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Chemistry > Chapter 3 > Flashcards

Chapter 3 Flashcards

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1
Q

What do oxidation numbers tell you about?

A

How many electrons an atom has donated or accepted to form an ion

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2
Q

What is the oxidation number of all uncombined elements?

A

0

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3
Q

What is the oxidation number of all elements that are bonded to identical elements?

A

0

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4
Q

What is the oxidation number of hydrogen in H2?

A

0

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5
Q

What is the oxidation number of a simple, monatomic ion?

A

The same as its charge

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6
Q

For molecular ions, what is the sum of the oxidation numbers equal to#?

A

The overall charge of the ion

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7
Q

For a neutral compound, what is the overall charge?

A

0

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8
Q

So, for a neutral compound what is the sum of the oxidation numbers?

A

0

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9
Q

When is the only time that hydrogen doesn’t have an oxidation number of +1?

A

In metal hydrides

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10
Q

When is the only occasion that oxygen doesn’t have an oxidation number of -2?

A

In peroxides (O2)2-

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11
Q

What do roman numerals tell you?

A

The oxidation number of the elements

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12
Q

In copper(I) oxide, what is the oxidation number of copper?

A

+1

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13
Q

What is the formula of copper (I) oxide?

A

Cu2O

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14
Q

What do ions ending in ‘ate’ contain?

A

Oxygen and another elements

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15
Q

What is the formula of a nitrate ion?

A

NO3-

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16
Q

What is the oxidation number of H in H2?

A

0

17
Q

What is the usual oxidation number of oxygen when its combined with another elements?

A

-2

18
Q

What is a redox reaction?

A

When electrons are transferred in a reaction

19
Q

What is oxidation?

A

A loss of electrons

20
Q

What is reduction

A

A gain in electrons

21
Q

What is an oxidising agent?

A

An element that accepts electrons and gets reduced

22
Q

What is a reducing agent?

A

An element that donates electrons and gets oxidised

23
Q

What is a disproportionation reaction?

A

A special redox reaction, where an element in a single species is simultaneously oxidised and reduced

24
Q

What can ionic half equations show?

A

Oxidation and reduction

25
Q

What can you combine half-equations for different oxidising or reducing agents together to make?

A

Full equations for redox reactions

26
Q

In order to balance ionic half equations, what 3 elements/compounds can you use to balance the equation?

A

e-, H+ and H20

Chemistry (25 decks)

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