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Questions and Answers
What is the chemical formula for carbon tetrachloride?
What is the chemical formula for carbon tetrachloride?
According to the rules for writing a chemical formula, which element is written first in a compound of a metal and a non-metal?
According to the rules for writing a chemical formula, which element is written first in a compound of a metal and a non-metal?
When a compound consists of polyatomic ions, how is the number of ions present in the compound indicated?
When a compound consists of polyatomic ions, how is the number of ions present in the compound indicated?
What is the chemical formula for aluminium oxide?
What is the chemical formula for aluminium oxide?
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In magnesium chloride, how many chloride ions are present for each magnesium ion?
In magnesium chloride, how many chloride ions are present for each magnesium ion?
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What is the combining power of an element known as?
What is the combining power of an element known as?
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How can the valency of an element be represented according to the text?
How can the valency of an element be represented according to the text?
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What does the subscript 4 in OH4 represent?
What does the subscript 4 in OH4 represent?
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Which term is used to describe a group of atoms carrying a charge?
Which term is used to describe a group of atoms carrying a charge?
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In Table 3.5, what does the Roman numeral in brackets represent for certain elements?
In Table 3.5, what does the Roman numeral in brackets represent for certain elements?
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What is the combining power (or capacity) of an element known as?
What is the combining power (or capacity) of an element known as?
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How can the valency of an element be thought of according to the text?
How can the valency of an element be thought of according to the text?
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What does a Roman numeral in brackets represent for certain elements?
What does a Roman numeral in brackets represent for certain elements?
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How is the number of ions present in a compound indicated when it consists of polyatomic ions?
How is the number of ions present in a compound indicated when it consists of polyatomic ions?
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Which term describes a group of atoms carrying a charge?
Which term describes a group of atoms carrying a charge?
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What is the correct chemical formula for calcium oxide?
What is the correct chemical formula for calcium oxide?
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In the formula for magnesium chloride (MgCl2), why are there two chloride ions for each magnesium ion?
In the formula for magnesium chloride (MgCl2), why are there two chloride ions for each magnesium ion?
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Why is the chemical formula for aluminium oxide simplified to Al2O3 instead of Al2O2?
Why is the chemical formula for aluminium oxide simplified to Al2O3 instead of Al2O2?
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What rule must be followed when writing a chemical formula for a compound consisting of a metal and a non-metal?
What rule must be followed when writing a chemical formula for a compound consisting of a metal and a non-metal?
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What is the purpose of using brackets when writing a chemical formula for compounds formed with polyatomic ions?
What is the purpose of using brackets when writing a chemical formula for compounds formed with polyatomic ions?
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Study Notes
Chemical Formulae Rules
- The chemical formula for carbon tetrachloride is CCl4.
- In a compound of a metal and a non-metal, the metal is written first.
Polyatomic Ions
- When a compound consists of polyatomic ions, the number of ions present is indicated by a subscript outside the brackets.
Valency and Combining Power
- The combining power of an element is known as its valency.
- The valency of an element can be represented by a Roman numeral in brackets or thought of as the number of electrons an element gains or loses to form a stable ion.
Formulae for Compounds
- The chemical formula for aluminium oxide is Al2O3.
- The chemical formula for calcium oxide is CaO.
- The chemical formula for magnesium chloride is MgCl2, with two chloride ions for each magnesium ion.
Writing Chemical Formulae
- When writing a chemical formula for a compound consisting of a metal and a non-metal, the metal must be written first.
- When writing a chemical formula for compounds formed with polyatomic ions, brackets are used to indicate the polyatomic ion, and a subscript outside the brackets indicates the number of ions present.
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Description
This quiz covers the formation of ions, symbols and combining capacity of elements, and the concept of valency in chemistry. It explores how the valency of an element determines its ability to combine with atoms of other elements to form chemical compounds.
