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Paper 1 GCSE Chemistry EC > Unit 4: Maths in Chemistry > Flashcards

Unit 4: Maths in Chemistry Flashcards

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1
Q

What is the moles equation?

A

Moles = mass / Mr

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2
Q

What does Mr stand for?

A

Relative molecular mass

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3
Q

What does Ar stand for?

A

Relative atomic mass

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4
Q

What is an isotope?

A

The same element with different neutrons

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5
Q

What is the conservation of mass law?

A

The mass of reactants = the mass of the products

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6
Q

How do you find the Ar for the element

A

It is it’s mass number (large number)

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7
Q

How do you find the Mr of a compound

A

Add up the masses of all the elements in that compound

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8
Q

State the relative charges of the subatomic particles

A

Protons: +1, neutrons: 0, electrons: -1

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9
Q

State the three subatomic particles

A

Protons, neutrons, electrons

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10
Q

Define element

A

A substance made of only one type of atom

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11
Q

Define compound

A

A substance made of two or more different atoms chemically bonded together

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12
Q

What is the atomic number of an atom?

A

The number of protons in an atom

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13
Q

What is the mass number of an atom?

A

The number of protons + the number of neutrons in an atom

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14
Q

How do you calculate the number of neutrons in an atom?

A

Mass number - atomic number

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15
Q

What is the concentration equation?

A

Concentration = mass/volume

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16
Q

How do you convert cm3 to dm3

A

Divide by 1000

17
Q

What does (s) stand for?

A

solid

18
Q

What does (l) stand for

A

liquid

19
Q

What does (aq) stand for

A

aqueous (dissolved in water)

20
Q

What does (g) stand for

A

gas

21
Q

How do you measure the volume of a gas?

A

Using a gas syringe

22
Q

Why does the mass of Mg go up when it is oxidised?

A

Because you are adding oxygen atoms to it

23
Q

What are the steps for reacting masses?

A

1) convert known mass to moles
2) use the molar ratio to find the moles of the product
3) calculate the mass of the unknown substance

24
Q

What are the steps for calculating concentration?

A

1) convert cm3 into dm3

3) Concentration =mass/volume

25
Q

How do you measure the volume of a solution?

A

Using a measuring cylinder

26
Q

How do you calculate the % mass of an element?

A

(mass of element/mass of compound) x 100

Paper 1 GCSE Chemistry EC (7 decks)

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