1. How many neutrons in the element depicted above? Answer: 2. Choose the correc

Question

1.    How many neutrons in the element depicted above?

Answer:

2.    Choose the correct value for the total number of molecules in 5 g of sodium carbonate.

Choose one answer.

A. 7.26 x 10^22

B. 3.63 x 10^22

C. 6.02 x 10^23

D. 82.99

3.    1s2 2s2 2p6 3s2 3p6 4s1 3d5

How many valence shell electrons are in this element?

Choose one answer.

A. 1

B. 11

C. 5

D. 6

4.    Identify the following compounds as either ionic, covalent or polar.

Potassium nitrate

Choose...ionicpolarcovalent

Methane CH4

Choose...ionicpolarcovalent

Barium chloride

Choose...ionicpolarcovalent

Perchloric acid

Choose...ionicpolarcovalent

Water

Choose...ionicpolarcovalent

Hydroxyl (-OH)

Choose...ionicpolarcovalent

Iron (II) oxide

Choose...ionicpolarcovalent

5.    In order for elements to covalently bind, atoms must have _____ electrons available to form the compound.

Choose...octet ruleisotopesvalencepolar

Nobel gases follow the _____ ______ that every molecule or compound seeks to achieve in a chemical reaction.

Choose...octet ruleisotopesvalencepolar

Ice floats on water because of water's _____ nature.

Choose...octet ruleisotopesvalencepolar

Naturally occuring and man made _____ contribute to the variety of elements and the average masses.

Choose...octet ruleisotopesvalencepolar

6.    Magnesium is present in magnesium sulfate at what percent?

Choose one answer.

A. 26.6

B. 53.1%

C. 20.2%

D. 12.038%

7.    Antimony (Sb) consists of two isotopes, 123Sb and 121Sb. The atomic mass percent of 121Sb is 1.1%. What is the atomic mass of 123Sb if the overall atomic mass is 121.76 ?

Choose one answer.

A. 100

B. 13.4

C. 120.4

D. 97.9

E. 121.75

8.    1s2 2s2 2p6 3s2 3p6 4s1 3d5

The configuration above is that of the element________ .

Answer:

A. 7.26 x 10^22

B. 3.63 x 10^22

C. 6.02 x 10^23

D. 82.99

Explanation / Answer

)48-24 =24 (neutrons)
2)106gm of Na2CO3 contains 6.023*10^23 molecules
5 gm of Na2CO3 contains .............?
   = 2.84 *10^22 molecules
3)D. 6

4)
Potassium nitrate... ionic
   

   

Methane CH4..covalent
   

   

Barium chloride.... ionic
   

   

Perchloric acid.... polar
   

   

Water....polar
   

   

Hydroxyl (-OH)....ionic
   

   

Iron (II) oxide ...covalent



5) valence
   Octet
    polar
   isotopes

6)Mg......20.2%
S.......26.66%
   O ......53.1%

7) E. 121.75
8)Cr

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.