August 2005 Chemistry Regents #11-20

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

 

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Questions

Answer Explanations
11 Which type of bonding is found in all molecular substances?
(1) covalent bonding      (3) ionic bonding
(2) hydrogen bonding    (4) metallic bonding
1 molecular is covalent
12 An aqueous solution of sodium chloride is best classified as a
(1) homogeneous compound
(2) homogeneous mixture
(3) heterogeneous compound
(4) heterogeneous mixture
2 solution is homogeneous
13 What is the total number of electrons shared in a double covalent bond between two atoms?
(1) 1     (3) 8
(2) 2     (4) 4
4 2 electrons = 1 bond
14 Which formula represents a nonpolar molecule?
(1) H2S    (3) CH4
(2) HCl    (4) NH3
3 draw them, nonpolar is symmetrical
15 What occurs when an atom loses an electron?
(1) The atomís radius decreases and the atom becomes a negative ion.
(2) The atomís radius decreases and the atom becomes a positive ion.
(3) The atomís radius increases and the atom becomes a negative ion.
(4) The atomís radius increases and the atom becomes a positive ion.
2 lose electron become positive and decrease in size
16 Two samples of gold that have different temperatures are placed in contact with one another. Heat will flow spontaneously from a sample of gold at 60įC to a sample of gold that has a temperature of
(1) 50įC     (3) 70įC
(2) 60įC     (4) 80įC
1 heat flows from hot to cold
17 Under which conditions of temperature and pressure would helium behave most like an ideal gas?
(1) 50 K and 20 kPa      (3) 750 K and 20 kPa
(2) 50 K and 600 kPa    (4) 750 K and 600 kPa
3 ideal gas=ideal vacation

high temp and low pressure

18 A sample of oxygen gas is sealed in container X. A sample of hydrogen gas is sealed in container Z. Both samples have the same volume, temperature,
and pressure. Which statement is true?
(1) Container X contains more gas molecules than container Z.
(2) Container X contains fewer gas molecules than container Z.
(3) Containers X and Z both contain the same number of gas molecules.
(4) Containers X and Z both contain the same mass of gas.
3 same volume under the same conditions same number of molecules

Avagodro's Hypothesis

2 unsaturated=double or triple bonded

hydrocarbon= only hydrogen and carbon

1 5 carbons pent-

double bond -ene

at the second carbon 2-

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

 
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