June 2008 Chemistry Regents #1-10

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

 

Questions

Answer Explanations
1 An atom in the ground state has seven valence electrons. This atom could be an atom of which element?
(1) calcium      (3) oxygen
(2) fluorine      (4) sodium
2 group 17
2 What is the total number of electrons in an atom of potassium?
(1) 18     (3) 20
(2) 19     (4) 39
2 atom   protons =electrons

atomic #

3 A proton has a charge that is opposite the charge of
(1) an alpha particle     (3) an electron
(2) a neutron                (4) a positron
3 proton +

electron -

4 Which conclusion was a direct result of the gold foil experiment?
(1) An atom is mostly empty space with a dense, positively charged nucleus.
(2) An atom is composed of at least three types of subatomic particles.
(3) An electron has a positive charge and is located inside the nucleus.
(4) An electron has properties of both waves and particles.
1 open space

positive nucleus

5 Which statement identifies the element arsenic?
(1) Arsenic has an atomic number of 33.
(2) Arsenic has a melting point of 84 K.
(3) An atom of arsenic in the ground state has eight valence electrons.
(4) An atom of arsenic in the ground state has a radius of 146 pm.
1 use RT
6 Which element has an atom with the greatest attraction for electrons in a chemical bond?
(1) As      (3) N
(2) Bi       (4) P
3 Definition of electronegativity

Table S

7 Given the balanced equation representing a reaction:
H+(aq) + OH-(aq) ==> H2O(l) + energy
In this reaction there is conservation of
(1) mass, only
(2) mass and charge, only
(3) charge and energy, only
(4) charge, energy, and mass
4 always everything is conserved
8 Which statement describes the composition of potassium chlorate, KClO3?
(1) The proportion by mass of elements combined in potassium chlorate is fixed.
(2) The proportion by mass of elements combined in potassium chlorate varies.
(3) Potassium chlorate is composed of four elements.
(4) Potassium chlorate is composed of five elements.
1 1-definition of a compound
9 As a bond between a hydrogen atom and a sulfur atom is formed, electrons are
(1) shared to form an ionic bond
(2) shared to form a covalent bond
(3) transferred to form an ionic bond
(4) transferred to form a covalent bond
2 covalent is shared electrons
10 Atoms of which element can bond to each other to form chains, rings, and networks?
(1) carbon      (3) hydrogen
(2) fluorine     (4) oxygen
1 organic chemistry questions about C

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

 
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