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Chemexam w > As may 2019 > Flashcards

As may 2019 Flashcards

1
Q

Water bond angle

A

104.5

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2
Q

Atom economy

A

Product / total

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3
Q

Enthalpy change of reverse reaction

A

Opposite of Delta H

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4
Q

Electrophile

A

Electron pair acceptor

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5
Q

Percentage uncertainty

A

(Uncertainty / volume) x100

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6
Q

Explain the trend in boiling points of the halogens

A

Increases down the group

Increased London forces

More energy needed to overcome

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7
Q

You are supplied with a sample of ammonium bromide.

Describe simple tests that would identify the cation and anion present in ammonium bromide.

Include reagents, expected observations and relevant equations.

A

Test for Br– (anion)

Reagent AND observation
Silver nitrate/AgNO3 AND cream (precipitate)

Equation
Ag+ + Br– → AgBr

Test for NH4+ (cation)

Reagent and conditions –
(Heat with) NaOH

pH/indicator paper turns blue / purple / alkaline

Equation + –
NH4 +OH→NH3+H2O

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8
Q

Temperature and pressure used for standard enthalpy measurements

A

Temperature 298K

100kPa

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Chemexam w (4 decks)

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