Worksheet

Name: ______

Class : 11 _____

Day/date: ______

MADANIA (Highschool)

Grade 11ChemistryWorksheet 2.3

A Review on Atomic Structure & Chemical bonding and Structure

27 / 8 / 2010

Answer these questions.

PART A – MULTIPLE CHOICES

  1. Which of the following electron configurations is correct for Chromium, Cr?

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  1. [Ar] 4s2 3d5
  2. [Ne] 4s2 3d4
  3. [Ar] 4s2 4p4
  4. [Ne] 4s2 3d5
  5. [Ar] 4s1 3d5

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  1. How many electrons in manganese atom, Mg, place in m = -1 and s = + ½

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  1. 0
  2. 1
  3. 2
  4. 3
  5. 4

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  1. The diagram shows the structure of methane.

What is the total number of electrons used for bonding in this molecule?

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  1. 1
  2. 2
  3. 4
  4. 8
  5. 10

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  1. The NH4+ion is widely used in the synthesis of organic compounds.What is the pattern of electron pairs in this ion?

Bonding pairs of electrons / Lone pairs of electron
a / 2 / 0
b / 4 / 2
c / 4 / 0
d / 3 / 1
  1. The diagram shows an outline of part of the Periodic Table.

Which two elements could form a covalent compound?

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  1. W and X
  2. W and Y
  3. X and Y
  4. X and Z
  5. Y and Z

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  1. A molten compound is electrolyzed. Two atoms of X are deposited at the negative electrode atthe same time as three atoms of Y are deposited at the positive electrode.

These results show that:

X is a …1…;Y is a …2…;the formula of the compound is …3… .

How are gaps 1, 2 and 3 correctly completed?

1 / 2 / 3
a / metal / Non-metal / X3Y2
b / metal / Non-metal / X2Y3
c / Non-metal / Metal / X3Y2
d / Non-metal / Metal / X2Y3
e / Non-metal / Non-metal / X2Y3
  1. The following statement is about chemical bonds.

Covalent bonds are formed by the …1… of electrons.

Covalent substances have …2…electrical conductivity.

Which words complete the statement?

1 / 2
a / sharing / High
b / sharing / Low
c / Transfer / High
d / Transfer / Low
  1. In forming ionic compounds, elements generally form an ion with the electronic structure of anoble gas.Which ion does not have a noble gas electronic structure?

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  1. I–
  2. Rb+
  3. Sn2+
  4. Sr2+

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  1. The table describes the structures of four particles.

Particle / Number of protons / Number of neutrons / Number of electrons
O / 8 / 8 / 8
O2- / 8 / 8 / X
Na / 11 / Y / 11
Na+ / 11 / 12 / Z

What are the correct values for X, Y and Z?

X / Y / Z
a / 9 / 11 / 10
b / 9 / 11 / 11
c / 10 / 12 / 10
d / 10 / 12 / 11
e / 10 / 11 / 11
  1. When barium metal burns in oxygen, the ionic compound barium peroxide, BaO2, is formed.Which dot-and-cross diagram represents the electronic structure of the peroxide anion in BaO2?

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  1. The diagrams show the possible paths of subatomic particles moving in an electric field in a vacuum.

Which diagrams are correct?

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  1. 1 and 2 only
  2. 1 and 3 only
  3. 2 and 3 only
  4. 1, 2 and 3
  5. None of the above

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  1. The graph shows the first thirteen ionisation energies for element X.

What can be deduced about element X from the graph?

  1. It is in the second period (Li to Ne) of the Periodic Table.
  2. It is a d-block element.
  3. It is in Group II of the Periodic Table.
  4. It is in Group III of the Periodic Table.
  1. The coordinate (dative covalent) bond in the molecule below is shows by number….

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  1. 1
  2. 2
  3. 3
  4. 4

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  1. The sketch graph shows the variation of one physical or chemical property with another for theGroup II elements.

What are the correct labels for the axes?

x / y
a / Atomic number / Mass number
b / Atomic number / Melting point
c / 1st ionization energy / Atomic number
d / 1st Ionization energy / Atomic radius
e / 1st Ionization Energy / Mass number

PART B – STRUCTURED QUESTIONS

  1. Magnesium reacts with bromine to form magnesium bromide.
  1. What kind of compound that is produced (ionic, covalent or metallic)? ____
  1. What kind of force that form between the atoms? ______
  1. Draw the diagram that shows the formula of the compound. Use cross (x) to represent electrons of magnesium and dot (o) to represent electrons of bromine.
  1. Xenon is a colorless, heavy, odorless noble gas, xenon occurs in the Earth's atmosphere in trace amounts. Although generally un-reactive, xenon can undergo a few chemical reactions such as the formation of xenon hexafluoroplatinate, the first noble gas compound to be synthesized.
  1. An isotope of Xenon has a mass number of 136. Determine the number of electron, proton and neutron in this isotope of xenon.
  1. Another example of xenon compound that have been made is xenon difluoride, XeF2.
  2. Determine the shape of the molecule and its polarity.
  1. What in the strongest intermolecular force that might appear in XeF2?

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