Chemistry:Test 1

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Q.1:
Question refers to the following processes:
(A) Precipitation
(B) Oxidation -reduction
(C) Distillation
(D) Hydration
(E) Condensation
QUESTION :
Electrolysis of water to form hydrogen and oxygen gases
The set of lettered choices above refers to the question immediately following it. Select the one lettered choice that best fits the question.

Q.2:
Question refers to the following processes:
(A) Precipitation
(B) Oxidation -reduction
(C) Distillation
(D) Hydration
(E) Condensation
QUESTION
Reaction of silver ion with chloride ion in water solution.
The set of lettered choices above refers to the question immediately following it. Select the one lettered choice that best fits the question and then fill in the corresponding circle below.

Q.3:
Question refers to the following processes:
(A) Precipitation
(B) Oxidation -reduction
(C) Distillation
(D) Hydration
(E) Condensation
QUESTION :
Reaction of iron filings with powdered sulfur
The set of lettered choices above refers to the question immediately following it. Select the one lettered choice that best fits the question and then fill in the corresponding circle below.

Q.5: In the manufacture of semiconductors, almost pure crystals are ------- .

Q.6: Substances that exhibit two-dimensional crystalline order are said to be --------- substances.

Q.7: Substances that exhibit one-dimensional crystalline order are said to be -------- substances.

Q.8: Considering the capability of sorbing water molecules from the air, sodium carbonate is ------------- whereas sodium hydroxide is ---------- .

Q.9: In ---------- equilibrium, two opposing changes are occurring at the same speed.

Q.10: The transition of a substance directly from solid state to gaseous state is known as ----------- .

Q.11: The condensation of substances that are normally gases is called ---------- .

Q.12: A ---------- diagram shows how the states of matter in a system are affected by changes of temperature and pressure.

Q.13: Unbalanced forces account for the ----------- --------- of the liquids.

Q.14: If the hydronium ion concentration of the solution is 0.00421 M , the percent of ionization of a 0.100 M solution of formic acid is ---------- .

Q.15: The properties which are determined by the number of particles in solution rather than by the type of particles are ---------- properties .

Q.16: A membrane that allows only certain types of particles to pass through is called ----------- membrane.

Q.17: An acid which contains more than one ionizable hydrogen atoms is called a --------- acid.

Q.18: The reaction of a salt with water to form an acidic or basic solution is called --------- .

Q.19: The effect of one functional group on another functional group is called --------- effect.

Q.20:
Question refers to the following pH values:
(A) pH 1
(B) pH 3
(C) pH 7
(D) pH 9
(E) pH 13
A solution is made by adding 5.6 g of KOH (molar mass 56 g/mol) to enough water to make 1.0 L of solution. What is the approximate pH of the resulting solution?
Select the option that best fits your answer.

Q.21:
Question refers to the following possible answers:
(A) The concentration of H2 increases.
(B) The concentration of N 2 decreases.
(C) The rate of the reaction decreases.
(D) The temperature of the system decreases.
(E) The gas condenses.
Question:
2 NO (g) + H 2 (g) = N2 O (g) + H 2 O (g) + 351 kJ
If the total pressure on the system is increased when the reaction represented above is at equilibrium, which of the above-mentioned answer occurs?
Select the option that best fits your answer.

Q.23:
Question refers to the following statememts:
(A) I only
(B) II only
(C) I and II only
(D) II and III only
(E) I, II and III
At constant temperature, the change of state of any substance from liquid to gas always includes which of the following?
I.The breaking of covalent bonds
II.An increase in the randomness of the system
III.The absorption of energy
Select the option that best fits your answer.

Q.24:
To determine whether a water solution of Na 2 S2 O 3 at room temperature is supersaturated, one can
(A) heat the solution to its boiling point
(B) add water to the solution
(C) add a crystal of Na2 S2 O 3 to the solution
(D) acidify the solution
(E) cool the solution to its freezing point
Select the option that best fits your answer.

Q.25:
Raising the temperature at which a chemical reaction proceeds may do all of the following EXCEPT
(A)increase the molecular collision frequency
(B)increase the number of molecules with energy greater than the activation energy
(C)speed up the forward and reverse reactions
(D)decrease the randomness of the system
(E)change the relative concentrations of products to reactants that are present at equilibrium.
Select the option that best fits your answer.

Q.26:
Which of the following statements about catalysts is true?
(A) Increase the value of the equilibrium constant.
(B)They increase the amount of product present at equilibrium.
(C)They increase the concentration of the reactants.
(D) They are permanently altered as the reaction proceeds.
(E) They reduce the activation energy of the reaction.
Select the option that best fits your answer.

Q.27:
. . . BCl 3 (g) + H2 (g) = HCl (g) + B (s)
When the equation for the reaction represented above is balanced and all coefficients are reduced to lowest whole-number terms, the coefficient for HCl is
(A) 1
(B) 2
(C) 3
(D) 4
(E) 6
Select the option that best fits your answer.

Q.28 Question
I: A molecule of silicon tetrachloride, SiCl…, is nonpolar
BECAUSE
II : the four bonds in SiCl… are identical and the molecule has a tetrahedral structure.
State whether true or false.

Q.29 Question:
I: An element that has the electron configuration 1s†2s†2p÷3s†3p÷3d°4s† is a transition element
BECAUSE
II: in atoms of transition elements, the 1s, 2s, 2p, 3s, and 3p orbitals are completely filled in the ground state.
State whether true or false.

Q.30 Question
I: The combustion of fuels containing sulfur leads to the production of acid rain
BECAUSE
II: sulfur oxides form acid solutions in water.
State whether true or false.





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