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Chem (1st) > 3rd May Mock - Key Facts Flashcards > Flashcards

3rd May Mock - Key Facts Flashcards

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1
Q

What is the formula for a chlorine molecule?

A

Cl2

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2
Q

What is the formula for an ammonia molecule?

A

NH3

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3
Q

What is the formula for a hydrogen molecule?

A

H2

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4
Q

What is the formula for an oxygen molecule?

A

O2

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5
Q

What is the formula for an ammonium ion?

A

NH4 +

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6
Q

What is the formula for a nitrate ion?

A

NO3 -

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7
Q

What is the formula for a sulphate ion?

A

SO4 2-

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8
Q

What is the formula for a hydroxide ion?

A

OH -

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9
Q

What is the formula for a carbonate ion?

A

CO3 2-

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10
Q

Ar (Relative Atomic Mass) =

A

(∑(relative isotopic mass * isotopic percentage abundance) / sum of abundances [100%]

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11
Q

Where is the divide between metals and non-metals on the periodic table?

A

Boron is the most left non-metal, from there the divide is like stairs downwards.

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12
Q

What are positively charged ions called?

A

Cations

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13
Q

What are negatively charged ions called?

A

Anions

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14
Q

What are the advantages and disadvantages of 2D representations of atoms?

A

Advantages:
• Show what atoms something contains
• Show how the atoms are connected

Disadvantages:
• Don’t show the shape of the substance
• Don’t represent the relative sizes of the atoms

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15
Q

What are the advantages and disadvantages of dot and cross diagrams?

A

Advantages:
• Show how compounds/molecules are formed
• Show how atoms are connected

Disadvantages:
• Don’t show the relative size of the atoms/ions
• Don’t show how the atoms/ions are arranged

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16
Q

What are the advantages and disadvantages of ball and stick models?

A

Advantages:
• Good at visualising structures
• Show the shape of the lattice or molecule

Disadvantages:
• There are big gaps where, in reality, the electron clouds interact
• Don’t show the correct scales of atoms/ions

17
Q

What is Mr?

A

Relative formula mass - the relative atomics masses of all the atoms in a formula combined

18
Q

concentration (g dm^-3) =

A

mass of solute (g) / volume of solution (dm^3 (litres))

19
Q

(no. of) moles =

A

mass/Mr

20
Q

no. of particles =

A

moles * Avogrado’s constant

21
Q

What is Avogadro’s constant?

A

6.02 * 10^23

22
Q

Rf value =

A

distance travelled by solute / distance travelled by solvent

Chem (1st) (4 decks)

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