cole final set #1
what is the electron configuration for potassium, K a. 1s2 2s2 2p6 3s2 3p6 4s1 b. 1s2 2s2 2p6 3s2 3p1 c. 1s2 2s2 2p6 3s2 3p3 d. 1s2 2s2 2p6 3s2 3p6 4s2 3d1
a
what is the formula for ammonium sulfate a. (nh4)2so4 b. (am4)2so4 c. (nh3)2so4 d. (am3)2so4
a
what is the molar mass of te2o4 a. 319.2 g/mol b. 440.94 g/mol c. 127.60 g/mol d. 64.65 g/mol
a
what is the formula for ammonium bromide a. nhbr b. nh4br c. nh4br2 d. nh3br
b
1 mole of anything is 6.022 E^23 a. true b. false
a
a chemical change can be defined as the making and breaking of chemical bonds a. true b. false
a
according to the aufbau principle electrons fill lower energy levels before filling higher energy levels a. true b. false
a
aluminum has how many valence electrons a. 3 b. 4 c. 5 d. 6 e. none of the above
a
an exothermic reaction releases heat into the surroundings a. true b. false
a
electrons are lost from the s-orbital before the d-orbital a. true b. false
a
electrons are negatively charged and found in orbitals around the nucleus a. true b. false
a
how many grams are in 1.92 moles of pure lead (pb) metal a. 398 g b. 354 g c. 398.2 g d. 354.2 g
a
how many moles ar win 25.5 grams of neon gas (this is a monoatomic atom) a. 1.26 mol b. 2.32 mol c. 0.65 mol d. 4.3 mol
a
metals almost always lose electrons a. true b. false
a
non-metals gain electrons a. true b. false
a
pauli exclusion principle states that electrons of the same spin will not occupy the same orbital a. true b. false
a
sodium has how many valence electrons a. 1 b. 2 c. 3 d. 5 e. none of the above
a
the atomic weight for osmium is 190.23 g/mol a. true b. false
a
triple bonded oxygen has a positive charge a. true b. false
a
what is the chemical formula for iron (iii) oxide a. fe2o3 b. fe2o c. feo2 d. feo
a
what is the name of this compound: mgs a. magnesium sulfide b. magnesium sulfite c. magnesium sulfate d. magnesium monosulfite
a
whats the formula for the ionic compound composed of rubidium and oxygen a. rb2o b. rbo2 c. rb3o2 d. rb2o3
a
whats the formula for the ionic compound named lithium fluoride a. lif b. lif2 c. fli2 d. fli
a
how many moles are in 22.22 grams of dihydrogen monoxide (h2o) a. 2.334 mol b. 9.8847 mol c. 2.342 mol d. 1.234 mol
d
phosphorous has how many valence electrons a. 2 b. 3 c. 4 d. 5 e. none of the above
d
the noble gases do not form chemical bonds with other elements because: a. their atomic radius is too small b. their density is too low c. their electronegativity is too high d. they have a filled outer valence shell e. none of the above
d
what is the chemical formula for copper (ii) iodide a. cui3 b. cu2i c. cui d. cui2
d
what is the electron configuration for an element with atomic number 15 a. 1s2 2s2 2p6 3s2 3p5 b. 1s2 2s2 2p6 3s2 3p6 4s1 c. 1s2 2s2 2p6 3s2 3p4 d. 1s2 2s2 2p6 3s2 3p3
d
whats the formula for the ionic compound composed of aluminum and selenium a. al2se b. alse2 c. al3se2 d. al2se3
d
based on the following balanced equation: 3 h2(g) + n2(g) -> 2 nh3(g). how many moles of nitrogen gas react with 1.44 moles of hydrogen gas a. 0.480 b. 0.780 c. 0.680 d. 0.681
b
double bonded oxygen has a negative charge a. true b. false
b
groups are columns of elements, orders up and down on the periodic table, and represents different energy levels, n = 1, 2, 3 ... etc a. true b. false
b
if water evaporates into a gas from the liquid form, this represents a chemical change a. true b. false
b
the atomic number is the number of neutrons in the nucleus a. true b. false
b
the chemical formula for copper (ii) phosphates cu3(po4)2. what is the charge on each phosphate ion a. -4 b. -3 c. -2 d. -1
b
what element has this electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 a. bromine, br b. krypton, kr c. argon, ar d. rubidium, rb
b
what is the chemical formula for cobalt (iii) nitrate a. co2no3 b. co(no3)3 c. co(no3)2 d. co2(no3)3
b
what is the formula for aluminum hydroxide a. al(oh) b. al(oh)3 c. al(oh)2 d. al2(oh)3
b
what is the formula for potassium phosphate a. po2po4 b. k3po4 c. k2po4 d. po3po4
b
what is the name of this compound: kno2 a. potassium nitride b. potassium nitrite c. potassium nitroxide d. potassium nitrate
b
whats the formula for the ionic compound named beryllium fluoride? a. be2f b. bef2 c. bef d. bef3
b
a sample of uranium hexafluoride was recovered form the mining operation weighs 323.4 grams, how many molecules are present in the sample? a. 5.533 E^23 b. 4.352 E^23 c. 6.534 E^23 d. 6.764 E^23
c
how many grams are in 3.45 moles of carbon dioxide a. 201.9 g b. 100.91 g c. 151.8 g d. 96.3 g
c
sulfur has how many valence electrons a. 4 b. 5 c. 6 d. 7 e. none of the above
c
whats the formula for the ionic compound named barium nitride a. ba2n3 b. ban3 c. ba3n2 d. ba3n
c
calcium has how many valence electrons a. 4 b. 5 c. 6 d. 7 e. none of the above
e
carbon has how many valence electrons a. 1 b. 2 c. 3 d. 5 e. none of the above
e
chlorine has how many valence electrons a. 2 b. 3 c. 4 d. 5 e. none of the above
e