Chemistry Exam 2024

Front

What is the symbol for electromagnetic energy that is known as gamma radiation?

Back

Gamma (γ)

Front

Who proposed the atomic theory stating that atoms are indivisible?

Back

John Dalton

Front

What is a sign of a chemical reaction that involves a change in temperature?

Back

Change in temperature is a sign of a chemical reaction.

Front

How many moles are present in 32.3 grams of carbon dioxide (CO2) if the molar mass is 44 g/mol?

Back

0.73 moles

Front

What is the correct representation of hydrogen gas in a chemical equation?

Back

H₂

Front

What is the definition of a mole in chemistry?

Back

A mole is a unit that measures the amount of substance, defined as containing exactly 6.022 x 10²³ particles.

Front

What is the molar mass of carbon dioxide (CO2)?

Back

The molar mass of CO2 is 44 g/mol.

Front

What is the principle behind the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

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.

Front

What is the pH scale used for?

Back

The pH scale measures the acidity or basicity of a solution.