Chapter Three General Chemistry 2024

Front

How many moles are in 3.01 x 10^22 atoms of magnesium?

Back

0.05 moles

Front

How many neutrons does an atom of the isotope Neon-22 have?

Back

12 neutrons

Front

In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.

Back

Atoms

Front

How many atoms of carbon are in 6.00g of carbon?

Back

3.01 x 10^23 atoms C

Front

Neutrons are found in the...

Back

Nucleus

Front

What is the definition of a mole in chemistry?

Back

A mole is a unit that measures the amount of substance, defined as exactly 6.022 x 10^23 particles (atoms, molecules, etc.).

Front

What is the atomic number of an element?

Back

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

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

What is the difference between isotopes?

Back

Isotopes are variants of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the formula to calculate the number of atoms from moles?

Back

Number of atoms = moles x 6.022 x 10^23.