First Semester Exam

Front

What is the formula for the compound formed by Al³⁺ and O^2-?

Back

Al₂O₃

Front

What is the formula for the compound formed by K¹⁺ and S^2-?

Back

K₂S

Front

What is the formula for copper(I) sulfate?

Back

Cu₂SO₄

Front

What is necessary to calculate the average atomic mass of an element?

Back

The relative abundance of each isotope

Front

How do you calculate the average atomic mass of an element?

Back

By multiplying the mass of each isotope by its relative abundance and summing the results

Front

What is an ionic bond?

Back

A chemical bond formed between two ions with opposite charges.

Front

Define atomic mass unit (amu).

Back

A unit of mass used to express atomic and molecular weights, defined as one twelfth of the mass of a carbon-12 atom.

Front

What is the significance of the atomic number?

Back

It represents the number of protons in an atom and determines the element's identity.

Front

What is a cation?

Back

A positively charged ion that has lost one or more electrons.

Front

What is an anion?

Back

A negatively charged ion that has gained one or more electrons.