Chemistry

Elements: Characteristics of Elements

len Alfred Ajibola - Wed, 20th November, 2019 @ 07:30

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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What are Elements?

Everything in our world is composed of one or more elements. For instance:

The atmosphere is composed of elements like nitrogen, oxygen and noble gases.
Please read on the Constituents of the Atmosphere here.

Humans are composed of elements like carbon (C), iron (Fe), calcium (Ca), sodium (Na), chlorine (Cl) and so on
Please read on Macro-Nutrients in Humans, their Sources, Functions and Deficiencies here.

Various materials and objects are made of elements. For instance:

  • Plastic and Nylons contain the elements carbon, hydrogen, sulphur, chlorine and so on.
  • Sand contain the elements silicon and oxygen.
  • Cotton is made up of elements like oxygen, carbon, hydrogen, nitrogen and so on.

In chemistry, an element may be defined as the simplest form of a substance that cannot be broken down by chemical means.

Consider the instance below:

When one attempts to split a pure gold (element) into particles (or tiny pieces), all they see is the same thing (gold) on each particle, nothing else.

Please read on Interesting facts about Gold here.

Elements are naturally occurring in the universe. In fact, life is present on earth because of the type of elements found in it.

On other planets, the elements that are necessary for life are not present in sufficient quantities. For instance, these other planets will either have little or no oxygen in their atmospheres.

Please read on the Planets and their Characteristics here.

Think about the followings for a moment:


Characteristics and Notable Points on Elements

Before we list on some notable points concerning elements, it's a good idea to understand their careful arrangement on the periodic table.

Periodic Table - Len Academy

  1. The periodic table is a table that shows all the elements present on earth.
    Please read more on the Periodic Table and Classification of Elements here.
  2. Each element has a unique name and chemical symbol. They are displayed in an organized manner on the periodic table.
  3. Each elements have got its unique atomic number BUT certain elements called isotopes have got the same atomic number.

    Atomic number is defined as the number of protons in the nucleus of an atom.

    Isotopy is a phenomenon whereby atoms of the same element have the same atomic number different mass number.
    Please read more on Dalton's Atomic Theory and its Modification here.

    It is the number(s) of protons that defines or make unique an element.

    For instance, Hydrogen is hydrogen simply because it has only one proton. Oxygen is oxygen because it has eight protons.

  4. Most elements have got their unique mass number BUT certain elements called isobars have got the same mass number.

    Isobars are elements that have different atomic number but same mass number.

    Please read more on Dalton's Atomic Theory and its Modification in the above link for further explanations and examples.

  5. All pure elements are pure substance. This will imply that elements cannot be splitted into something different. For instance, if you attempt to split pure elemental gold (Au), all you'll keep seeing within it is the same gold; nothing else.
    Please read on Mixtures and their Characteristics here.
  6. Metallic elements are always found in their impure state. They are termed as ores (in their impure state). Metallic ores can be separated via electrolysis.
    Please read on an Introduction to Electrolysis here.
  7. There are 118 known elements at at present. There is an ongoing research to discover or create the 120th element; and once it’s verified, the periodic table will be altered.

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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