atom of the element?
- ANSWER-It has 75 neutrons in the nucleus

7. A given amount of electric charge deposits 2.159g of silver from AG^+ solution.
What mass of copper Cu^2+ solution will be deposited by the same quantity of
electric charge?
- ANSWER-0.635g

8. A lithium carbide reacts with water as follows
9. LixCy + H2O -> LiOH + C2H2 (unbalanced)
10. What is the simplest formula of the carbide?
- ANSWER-LiC

11. A sample of nitrogen at pressure P is contained in a sealed syringe with a
movable piston. If the volume of the sample were doubled and the absolute

, temperature tripled, the new pressure of the gas would be
- ANSWER-1.5P

12. A student determines the mass of an object using a triple beam balance which is
sensitive to 0.01 g. When the beam balances, the rider on one beam is in the
notch marked 60 g, the rider on another beam in the notch marked 7 g, and the
rider on the third beam, which is graduated by hundredths of a gram, is at zero.
Considering significant figures, what mass should be recorded?A student
determines the mass of an object using a triple beam balance which is sensitive
to 0.01 g. When the beam balances, the rider on one beam is in the notch
marked 60 g, the rider on another beam in the notch marked 7 g, and the rider on
the third beam, which is graduated by hundredths of a gram, is at zero.
Considering significant figures, what mass should be recorded?
- ANSWER-67.00 g

13. According to the Lewis definition, an acid is a species
- ANSWER-accepting a pair of electrons

14. All are examples of Lewis acid-base reactions except
15. Cu2+(aq) + 4NH3(aq) →← [Cu(NH3)4]2+(aq)
16. HCl(g) + NH3(g) → NH4Cl(s)
17. H+(aq) + OH-(aq) →← H2O(l)
18. 2Na(s) + Cl2(g) → 2NaCl(s)
- ANSWER-2Na + Cl2 -> 2NaCl(s)

19. All are potential Lewis bases except
20. NH3
21. H2O
22. CH4
23. CN-
- ANSWER-CH4

24. An amino acid has a molar mass of 776.9 gmol^- and contains 65.34% iodine by
mass. What is the number of iodine atoms per molecule of amino acid.
- ANSWER-4

25. An enclosed mixture has a mass of 12.69723±0.00003 g, and after a chemical
change occurs the
26. mixture has a mass of 12.69724±0.00003 g. These results show that
- ANSWER-the mass of enclosed mixture remains constant within the
experimental error of the measurement

27. An sp hybridized central atom can be used to describe the bonding in
- ANSWER-NaOH forms no white precipitate with any other ion except
28. Mg2