Chemistry Final

Front

Which group on the periodic table contains the noble gases?

Back

Group 18 contains the noble gases, which are characterized by their lack of reactivity due to having a full valence shell.

Front

What device converts electrical energy into mechanical energy?

Back

An electric motor converts electrical energy into mechanical energy, allowing for the operation of various machines.

Front

What explains the formation of MgCl₂ when magnesium reacts with chlorine?

Back

Magnesium loses two electrons, and each chlorine atom gains one electron, resulting in the formation of MgCl₂.

Front

In the reaction C + O₂ → CO₂, how many oxygen molecules are needed for 3 carbon atoms?

Back

3 oxygen molecules (O₂) are needed to fully react with 3 carbon atoms to produce CO₂.

Front

What characterizes an exothermic reaction?

Back

In an exothermic reaction, the reactants have more total bond energy than the products, resulting in the release of energy.

Front

What is the definition of an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a chemical bond?

Back

A chemical bond is a lasting attraction between atoms that enables the formation of chemical compounds.

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.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.