Physical And Chemical Changes
Bayani Gaba-gaba
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.
Manufura
- Identify physical and chemical changes, and describe the differences between them.
Darasin Sauti
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Nazarin Darasi
Barka da kammala darasi akan Physical And Chemical Changes. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.
- 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
Yi aikin wadannan tambayoyi a cikin manhaja
Yi aikin wadannan tambayoyi a cikin manhaja
Littattafan da ake ba da shawarar karantawa
Ƙarin koyo daga tushe na buɗe
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Sashen littafi
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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