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Science Essentials > Miscellaneous Chemistry > Flashcards

Miscellaneous Chemistry Flashcards

1
Q

What is the equation for the volume of a gas?

A

volume = 24 x moles

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2
Q

What is the equation for the concentration of a solution?

A

conc = mass/volume

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3
Q

What is nitrogen for in an NPK fertiliser?

A

Healthy foliage

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4
Q

What is Phosphurus for in an NPK fertiliser?

A

Strong roots

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5
Q

What is Potassium for in an NPK fertiliser?

A

Growth

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6
Q

What happens to the position of equilibrium when pressure is increased?

A

It shifts to the side with more molecules.

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7
Q

What is the effect of increasing temperature on equilibrium?

A

The position shifts towards the endothermic reaction

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8
Q

In which ways are salts formed?

A

Acid + metal hyddroxide → salt + water
Metal oxide + acid → salt + water
Metal carbonate + acid → salt + water + carbon dioxide
Metal + acid → salt + hydrogen

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9
Q

In electrolysis of aqeous solutions, which ions are discharged at the positive anode

A

Oxygen ions, unless the ionic compound contains halide ions. In this case, the halide ions are discharged

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10
Q

In electrolysis of aqeous solutions, which ions are discharged at the negative cathode

A

Hydrogen ions, unless the ionic compound contains metal ions from a metal LESS reactive than hydrogen.

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11
Q

What is the half equation at the POSITIVE CATHODE in a hydrogen fuel cell?

A

O2 + 4H+ + 4e- –> 2H2O

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12
Q

What is the half equation at the NEGATIVE ANODE in a hydrogen fuel cell?

A

2H2 –> 4H+ + 4e-

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13
Q

What is the overall reaction in a hydrogen fuel cell?

A

2H2 + O2 –> 2H2O

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14
Q

What is the trend of boiling points in Group 0 (Noble Gases)

A

Increases as atoms get heavier going down the group

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15
Q

What is the trend of reactivity in Group 0 (Noble Gases)

A

Very unreactive

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16
Q

What is the trend of melting points in Group 1 (Alkali Metals)

A

Melting points decrease as the atoms get bigger going down the group

17
Q

What is the trend of reactivity in Group 1 (Alkali Metals)

A

Get more reactive as you go down the group

18
Q

What is the trend of melting points in Group 7 (Halogens)

A

Increase as the molecules get heavier going down the group

19
Q

What is the trend of reactivity in Group 7 (Halogens)

A

Get less reactive further down the group

Science Essentials (11 decks)

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