Which of the following is a covalent compound? Na_2O Al_2O_3 CaCl_2 CL_2O CaCl A

Question

Which of the following is a covalent compound? Na_2O Al_2O_3 CaCl_2 CL_2O CaCl A system expends from a volume of 1.00 L to 2.00 L against a constant external pressure of 1.00 atm. What is the work (w) done by the system? (1 atm = 101.3 J) a) 2.00 J b) 1.01 times 10^5 J c) 3.00 J d) 1.00 J e) 1.01 times 10^2 J When J. J. Thomson discovered the electron, what physical property of the electron did he measure? a) its charge-to-mass ratio, e/m b) its charge, e c) its temperature, T d) its atomic number, Z e) its mass, m Ethyene glycol, used as a coolant in automotive engines, has a specific heat capacity of 2.42 J/g middot degree C. Calculate q when 3.65 of ethylene glycol is cooled from 132 degree C to 85 degree C. -4.2 times 10^-6 kJ b) -420 kJ c) -99 kJ d) -0.42 kJ e) -1900 kJ How many moles are in 8.73 times 10^25 atoms of boron, B? a) 1.45 moles b) 3.84 times 10^27 moles c) 145 moles d) 5.04 times 10^-25 moles e) 6.90 times 10^-3 moles What is the oxidation number of N in N_2H_4? a) -4 b) + 4 c) +2 d) -2 e) 0 The chemical formula for iron (II) nitrate is a) Fe_2N_3 b) Fe(NO_3)_2 c) Fe_2(NO_3)_3 d) Fe(NO_2)_2 e)Ir(NO_2)_2 Which two electron configurations represent elements that would have similar chemical properties? (1) 1s^22s^22p^4 (2) 1s^22s^22p^5 (3) [Ar]4s^23d^104p^3 (4) 4s^23d^104p^4 a) (2) and (3) b) (2) and (4) c) (1) and (4) d) (1) and (2) e) (1) and (3)

Explanation / Answer

8) d because it is a bond between two ninmetals

13) d

14) b

15) c

12) c

10) a

9) e

11) b

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