periodic table

Question 1

is hydrogen considered metal or non-metal element

Answer 1

non-metal

Question 2

is the ‘group’ horizontal or vertical

Answer 2

vertical

Question 3

is the ‘period’ horizontal or vertical

Answer 3

horizontal

Question 4

how to write the chemical symbol

Answer 4

write the symbol in the middle
mass no. on the top
proton no. on the bottom

Question 5

what group are noble gases

Answer 5

group 8

Question 6

what is a noble gas

Answer 6

fully filled electron = means its stable

Question 7

name the diatomic molecule

Answer 7

hydrogen
nitrogen
fluorine
chlorine
bromine
iodine
asatatine

Question 8

explain how fluorine atom form a diatomic molecule

Answer 8

a fluorine atom shares one electron with another fluorine atom to form a diatomic molecule

Question 9

if the element has the same period, it means that…

Answer 9

it has the same no. of electron shells

Question 10

if the element has the same group, it means that…

Answer 10

it has the same no. of valence electrons

Question 11

same group of elements will undergo… and have similar…

Answer 11

similar chemical reactions

have similar chemical properties

Question 12

the elements are arranged in…

Answer 12

increasing proton number

Question 13

what are group 1 elements called

Answer 13

alkali metals

Question 14

what are the physical properties of alkali metal

Answer 14

soft and can easily be cut
low boiling and melting point
low density

Question 15

in alkali metals, as we go down the group… (what are the physical and chemical properties)

Answer 15

melting and boiling point decrease
density increase
reactivity increases

Question 16

in alkali metals, what are the observations in lithium

Answer 16

reacts quickly
floats on water
no flame

Question 17

in alkali metals, what are the observations in sodium

Answer 17

reacts very quickly
skids on the surface
yellow flame

Question 18

in alkali metals, what are the observations in potassium

Answer 18

extremely fast
vigorously with water
catches fire, lilac flame

Question 19

in alkali metals, what are the observations in rubidium

Answer 19

violently with water

explodes almost immediately

Question 20

what are group VII elements called

Answer 20

halogens

Question 21

what are the physical properties of halogens

Answer 21

low melting and boiling points
low density
poor conductors of heat and electricity

Question 22

in halogens, what is the colour and the state of fluorine

Answer 22

pale yellow

gas

Question 23

in halogens, what is the colour and the state of chlorine

Answer 23

yellowish-green

gas

Question 24

in halogens, what is the colour and the state of bromine

Answer 24

reddish-brown

liquid

Question 25

in halogens, what is the colour and the state of iodine

Answer 25

purplish-black | solid

Question 26

in halogens, what is the colour and the state of astatine

Answer 26

black solid

Question 27

in halogens, as we go down the group... (what are the physical and chemical properties)

Answer 27

melting and boiling point increases density increases reactivity decreases colour gets darker

Question 28

what are group 0 elements called

Answer 28

noble gas

Question 29

what are the characteristics of noble gas

Answer 29

low melting and boiling points inert/ nonreactive monotonic

Question 30

explain why and where should an alkali metals be stored

Answer 30

kept in oil for safety to prevent reaction with oxygen and water

Question 31

metal + oxygen -->

Answer 31

metal oxide

Question 32

metal + cold water -->

Answer 32

metal hydroxide + hydrogen

Question 33

what are the 2 reactions of alkali metal

Answer 33

metal + oxygen | metal + cold water

Question 34

in displacement reactions of halogens, explain the reactions of potassium chloride and iodine

Answer 34

there is no reaction | iodine is less reactive than bromine hence it cannot displace bromine from potassium bromide solution

Question 35

in displacement reactions of halogens, explain the reactions of potassium bromide and chlorine

Answer 35

the colourless solution (potassium bromide) turns reddish brown (aqueous bromide) this is because chlorine is more reactive than bromine hence chlorine displaces bromine from potassium bromide solution

Question 36

what is the chemical equation of chlorine displacing bromine from potassium bromide solution

Answer 36

2KBr + Cl2 --> 2KCl + Br2

Question 37

in displacement reactions of halogens, explain the reactions of potassium bromide and iodine

Answer 37

there is no reaction | iodine is less reactive than bromine hence it cannot displace bromine from potassium bromide solution

Question 38

in displacement reactions of halogens, explain the reactions of potassium iodide and chlorine

Answer 38

the colourless solution (potassium iodide) turns brown (iodine) this is because chlorine is more reactive than iodine hence chlorine displaces iodine from potassium iodide solution

Question 39

what is the chemical equation of chlorine displacing bromine from potassium iodide solution

Answer 39

2Kl + Cl2 --> 2KCl + l2