Physical And Chemical Changes
Gbogbo ọrọ náà
Melt an ice cube and you can freeze the water again. Burn a piece of paper and there is no getting it back. The difference between these two everyday events is the heart of one of chemistry's most useful ideas: the distinction between a physical change and a chemical change.
In this lesson you will learn to tell the two apart, using clear signs such as whether a new substance is formed and whether the change can be reversed. Getting this distinction right underpins almost everything else you will study, from changes of state to chemical reactions.
Ebumnobi
- Identify physical and chemical changes, and describe the differences between them.
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Physical And Chemical Changes. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Which of these is a physical change? A. Wood burning B. Iron rusting C. Ice melting D. Magnesium reacting with acid Answer: C
- Which of these is a chemical change? A. Salt dissolving in water B. Water boiling C. Sugar dissolving D. Paper burning Answer: D
- What is the most reliable sign that a chemical change has occurred? A. The substance has melted B. A new substance has been formed C. The substance has changed shape D. The substance has dissolved Answer: B
- Why is dissolving salt in water a physical change? A. A gas is given off B. The salt can be recovered by evaporation C. A new substance is formed D. Heat is always given out Answer: B
- Which change is the most difficult to reverse? A. Melting ice B. Dissolving sugar C. Burning magnesium D. Freezing water Answer: C
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Physical And Chemical Changes? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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