Semester exam 24 review part 1

Front

What is a chemical reaction?

Back

A process where reactants transform into products, involving the rearrangement of atoms and changes in energy.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, the total mass of reactants equals the total mass of products.

Front

What does pH measure?

Back

The acidity or alkalinity of a solution, on a scale from 0 to 14.

Front

What is an exothermic reaction?

Back

A reaction that releases energy, usually in the form of heat.

Front

What is an endothermic reaction?

Back

A reaction that absorbs energy from its surroundings.

Front

What are valence electrons?

Back

Electrons in the outermost shell of an atom that determine its bonding behavior.

Front

How do you determine if a chemical equation is balanced?

Back

By ensuring that the number of atoms of each element is the same on both sides of the equation.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Front

What is a catalyst?

Back

A substance that increases the rate of a chemical reaction without being consumed in the process.

Front

What is the significance of the pH scale?

Back

It helps to determine the acidity or alkalinity of a solution, which affects chemical reactions.