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21. Which statement about hydrogen bonding is true?(A) hydrogen bonding is the intermolecular attrac

22. A solution of two liquids, A and B, shows negative deviation from Raoult's law. This means

23. Which of the following will cause the calculated molar mass of a compound determined by thefreez

24. A cucumber is placed in a concentrated salt solution. What is most likely to happen?(A) water wi

25. The phrase "a solid dissolved in a gas" describes a(n) (A) foam (B) sol (C) emulsion (

26. Select the correct molecular structure for .(A) pyramidal (B) tetrahedral (C) square planar (D)

26.For a particular first-order reaction, it takes 48 minutes for the concentration of thereactant t

22. The following figure depicted the variation of A,B,and C concentration variation withreaction ti

25. When proteins in solution are heated, the hydrogen bonds in proteins may be broken to result in

22. The nickel-cadmium battery cell has a standard potential of +1.20 V. The cell reaction is What i

27. Which ion is planar?(A) (B) (C) (D) (E)

23. An equilibrium mixture of CO, O2 and CO2at a certain temperature contains 0.0010 MCO2and 0.0015

23.Consider the following table of standard reduction potentials:   Which substance is the strongest

27.The reaction: 2 HI→ H2 + I2, is second order and the rate constant at 800 K is . How long will i

28. The bond angles about the carbon atom in the formaldehyde molecule, H2C = O, are about(A) 120°(B

29. How many of the following molecules and ions are linear? (A) 0(B) 1 (C) 2 (D) 3(E) 4

30. Consider the following molecules, and select the molecule(s) that fit the given statement. I: BF

24.Beta decay of produces a beta particle and(A) (B) (C) (D)

28.What are the coefficients in front of and Cu(s) when the following redoxequation is balanced in

24. Shown below is a concentration vs. time plot for the reaction 2B. For this reactionthe value of

29.Determine the number of water molecules necessary to balance the following chemical equation. (A)

31. Consider the molecular-orbital description of the anion. Which of the following statements isfa

25. An acidic solution at 25℃has(A)[H3O+] ＞ [OH-]＞1x M.(B) [H3O+] ＞ 1 x   M ＞[OH-].(C)[H3O+]=[OH-)＞1

25.Iodine-123, used in thyroid therapy, has a half-life of 13.27 hours. How many half-lives arerequi

26. For the hypothetical reaction For this- reaction, if the value of x is 4, then the value of y=_
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