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Mekhanik [1.2K]
3 years ago
7

Which reactions have a positive Δrxn? A(g)+B(g)⟶C(g) 2A(g)+2B(g)⟶5C(g) A(s)+B(s)⟶C(g) 2A(g)+2B(g)⟶3C(g)

Chemistry
1 answer:
Sidana [21]3 years ago
4 0

Answer:

A(g)+B(g)⟶C(g) 2A(g)+2B(g)⟶5C(g)

A(s)+B(s)⟶C(g) 2A(g)+2B(g)⟶3C(g):

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6. What is true about Calcium (Ca)?
sasho [114]

Answer:

C. naturally uncombined with other elements.

Explanation: Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air.

8 0
3 years ago
on dr v’s bookshelf there are 23 science textbooks each with an average of 31 chapters of each chapter contains 5 pages how many
olga55 [171]

Answer:

There are 3600 pages to 2 significant figures

Explanation:

Working only with the information given, we have that there are 23 books each with about 31 chapters.

This means that if 1 book has 31 chapter, the 23 science books will have

31 X 23 chapters =713 chapters in total.

If each chapter contains 5 pages, for the 713 chapters we will have a total of 713 X 5 pages = 3565 pages.

Rounding off the answer to 2 significant figures , we are looking to have only two non-zero figures in our answer. To do this, we count two numbers from the left. This will be numbers 3 and 5.

Next,  we check the net number after 5 to see if it is greater than 5 if it is, we will have to add the number (1 ) to the 5. This shows that we are approximating upwards, to account for the fact that that number has passed the middle point.

After this, we change the remaining two numbers (6 and 5) to zeroes.

This will give us 3600 pages.

8 0
3 years ago
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Lady bird [3.3K]

Answer:

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Explanation:

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5 0
3 years ago
Noble gas compounds like KrF, XeCl, and XeBr are used in excimer lasers. Draw an approximate molecular orbital diagram appropria
Aneli [31]

Answer:

Here's what I get.

Explanation:

The MO diagrams of KrBr, XeCl, and XeBr are shown below.

They are similar, except for the numbering of the valence shell orbitals.

Also, I have drawn the s and p orbitals at the same energy levels for both atoms in the compounds. That is obviously not the case.

However, the MO diagrams are approximately correct.

The ground state electron configuration of KrF is

(1\sigma_{g})^{2}\, (1\sigma_{u}^{*})^{2} \, (2\sigma_{g})^{2} \, (2\sigma_{u}^{*})^{2} \, (3\sigma_{g})^{2} \,  (1\pi_{u})^{4} \, (1\pi_{g}^{*})^{4} \, (3\sigma_{g}^{*})^{1}

KrF⁺ will have one less electron than KrF.

You remove the antibonding electron from the highest energy orbital, so the bond order increases.

The KrF bond will be stronger.

6 0
4 years ago
How many atoms of Hydrogen are in 67.2 L of H2 at STP?​
nekit [7.7K]

Answer:

this answer is hard cant answer

5 0
3 years ago
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