Chemistry Quiz

What is Avogadro's number?

• 6.022 × 10²³

• 3.14 × 10²³

• 1.602 × 10⁻¹⁹

• 9.81 × 10²

What is the formula to calculate the number of moles?

• n = mass(g) / Molar mass (g/mol)

• n = Molar mass (g/mol) / mass(g)

• n = mass(g) × Molar mass (g/mol)

• n = mass(g) + Molar mass (g/mol)

Why are moles needed in chemistry?

• They represent the number of particles.

• They measure temperature.

• They indicate color changes.

• They determine pH levels.

Tags

NGSS.HS-PS1-7

What can the mass spectrum of a sample be used to determine?

• Identity of isotopes and their relative abundance.

• Color of the element.

• Temperature of the sample.

• Volume of the sample.

What is the primary purpose of mass spectrometry?

• To determine the color of a sample

• To measure the temperature of a sample

• To determine the molecular mass of atoms/molecules in a sample

• To calculate the volume of a sample

How does mass spectrometry separate ions?

• By their color

• By their mass to charge ratio (m/z)

• By their temperature

• By their volume

Tags

NGSS.HS-PS3-5

What are the two isotopes of natural copper mentioned in the text?

• 62Cu and 64Cu

• 63Cu and 65Cu

• 60Cu and 66Cu

• 61Cu and 67Cu

What percentage of natural copper atoms does the 63Cu isotope make up?

• 50%

• 69%

• 31%

• 80%

What is the empirical formula?

• The formula that lists the lowest whole number ratio of atoms in a compound.

• The formula that lists the highest whole number ratio of atoms in a compound.

• The formula that lists the exact number of atoms in a molecule.

• The formula that lists the average number of atoms in a compound.

What does Coulomb's law calculate?

• The force between two charged particles.

• The speed of light in a vacuum.

• The energy of a photon.

• The mass of an electron.

Tags

NGSS.HS-PS2-4