January 2015 Chemistry Regents #31-35

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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

31 What is the number of electrons in an Al3+ ion?

(1) 10 (3) 3

(2) 13 (4) 16

1 Link Metal ions have lost electrons

#electrons = #protons-3

32 The valence electron of which atom in the ground state has the greatest amount of energy?

 (1) cesium (3) rubidium

 (2) lithium (4) sodium

1 Link look for the atom with electrons in the highest energy level

or look at the ionization energy

33 The numbers of protons and neutrons in each of four different atoms are shown in the table below.

Which two atoms represent isotopes of the same element?

(1) A and D   (3) E and D

 (2) A and G   (4) E and G

3 Link Isotope-Same number of protons different number of neutrons

 

34 Which elements have the most similar chemical properties?

(1) boron and carbon

 (2) oxygen and sulfur

(3) aluminum and bromine

(4) argon and silicon

2 Link Elements in the same group

(above or below each other on the PT)

35 Which element reacts with oxygen to form ionic bonds?

(1) calcium (3) chlorine

(2) hydrogen (4) nitrogen

1 Link Metal and nonmetals=IONIC Bond

look for a metal

 

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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