Chemistry, 17.05.2021 14:30 sardarp1irc5

How long would it take a train to travel 500 miles at 25 mph?

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Answer from: hjgdk6891

2 or 3 hrs

I think

HOPE IT HELPED

Answer from: avaleasim

The rate of speed you're doing is 250 miles every hour. So in 1 hour you will travel 250 miles, and in 2 hours you will travel 2(250) = 500 miles. So it will take you 2 hours to travel 500 miles if you're going 250 mph. :)

The famous equation to remember here is d = st where d = distance, and s = speed and t = time. So if you put 500 for d and 250 for s, you are just solving for t which in this case is hours. 500 = 250t.

Hope that helps!

Answer from: Quest

it would be d. henry moseley

hope this !

and sorry if i'm late. have a good rest of your day! : d

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

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