chapter 5 periodic table

Question 1

what are metalloids

Answer 1

elements that carry from both metals and non metals

Question 2

What are the chemical properties of alkali metals

Answer 2

1. reactivity and density increase as you go down the group
2. mp and bp are high and increase as you go down the group
3. theyre called alkali metals bec when reacting with water they form an alkaline solution
4. they give colorless solution

Question 3

what are the physical properties of alkali metals

Answer 3

1. they are shiny and soft, become softer as you go down
2. conduct electricity
3. all have low density

Question 3

why does reactivity increase down the group for alkali metals.
but decrease as you go down in halogens

Answer 3

as outer shell electrons get farther from the nucleus, attraction forces decrease making it easier to lose an electron.
makes it harder for halogens to gain an electron since attraction forces decrease

Question 4

Properties of Transition Metals

Answer 4

1. high mb and bp
2. high density (hard)
3. they form coloured compounds
4. The metals andtheir compounds act as catalysts
5. most of them have more than one valency

Question 5

Chemical Properties of halogens

Answer 5

1. density and mp,bp increases down.
2. reactivity increases up because it is easier to gain an electron since attraction forces are stronger

Question 6

What are the states of group 7 elements in room temp + their colours

Answer 6

Fluorine is a gas and is yellow
chlorine is also a gas but is green
Bromine is a dark red liquid and is a red vapour
iodine is a dark grey solid and a purple vapour

Question 7

uses of flurine

Answer 7

toothpaste

Question 8

uses of Chlorines

Answer 8

making bleach
water purification
making pvc
tests for chlorine gas (bleaches damp litmus paper.

Question 9

what colord does chlorine solution give when displacing iodine and bromine

Answer 9

Bromine: Orange
Iodine: Brown

Question 10

Akali Metals Reaction with water
Lithium, sodium and Potassium

Answer 10

Lithium: float, fizz
Sodium: float fizz and shoots across
Potassium:float, fizz and catches fire