Chem -Final Exam (Fall 24)

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during the reaction.

Front

What is a chemical property?

Back

A chemical property is a characteristic of a substance that can only be observed during a chemical reaction, such as reactivity with acids.

Front

How many valence electrons does Indium (In) have?

Back

Indium has 3 valence electrons.

Front

What is the formula for tetraphosphorus nonasulfide?

Back

The formula is P4S9.

Front

What is a beaker used for?

Back

A beaker is a cylindrical container used for mixing, stirring, and heating liquids in a laboratory.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the law of conservation of mass is upheld, meaning that matter is neither created nor destroyed in a chemical reaction.

Front

What is the difference between a chemical and a physical property?

Back

A chemical property describes a substance's ability to undergo a chemical change, while a physical property can be observed without changing the substance's chemical identity.

Front

What is the general formula for hydrocarbons?

Back

The general formula for alkanes (a type of hydrocarbon) is CnH2n+2.

Front

What is the role of valence electrons in chemical bonding?

Back

Valence electrons are involved in forming bonds between atoms; they determine how an atom can bond with others.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons between atoms.