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jeyben [28]
3 years ago
9

30 POINTS!!!!!! PLEASE HURRY!!!! Four boxes of increasing size and weight must be pushed up a ramp. To push the boxes at the sam

e speed, what must you do? A) Push the boxes with the same force, smoothly up the ramp.. B) The larger and heavier the box, the more force you must use when pushing. C) Push the boxes with the same force, at exactly the same speed, up the ramp. D) Push the largest box with the most force; push the others with about the same force.
Chemistry
2 answers:
Verdich [7]3 years ago
8 0

Answer:

The larger and heavier the box, the more force you must use when pushing.

Explanation:

faust18 [17]3 years ago
7 0

The larger and heavier the box, the more force you must use when pushing.

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To calculate the average mass of the element, we take the summation of the product of the isotope and the percent abundance. In this case, it is 0.935 * 268.9 amu + 0.065* 269.9 amu. This is equal to an average mass of 268.965 amu.
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3 years ago
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Find the mass of 1.59 mol of NH3.<br> Please show the work if you can!
Law Incorporation [45]

Answer:

25.4/km=3

Explanation:

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2 years ago
Which of the following is a reasonable ground-state electron configuration?A) 1s21p62d2B) 1s22s42p6C) 1s22s22p5D) 1s22s22d6
Semenov [28]

Answer:

  • <u><em>Option C) 1s² 2s² 2p⁵</em></u>

Explanation:

<em>Ground-state</em> is the configuration of the electrons when every electron of the atom occupies the lowest possible energy level.

The rank of energy of the orbitals may be remembered using Aufbau rules, and it is:

1s² < 2s² < 2p⁶ < 3s² < 3p⁶ < 4s² < 3d¹⁰ < 4p⁶ < 5s² < 4d¹⁰ < 5p⁶ < 6s² < 4f¹⁴ < 5d¹⁰ < 6p⁶ < 7s² < 5f¹⁴ < 6d¹⁰ < 7p⁶

Then, to find whether an electron configuration corresponds to a ground-state one, you must check that the previous order is preserved.

<u>Option A). 1s² 1p⁶ 2d²</u>

The orbital 1p does not exist. So this one is discarded.

<u>Option B) 1s² 2s⁴ 2p⁶</u>

The maximum number of electrons in an s orbital is 2, so 2s⁴ is impossible, and this option is discarded.

<u>Option C) 1s² 2s² 2p⁵</u>

This is correct because the orbitals are filled in the correct increasing energy order, without jumping any one.

<u>Option D) 1s² 2s² 2d⁶</u>

Orbital 2d does not exist, so this option is also discarded.

4 0
3 years ago
You need 4.0 ounces of a steroid ointment. if there are 16 oz in 1 lb, how many grams of ointment does the pharmacist need to pr
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The given units are the units of masses which are interconvertable.

It is given that:

1 lb = 16 oz

Now, converting kg to lb:

Since, 1 kg = 2.20462 lb

So, \frac{0.0625 lb}{1 oz}\times \frac{1 kg}{2.20462 lb}

Now converting kg to g:

Since, 1 kg = 1000 g

So, \frac{0.0625 lb}{1 oz}\times \frac{1 kg}{2.20462 lb}\times \frac{1000 g}{1 kg} = 28.349 \frac{g}{oz}

For 4 oz:

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6 0
3 years ago
Question 1. Considering the reaction of the decomposition of N2O5 to form the products NO2 and O2, calculate the average reactio
GalinKa [24]
<span>
 </span><span> average reaction rate </span><span>= change in concentration / change in time
by putting values we have

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this is our conclusion
hope this helps</span>
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3 years ago
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