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Alina [70]
3 years ago
9

Who discovered electron ???

Chemistry
1 answer:
Zanzabum3 years ago
5 0

It was a Cambridge UK scientist in the early part of the 20 th century who discovered the electron. His name was J J Thompson.

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How many moles are in 45.8 g of calcium nitrate, Ca(NO3),?
Deffense [45]

Answer:

the number of moles is 0.279

Explanation:

The calculation of the number of moles of calcium nitrate, is given  below;

As We know that

Number of moles = mass of substance ÷ molecular weight

where

Mass of substance is 45.8g

And, the molecular weight is 164.088

so,

= 45.8 g ÷ 164.088

= 0.279moles

Thus , the number of moles is 0.279

We simply used the above formula so that the accurate value could arrive

4 0
3 years ago
NO<br> Assign oxidation numbers to each element in this compound.
marta [7]

Answer:

N=+2

O=-2

Explanation:

The compound NO is electrically neutral.

Lets assign the oxidation number of nitrogen to be N. The oxidation number of oxygen (-2) is then used as a reference.

For the compound to have a zero charge,  sum of the oxidation numbers equals zero.

N+ (-2)=0

N=+2

O=-2

7 0
3 years ago
How many moles are there in 32.4 grams of Na
Natalija [7]
Divide that my the molar mass which is 23 so 1.4087 g
8 0
3 years ago
Pick the correct model
frutty [35]

Answer:

A and B is the answer as there structure change

3 0
3 years ago
When water reacts with potassium metal the hydrogen produced ignites explosively on the surface of water .What cause the ignitio
Julli [10]

Answer:

Pottasium reacts with water vigorously and the reation is exothermic. The heat released causes the hydrogen released to ignite

Explanation:

7 0
3 years ago
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