January 2013 Chemistry Regents #1-10

Highlight to reveal answers and explanations

 

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

Questions 51 Questions 52-54 Questions 55-58 Questions 59-61 Questions 62-65 Questions 66-69

Questions 70-72 Questions 73-76 Questions 77-79 Questions 80-82 Questions 83-85

 

Other Regents Exams

Questions

Answer Links

Explanations

1 Which particles have approximately the same mass?

(1) alpha particle and beta particle

(2) alpha particle and proton

(3) neutron and positron

(4) neutron and proton

4 Link 1 amu= protons and neutrons

1/1836 amu= electrons

2 Which phrase describes an atom?

(1) a negatively charged nucleus surrounded by positively charged protons

(2) a negatively charged nucleus surrounded by positively charged electrons

(3) a positively charged nucleus surrounded by negatively charged protons

(4) a positively charged nucleus surrounded by negatively charged electrons

4 Link positive nucleus surrounded by negative electron cloud

3 An orbital is defined as a region of the most probable location of

(1) an electron     (3) a nucleus

(2) a neutron        (4) a proton

1 Link definition of electron orbital

 

4 The bright-line spectrum of an element in the gaseous phase is produced as

(1) protons move from lower energy states to higher energy states

(2) protons move from higher energy states to lower energy states

(3) electrons move from lower energy states to higher energy states

(4) electrons move from higher energy states to lower energy states

4 Link electrons fall (higher to lower) releasing energy in the form of light

5 An atom of lithium-7 has an equal number of

(1) electrons and neutrons

(2) electrons and protons

(3) positrons and neutrons

(4) positrons and protons

2 Link atoms are neutral, so protons equal electrons

6 In which type of chemical reaction do two or more reactants combine to form one product, only?

(1) synthesis

(2) decomposition

(3) Single replacement

(4) double replacement

1 Link synthesis definition

 

7 Which statement explains why neon is a Group 18 element?

(1) Neon is a gas at STP.

(2) Neon has a low melting point.

(3) Neon atoms have a stable valence electron configuration.

(4) Neon atoms have two electrons in the first shell.

3 Link group 18 are inert  (unreactive) due to the valence electron configuration

8 Which element has chemical properties that are most similar to the chemical properties of fluorine?

(1) boron       (3) neon

(2) chlorine     (4) oxygen

2 Link same group, similar properties

 

9 What occurs as two atoms of fluorine combine to become a molecule of fluorine?

(1) A bond is formed as energy is absorbed.

(2) A bond is formed as energy is released.

(3) A bond is broken as energy is absorbed.

(4) A bond is broken as energy is released.

2 Link making bonds releases energy

10 What is the number of pairs of electrons that are shared between the nitrogen atoms in a molecule of N2?

(1) 1

(2) 2

(3) 3

(4) 6

3 Link Nitrogen bonds 3 times, it has 5 valence electrons

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

Questions 51 Questions 52-54 Questions 55-58 Questions 59-61 Questions 62-65 Questions 66-69

Questions 70-72 Questions 73-76 Questions 77-79 Questions 80-82 Questions 83-85

 
Back to Regents Exams