Chemistry Project

Topics: Periodic table, Atom, Chemical element Pages: 5 (602 words) Published: May 18, 2013

Term Exam
Chemistry Project
Sunday, January 13, 2013


Question I: State whether each statement is true or false, then correct each incorrect statement. (7pts, 1 point each) 1- An Element is a substance that can be broken down into simpler substance by chemical means.

2- The Aufbau Principle states that energy levels must be filled from the highest to the lowest, when writing the election configuration.

3- Atomic radius decreases across a period and increases down a group.

4- Ionic compounds have low melting and boiling points.

5- Halogens are usually stored in oil to keep them from reacting with oxygen and water vapor.

6- The Duet rule states that elements will be stable with only 2 valence electrons.

7- Ionization Energy is the energy that is supplied to gain an electron.

Question II: Fill in the blank. (6pts, 1.5 points each)
1- , states that when the elements are arranged according to their atomic numbers, elements with the same properties appear at regular intervals.
2- The most common element in the universe is,

3- The common alloy Brass is made of and
4- An ion with a negative charge is call a,

Question III: Fill in the tables below: (14pts, 2 points each) Electron configuration Group# Period # Na| | | |
Al| | | |
S| | | |
N| | | |

Electron configuration P+| |
K+| |
Cl-| |

Question IV: Write the formula for the following compounds (8pts, 2 points each): 1- Sodium Oxide

2- IronII Oxide

3- Potassium Permanganate

4- Dinitrogen trioxide

Question V: Name the following compounds (8pts, 2 points each): 1- PH3

2- Na2O

3- ClO2-

4- Ca(NO3)2

Question VI: Draw the Lewis structure for each of the following (12pts, 4 points each) Sulfate



Question VII: (4 points) Explain why Alkali Metals are more likely to react with Halogens then Alkali Earth Metals are.

Question VIII (5 points): Calculate the moles of O atoms in 3.161 x 1023 molecules of CO2

Question IX (5 points): Calculate the mass of 0.14 Ions of NH4+

Question X (5 points): Calculate the moles of H atoms in 0.350 mole of C6H12O6

Question XI: Choose the best answer (16pts, 2 points each)

1- The formula for Hydronium:
a- OH-
b- H3O+
c- HO3
d- HN+

2- Which of the following is not a covalent compound
a- SCl2
b- CH2Cl2
c- HgSO4
d- None of the above

3- Most have a Crystal Lattice structure a- Ionic compounds
b- Polar covalent Compound
c- Non-Polar Covalent Compounds
d- Compounds that share elections

4- Consist(s) of 1 proton and 1 electron. a- Alkali Metals
b- Boron
c- Halogens
d- Hydrogen

5- All of the following are Halogens except:
a- Chlorine
b- Boron
c- Bromine
d- Iodine

6- All of the following follow the octet rule except:
a- Chlorine
b- Neon
c- Mercury
d- Boron

7- Electron Affinity:
a- Increases down a group
b- Decreases down a group
c- Decreases across a period
d- Does not change in either direction

8- The Statement that best describes Alkali Metals:
a- They are the most reactive nonmetals
b- They are found in nature as pure elements
c- Have only two valence electrons, which makes them very reactive d- They are soft and easily cut with a knife

Question XIII: In the Empty periodic table below fill in the following: (10pts, 2.5 each) 1- The first 20 Elements.
2- Identify the main group elements and...
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