January 2015 Chemistry Regents #1-5

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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

Question 51-53 Questions 54-55
Questions 56-58 Questions 59-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-81 Questions 82-85

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Questions

Answer Links

Explanations

1 According to the modern model of the atom, the nucleus of an atom is surrounded by one or more

(1) electrons    (3) positrons

(2) neutrons     (4) protons

1 Link electrons are outside the nucleus in the cloud
2 Which particle has a mass of approximately 1 atomic mass unit?

(1) an alpha particle (3) an electron

(2) a beta particle (4) a neutron

4 Link look at the mass number on table N

or know that protons and neutrons have a mass of 1 amu

3 A specific amount of energy is emitted when excited electrons in an atom in a sample of an element return to the ground state. This emitted energy can be used to determine the

(1) mass of the sample

(2) volume of the sample

(3) identity of the element

(4) number of moles of the element

3 Link Line Spectra is unique to every element and can be used to identify an element

 

4 According to the wave-mechanical model, an orbital is defined as the

(1) circular path for electrons

(2) circular path for neutrons

(3) most probable location of electrons

(4) most probable location of neutrons

3 Link An orbital is defined as the most probable location for finding an electron. 
5 All phosphorus atoms have the same

(1) atomic number

(2) mass number

(3) number of neutrons plus the number of electrons

(4) number of neutrons plus the number of protons

1 Link No two elements have the same atomic number (or the same number of protons), so the atomic number identifies the element.

 

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

Question 51-53 Questions 54-55
Questions 56-58 Questions 59-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-81 Questions 82-85

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