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Chemistry Term 2 > Topic 2.1 Atoms And Reactions Key Words > Flashcards

Topic 2.1 Atoms And Reactions Key Words Flashcards

1
Q

What is a mole?

A

The amount of any substance containing as many elementary particles as there are carbon atoms in exactly 12 g of the carbon 12 isotope. That is 6.02×10 to the power of 23 particles.

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2
Q

What is the empirical formula?

A

The formula that shows the simplest whole number ratio of atoms of each element present in a compound

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3
Q

What is the molecular formula?

A

A formula that shows the number and type of atoms of each element present in a molecule

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4
Q

What does anhydrous mean?

A

Containing no water molecules

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5
Q

What does hydrated mean?

A

A crystalline compound containing water molecules

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6
Q

What is water of crystallisation?

A

Water molecules that are bonded in a crystalline structure of a compound

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7
Q

What is percentage yield?

A

A comparison of the amount produced to what you actually got

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8
Q

Why is % yield never 100%?

A

1) Gaseous products
2) reversible reaction
3) Other reactions occurring
4) Isolating products loses

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9
Q

What is atom economy?

A

Demonstrates the % mass of all products that is desirable

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10
Q

What is an acid?

A

A species that releases H+ ions in solution and has pH lower than 7

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11
Q

What is an alkali?

A

A soluble base that dissolves in water forming OH- ions

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12
Q

What is a strong acid compared to a weak acid?

A

Weak = partial ionisation whereas strong = complete ionisation

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13
Q

What is the difference between a concentrated and dilute acid?

A

Concentrated = many H+ ions in a given volume whereas dilute = few H+ ions on a given volume

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14
Q

What is a neutralisation reaction?

A

A reaction in which an acid and base react together forming a salt

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15
Q

What is concordant result?

A

Results within 0.1cm3 of each other

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16
Q

What is the purpose of spectroscopy?

A

To identify the molecular mass of an organic compound

17
Q

What is relative atomic mass?

A

The mean average mass of an atom compared to 1/12th the mass of an atom of carbon-12

18
Q

What is Relative isotopic mass?

A

The mass of an isotope of an atom compared to 1/12th the mass of carbon-12

19
Q

What is relative molecular mass?

A

The mean average mass of a molecule of an element or compound compared to 1/12th the mass of an atom of carbon-12

20
Q

What is the relative mass of an electron?

A

1/1836

Chemistry Term 2 (8 decks)

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