August 2015  Chemistry Regents #6-10

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Questions

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Explanations

6 At STP, which substance is a noble gas?

(1) ammonia (3) neon

(2) chlorine (4) nitrogen

3 link group 18
7 At STP, oxygen exists in two forms, O2(g) and O3(g). These two forms of oxygen have

(1) different molecular structures and different properties

(2) different molecular structures and the same properties

(3) the same molecular structure and different properties

(4) the same molecular structure and the same properties

1 link allotropes-different molecular structures and different properties
8 Which statement describes a chemical property of sodium?

(1) Sodium has a melting point of 371 K.

(2) Sodium has a molar mass of 23 grams.

(3) Sodium can conduct electricity in the liquid phase.

(4) Sodium can combine with chlorine to produce a salt.

4 link look for a reaction term

 

9 Which term identifies a type of chemical reaction?

(1) decomposition (3) sublimation

(2) distillation       (4) vaporization

1 link only one is a type of reaction
10 Based on Table S, an atom of which element has the weakest attraction for electrons in a chemical bond?

(1) polonium (3) selenium

(2) sulfur       (4) tellurium

1 link definition of electronegativity

 

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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