Group 7 (halogens)
Akopọ
The halogens sit in Group 7 of the periodic table and include some of the most recognisable non-metals in chemistry. Chlorine disinfects swimming pools, bromine is one of only two elements that are liquid at room temperature, and iodine is the dark solid used to test for starch. Despite looking very different, all halogens share a pattern of chemical behaviour because they each have seven electrons in their outer shell.
In this lesson you will learn the physical properties and trends across Group 7, explore how displacement reactions reveal the reactivity trend, and practise predicting the properties of halogens you may not have met.
Awọn Afojusun
- Know the colours, physical states (at room temperature) and trends in physical properties of these elements
- Use knowledge of trends in Group 7 to predict the properties of other halogens
- Understand how displacement reactions involving halogens and halides provide evidence for the trend in reactivity in Group 7
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Group 7 (halogens). Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- What is the physical state of bromine at room temperature? A) Solid B) Liquid C) Gas D) Plasma Answer: B
- Which halogen is the most reactive? A) Iodine B) Bromine C) Chlorine D) Fluorine Answer: D
- What colour change is seen when chlorine water is added to potassium bromide solution? A) Colourless to brown B) Colourless to orange C) Orange to colourless D) Brown to colourless Answer: B
- Why does reactivity decrease down Group 7? A) The atoms lose electrons more easily B) The atoms have fewer electrons in their outer shell C) The outer shell is further from the nucleus, weakening the attraction for incoming electrons D) The atoms become smaller Answer: C
- Which of the following displacement reactions would NOT occur? A) Chlorine added to potassium iodide B) Bromine added to potassium iodide C) Iodine added to potassium bromide D) Chlorine added to potassium bromide Answer: C
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Group 7 (halogens)? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
Ṣe igbasilẹ ohun elo naa lori Google Playstore
Gbogbo ohun ti o nilo lati ṣe dara julọ ninu JAMB, WAEC ati NECO.
