Chemical Symbols and Polyatomic Ions Quiz
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Questions and Answers

Which element has the symbol Mg2+?

  • Magnesium (correct)
  • Calcium
  • Zinc
  • Iron (II)

    • What is the correct formula for iron (III) nitride?

  • FeNO3
  • Fe2N
  • FeN
  • Fe3N2 (correct)

    • In compounds formed with polyatomic ions, where should the ion be placed in the chemical formula?

  • At the end of the formula
  • In a bracket before writing the number to indicate the ratio (correct)
  • After the non-metal in the formula
  • At the start of the formula

    • What is the valency of Copper (II) in ionic compounds?

    <p>2+</p> Signup and view all the answers

    What is the ratio by mass of magnesium to sulfur in magnesium sulphide?

    <p>3:4</p> Signup and view all the answers

    How can valency be best described in relation to chemical compounds?

    <p>Valency is the combining power of an element that determines how it combines with other elements in a compound.</p> Signup and view all the answers

    What would be the correct chemical formula for an octopus holding 8 humans based on the analogy provided?

    <p>O8H8</p> Signup and view all the answers

    In the context of chemical compounds, how does valency relate to the number of arms or hands of an atom?

    <p>Valency represents the number of arms or hands an atom has for bonding with other atoms.</p> Signup and view all the answers

    What is the correct order of writing when forming chemical formulas for compounds?

    <p>Write the symbol of cation first, followed by the symbol of anion</p> Signup and view all the answers

    In magnesium chloride, why is the formula written as MgCl2?

    <p>There are two magnesium ions for each chloride ion</p> Signup and view all the answers

    Why is it necessary to use brackets in the formula for calcium hydroxide?

    <p>To represent multiple hydroxyl groups attached to one calcium atom</p> Signup and view all the answers

    How are the charges on ions represented in chemical formulas?

    <p>By placing charges outside the brackets</p> Signup and view all the answers

    Study Notes

    Chemical Compounds and Formulas

    • Mg²⁺ is the symbol for magnesium ion.

    Chemical Formula for Iron (III) Nitride

    • The correct formula for iron (III) nitride is FeN.

    Placement of Polyatomic Ions in Formulas

    • In compounds formed with polyatomic ions, the ion should be placed after the symbol of the metal.

    Valency of Copper (II)

    • The valency of Copper (II) in ionic compounds is 2.

    Ratio of Magnesium to Sulfur in Magnesium Sulphide

    • The ratio by mass of magnesium to sulfur in magnesium sulphide is 1:1.

    Valency in Relation to Chemical Compounds

    • Valency can be best described as the number of electrons an atom gains or loses to form a stable compound.

    Valency Analogy: Octopus Holding Humans

    • The correct chemical formula for an octopus holding 8 humans would be Octo(Human)₈.

    Valency and Atomic Arms or Hands

    • Valency relates to the number of arms or hands of an atom, representing the number of electrons an atom can gain or lose to form a stable compound.

    Order of Writing Chemical Formulas

    • The correct order of writing chemical formulas for compounds is to write the symbol of the metal first, followed by the symbol of the non-metal.

    Magnesium Chloride Formula

    • The formula for magnesium chloride is written as MgCl₂ because magnesium has a valency of 2 and chlorine has a valency of 1.

    Brackets in Calcium Hydroxide Formula

    • Brackets are necessary in the formula for calcium hydroxide (Ca(OH)₂) to indicate that the OH group is a single unit.

    Representation of Ion Charges in Formulas

    • The charges on ions are represented in chemical formulas by writing the charge of the ion in superscript, e.g., Mg²⁺.

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    Description

    Test your knowledge of chemical symbols for elements and polyatomic ions. Learn the symbols for metals, nonmetals, and polyatomic ions with varying valencies.

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