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^+ ) (A)</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 (A)</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 (A)</p> Signup and view all the answers

What is the chemical formula for the phosphate anion?

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

What is the chemical formula for the nitrate anion?

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

What is the first step in writing a chemical formula?

<p>Identify the cation and anion (D)</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 (A)</p> Signup and view all the answers

What is the valency of an ion?

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

What is the criss-cross method used for?

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

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

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

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

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

What information does the oxidation state of an ion provide?

<p>Its charge (A)</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 (B)</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 (C)</p> Signup and view all the answers

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

<p>Hydrogen carbonate (A)</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 (C)</p> Signup and view all the answers

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

<p>Ammonium (D)</p> Signup and view all the answers

What is the purpose of understanding common anions and cations?

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

What is the charge of the chromate anion?

<p>-2 (A)</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 (C)</p> Signup and view all the answers

What is the formula of the thiosulphate anion?

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

What information does the oxidation state of an ion provide?

<p>The charge of the ion (D)</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 (A)</p> Signup and view all the answers

What determines the stability of a compound?

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

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

<p>Valency (D)</p> Signup and view all the answers

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

<p>Carbonate (A), Sulphate (D)</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 (B)</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 (D)</p> Signup and view all the answers

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

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

Which of the following is NOT a common anion?

<p>Water (B)</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 (C)</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 (C)</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 (C)</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 (B)</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 (D)</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 (D)</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) (C)</p> Signup and view all the answers

What information does the oxidation state of an ion provide?

<p>The charge of the ion (A)</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 (C)</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 (B)</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. (B)</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. (D)</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. (D)</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. (C)</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. (B)</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. (B)</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. (C)</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. (B)</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 (D)</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 (B)</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 (B)</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 (B)</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 (D)</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 (A)</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 (C)</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 (C)</p> Signup and view all the answers

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