Types of Mixture: Homogenous and Heterogeneous Mixtures

len Alfred Ajibola - Sat, 15th February, 2020 @ 19:32

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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Types of Mixture:

A mixture can be generally categorized into 2 types. These are:

  • Homogeneous Mixture
  • Heterogeneous Mixture

Please read on the Introduction to Mixtures and their Characteristics here.

You can read on the Separation of Mixtures here.

1. Homogenous Mixtures

The prefix homo means sameness. A mixture is considered to be homogeneous when it has a uniform composition and appearance all through. For instance, the mixture of salt and water (saline) is a homogeneous mixture because the salt dissolves completely in water.

Note: The liquid forms of homogenous mixtures whose particles are completely dissolved are referred to as solutions. The solid to be dissolved in a solution is referred to as the solute while the liquid is termed the solvent. In short, the solvent dissolves the solute to form solution which is always a homogenous mixture.

The diagram below shows the homogenous mixture of a sugar solution:
Homogenous mixture of Sugar Solution - Len Academy

You can read on Electrolytes and Ions here.

In chemistry, a colloid is a homogeneous mixture with intermediate sized particles. It lies in the borderline between a solution and a suspension.

Although the solution of a homogeneous mixture appears to be physically pure, they are still impure because they are mixtures. Mixtures are not pure substances but elements are.

Please read on Elements and their Characteristics here.

Other examples of homogenous mixtures include:

  • Air: Air is a mixture of gases. The gases that make up air include nitrogen, oxygen, argon, carbon(IV)oxide, neon, Krypton, helium, xenon, hydrogen, and water vapour.
    You can read on Air (Atmosphere) and its Composition here.
  • Alloys: An alloy is a metal made formed from the combination of a metal and another element(s). In short, it is a mixture of a metal and another element. Examples of alloys include, steel (iron and carbon), brazz (copper + zinc), bronze (copper + tin), duralumin (aluminum + copper), solder (tin + lead + antimony) and so on.
    Please read on Metals and their Physical Properties here.
  • Plastics: Plastic is a mixture of synthetic compounds. The elements that makes up plastic include carbon, hydrogen, oxygen, nitrogen, chlorine and sulphur. A plastic is considered a polymeric material because of its long chain.
    You can read on the Introduction to Organic Chemistry and Hydrocarbons here.
  • Cement: Cement is considered as a homogenous mixture. It is made from elements like calcium, silicon, aluminium, oxygen and iron.
  • Bitumen: This is one of the the products obtained from the fractional distillation of petroleum. It is a homgenous mixture comprising mainly of carbon and hydrogen. Other elements that makes up bitumen include sulphur, nitrogen, oxygen and even metals.
  • Wood: Wood is a homogenous mixture comprising of elements like carbon, hydrogen, oxygen, calcium, potassium, sulphur, nitrogen and magnesium.
    Please read on Hardwood and Softwood here.

2. Heterogenous Mixtures

A mixture is said to be heterogeneous if it's composed of different substances that do not dissolve. The substances that make up a heterogeneous mixture are often visible to the eye.

A suspension is a heterogeneous mixture comprising of large sized particles. The particles can be seen to settle down or sediment below the liquid. An instance of suspension is a mixture of water and sand. This suspension (mixture) can be separated via a technique termed sedimentation and decantation. The image below illustrates this:
Heterogeneous mixture of Sand and Water - Len Academy

Examples of heterogeneous mixtures include:

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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