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.
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Akwụkwọ Ọmụmụ
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Nnyocha Ọmụmụ
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
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Physical and Chemical Properties
Identify properties of and changes in matter as physical or chemical
"Chemistry: Physical and Chemical Properties" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/1-3-physical-and-chemical-properties. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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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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