Gr 10 Physical Sciences Ch 4: Writing formulae
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Questions and Answers

What is the chemical formula for acetate?

  • \( ext{C}_2 ext{H}_3 ext{COO}^- \)
  • \( ext{CH}_3 ext{CO}^- \) (correct)
  • \( ext{CH}_3 ext{COOH} \)
  • \( ext{CH}_3 ext{COO}^+ \)

    • What is the charge of the oxide anion?

  • +2
  • -2 (correct)
  • -1
  • +1

    • What is the chemical formula for the sulphate anion?

  • \( ext{S}_2 ext{O}_4^{2-} \)
  • \( ext{SO}_3^{2-} \)
  • \( ext{SO}_2^{2-} \)
  • \( ext{SO}_4^{2-} \) (correct)

    • What is the chemical formula for the ammonium cation?

    <p>( ext{NH}_4^+ )</p> Signup and view all the answers

    Why is it essential to balance the total positive and negative charges when writing the formula of a compound?

    <p>To ensure the compound is electrically neutral</p> Signup and view all the answers

    What is the purpose of chemical formulae in chemistry?

    <p>To provide a concise way to represent the composition of compounds</p> Signup and view all the answers

    What is the chemical formula for the phosphate anion?

    <p>( ext{PO}_4^{3-} )</p> Signup and view all the answers

    What is the chemical formula for the nitrate anion?

    <p>( ext{NO}_3^- )</p> Signup and view all the answers

    What is the first step in writing a chemical formula?

    <p>Identify the cation and anion</p> Signup and view all the answers

    What is the purpose of balancing the charges in a chemical formula?

    <p>To ensure the stability of the compound</p> Signup and view all the answers

    What is the valency of an ion?

    <p>The number of electrons it can gain or lose</p> Signup and view all the answers

    What is the criss-cross method used for?

    <p>Writing chemical formulae</p> Signup and view all the answers

    What unit is used to calculate the formula mass of a compound?

    <p>Atomic mass unit (amu)</p> Signup and view all the answers

    What is the result of combining ions in a chemical formula?

    <p>An electrically neutral compound</p> Signup and view all the answers

    What information does the oxidation state of an ion provide?

    <p>Its charge</p> Signup and view all the answers

    What is the purpose of using subscripts in a chemical formula?

    <p>To indicate the number of each type of ion</p> Signup and view all the answers

    What is the primary function of chemical formulae in chemistry?

    <p>To provide a concise way to represent the composition of compounds</p> Signup and view all the answers

    Which anion has the chemical formula ( ext{HCO}_3^- )?

    <p>Hydrogen carbonate</p> Signup and view all the answers

    What is the crucial step when writing the formula of a compound?

    <p>Balancing the total positive and negative charges</p> Signup and view all the answers

    Which cation has the chemical formula ( ext{NH}_4^+ )?

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

    What is the purpose of understanding common anions and cations?

    <p>To write chemical formulae</p> Signup and view all the answers

    What is the charge of the chromate anion?

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

    Why are chemical formulae useful in chemistry?

    <p>They offer a concise way to represent the composition of compounds</p> Signup and view all the answers

    What is the formula of the thiosulphate anion?

    <p>( ext{S}_2 ext{O}_3^{2-} )</p> Signup and view all the answers

    What is the primary goal of balancing the charges when writing a chemical formula?

    <p>To result in an electrically neutral compound</p> Signup and view all the answers

    What determines the number of ions needed to balance the charges in a chemical formula?

    <p>The valency of the ions</p> Signup and view all the answers

    What is the result of swapping the charges of the ions and using them as subscripts for the opposite ion in the criss-cross method?

    <p>A chemical formula with balanced charges</p> Signup and view all the answers

    What is the unit used to calculate the formula mass of a compound?

    <p>Atomic mass units (amu)</p> Signup and view all the answers

    What information does the oxidation state of an ion provide?

    <p>The charge of the ion</p> Signup and view all the answers

    What is the purpose of using subscripts in a chemical formula?

    <p>To indicate the number of each type of ion</p> Signup and view all the answers

    What determines the stability of a compound?

