August 2002 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 Subatomic particles can usually pass undeflected through an atom because the volume of an atom  is composed of
(1) an uncharged nucleus
(2) largely empty space
(3) neutrons
(4) protons
2 Atoms are mostly open space, it went through.
2 What is the total number of electrons in the valence shell of an atom of aluminum in the ground state?
(1) 8     (3) 3
(2) 2     (4) 10
3 last number of electrons

2-8-3

3 Which of these elements has physical and chemical properties most similar to silicon (Si)?
(1) germanium (Ge)   (3) phosphorus (P)
(2) lead (Pb)             (4) chlorine (Cl)
1 Same Group
4 What is the total number of protons in the nucleus of an atom of potassium-42?
(1) 15 (3) 39
(2) 19 (4) 42
2 Atomic number of potassium
5 Given the equation: H2O(s) <-->H2O(l)  At which temperature will equilibrium exist  when the atmospheric pressure is 1 atm?
(1) 0 K        (3) 273 K
(2) 100 K    (4) 373 K
3 melting point of water (also freezing pt)
6 Which species represents a chemical compound?
(1) N2      (3) Na
(2) NH4+ (4) NaHCO3
4 2 or more bonded element (neutral)
7 Which mixture can be separated by using the
equipment shown below?


(1) NaCl(aq) and SiO2(s)
(2) NaCl(aq) and C6H12O6(aq)
(3) CO2(aq) and NaCl(aq)
(4) CO2(aq) and C6H12O6(aq)

1 filtrations separates out solids from liquids and aq
8 Which reaction represents natural nuclear
decay?
3 natural 1 reactant, also look for the isotopic notation
9 If an equation is balanced properly, both sides of
the equation must have the same number of
(1) atoms
(2) coefficients
(3) molecules
(4) moles of molecules
1 atoms
10 Which of the following elements has the highest
electronegativity?
(1) H      (3) Al
(2) K      (4) Ca
1 tableS

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