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den301095 [7]
3 years ago
12

5.

Chemistry
1 answer:
telo118 [61]3 years ago
5 0

Answer:

(1) the same and the atoms have the same number of electrons

Explanation:

In a pure sample of copper, all the atoms have atomic numbers which are the same and the atoms have the same number of electrons.

Pure samples of a substance have a definite composition and are homogeneous all through.

To show this all the atoms that makes up the substance have the same number of electrons because they are of the same atom.

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You have two solutions, both with a concentration of 0.1M. Solution A contains a weak acid with a pKa of 5. The pH of solution A
viktelen [127]

Answer:guguhi

Explanation:

Guggugj

3 0
4 years ago
A substance contains just copper and oxygen analysis shows that a 12.5g sample contains 11.1 of cooper and 1.4 of oxygen what is
oksian1 [2.3K]

Answer:

The formula of the compound is Cu₂O.

Explanation:

From the question given above, the following data were obtained:

Mass of compound = 12.5 g

Mass of copper (Cu) = 11.1 g

Mass of oxygen (O) = 1.4 g

Formula of compound =?

The formula of the compound can be obtained as follow:

Cu = 11.1 g

O = 1.4 g

Divide by their molar mass

Cu = 11.1 / 63.5 = 0.175

O = 1.4 / 16 = 0.0875

Divide by the smallest

Cu = 0.175 / 0.0875 = 2

O = 0.0875 / 0.0875 = 1

Therefore, the formula of the compound is Cu₂O.

6 0
3 years ago
Which sublevels contain valence electrons in an atom of nitrogen
cestrela7 [59]

Sublevel 2s and 2p contains the valence electrons for nitrogen.

4 0
4 years ago
Which balanced equation represents an oxidation-reduction reaction?
Bingel [31]

Answer:

Oxidation states are used in chemistry solutions. It is a bond in which electron transfers easily from one nucleus to another nucleus.

Explanation:

  • Oxidation-reduction reactions have some rules.
  • The oxidation state is 0 at an uncombined bond.
  • The bond of oxidation reduction is +1 in alkeli metal.
  • The bond in two metal is +2
  • The oxidation reduction state at helogens is -1. It does not happened always.
  • The oxygen bond in oxidation and reduction is -2.
  • The sum of the oxidation state is equal to the compound charges.
  • In this process the changes occur for any elements. Redox could be occur. Its oxidized and reduction reaction can be seen in this process.
7 0
3 years ago
I have no idea what to do please help me quickly!
Irina18 [472]

Answer:

The farther away the planet the slower the revolution around the earth. the closer the faster.

Explanation:

its like a tetherball pole when it wraps around it gets closer and spins faster and faster untill it stops. Brainliest?

6 0
3 years ago
Read 2 more answers
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