    <p>The balance of the charges</p> Signup and view all the answers

    What is the term for the combining capacity of an ion?

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

    Which of the following anions has a charge of 2-?

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

    What is the consequence of not balancing the total positive and negative charges in a chemical formula?

    <p>The compound becomes electrically charged</p> Signup and view all the answers

    Which of the following statements is NOT true about common anions and cations?

    <p>They are always electrically neutral</p> Signup and view all the answers

    What is the primary purpose of understanding common anions and cations?

    <p>To write chemical formulae</p> Signup and view all the answers

    What is the result of combining a cation with an anion in a chemical formula?

    <p>A compound with a neutral charge</p> Signup and view all the answers

    Which of the following is NOT a common anion?

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

    What determines the number of ions needed to balance the charges in a chemical formula?

    <p>The charge of the ion</p> Signup and view all the answers

    What is the importance of using subscripts in a chemical formula?

    <p>To indicate the number of ions needed to balance the charges</p> Signup and view all the answers

    What is the purpose of identifying the cation and anion in writing a chemical formula?

    <p>To balance the charges of the ions</p> Signup and view all the answers

    What is the result of not balancing the charges in a chemical formula?

    <p>The compound would not exist in a stable form</p> Signup and view all the answers

    What is the term for the process of adjusting the number of cations and anions to balance the charges?

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

    What is the purpose of using the criss-cross method in writing chemical formulae?

    <p>To write the chemical formula of a compound</p> Signup and view all the answers

    What is the unit used to express the formula mass of a compound?

    <p>Atomic mass units (amu)</p> Signup and view all the answers

    What information does the oxidation state of an ion provide?

    <p>The charge of the ion</p> Signup and view all the answers

    What determines the number of ions needed to balance the charges in a chemical formula?

    <p>The charge of the ions</p> Signup and view all the answers

    What is the primary goal of balancing the charges when writing a chemical formula?

    <p>To ensure the stability of the compound</p> Signup and view all the answers

    What is the fundamental principle underlying the formation of chemical compounds from ions?

    <p>The total positive and negative charges must be balanced.</p> Signup and view all the answers

    Which of the following statements about chemical formulae is true?

    <p>Chemical formulae can be used to represent the composition of all types of compounds.</p> Signup and view all the answers

    What is the primary purpose of understanding common anions and cations in chemistry?

    <p>To write chemical formulae for compounds.</p> Signup and view all the answers

    What is the consequence of not balancing the total positive and negative charges in a chemical formula?

    <p>The compound will be unstable.</p> Signup and view all the answers

    Which of the following is a characteristic of a chemical formula?

    <p>It represents the composition of a compound.</p> Signup and view all the answers

    What is the importance of using subscripts in a chemical formula?

    <p>To indicate the number of atoms of an element in the compound.</p> Signup and view all the answers

    What is the primary goal of balancing the charges when writing a chemical formula?

    <p>To ensure the compound is electrically neutral.</p> Signup and view all the answers

    Which of the following is a common misconception about chemical formulae?

    <p>Chemical formulae can be used to represent the physical properties of a compound.</p> Signup and view all the answers

    What is the primary consideration when combining ions in a chemical formula?

    <p>The total positive charge balancing the total negative charge</p> Signup and view all the answers

    Why is the concept of valency important in writing chemical formulae?

    <p>It indicates the ion's ability to form a full outer shell</p> Signup and view all the answers

    What is the purpose of using subscripts in a chemical formula?

    <p>To show the ratio of ions in the compound</p> Signup and view all the answers

    What happens when the charges of the ions are not balanced in a chemical formula?

    <p>The compound does not exist</p> Signup and view all the answers

    What is the purpose of calculating the formula mass of a compound?

    <p>To determine the relative mass of compounds in reactions</p> Signup and view all the answers

    What is the criss-cross method used to achieve?

    <p>To write the chemical formula of a compound</p> Signup and view all the answers

    What is the term for the process of adjusting the number of cations and anions to balance the charges?

    <p>Charge balancing</p> Signup and view all the answers

    What is the result of understanding the oxidation state of an ion?

    <p>Knowing the ion's ability to gain or lose electrons</p> Signup and view all the answers

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