Q: A sample of gas occupies 2.00 L at 1.00 atm and 273 K. What will be its volume at 2.00 atm and 273 K?

$$V_2$$ = $$V_1$$ \times \frac{$$P_1$$}{$$P_2$$}$$, so V_2$ = 2.00 \times \frac{1.00}{2.00} = 1.00 L$$

Question 1

Which of the following compounds is expected to be soluble in water according to the solubility rules?

Accepted Answer

Na\_2SO\_4

Question 2

A sample of gas occupies 2.00 L at 1.00 atm and 273 K. What will be its volume at 2.00 atm and 273 K?

Accepted Answer

$$V_2$$ = $$V_1$$ 	imes \frac{$$P_1$$}{$$P_2$$}$$, so V_2$ = 2.00 	imes \frac{1.00}{2.00} = 1.00 L$$

Question 3

Which of the following is a strong electrolyte?

Accepted Answer

HNO\_3

Question 4

Which of the following reactions is a redox reaction?

Accepted Answer

$$Zn(s) + 2HCl(aq) \rightarrow $$ZnCl_2$$(aq) + H_2$(g)$$

Question 5

What is the oxidation number of phosphorus in the hydrogen phosphate ion, $$HPO_4$$^{2-}$$?

Accepted Answer

+5

Question 6

Which of the following elements will react most rapidly, if at all, with water?

Accepted Answer

Na

Question 7

A solution contains $$NH_4$$^+$$ and SO_4$^{2-}. $$What can be said about its solubility?

Accepted Answer

It is soluble in water

Question 8

Which of the following is the correct balanced equation for the reaction of iron(II) sulfide with hydrochloric acid to form iron(II) chloride and hydrogen sulfide gas?

Accepted Answer

$$FeS(s) + 2HCl(aq) \rightarrow $$FeCl_2$$(aq) + H_2S(g)$$

Question 9

Which of the following is a correct statement about the reaction $$Zn(s) + 2HCl(aq) \rightarrow $$ZnCl_2$$(aq) + H_2$(g)$$?

Accepted Answer

Zn is the reducing agent because it loses electrons

Question 10

Which of the following molecules does chlorine have the highest oxidation number?

Accepted Answer

ClO\_4\^-

Question 11

What is the change in oxidation number of manganese in the following reaction: $$KMnO_4$$ \rightarrow $$MnO_2$$?

Accepted Answer

Mn gains five electrons

Question 12

Which of the following is the correct net ionic equation for the reaction between copper(II) chloride and sodium hydroxide?

Accepted Answer

$$Cu^{2+}(aq) + 2OH^-(aq$$) \rightarrow Cu(OH)_2(s)$$

Question 13

Which of the following is a correct statement about colligative properties?

Accepted Answer

They depend on the number of solute particles

Question 14

Which of the following is the correct formula for the calculation of the change in boiling point due to a solute?

Accepted Answer

$$\Delta T_b = iK_bm$$

Question 15

Which of the following is a correct statement about the activity series of metals?

Accepted Answer

A metal higher in the series will displace a metal lower in the series from solution

Question 16

Which of the following is the correct formula for the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 17

Which of the following is a correct statement about the reaction $$2H_2O_2(aq) \rightarrow 2H_2O(l) + O_2$(g)$$?

Accepted Answer

It is a decomposition reaction

Question 18

Which of the following is the correct formula for the calculation of energy in thermodynamics?

Accepted Answer

$$E = q + w$$

Question 19

Which of the following is the correct formula for the calculation of the change in enthalpy?

Accepted Answer

$$\Delta H = \Sigma H_{products} - \Sigma H_{reactants}$$

General Chemistry: test 3 example

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