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A-Level Edexcel Chemistry Flashcards > 4:Formulae, Equations and Amount of Substance > Flashcards

4:Formulae, Equations and Amount of Substance Flashcards

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1
Q

What is Avogadro’s constant

A

6.022x10^23

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2
Q

How do you calculate mass using moles and relative molecules mass (Mr)?

A

Mass = moles x Mr

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3
Q

What is the definition of relative atomic mass?

A

The mean mass of an atom of an element, divided by one twelfth of the mean mass of an atom of the carbon-12 isotope

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4
Q

What is the definition of relative molecular mass?

A

The mean mass of a molecule of a compound, divided by one twelfth of the mean mass of an atom of the carbon-12 isotope.

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5
Q

What is the formula for sulphuric acid?

A

H2SO4

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6
Q

What is the formula for nitric acid?

A

HNO3

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7
Q

What is the formula for phosphoric acid?

A

H3PO4

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8
Q

What is the formula for hydrogen sulfide?

A

H2S

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9
Q

What is the equation for metal + water?

A

Metal + Water —> Metal hydroxide + hydrogen

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10
Q

What is the equation for metal + acid?

A

Metal + Acid —> Salt + Hydrogen

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11
Q

What is the equation for oxide + acid?

A

Oxide + Acid —> Salt + Water

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12
Q

What is the equation for hydroxide + acid?

A

Hydroxide + Acid —> Salt + Water

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13
Q

What is the equation for carbonate + acid?

A

Carbonate + Acid —> Salt + Water + Carbon dioxide

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14
Q

What is the equation for hydrogencarbonate + acid?

A

Hydrogencarbonate + Acid —> Salt + Water + Carbon dioxide

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15
Q

What is the equation for ammonia + acid?

A

Ammonia + Acid —> Ammonium salt

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16
Q

What is the definition of a mole?

A

A unit used to measure the amount of a substance

17
Q

What does a metal carbonate break down into?

A

Metal carbonate —> Metal oxide + Carbon Dioxide

18
Q

What is the definition of molar mass?

A

A substance’s mass in grams per mole

19
Q

What is the empirical formula?

A

The simplest whole number ratio of atoms of each element in a compound

20
Q

What is the molecular formula?

A

The actual number of each atom in a molecule

21
Q

How do you calculate the imperial formula of a compound from its compositing by using mass or percentage?

A

1) Mass or percentage / Ar of all elements
2) Write it’s simplest whole number ratio form

22
Q

What is the ideal gas equation?

A

P x v = n x R x T

23
Q

What is P in the ideal gas equation?

A

Pressure (Pa)

24
Q

What is v in the ideal gas equation?

A

Volume (m^3)

25
Q

What is n in the ideal gas equation?

A

Number of moles

26
Q

What is R in the ideal gas equation?

A

Gas Constant (8.31 J mol^-1 K^-1)

27
Q

What is T in the ideal gas equation?

A

Temperature (K)

28
Q

How do you get from dm^3 to m^3?

A

Divide by 1000

29
Q

How do you get from cm^3 to m^3?

A

Divide by 1x10^6

30
Q

How do you get from Celsius to Kelvin?

A

°C + 273 = K

31
Q

In the ideal gas equation what is the relationship between pressure and temperature?

A

Pressure is proportional to temperature

32
Q

In the ideal gas equation what is the relationship between volume and temperature?

A

Volume is proportional to temperature

33
Q

In the ideal gas equation what is the relationship between pressure and volume?

A

Pressure and Volume are inversely proportional

34
Q

What is the equation for percentage yield?

A

Percentage yield = actual mass / theoretical mass

35
Q

What is the equation for atom economy?

A

Atom economy = Mr of desired product / Mr of all reactants

36
Q

How do you calculate the volume of gas in dm^3?

A

24 x number of moles

A-Level Edexcel Chemistry Flashcards (5 decks)

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