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3 years ago

What is light

Chemistry

1 answer:

grin007 [14]3 years ago

4 0

Answer:

light energy is a form of electromagnetic radiations of a wavelength, which can be seen by the human eye.

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Gather data: Four other pairs of elements in the same chemical family are listed below. List the number of valence electrons in

Iteru [2.4K]

Explanation:

Valence electrons is the number of electrons in the outermost shell of an atom. For the main group elements, the group number represents the number of valence electrons.

Beryllium

This belongs to the group 2 hence, it has valency of 2.

Nitrogen

This belongs to group 5, hence it has valency of 5.

Oxygen

This belongs to group 6, hence it has valency of 6.

Fluorine

This belongs to group 7, hence it has valency of 7.

Magnesium

This belongs to group 2, hence it has valency of 2.

Phosphorus

This belongs to group 5, hence it has valency of 5

Sulphur

This belongs to group 6, it has valency of 6

Chlorine

This belongs to group 7, it has valency of 7

6 0

3 years ago

Read 2 more answers

What is the ph of ammonium hydroxide?

marusya05 [52]

Ammonium Hydroxide is basic. At concentration of 1 mM it has a pH of 10.09. At concentration of 10 mM is has a pH of 10.61. At concentration of 100 mM it has a pH of 11.12. Hope that helps somewhat

8 0

3 years ago

Eriq, a chemist, is running tests with four unknown elements. He has found that they all bond the same way, so he knows that the

Reil [10]

Answer:

in group 17

Explanation:

just took the quiz

4 0

3 years ago

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Zinc is used as a coating for steel to protect the steel from environmental corrosion. If a piece of steel is submerged in an el

sweet [91]

Answer:

A) 3.17 g of Zn

Explanation:

Let's consider the reduction of Zn(II) that occurs in an electrolysis bath.

Zn⁺²(aq) + 2e⁻ → Zn(s)

We can establish the following relations:

1 min = 60 s
1 A = 1 C/s
The charge of 1 mole of electrons is 96,468 C (Faraday's constant).
When 2 moles of electrons circulate, 1 mole of Zn is deposited.
The molar mass of Zn is 65.38 g/mol

The mass of Zn deposited under these conditions is:

$24min \times \frac{60s}{1min} \times \frac{6.5C}{s} \times \frac{1mol\ e^{-} }{96,468C} \times \frac{1molZn}{2mol\ e^{-}} \times \frac{65.38g}{1molZn} = 3.17 g$

3 0

3 years ago

Convert 12.64 g of NaOH to moles

Luden [163]

.316 moles just divide by the molar mass of naoh which is 39.997. So 12.64 divived by 39.997 is .3160237. that is 3.16x10-1

8 0

3 years ago

Read 2 more answers