Chemistry End of Term 11/19/2024

Front

What coefficients are needed to balance the equation: ___Al + ___ O₂ ---> 2Al₂O₃?

Back

4, 3

Front

This group of elements sit along a stair step line on the periodic table and have properties of both metals and nonmetals. What are they called?

Back

Metalloids

Front

Identify the following chemical reaction: 2 NaBr + 1 Ca(OH)₂ ---> 1 CaBr₂ + 2 NaOH.

Back

Double displacement

Front

What are the vertical columns in the Periodic Table called?

Back

Groups

Front

What is the molar mass of C₂H₄O₂?

Back

60g

Front

What is the definition of a chemical reaction?

Back

A process that leads to the transformation of one set of chemical substances to another.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed.

Front

What is the difference between an ionic bond and a covalent bond?

Back

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

Front

What is the pH scale used for?

Back

To measure the acidity or basicity of a solution.

Front

What is the periodic law?

Back

The properties of elements are periodic functions of their atomic numbers.