Chemistry Semester Exam

Front

What is the smallest particle of an element that retains its identity?

Back

Atom

Front

What does the gold(III) ion (Au3+) indicate about the number of electrons compared to a neutral gold atom?

Back

Gold(III) has three fewer electrons than a neutral gold atom.

Front

What happens to the volume of an ideal gas as it is cooled to absolute zero (0 K) at constant pressure?

Back

The volume decreases until it becomes zero at 0 K.

Front

What is the chemical formula for water?

Back

H₂O

Front

What temperature is equivalent to absolute zero (0 K)?

Back

-273.15°C

Front

What are quarks?

Back

Quarks are fundamental particles that combine to form protons and neutrons.

Front

Define an ion.

Back

An ion is an atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What is the difference between a cation and an anion?

Back

A cation is a positively charged ion, while an anion is a negatively charged ion.

Front

What is the principle behind the conservation of mass in chemical reactions?

Back

The total mass of reactants equals the total mass of products in a chemical reaction.

Front

What is the significance of the atomic number of an element?

Back

The atomic number represents the number of protons in the nucleus of an atom, determining the element's identity.