bonding and properties of substances

Question 1

what is an ionic bond?

Answer 1

the electrostatic attraction between positive and negative ions

Question 2

all non metals are insulators except from what?

Answer 2

carbon in the form of graphite

Question 3

why do metals conduct?

Answer 3

due to the presence of delocalised electrons

Question 4

what is electrolysis?

Answer 4

the use of electricity to break up an ionic compound

Question 5

what can electrolysis take place in?

Answer 5

an ionic solution or molten ionic compound

Question 6

what best allows products to be identified at each electrode?

Answer 6

a dc supply

Question 7

what is a covalent bond?

Answer 7

a shared pair of electrons between two non metal atoms

Question 8

what is an ionic lattice?

Answer 8

repeating pattern of positive and negative ions forming an ionic compound

Question 9

mp/bp of covalent molecular

Answer 9

low mp/bp

Question 10

mp/bp of covalent network

Answer 10

very high mp/bp

Question 11

mp/bp of ionic lattice

Answer 11

high mp/bp

Question 12

why can ionic compounds conduct?

Answer 12

conduct as molten liquids/aqueous solutions as ions are free to move around

Question 13

conductivity of covalent molecular compounds

Answer 13

do not conduct in any states

Question 14

what is metallic bonding?

Answer 14

the attraction between positive ions and delocalised electrons

Question 15

why do covalent molecules have low mp/bps

Answer 15

due to the presence of weak attractions between molecules

Question 16

why cant covalent substances conduct?

Answer 16

no charged particles present which are free to move

Question 17

what are diatomic molecules?

Answer 17

molecules which contain 2 atoms only

Question 18

what are the diatomic molecules?

Answer 18

I Br Cl F O N H
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iodine bromine chlorine fluorine oxygen nitrogen hydrogen

Question 19

what are the shapes of molecules?
draw and list

Answer 19

linear
trigonal pyramidal
angular
tetrahedral

Question 20

why do covalent networks have high mp/bp

Answer 20

strong covalent bonds need to be broken

Question 21

why can ionic lattices not conduct?

Answer 21

when in solid state the ions are held in a lattice structure and cannot move, if they cant move they cant conduct

Question 22

why can ionic compounds conduct in solution/when molten?

Answer 22

ionic lattice is destroyed and the ions are free to move

Question 23

what are ionic compounds held together by?

Answer 23

strong electrostatic forces of attraction between oppositely charged ions

Question 24

what type of bonding is usually a gas or liquid at room temperature?

Answer 24

covalent molecules

Question 25

why do ionic compounds have high mp/bp

Answer 25

due to the presence of high electrostatic force