Writing and naming compounds

What is the compound formula for K⁺ and S²⁻ ions?

• K₂S

• KS

• K₃S₂

• K₂S₃

What is the importance of chemical nomenclature?

• It provides a systematic way to name compounds, ensuring clear communication in chemistry.

• It is used to classify elements based on their atomic number.

• It helps in predicting the physical properties of substances.

• It is a method for determining the molecular weight of compounds.

What is the name of the covalent compound CO₂?

• Carbon monoxide

• Carbon dioxide

• Carbon trioxide

• Dicarbon oxide

What is a polyatomic ion?

• A charged ion composed of two or more atoms bonded together.

• An ion that contains only one atom.

• A neutral molecule with no charge.

• An ion that is formed by the loss of electrons from a single atom.

What is the name of the compound with the formula NH₃?

• Ammonia

• Hydrazine

• Nitrogen Dioxide

• Urea

What is the difference between ionic and covalent compounds?

• Ionic compounds are formed by the sharing of electrons, while covalent compounds are formed by the transfer of electrons.

• Ionic compounds are formed by the transfer of electrons, while covalent compounds are formed by the sharing of electrons.

• Ionic compounds are formed by the combination of metals, while covalent compounds are formed by the combination of nonmetals.

• Ionic compounds are formed in gaseous states, while covalent compounds are formed in solid states.

What is the formula for calcium sulfate?

• CaSO₄

• CaSO₃

• Ca₂SO₄

• CaS

How many atoms are in the chemical formula Al₂(SO₄)₃?

• 14

• 15

• 16

• 17

How do you determine the charge of a compound?

• The total charge of a compound must equal zero; balance the positive and negative charges of the ions.

• The charge of a compound is determined by the number of atoms present.

• The charge is calculated by adding the atomic masses of the elements in the compound.

• The charge is irrelevant as compounds are always neutral.

Define a compound in chemistry.

• A substance formed when two or more elements are chemically bonded together.

• A mixture of two or more substances that retain their individual properties.

• A single element that cannot be broken down into simpler substances.

• A solution where one substance is dissolved in another.