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Flashcards in Redox reactions Deck (17):
1

How can you identify if a redox reaction has taken place?

If there has been a change in oxidation numbers. This indicates there has been a transfer of electrons.

2

What is a redox reaction?

A chemical reaction that involves a transfer of electrons between two species, a reductant and and oxidant. eg combustion.

3

What is oxidation?

A half reaction in which a chemical species increases its oxidation number due to the loss of electrons.

4

What is reduction?

A half reaction in which a chemical species decreases its oxidation number due to gaining electrons.

5

What is an oxidant?

The species that causes the oxidation of another substance is itself reduced as it gains electrons.

6

What is a reductant?

The species that causes the reduction of another species but is itself oxidised due to the loss of electrons.

7

What happens to a substance that is oxidised?

The substance loses electrons.

8

What happens to a substance that is reduced?

The substance gains electrons.

9

What are the three terms that go along with gaining electrons?

- reduction
- oxidant
- reduced

10

What are the three terms that go along with losing electrons?

- oxidation
- reductant
- oxidised

11

What is a redox conjugate pair?

An electron donor and its corresponding electron acceptor. They differ by a one or more electrons.

12

What is a half equation?

Half equations show the individual oxidation and reduction reactions occurring in a redox process. The show symbols and states.

13

What is a metal displacement reaction?

A chemical reaction in which a more reactive element displaces a less reactive element from its compound. The more reactive metal loses electrons.

14

Is a metal displacement reaction a type of redox reaction?

Yes

15

How can you determine if a spontaneous reaction will occur?

In order to predict if a spontaneous reaction will occur, you must use the electrochemical series. If a negative gradient occurs between the strongest oxidant and the strongest reductant, it is spontaneous.

16

What is corrosion?

Corrosion is the deterioration of a metal as a result of chemical reactions between it and the surrounding environment.

17

How does corrosion effect a metal?

- brittle
- less tensile strength
- less conductivity
- occupy larger volume: can get jammed
- causes deterioration: holes/ damage