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WorksheetsWCOA Chem. B (2nd Sem.) Module 3 Exam Review-part 1 Quizizz
Total questions: 10
Worksheet time: 8mins
14.... 3-
N
7......
How many protons, neutrons and electrons?
14 protons, 7 neutrons, 7 electrons
7 protons, 7 neutrons, 10 electrons
7 protons, 14 neutrons, 3 electrons
7 protons, 7 neutrons, 4 electrons
Which of the following elements would you expect to lose electrons to "get to 8"? Select all that apply.
Magnesium, because it is a metal. (left side of periodic table)
Fluorine, because it is a non-metal. (right side of periodic table)
Lithium, because it is a metal. (left side of periodic table)
Nitrogen, because it is a non-metal. (right side of periodic table)
The balanced equation for reaction of barium (Ba) with atmospheric oxygen (O2) is
Ba + O2 --> BaO2
2Ba + O2 --> 2BaO2
2Ba + O2 --> 2BaO
2Ba + O2 --> Ba2O2
How do covalent compounds differ from ionic compounds? (Check all that apply.)
Covalent compounds share electrons to form bonds, while ionic compounds transfer electrons to form bonds.
Covalent compounds always have a metal in them, while ionic compounds don't have metals in them.
Covalent compounds want to "get to 8", while ionic compounds want to "get to 6".
Covalent compounds form between two or more non-metals, while ionic bonds form between metals and non-metals.
The overall charge on the compound sodium cyanide (NaCN) is___ because___
+1...Na has a charge of +2 and CN has a charge of -1.
0...the charges on the ions in an ionic compounds must be equal and opposite: Na+1 and CN-1.
0...all covalent compounds have a charge of 0.
-1...all ionic compounds have a minus charge.
The formula for potassium nitride is
KN3
KN
K3N3
K3N
How do ionic compounds, like strontium oxide, form?
Strontium, being a metal in group 1, loses 1 electron to get to 8 valence electrons. Oxygen, being a non-metal in group 16, gains 2 electrons to get to 8. Two strontium atoms each transfer 1 electron to the oxygen atom. The strontium cations are attracted to the oxide anion forming Sr2O.
Two strontium atoms share electrons with an oxygen atom, forming SrO.
Two strontium atoms gain 1 electron each from the oxygen, which losses 2 electrons.
Ionic compounds don't really form. It is just a way to picture subatomic interactions.
What is the name for CaF2?
calcium (II) fluoride
calcium fluoride
monocalcium difluoride
calcium difluoride
What is the formula for lead (II) phosphate?
PbPO4
Pb2(PO4)3
Pb2PO4
Pb3(PO4)2
Check all of the correct statements about charges on ions.
bromide has a -1 charge, since it is in group 17 (7 valence electrons) and gains 1 negative electron to satisfy the octet rule.
aluminum ions have a +3 charge, since Al is in group 13 (3 valence electrons) and loses 3 negative electrons to satisfy the octet rule.
oxygen has a +6 charge, since it is in group 16 (6 valence electrons) and loses 6 negative electrons to satisfy the octet rule.
nitride has a -1 charge since it is in group 15 (15 valence electrons) and gains 1 negative electron to satisfy the octet rule.
