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REVIEW ACS VI

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Question 1

Which of these elements is predicted to be the most active metal?

Select one:
 Correct

 

Explanation

 The element with smallest electronegativity is most active because it is located group 1A (most reactive metals)

 

Question 2

Which of these elements is predicted to be the most active nonmetal?

Select one:
 Correct

 

Explanation

 The element with largest electronegativity is the most reactive nonmetal. 

 

Question 3

When C30H50O2 is completely oxidized with excess oxygen, what are the products?

Select one:
 Correct

 

Explanation

This is a combustion reaction so the products are always going to H2O and CO2.

 

Question 4

In what part of the periodic table are the largest electronegativities found?

Select one:
 Correct

 

Explanation

electronegativity - the ability of an atom to gain an electron

 

Question 5

In what part of the periodic table are the smallest ionization energies for the first electron found?

Select one:
 Correct

 

Explanation

Ionization - the energy required to lose an electron

 

 

Question 6

Arrange the elements Li, Be, Ne, and Ar in increasing order of the energy required to remove an electron from their respective gaseous atoms
.
Select one:
 Correct

 

Explanation

Ionization - the energy required to lose an electron

 

Question 7

The first four ionization energies of an element X are 0.58, 1.82, 2.74, and 11.58 MJ/mol. What is the most likely formula for a stable ion of X?
Select one:
 Correct

 

Explanation

 After removing 3 valence electrons the the fourth ionization energy is really large due to the removal of a core electron. Therefore, the stable form is X3+

 

Question 8

Which statement is correct concerning noble gases?

Select one:
 Correct

 

Explanation

Noble gases are normally in a gas state at room temperature. Other elements become negative or positive charged to become like noble gases. Noble gases were once inert. 

 

Question 9

If the formula of an oxide of element X is XO, what is the formula of the chloride of X?

Select one:
 Correct

 

Explanation

 Oxyen is -2, which means X is +2. 


Cl : -1


Cross the charges to get:  

 

Question 10

If the formula of an oxide of element X is XO, what is the formula of the nitride of X?

Select one:
 Correct

 

Explanation

 Oxyen is -2, which means X is +2. 

N : -3

Cross the charges to get: X3N2

 

Question 11

If silicon, atomic number 14, combines with chlorine, atomic number 17 what is the most likely formula based on your knowledge of the periodic nature of the elements?

Select one:
 Correct

 

Explanation

 Si : -4

Cl: -1


Cross the charges to get :  SiCl4

 

Question 12

When the three elements P, Cl, and As are arranged in order of increasing atomic radius, which is the correct order?

Select one:
 Correct

 

Explanation

 

 

Question 13

When the three elements Na, Al, and K are arranged in order of increasing atomic radius, which is the correct order?

Select one:
 Correct

 

Explanation

 

 

Question 14

When the three ions N3-, O2-, and F- are arranged in order of increasing ionic radius, which is the correct order?

Select one:
 Correct

 

Explanation

 protons electrons size
 F- 9 10 small (strong  attraction to nucleus)
O2- 8 10 medium (medium attraction to nucleus)
N3- 7 10 large ( weak attraction to nucleus)

 

 

Question 15

When the three ions Na+, Mg+, and Mg2+ are arranged in order of increasing ionic radius, which is the correct order? (This one is tricky. Hint, do you think the one with a 3s electron is larger than those without any 3s electrons?)

Select one:
 Correct

 

Explanation


 protons electrons size
Mg2+12 10 small (strong  attraction to nucleus)
 Na+11 10 medium (medium attraction to nucleus)
Mg+ 1211 large ( weak attraction to nucleus)
 

Question 16

In what part of the periodic table are the largest atoms found?

Select one:
 Correct

 

Explanation

 

 

Question 17

Which is a characteristic property of transition elements?

Select one:
 Correct

 

Explanation

 Oxidation for transition metal are lastly determined, therefore their oxidation number is varies

 

Question 18

Check the pair of species where the first member is smaller in diameter than the second member.

Select one:
 Correct

 

Explanation

 has more electrons than protons so it is larger in size than F.

 

Question 19

Which gas is LEAST soluble in water?

Select one:
 Correct

 

Explanation

 CH4 Lewis structure is a tetrahedral which is nonpolar. Water is polar so CH4 will not dissolve because like dissolves like. (nonpolar with nonpolar) (polar with polar)

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