Chem Lesson 3.2b Hw
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Which Lewis electron-dot structure is drawn correctly for the atom it represents?
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These questions deal with ionic compounds.
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- 2.
An ionic compound is formed when there is a reaction between the elements
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Strontium and chlorine
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Hydrogen and chlorine
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Nitrogen and oxygen
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Sulfur and oxygen
Correct Answer
A. Strontium and chlorineExplanation
Strontium loses electrons and chlorine gains electrons.
The electronegativity difference is 2.2, which makes it IONIC.Rate this question:
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- 3.
The compound XCl is classified as ionic if X represents the element
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H
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I
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Rb
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Br
Correct Answer
A. RbExplanation
RbCl has an electronegativity difference of 2.4, which makes it IONIC.Rate this question:
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- 4.
Which type of bond is formed when electrons are transferred from one atom to another?
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Covalent
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Hydrogen
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Metallic
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Ionic
Correct Answer
A. IonicExplanation
The only type of bond we have talked about so far is IONIC. Besides, the metals lose their electrons to nonmetals, which is what happens during ionic bond formation.Rate this question:
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- 5.
Which element forms an ionic compound when it reacts with lithium?
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K
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Fe
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Kr
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Br
Correct Answer
A. BrExplanation
Bromine (Br) forms an ionic compound when it reacts with lithium. This is because bromine is a halogen and has a tendency to gain one electron to achieve a stable octet configuration. Lithium, on the other hand, has a tendency to lose one electron. Therefore, when lithium reacts with bromine, lithium loses one electron and bromine gains one electron, resulting in the formation of an ionic compound.Rate this question:
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- 6.
The bonds in BaO are best described as
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Covalent, because valence electrons are shared
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Covalent, because valence electrons are transferred
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Ionic, because valence electrons are shared
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Ionic, because valence electrons are transferred
Correct Answer
A. Ionic, because valence electrons are transferredExplanation
Ionic bonds involve transferring electrons. BaO is ionic.Rate this question:
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- 7.
Explain, in terms of electrons, why the bonding in NaCl is ionic. [1]
Correct Answer
electrons are transferred
electrons transferred
electron is transferred
electron transferredExplanation
The valence electron from Na is transferred to Cl.Rate this question:
- 8.
Identify the element in Period 3 of the Periodic Table that reacts with oxygen to form an ionic compound represented by the formula X2O. [1]
Correct Answer
Na
sodiumExplanation
sodium is the only Period 3 element that has 1 valence electron. Oxide ions have a charge of -2, which is balanced by 2 X ions, each with a +1 charge.Rate this question:
- 9.
Explain, in terms of electrons, why the ionic radius of a Group 2 element is smaller than its atomic radius. [1]
Correct Answer
fewer electron orbitals
lost valence electrons
fewer valence electrons
more protons than electrons
lost an electron orbital fewer electrons
less electrons
fewer electronsExplanation
The ionic radius of a Group 2 element is smaller than its atomic radius because it loses valence electrons. When a Group 2 element forms an ion, it loses two valence electrons, resulting in a decrease in the electron cloud surrounding the nucleus. This loss of electrons reduces the size of the ion compared to the neutral atom, leading to a smaller ionic radius. Additionally, the ion has more protons than electrons, which further contributes to the reduction in size. The terms "fewer electron orbitals," "lost valence electrons," "fewer valence electrons," "more protons than electrons," and "lost an electron orbital" all explain why the ionic radius is smaller. The terms "fewer electrons" and "less electrons" also imply the loss of valence electrons.Rate this question:
- 10.
Write the formula for strontium chloride
Correct Answer
SrCl2Explanation
Strontium has a +2 charge and chlorine is -1. You need 2 chloride ions to balance the 1 strontium.Rate this question:
- 11.
What is the name of Li2O? (MUST BE SPELLED CORRECTLY)
Correct Answer
lithium oxideExplanation
Lithium + oxygen = lithium oxide.Rate this question:
- 12.
What is the formula for cesium sulfide?
Correct Answer
Cs2SExplanation
Cesium is +1. Sulfur is -2. 2 cesiums for every 1 sulfur.Rate this question:
- 13.
What is the name of BeO?
Correct Answer
beryllium oxideExplanation
metal doesn't change the name. if it's a nonmetal element, it becomes -ide, as in OXIDE.Rate this question:
- 14.
What is the formula of magnesium iodide?
Correct Answer
MgI2Explanation
Magnesium is +2. iodine is -1. You need 2 iodides to balance out 1 magnesium.Rate this question:
- 15.
What is the formula of aluminum oxide?
Correct Answer
Al2O3Explanation
Aluminum is +3 charge. Oxygen is -2 charge. If they both totaled 6, they could balance each other. 2 aluminums (at +3 each) total +6. 3 oxides (at -2 each) total -6. BOOM!! BALANCED!!Rate this question:
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Oct 23, 2011Quiz Created by
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