Chemistry Quiz

What does A_r represent in chemistry?

• Atomic radius

• Atomic mass

• Relative atomic mass

• Atomic number

What does M_r represent in chemistry?

• Molar radius

• Molar mass

• Molecular radius

• Molecular mass

What is the relationship between a mole and M_r?

How is the mole concept used in calculations?

• To calculate the volume of a substance

• To calculate the number of particles in a given mass of a substance

• To calculate the energy change in a reaction

• To calculate the pressure of a gas

What does the atomic number of an element represent?

• The total mass of neutrons and protons in an atom

• The number of neutrons in an atom's nucleus

• The number of protons in an atom's nucleus

• The relative atomic mass of an element

What is the relative atomic mass (A_r) of an element?

• The number of protons in an atom's nucleus

• The number of neutrons in an atom's nucleus

• The total mass of neutrons in an atom

• The total mass of neutrons and protons in an atom's nucleus

What particles in the nucleus of an atom have a mass of 1?

• Electrons and protons

• Protons and neutrons

• Neutrons and electrons

• Protons only

What does A_r represent in the context of the periodic table?

• Atomic radius

• Atomic reactivity

• Relative atomic mass

• Atomic revolution

How can you find the A_r of an element using the periodic table?

• By locating the element's symbol

• By finding the element's atomic (proton) number

• By looking at the "big number" for that element

• By calculating the number of neutrons

What is the A_r of the element Beryllium (Be)?

• 4

• 9

• 7

• 24