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Norma-Jean [14]
4 years ago
14

Match each substance with its correct definition.

Chemistry
2 answers:
GrogVix [38]4 years ago
5 0
A-3 --> neutral is a substance with a pH of 7
b-2--> base is a substance with a pH of 10
c-1--> acid is a substance with a pH of 3
d-5--> pH scale is a scale that represents the concentration of H₃O⁺, 0-14
e-4--> phenolphthalein is an indicator
RSB [31]4 years ago
5 0

<u>Explanation:</u>

pH is defined as the measure of hydrogen ion in a solution. It ranges from 0 to 14. A solution having a pH range from 0 to 6.9 is known as acidic solution and the solution which have a pH range from 7.1 to 14 is known as basic solution.

The solution having a pH of 7 is known as neutral solution.

  • <u>For a:</u> neutral

A neutral substance always have a pH of 7.

  • <u>For b:</u> base

A basic substance has a pH range of 7.1 to 14. So the correct answer is it has a pH of 10.

  • <u>For c:</u> acid

An acidic substance has a pH range of 0 to 6.9. So, the correct answer is it has a pH of 3.

  • <u>For d:</u> pH scale

This scale lies in the pH range of 0 to 14 and it measures the concentration of hydrogen ion or hydronium ions in a solution.

  • <u>For e:</u> phenolphthalein

This substance is an indicator and it tells the acidity or basicity of a solution. Hence, the correct answer is an indicator.

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Which metal in Period 5 is very reactive and has two valence electrons in each atom?
Romashka-Z-Leto [24]
The answer is Strontium(Sr). The reactive increase from right to left. And this element has two valence electrons. So Rb is not correct. Then the very reactive metal is Sr.
8 0
3 years ago
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Convert each into decimal form.<br>a) 1.56× 10^3<br>b) 0.56×10-4​
Lera25 [3.4K]

Answer: A = 1560

               B = 1.6

Explanation: brainlest please

3 0
4 years ago
Write a balanced equation from each cell notation:(b) Fe(s) | Fe²⁺(aq) | NO₃⁻(aq) | NO(g) | Pt(s)
tatiyna

The balanced redox reaction is

3Fe + 2NO₃⁻+ 8H+ → 3Fe²⁺ + 2NO + 4H2O

<h3>What is Galvanic cell? </h3>

It is a device that is used for the conversion of the chemical energy which is produce in the redox reaction into the electrical energy. It is also termed as the voltaic cell or electrochemical cell.

In the voltaic cell, at anode which is negative electrode of voltaic cell oxidation occurs and at the cathode which is positive electrode, reduction occurs

<h3>What is redox reaction? </h3>

The reaction in which both reduction and oxidation reaction takes place simultaneously is known as redox reaction.

<h3>What is oxidation reaction? </h3>

The reaction in which a substance or compound or species looses its electrons. In this reaction, oxidation state of an element increases.

<h3>What is reduction reaction? </h3>

The reaction in which a substance or compound or species accept the electrons. In this reaction, oxidation state of an element decreases.

The given two-half reactions are:

At anode:

3Fe → 3Fe²⁺ + 6e-

At cathode:

8H(+) + 2NO₃⁻ → 2NO + 4H2O

Redox reaction:

3Fe + 2NO₃⁻+ 8H+ → 3Fe²⁺ + 2NO + 4H2O

According to the voltaic cell, the half-cell reaction (1) shows oxidation reaction therefore, it occurs at anode and the half-cell reaction (2) shows reduction reaction therefore, it occurs at cathode.

Thus, we concluded that the redox reaction is

3Fe + 2NO₃⁻+ 8H+ → 3Fe²⁺ + 2NO + 4H2O

learn more about voltaic cell:

brainly.com/question/4052514

#SPJ4

7 0
2 years ago
Identify which one is the reducing agent in this reaction
Romashka-Z-Leto [24]

Answer:

Na.

Explanation:

  • The oxidation-reduction reaction contains a reductant and an oxidant (oxidizing agent).
  • An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. Also known as the electron acceptor, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced.
  • A reducing agent (also called a reductant or reducer) is an element (such as calcium) or compound that loses (or "donates") an electron to another chemical species in a redox chemical reaction.

  • For the reaction:

<em>2Na + S → Na₂S.</em>

<em></em>

Na is oxidized to Na⁺ in (Na₂S) (loses 1 electron). "reducing agent".

S is reduced to S²⁻ in (Na₂S) (gains 2 electrons). "oxidizing agent".

6 0
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Briefly explain why adding salt to icy roads helps melt the ice and prevent it from freezing again.
g100num [7]

Answer:

See explanation below

Explanation:

The melting point (the temperature that it changes from solid to liquid) of a pure substance depends on its mass, the forces between its molecules, and the pressure of the system.

The melting point, or the freezing point, of a mixture, is a temperature between the melting point of its components. Salt has a huge negative melting point, so when it is added to the water, the melting point decreases from 0ºC to -21ºC approximately.

So, the water will only freeze again if the temperature becomes below -21ºC which is very difficult to happen.

3 0
3 years ago
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