June 2017 Chemistry Regents #1-5

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Question 51-53 Questions 54-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-76  Questions 77-80  Questions 81-82  Questions 83-85 

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1. Which statement describes the structure of an atom?

(1) The nucleus contains positively charged electrons.

(2) The nucleus contains negatively charged protons.

(3) The nucleus has a positive charge and is surrounded by negatively charged electrons.

(4) The nucleus has a negative charge and is surrounded by positively charged electrons.

3 link electrons are negative and outside the nucleus

protons are positive and are located in the nucleus with the neutral neutrons

2. Which term is defined as the region in an atom where an electron is most likely to be located?

(l) nucleus (2) orbital

(3) quanta (4) spectra

2 link electrons are located in orbitals

3. What is the number of electrons in an atom of scandium?

(1) 21 (3) 45

(2) 24 (4) 66

1 link atoms are neutral so  protons equal electrons

scandium is element number 21, which is the number of protons

 

4. Which particle has the least mass?

(1) a proton       (3) a helium atom

(2) an electron (4) a hydrogen atom

2 link proton=1 amu

helium=4amu

electron= 1/1836 amu

hydrogen=1amu

5. Which electron transition in an excited atom results in a release of energy?

(1) first shell to the third shell   

(2) second shell to the fourth shell

(3) third shell to the fourth shell  

(4) fourth shell to the second shell

 
4 link an electron that falls to a lower energy level releases energy

FYI...3 go up...  1 go down

 

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 54-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-76  Questions 77-80  Questions 81-82  Questions 83-85 

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