SGO Review Question Preview (ID: 42061)
SGO Review.
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Which of the following has 5 valence electrons
a) V
b) P
c) O
d) B
How many moles are in 45.0 grams of Argon
a) 1800 moles
b) .89 moles
c) 1.125 moles
d) 40 moles
Neon-22 contains 12 neutrons. It has how many protons?
a) 22 protons
b) 12 protons
c) 10 protons
d) 11 protons
Which substance can be broken down by chemical means?
a) Calcium
b) Lithium
c) Sulfur
d) Lithium Bromide
What is the charge of Calcium ion in Ca
a) +1
b) +2
c) +3
d) -2
What is the molar mass of CoBr3
a) 299 g/mol
b) 139
c) 80
d) 250
An atom is electrically neutral because
a) nuclear forces stabilize the charges.
b) neutrons balance the protons and electrons.
c) the numbers of protons and electrons are equal.
d) the numbers of protons and neutrons are equal.
Which of the following ordered pairs of elements shows an increase in atomic number but a decrease in average atomic mass?
a) Ag to Pd
b) Co to Ni
c) Ge to Sn
d) Cr to Mo
Consider the element with the electron configuration Kr 5s24d7. This element is a/an ____.
a) Nobel Gas
b) Alkali Metal
c) Transition Metal
d) Halogen
What is the percentage composition by mass of ammonium sulfide, (NH4)2S?
a) N: 41.1%, H: 11.8%, S: 47.1%
b) N: 28.02%, H: 8.08%, S: 32.06%
c) N: 14.01%, H: 1.01%, S: 32.06%
d) N: 29.8%, H: 2.15%, S: 68.1%
What is the formula for Calcium chromate?
a) Ca(CrO4)4
b) Ca2(CrO4)2
c) CaCrO4
d) Ca(CrO4)2
During a flame test, ions of a specific metal are heated in the flame of a gas burner. A characteristic color of light is emitted by these ions in the flame when the electrons ____.
a) gain energy as they return to lower energy levels
b) gain energy as they return to higher energy levels
c) emit energy as they return to lower energy levels
d) emit energy as they return to higher energy levels
What coefficients correctly balance the formula equation, C3H8 + O2 → CO2 + H2O?
a) 1,5,3,4
b) 1,3,4,5
c) 2,10,8,6
d) 1,5,4,3
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