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Chemistry SL > Remember these things > Flashcards

Remember these things Flashcards

1
Q

All elements are solids except. . .

A
  • diatomic molecules (NOT INCLUDING I2)
  • noble gases
  • Hg & H2O
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2
Q

Which are always gases?

A

H2, N2, O2, F2, Cl2, noble gases

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3
Q

Which are usually liquids?

A

Hg, Br2, & H2O

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4
Q

Which are soluble?

A
  • All nitrates, acetates, ammonium, & group 1 salts
  • All chlorides, bromides, & iodides (EXCEPT SILVER, LEAD, & MERCURY (I))
  • All fluorides EXCEPT group 2, lead (II) & iron (III)
  • All sulfates except calcium, strontium, barium, mercury, lead & silver
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5
Q

Which are insoluble?

A
  • All carbonates & phosphates EXCEPT group 1 & ammonium
  • All hydroxides except group 1, strontium, barium, and ammonium
  • All sulfides except group 1, 2, & ammonium
  • All oxides except group 1
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6
Q

what characterises a resonance structure?

A

double bonds can be drawn in alternative positions

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7
Q

what type of bonding is found in SiO2?

A

giant & covalent

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8
Q

which formula is used for enthalpy change of COMBUSTION REACTION?

A

sum (reactants) - sum (products)

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9
Q

example of amphiprotic species

A

HPO4 2-

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10
Q

what can mass spectrometry detect?

A

isotopes of an element

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11
Q

Which quantity is likely to be most inaccurate (in enthalpy experiment)?

A

TEMPERATURE CHANGE

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12
Q

easy way to tell is acid is weak?

A

check if it has NH2 or COOH

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13
Q

If you have 2 methyl groups on one carbon (e.g. carbon-3), remember to write. . .

A

e.g. 3,3-dimethyl. . .

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14
Q

Remember that if you are dividing / multiplying, use the value. . .

A

with the LEAST number of sig figs

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15
Q

what does lower mass / charge ratio mean?

A

MORE DEFLECTION

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16
Q

what happens to temperature change if you double the volume & concentration of BOTH reactants when alkali and acid are mixed?

A

TEMPERATURE CHANGE IS EQUAL

17
Q

How many O atoms is each Si atom bonded to in SiO2?

A

4

18
Q

How many Si atoms is each O atom bonded to in SiO2?

A

2

19
Q

IN COMBUSTION REACTION, WHAT IS THE STATE SYMBOL OF H2O FORMED?

A

LIQUID

20
Q

features of graphite

A
  • carbon atoms are held in layers w/ weak attraction b/w layers
  • graphite is non-metal which conducts electricity
  • each carbon atom is covalently bonded to 3 other carbon atoms
21
Q

structure + bonding of SiO2

A
  • giant covalent network
  • each oxygen atom is covalently bonded to 2 oxygen atoms
22
Q

what are possible products of the incomplete combustion of propane?

A

carbon, carbon monoxide, & water

23
Q

Is silicon acidic or basic?

A

acidic

24
Q

units for specific heat capacity

A

kJ kg^-1 K^-1

25
Q

what is the molecular geometry of H3O+?

A

trigonal pyramidal

26
Q

changing volume does not change . . .

A

initial rate of reaction

27
Q

which has higher conductivity, HCl or H2CO3?

A

HCl since H2CO3 is a weak acid

28
Q

Is Cl in ClCH2COOH an ion?

A

NOOOO IT’S NOT IONIC

29
Q

Is Cl in ClCH2COOH an ion?

A

NOOOO IT’S NOT IONIC

30
Q

compare the structure of silicon & silicon dioxide

A

both are tetrahedral
4 Si-Si bonds per atom in silicon
4 Si-O bonds per silicon atom in silicon dioxide

31
Q

Which atoms react to form a dative covalent bond?

A

NH3 & HF

32
Q

Which equation corresponds to the bond enthalpy of the H-I bond?

A

HI (g) –> H(g) + I(g)

NOTTTT 1/2H2 or something weird like that remember it has to NOT be diatomic - cant have any bonds present in products

33
Q

which species can oxidise ethanol to ethanoic acid?

A

acidified K2Cr2O7

34
Q

are free radical charged or uncharged?

A

they are UNCHARGED

35
Q

what is correct about the polymerisation of ethene to polyethene?

A

the monomer ethene & the repeating unit have the SAME empirical formula

36
Q

what is correct about the polymerisation of ethene to polyethene?

A

the monomer ethene & the repeating unit have the SAME empirical formula

37
Q

what describes the flow of electrons in a voltaic cell?

A

from the ANODE (negative electrode) to the CATHODE (positive electrode) through the external circuit

38
Q

does a LONG or BRANCHED carbon chain have a higher boiling point?

A

a LONG carbon chain will have the higher boiling point

39
Q

What is correct for benzene?

A

its HNMR spectrum shows 1 signal & it forms a single C6H5Br isomer

Chemistry SL (5 decks)

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