CHEMISTRY HIGH SCHOOL

Based on its location in the periodic table, what can most likely be predicted about phosphorus?It has three valence electrons available for bonding.
It has three nonbonding electrons.
It has five valence electrons available for bonding.
It has five nonbonding electrons.

Answers

Answer 1
Answer: It has 5 valence electrons available for bonding.  The noble gas configuration of phosphorus is [Ne]3s²3p³ showing that phosphorus has 5 valence electrons (2 in the s orbital and 3 in the p orbital).
I hope this helps.  Let me know in the comments if anything is unclear.
Answer 2
Answer:

Answer:The answer is "It has five valence electrons available for bonding". An element's group number is equivalent to the number of valence electrons that it has. This means that since phosphorus is found on group number 5, it has 5 valence electrons that participate in bonding. It also means that it needs 3 more electrons to complete its valency.

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Which solution has the highest boiling point at standard pressure?(1) 0.10 M KCl(aq)
(2) 0.10 M K2SO4(aq)
(3) 0.10 M K3PO4(aq)
(4) 0.10 M KNO3(aq)

Answers

The correct answer is 3: 0.10 M K3PO4(aq). The higher the concentration (or molarity), the higher the boiling point. Thus, the solution with the most moles will have the highest boiling point. SO4, PO4, and NO3 are all polyatomic ions, so by definition, they only have one mole. In K3PO4, K3 has 3 moles and PO4 has 1 mole, meaning all together it has 4 moles (more than any of the other options).

How would the equilibrium change if NO2 were added to SO2(g) + NO2(g) NO(g) + SO3(g) + heat?A. The equilibrium constant would increase.
B. The amount of NO and SO3 would decrease.
C. The amount of NO and SO3 would increase.
D. The amount of NO2 and SO2 would increase.

Answers

The answer to this question would be that the amount of No and SO3 would increase. The correct choice is C. 

The equilibrium of this chemical reaction would change if NO₂ were added because: C. the amount of NO and SO₃ would increase.

What is an equilibrium?

An equilibrium can be defined as a condition in which there is no net change in the amounts of both reactants and products with respect to time, during a reversible chemical reaction.

This ultimately implies that, the rate of the forwardchemical reaction is equal to the rate of the backwardchemical reaction at equilibrium.

In this context, we can infer and logically conclude that the equilibrium of this chemical reaction would change when NO₂ is added because the amount of NO and SO₃ would increase:

                      SO₂(g) + NO₂(g) ⇆ NO(g) + SO₃(g) + heat

Read more on equilibrium here: brainly.com/question/5081082

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Which of the answer choices accurately describes a trend that occurs when moving left to right across periods?(Select all that apply.)

reactivity increases
atomic radius increases
atomic mass increases
valence electrons decrease

Answers

atomic radius is the correct answer

The symbol for the metric unit used to measure mass is?​

Answers

Answer: Kilograms (kg)

Explanation:

Answer:

(g)

Explanation:

(g) is the symbol of a gram which is the metric unit that measures mass.

Hope that helps!

Each sheet of metal on a roof is parallel to the rest of the sheets of metal. If the first sheet of metal is perpendicular to the top line of the roof, what can you conclude about the rest of sheets of metal? Justify your answer.a. The sheets of metal are all perpendicular to the top line of the roof by the Alternate Interior Angles Theorem.
b. The sheets of metal are all perpendicular to the top line of the roof by the Transitive Property of Parallel Lines.
c. The sheets of metal are all perpendicular to the top line of the roof by the Converse of the Same-Side Interior Angles Theorem.

Answers

B.

Because all of the lines are parallel, and the top line is perpendicular to them, all of the lines are perpendicular to the top line due to the transitive property of parallel lines.

Answer:

b. The sheets of metal are all perpendicular to the top line of the roof by the Transitive Property of Parallel Lines.

1. A sample of nitrogen occupies a volume of 250 mLat 298 K. What volume will it occupy at 268 K?

Answers

Answer:

0.225 L = 225 mL

Explanation:

Charles' Law states that for a fixed pressure, the volume is directly proportional to the temperature, which means things expand at the same rate as the rate of it being heated up

Mathematically, we can write that as:

V1/T1 = V2/T2, where 1 and 2 are the two situations

So, when we substitute the values in, we get:

0.25 L/298 K = V2/268 K

Rearranging this, we get:

(0.25/298) x 268 = 0.225 L = 225 mL.

This also makes sense, as the volume reduced a little when the temperature reduced (cooled down)

Let me know if this makes sense, and hope I helped! :)
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