June 2015  Chemistry Regents #41-45

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41 A mixture consists of sand and an aqueous salt solution. Which procedure can be used to separate the sand, salt, and water from each other?

(1) Evaporate the water, then filter out the salt.

(2) Evaporate the water, then filter out the sand.

(3) Filter out the salt, then evaporate the water.

(4) Filter out the sand, then evaporate the water.

4 link salt dissolves in water and sand does not
42 An aqueous solution has a mass of 490 grams containing 8.5x103 gram of calcium ions. The concentration of calcium ions in this solution is

(1) 4.3 ppm     (3) 17 ppm

(2) 8.5 ppm     (4) 34 ppm

3 link (8.5x103 gram/490 grams) *1,000,000
43 A sample of hydrogen gas at 2.0 atmospheres and 273 K occupies a volume of 5.0 liters. The gas sample is completely transferred to a 10.0-liter sealed, rigid container. What is the new pressure of the gas sample when the temperature returns to 273 K?

(1) 1.0 atm      (3) 3.0 atm

(2) 2.0 atm      (4) 4.0 atm

1 link PV=PV (temp stays the same)

2.0atm*5.0L= P*10.0L

 

44 Given the equation for a system at equilibrium:

N2(g) + 3H2(g) ==>2NH3(g) + energy

 If only the concentration of N2(g) is increased, the concentration of

(1) NH3(g) increases

(2) NH3(g) remains the same

(3) H2(g) increases

(4) H2(g) remains the same

1 link shifts right, products increase, reactants decrease
45 A hydrocarbon molecule has seven carbon atoms in a straight chain. There is a double bond between the third carbon atom and the fourth carbon atom in the chain. The IUPAC name for this hydrocarbon is

(1) 3-heptyne     (3) 3-heptene

(2) 4-heptyne     (4) 4-heptene

3 link lowest carbon with Double Bond is 3-

7 carbons...hept

double bond...ENE

 

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-54 Questions 55-57 Questions 58-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-74  Questions 75-76  Questions 77-78  Questions 79-80  Questions 81-82  Questions 83-85

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