June 2010 Chemistry Regents #31-40

Highlight to reveal answers and explanations

Back to Regents Exams

 

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

 Questions 51-53 Questions 54-55 Questions 56-58 Questions 59-61 Questions 62-64 Questions 65-68 Questions 69-71 Questions 72-75 Questions 76-79 Questions 80-83

 

Questions

Answer Explanations
1 Isotopes same number of protons different number of neutrons
3 3 valence electrons
33 Which element forms a compound with chlorine with the general formula MCl?
(1) Rb   (3) Re
(2) Ra   (4) Rn
1 Cl is 1- so M must be 1+ so it is in group 1
34 A sample of an element has a mass of 34.261 grams and a volume of 3.8 cubic centimeters. To which number of significant figures should the calculated density of the sample be expressed?
(1) 5    (3) 3
(2) 2    (4) 4
2 dividing (the sig figs will match the least number of sig figs used

3.8 has only 2 sig figs

35 Which characteristics both generally decrease when the elements in Period 3 on the Periodic Table are considered in order from left to right?
(1) nonmetallic properties and atomic radius
(2) nonmetallic properties and ionization energy
(3) metallic properties and atomic radius
(4) metallic properties and ionization energy
3 left side are metals right are nonmetals

use table S for radius

36 Which formula is both a molecular and an empirical formula?
(1) C6H12O6    (3) C3H8O
(2) C2H4O2     (4) C4H8
3 Empirical is fully reduced to the simplest whole number ratio
37 An atom of argon in the ground state tends not to bond with an atom of a different element because the argon atom has
(1) more protons than neutrons
(2) more neutrons than protons
(3) a total of two valence electrons
(4) a total of eight valence electrons
4 full valence shell of 8 electrons is stable and generally unreactive
3 HARDEST Question

the C-C bond is nonpolar

39 Which compound has the lowest vapor pressure at 50C?
(1) ethanoic acid    (3) propanone
(2) ethanol             (4) water
1 Table H
1 Find the endothermic reaction

Delta H will be positive,  the product of this is the answer

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

 Questions 51-53 Questions 54-55 Questions 56-58 Questions 59-61 Questions 62-64 Questions 65-68 Questions 69-71 Questions 72-75 Questions 76-79 Questions 80-83

 
Back to Regents Exams