Chemistry

Mixtures that would be considered buffers include which of the following

0.10 M HF + 0.10 M NaF (II only)

Which of the following has the lowest conductivity?

0.1 M HF

The pH of a solution prepared by the addition of 10. mL of 0.002 M KOH(aq) to 10. mL of distilled water is closest to

11

The weight of H2SO4 in 50.0 mL of a 6.0 molar solution is

29.4 grams

An oxidation-reduction reaction that is also a synthesis reaction

2Mg(s) + O2(g) --> 2MgO(s)

If 87 g of K2SO4 (molar mass 174 g) is dissolved in enough water to make 250 mL of solution, what are the concentrations of potassium and sulfate ion respectively?

4.0 and 2.0 M

What is the maximum mass of SO2 that could be removed by 1000 liters of the KOH solution?

8.0 kg

HgO(s) + 4I- + H2O <-> HgI4^2- + 2OH- Consider the equilibrium above, which of the following changes will increase the concentration of HgI4^2-?

Adding 6M HNO3

Barium sulfate is LEAST soluble in a 0.01-molar solution of which of the following?

Al2(SO4)3

Has amphoteric properties

Aluminum hydroxide

J.J Thomson's cathode ray experiments

Atoms contain electrons

Ascorbic acid, H2C6H6O6, is a diprotic acide with a K1= 7.9 E-5 and a K2=1.6E-12. In a .005 M aq solution of ascorbic acid which of the following species is present in the lowest concentration.

C6H6O6^2-(aq)

Which of the following does NOT behave as an electrolyte when it is dissolved in water?

CH3OH

Which of the following acids can be oxidized to form a stronger acid

H2SO3

A buffer at pH<6

H3PO4 and NaH2PO4

At 25°C and 1 atm, is a strong electrolyte in aqueous solution

HBr

Are the most likely to form anions

Halogens

Hafnium metal heated in chlorine gas (62.2 percent Hf and 37.4 percent Cl by mass), what is the empirical formula for this compound?

HfCl3

Appropriate uses of a visible-light spectrophotometer include which of the following?

I. Determining the concentration of a solution of Cu(NO3)2 (I only)

A compound contains 1.10 mol of K, 0.55 mol of Te, and 1.65 mol of O. What is the simplest formula of this compound?

K2TeO3

Which of the following best explains why sodium sulfate is a better conductor of electricity than sodium chloride?

More moles of ions are present in a given volume of 0.10 M Na2SO4 than in the same volume of 0.10 M NaCl.

The most nearly neutral solution

NH3 and HC2H3O2 (acetic acid)

A buffer at pH>8

NH3 and NH4Cl

Forms monatomic ions with 2- charge in solutions

S

In which of the following species does sulfur have the same oxidation number as it does in H2SO4?

SO2Cl2

Relatively slow rates of chemical reactions are associated with

strong bonds in reactant molecules

H2Se(g) + 4O2F2(g) --> SeF6 + 2HF(g) + 4O2(g) Which of the following is true regarding the reaction represented above?

The oxidation number of Se changes from -2 to +6

6I- + 2MnO4- + 4H2O(l) --> 3I2(s) + 2MnO2(s) + OH- Which of the following statements regarding the reaction represented by the equation above is correct?

The oxidation number of iodine changes from -1 to 0.

3Cu(s) + 8H+(aq) + 2NO3-(aq) --> 3Cu2+(aq) + 2NO(g) + 4H2O(l) True statements about the reaction represented above include which of the following?

The oxidation state of nitrogen changes from +5 to +2

Rutherford's experiments

The positive charge of an atom is concentrated in a small region

A solution prepared to be initially 0.5 M in CH3COOH and 1 M in CH3COONa

a buffer solution with a pH between 4 and 7

A solution prepared to be initially 1 M in Na2CO3 and 1 M in CH3COONa

a solution with a pH greater than 7 that is not a buffer solution

A solution prepared to be initially 1 M in NaCl and 1 M in HCL.

a solution with a pH less than 7 that is not a buffer solution