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+| |
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
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:
2- Which of the following is not a covalent compound
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
5- All of the following are Halogens except:
6- All of the following follow the octet rule except:
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...