Chem I Hon Semester 1 Exam Review-SY25

Front

What is Hund's Rule?

Back

Hund's Rule states that orbitals of equal energy are each occupied by one electron before any is occupied by a second electron, and all electrons in singly occupied orbitals must have the same spin.

Front

What are valence electrons?

Back

Valence electrons are electrons located on the outer energy level of an atom.

Front

How many significant figures does the number 1740200 have?

Back

The number 1740200 has 5 significant figures.

Front

What are the vertical columns in the Periodic Table called?

Back

The vertical columns in the Periodic Table are called groups.

Front

Convert 42 L to mL.

Back

42 L = 42,000 mL.

Front

What is the Pauli Exclusion Principle?

Back

The Pauli Exclusion Principle states that no two electrons in an atom can have the same set of four quantum numbers.

Front

What is the Aufbau Principle?

Back

The Aufbau Principle states that electrons occupy the lowest energy orbitals first before filling higher energy levels.

Front

Define atomic number.

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement that represents 6.022 x 10^23 particles, atoms, or molecules.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.