2003 August Chemistry Regents Exam #11-20

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

 

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QuestionsAnswersExplanations
11. Which type of bond is formed when electrons are transferred from one atom to another?

A, covalent
B. ionic
C. hydrogen
D. metallic

 

Bionic -transferred

covalent-sharing

12. Which Lewis electron-dot structure is drawn correctly for the atom it represents?

A.12a.gif
B.12b.gif
C.12c.gif
D.12d.gif

 

DNe has 8 valence electrons so 8 dots
13. What occurs when an atom of chlorine forms a chloride ion?

A. The chlorine atom gains an electron, and its radius becomes smaller.
B. The chlorine atom gains an electron, and its radius becomes larger.
C.  The chlorine atom loses an electron, and its radius becomes smaller.
D.  The chlorine atom loses an electron, and its radius becomes larger.

Bnonmetals gain electrons to fill their valence shell

they get larger

the ratio of electrons to protons is bigger

14. Which substance can not be decomposed by a chemical change?

A. Ne
B. N2O
C. HF
D.  H2O

 

ADefinition of an element

 

Compounds can be broken down

15. Which of these substances has the strongest intermolecular forces?

A. H2O
B. H2S
C. H2Se
D. H2Te

 

ATypical hydrogen bonding question

notice all answers have H

Hydrogen bonding involves H bonded to " F O N"

strongest dipole dipole attraction

16. A real gas behaves more like an ideal gas when the gas molecules are

A. close and have strong attractive forces between them
B. close and have weak attractive forces between them
C. far apart and have strong attractive forces between them
D. far apart and have weak attractive forces between them

Dgases are very far apart and have very little attraction

liquids would be close together and have attraction

17. Which phase change is an exothermic process?

A.16a.gif
B.16b.gif
C.16c.gif
D.16d.gif

 

BYou must lose energy to condense.

OR

S---------->G

S       L<----G

S--->L

S       L---->G

notice only one is going left

18. Which of these contains only one substance?

A. distilled water
B. sugar water
C. saltwater
D. rainwater

 

Aall the others are mixtures
19. In which group of the Periodic Table do most of the elements exhibit both positive and negative oxidation states?

A.  17
B.  2
C.  12
D.  7

 

Alook at the elements on the PT 
20. At the same temperature and pressure, 1.0 liter of CO(g) and 1.0 liter of CO2(g) have

A. equal masses and the same number of molecules
B. different masses and a different number of molecules
C. equal volumes and the same number of molecules
D. different volumes and a different number of molecules

CAvogadros Hypothesis-equal volumes of gases contain the same number of particles

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