Remember these things

Question 1

All elements are solids except. . .

Answer 1

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

Question 2

Which are always gases?

Answer 2

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

Question 3

Which are usually liquids?

Answer 3

Hg, Br2, & H2O

Question 4

Which are soluble?

Answer 4

• 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

Question 5

Which are insoluble?

Answer 5

• 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

Question 6

what characterises a resonance structure?

Answer 6

double bonds can be drawn in alternative positions

Question 7

what type of bonding is found in SiO2?

Answer 7

giant & covalent

Question 8

which formula is used for enthalpy change of COMBUSTION REACTION?

Answer 8

sum (reactants) - sum (products)

Question 9

example of amphiprotic species

Answer 9

HPO4 2-

Question 10

what can mass spectrometry detect?

Answer 10

isotopes of an element

Question 11

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

Answer 11

TEMPERATURE CHANGE

Question 12

easy way to tell is acid is weak?

Answer 12

check if it has NH2 or COOH

Question 13

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

Answer 13

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

Question 14

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

Answer 14

with the LEAST number of sig figs

Question 15

what does lower mass / charge ratio mean?

Answer 15

MORE DEFLECTION

Question 16

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

Answer 16

TEMPERATURE CHANGE IS EQUAL

Question 17

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

Answer 17

4

Question 18

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

Answer 18

2

Question 19

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

Answer 19

LIQUID

Question 20

features of graphite

Answer 20

• 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

Question 21

structure + bonding of SiO2

Answer 21

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

Question 22

what are possible products of the incomplete combustion of propane?

Answer 22

carbon, carbon monoxide, & water

Question 23

Is silicon acidic or basic?

Answer 23

acidic

Question 24

units for specific heat capacity

Answer 24

kJ kg^-1 K^-1

Question 25

what is the molecular geometry of H3O+?

Answer 25

trigonal pyramidal

Question 26

changing volume does not change . . .

Answer 26

initial rate of reaction

Question 27

which has higher conductivity, HCl or H2CO3?

Answer 27

HCl since H2CO3 is a weak acid

Question 28

Is Cl in ClCH2COOH an ion?

Answer 28

NOOOO IT'S NOT IONIC

Question 29

Is Cl in ClCH2COOH an ion?

Answer 29

NOOOO IT'S NOT IONIC

Question 30

compare the structure of silicon & silicon dioxide

Answer 30

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

Question 31

Which atoms react to form a dative covalent bond?

Answer 31

NH3 & HF

Question 32

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

Answer 32

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

Question 33

which species can oxidise ethanol to ethanoic acid?

Answer 33

acidified K2Cr2O7

Question 34

are free radical charged or uncharged?

Answer 34

they are UNCHARGED

Question 35

what is correct about the polymerisation of ethene to polyethene?

Answer 35

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

Question 36

what is correct about the polymerisation of ethene to polyethene?

Answer 36

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

Question 37

what describes the flow of electrons in a voltaic cell?

Answer 37

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

Question 38

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

Answer 38

a LONG carbon chain will have the higher boiling point

Question 39

What is correct for benzene?

Answer 39

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