Chemistry

Differences between Physical and Chemical Change

len Alfred Ajibola - Mon, 20th January, 2020 @ 13:44: PM

Topics in Chemistry

Chemistry Scheme of Work, SS1, First Term Chemistry Scheme of Work, SS1, Second Term Chemistry Scheme of Work, SS1, Third Term Compounds in Chemistry: Characteristics of Compounds Types of Mixture: Homogenous and Heterogeneous Mixtures Mixtures: Characteristics of Mixtures Physical Properties of Matter explained with Examples Chemical Properties of Matter explained with Examples Differences between Physical and Chemical Change Ionic Theory and Electrolysis Physical and Chemical Properties of Acids States of Matter: Characteristics of Solids Liquid State of Matter: Characteristics of Liquids Gaseous State of Matter: Characteristics of Gases Molar Mass, Worked Examples and Differences with Molecular Mass Elements: Characteristics of Elements Salts and Types of Salt in Chemistry Mixtures and Separation of Mixtures Mixtures and Separation of Mixtures - part 2 Mixtures and Separation of Mixtures - part 3


Academic Questions in Chemistry

Please check out our Test Your Knowledge page to see all Questions and Answers

The Separating Funnel is a technique used in the separation of mixtures. Another name for Separating Funnel is the _____ Funnel.

  • A. Partition
  • B. Separatory
  • C. Division
  • D. Liquid
  • E. Half
  • F. Dividing

2NH4+(aq) + Ag+(aq) -> 2H4AgN

The equation above represents _____ acid.

  • A. Svante Arrhenius'

  • B. Brønsted–Lowry's

  • C. Gilbert Lewis'

  • D. Avogadro's

  • E. Sir Isaac Newton's

  • F. Albert Einstein's

According to Brønsted Thomas Martin Lowry, an acid is defined as _____.

  • A. Any substance that produces hydrogen ion (H+) when dissolved in water

  • B. A substance that accepts electron pair in a chemical reaction

  • C. A substance that gives out hydronium ion (H3O+) when dissolved in water

  • D. A substance that donates a proton in a chemical reaction

  • E. A substance that reacts with a base to form salt and water

  • F. A substance whose hydrogen ions  (H+) are displaced after a reaction with metals higher in the activity, reactivity or electrochemical series

Which of the following is NOT a characteristic of chemical change?

  • A. A new thing is formed
  • B. It cannot be easily separated into it's constituents elements
  • C. A new chemical formula accompanies whatever is formed
  • D. The burning of candle is an example of a chemical change
  • E. Blood is an example of a chemical change
  • F. Iron rust is an example of a chemical change

Which of the following statement is FALSE concerning a physical change _____.

  • A. Substances formed in a physical change have a unique chemical formula and IUPAC name
  • B. It's a change that is easily reversible
  • C. It's a change that can be separated via an appropriate separation technique
  • D. No new substance is formed
  • E. A mixture of salt and water is a physical change
  • F. Physical change can result to a change in color and shapes of substances

The following substances will sublime EXCEPT _____.

  • A. Sodium Cryolite
  • B. Solid Carbon(IV)oxide
  • C. Arsenic
  • D. Sulphur
  • E. Iodine Crystals
  • F. Naphthalene

Which of the following is a state of matter?

  • A. Ions
  • B. Plasma
  • C. Compounds
  • D. Molecules
  • E. Atoms
  • F. None of the above

The ideal way of separating a mixture of blood is through _____.

  • A. Chromatography
  • B. Fractional Distillation
  • C. Centrifugation
  • D. Filtration
  • E. Separating Funnel
  • F. Fractional Crystallization

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Physical Change vs Chemical Change:

A physical change refers to a change that is easily reversible to whatever formed it. In addition, a new thing (product) is not formed whenever the change occur.

Please read on a detailed explanation of a Physical Change and Chemical Change here.

Note: The properties attributed to a physical change are referred to as physical properties.

Examples of physical properties include mass, volume, density, color, malleability, ductility, solubility, boiling point and melting point.

Please read on the Physical Properties of Matter explained here.

A chemical change is a change accompanied with the formation of a new substance that isn't easily reversible to whatever had formed it. For instance, when iron is exposed to air and moisture for a period of time, it will eventually turn into rust; and that's a chemical change.

Rust in the above instance is formed from iron through a reaction termed oxidation. In this case, the formed rust cannot be reverted into what formed it (iron).

Please read more on the Chemical Properties of Matter explained with Examples here.

Note: The properties that are attributed to a chemical change are termed chemical properties.

Various substances have got their respective chemical properties; for instance, oxidition and flammability.

You can read on the Physical and Chemical Properties of Acids here.


The table below shows the differences between a physical change and a chemical change:

Physical Change

Chemical Change

It is easily reversible

It is not easily reversible

No new substance is formed

A new substance is formed

The change is not accompanied with a new chemical formula.
Please read on Emperical Formula and its Calculation here.

This change is accompanied with a new chemical formula.
You can read on Molecular Formula and Relative Molecular Mass here.

The original matter can be recovered by using a separation technique.
Please read more on the various Separation Techniques here.

The original matter cannot be recovered through a separation technique

It results to a change in the physical properties of the substance. For example, color and shape.
Please read on the Physical Properties of Metals here.

It results to a change in the chemical composition and properties of the new substance

Physical change only result in the rearrangement of molecules but the internal composition of the substance remains the same
Please read on the Concept of Matter here.

Chemical change results in the formation of a new substance with an entirely different chemical composition

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Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 7 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate.


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Amazing facts in Chemistry

The only letters that failed to appear on the periodic table are letters:

J     &     Q

Gold and copper are the only two non-silvery colored metals.

Please read some interesting facts about gold here

Copper is the only metal that is naturally antibacterial. This is why you would see some children utilize 'copper' water bottles in schools

Water actually freezes faster when it’s warm than when it’s cold

Most element in their pure state exists physically in different forms. For instance, pure carbon can exist as both diamond and graphite. This phenomenon is called allotropy.

Please read on modification of Dalton's atomic theory here.

If you pour a handful of salt into a full glass of water, the water level will go down rather than overflowing the glass.

Similarly, if you mix half liter of water and half litre of alcohol, the total volume of the liquid will be les than one litre


NOTABLE POINTS IN Chemistry