General Chemistry Answers

The compound Mg(OH)2 is classified as an Arrhenius base because, when the compound dissolves in water, there is an increase in the concentration of which of the following ions?

A. Hydrogen ions

B. Hydroxide ions

C. Magnesium ions

D. Oxide ions

The equation below shows the reaction of ammonia with water. NH3(g) +H2O(l) ↔ NH4+(aq) + OH-(aq). According to the Brønsted-Lowry theory of acids and bases, which of the following is acting as the acid for the forward reaction?

A. NH3

B. H2O

C. NH4+

D. OH-

The equation below represents an equilibrium reaction HNO3(aq) + NH3(aq) ↔ NO3- (aq) + NH4+(aq). Which chemical in the forward reaction is a Bronsted-Lowry acid? *

A. HNO3

B. NH3

C. NO3-

D. NH4+

What is the new volume of a 61 L sample at STP that is moved to 183 K and 0.60 atm?

A 4.3 grams sample of a gaseous compound was found to have a volume of 1182.6 mL at 73.1 degrees and pressure of 576 torr. What is the molar mass of this compound?

An electron jump in a hydrogen atom from n=5 to n=2 produces a violet spectral line with a wavelength of 434nm. if an electron in a helium atom makes the same jump what will it do

) Which ion does NOT have a noble gas configuration in its ground state?

           A) Si4+

           B) Al3+

           C) Sn2+

           D) Se2-

           E) All of the above

) How many electrons are in the outermost shell of the P3- ion in its ground state?

           A) 2

           B) 3

           C) 6

           D) 8

E) 7

) How many unpaired electrons are there in the ground state of C?

           A) 0

           B) 4

           C) 3

           D) 2

           E) 1

An element that has the valence electron configuration 6s26p3 belongs to which

      period and group?

           A) period 5; group 5A

           B) period 5; group 7A

           C) period 6; group 5A

           D) period 6; group 7A

           E) period 5; group 8A