CHEMISTRY HIGH SCHOOL

Of these nonmetals, which one is likely to be the least reactive?A. nitrogen (N)
B. phosphorous (P)
C. sulfur (S)
D. oxygen (O)

Answers

Answer 1
Answer:

Answer: Phosphorous

Explanation: Nitrogen(N): 7: 1s^22s^22p^3

Phosphorus(P): 15:1s^22s^22p^63s^23p^3

Oxygen(O): 8:1s^22s^22p^4

Sulphur(S): 16:1s^22s^22p^63s^23p^4

As nitrogen contains half filled configuration, it is stable and does not react. Phosphorous lies below nitrogen and reactivity decreases down a group for non metals as they tend to gain electrons as the valence shell move away from the nucleus.

Oxygen has 4 valence electrons, thus it need to gain two electrons to attain stable configuration. Thus is reactive.

Sulphur lies below oxygen and also need to gain two electrons. Reactivity decreases down a group for non metals as they tend to gain electrons as the valence shell move away from the nucleus.
Answer 2
Answer: Reactivity increases upward and decreases leftward for these nonmetals. Thus oxygen would be the most reactive since it is the most rightward and upward.

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What is the total number of electrons in the valence shell of an atom of aluminum in the ground state?(1) 8 (3) 3
(2) 2 (4) 10

Answers

The answer is (3) 3. The outer shell of an atom is called valence shell. And the ground state is the lowest energy state of an atom. Aluminum has a electron distribution of 2, 8, 3. So the outer shell has 3 electrons.

Answer:

C. 3

Explanation:

If you look at aluminum (Al) in the Periodic Table of the Elements, you will see that its electron configuration is 2-8-3.  The last number indicates the valence shell, which contains three electrons.

How many grams are in 4.5 moles of Li2O?

Answers

ur answer is 134.1 grams  

During an experiment, Mr. Lehman tells his students to be alert for signs that an endothermic reaction is happening. Which of the following scenarios would his students most likely observe?

Answers

The correct answer for the question that is being presented above is this one: "A test tube becomes cool to the touch." During an experiment, Mr. Lehman tells his students to be alert for signs that an endothermic reaction is happening. The student will most likely observed that the test tube becomes cool to the touch.

Answer:

these are the choices

Explanation:

1 A test tube becomes cool to the touch.

2 A liquid appears to glow.

3 A new odor comes from a beaker.

4 A solid forms from a mixture of solutions.

What two things determine whether a molecule is polar?Check all that apply. A.The size of the atoms that make up the molecule B.Whether or not there are bonds of two atoms of unequal electronegativity C.Whether there is a double bond D.The shape of the molecule

Answers

its B and C 
if ur looking for 2 options 

Answer:B & D

Explanation:

Why aliminium is use in manufacturing aeroplanes
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Answers

Answer: Aluminum is ideal for aircraft manufacture because it's lightweight and strong.

Explanation:

Which substance below will exhibit hydrogen bonding between the molecules of the substance? a. CH₄
b. HBr
c. HCl
d. H₂O
e. H₂

Answers

I think it might just might be e
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