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sergij07 [2.7K]
3 years ago
6

Please helpp me i really need help​

Chemistry
2 answers:
Monica [59]3 years ago
6 0
5 minutes. 2 degree change
10 minutes. 5 degree change
20 minutes. 8 degree change
vagabundo [1.1K]3 years ago
4 0

Answer:

second box is 2 C, third box is 3 C, and the last box is 3 C.

Explanation:

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Which is easier to remove: a valence electron from, Li or Na? Explain why.
scZoUnD [109]

The atomic number of Li is 3

Electron configuration of Li : 1s² 2s¹

The atomic number of Na is 11

Electron configuration of Na : 1s²2s²2p⁶3s¹

Thus there is one electron in the valence shell of Li (2s¹) and that of Na (3s¹). However, the valence electron in Na is in a shell that is farther away from the nucleus compared to that of Li. As a result, the Na valence electron will be held less tightly by the nucleus i.e. it will experience a reduced nuclear attraction and can be removed easily than the Li 2s electron.

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3 years ago
In the reaction 3H2 + N2 → ____ NH3, what coefficient should be placed in front of NH3 to balance the reaction?
zubka84 [21]
2. 3H2 + N2 means you have 6 Hs and 2 Ns. NH3 has one N and 3 Hs, so you need 2 NH3s in order to have the 2 and 6 of each that you need on both sides of the reaction.
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3 years ago
Ions can have a positive or negative charge. false or true
Fudgin [204]
True. Ions can have a positive or negative charge.
7 0
3 years ago
Read 2 more answers
How many electrons are in p orbitals in Si (Silicon)?
insens350 [35]

Answer:

6 electrons

Explanation:

The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the next two electrons in the 3s.

8 0
3 years ago
The gas that makes up about 12 percent of the earths atmosphere is ?
ElenaW [278]

Answer:

You may be referring to the gas that makes up 21% of the earth's atmosphere, which is oxygen.

Explanation:

According to NASA, the gases in Earth's atmosphere include:

Nitrogen — 78 percent

Oxygen — 21 percent

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Carbon dioxide — 0.04 percent

(Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor)

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