bab 4 Flashcards

1
Q

helium

A
  • diisi dalam belon kaji cuaca
  • dlm tangki oksigen penyelan
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2
Q

neon

A
  • lampu papan iklan
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3
Q

argon

A
  • dlm mentol
  • membekalkan atmosfera lengai dlm kerja mengimpal pd suhu yg tinggi
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4
Q

kripton

A
  • lampu denyar kilat pada kamera
  • dlm laser rawatan retina mata
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5
Q

xenon

A
  • lampu rumah api
  • ubat bius
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6
Q

radon

A

rawat kanser

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7
Q

lithium

A

bateri

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8
Q

natrium

A

lampu wap natrium

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9
Q

kalium (kalium nitrat)

A

baja kalium nitrat

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10
Q

klorin

A

peluntur

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11
Q

bromin

A

pemadam api

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12
Q

unsur kumpulan 18

A

he, Ne, Ar, Kr, se,Rn,Og

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13
Q

sifat kumpulan 18

A
  • tidak reaktif dan lengai
  • tidak berkongsi, menerima, melepaskan elektron dgn unsur yg lain
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14
Q

unsur kumpulan 1 (logam alkali)

A

lithium, natrium, kalium, ribidium, sesium, fransium

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15
Q

mengapakah takat lebur dan takat didih unsur semakin berkurang apabila menuruni kumpulan 1?

A
  • pertambahan saiz atom menuruni kumpulan akan menyebabkan ikatan logam menjadi semakin lemah. Oleh itu, semakin kurang tenaga haba yg diperlukan utk memutuskan ikatan logam
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16
Q

sifat unsur kumpulan 1

A
  • logam yg bersifat lembut
  • mempunyai ketumpatan yg rendah
  • terapaung di atas permukaan air
  • permukaan kelabu yg berkilat pd suhu bilik
17
Q

unsur kumpulan 17 (halogen) (molekul dwiatom)

A

Fluorin, klorin, bromin, iodin, astatin & tennessine