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Chemical Formulae Writing Exercise

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Questions and Answers

What does the chemical formula of a compound represent?

Physical state of the compound

Atomic number of the elements in the compound

Mass ratio of the elements in the compound

Symbols and combining capacity of the elements in the compound (correct)

How can valency help determine chemical compound formation?

By indicating the physical properties of the elements

By revealing the mass ratio of the elements

By stating the atomic weight of each element

By showing how atoms of different elements combine (correct)

How is valency related to chemical bonding?

Valency indicates the boiling points of elements

Valency predicts the density of compounds

Valency determines the color of compounds

Valency shows the reactivity of elements (correct)

What aspect of compounds does Table 3.5 provide information about?

Symbols and combining capacity of elements Signup and view all the answers

What information can be inferred from Table 3.6 about ions?

Their valencies Signup and view all the answers

What is the correct order of writing the symbols for elements and their valencies when writing chemical formulae?

Valency of each element followed by the symbol of the element Signup and view all the answers

Why do we criss-cross the charges of cations and anions when writing chemical formulas?

To ensure overall charge neutrality in the compound Signup and view all the answers

In magnesium chloride (MgCl2), how many chloride ions are present for each magnesium ion?

Two chloride ions for each magnesium ion Signup and view all the answers

Why is the formula for calcium hydroxide written as Ca(OH)2 and not CaOH2?

To indicate the presence of two hydroxyl groups Signup and view all the answers

Which compound has the formula NaNO3?

Sodium nitrate (NaNO3) Signup and view all the answers

What does the formula Al2O3 represent?

Aluminum oxide Signup and view all the answers

What is the correct order to write the elements in a chemical formula when a compound consists of a metal and a non-metal?

Metal first, then non-metal Signup and view all the answers

Which of the following ions is represented correctly with its symbol?

Sulphate - SO4- Signup and view all the answers

In compounds formed with polyatomic ions, what is the rule regarding enclosing the ion in a bracket?

Only enclose when the number of polyatomic ions is more than one Signup and view all the answers

Which of the following compounds is a binary compound?

Sodium Chloride (NaCl) Signup and view all the answers

When writing chemical formulas, what must be ensured about the valencies or charges on the ions?

They must balance each other out Signup and view all the answers

Which one of these elements can show more than one valency?

Iron Signup and view all the answers