Unit 1 Chemistry Quiz

What is the formula for finding the number of molecules, atoms, or formula units?

• Molar mass x Number of molecules

• Number of moles / Avogadro's number
• Number of moles x Avogadro's number
• Avogadro's number / Number of moles

What is the formula for finding the number of moles (INCLUDING MASS)?

• Volume / Molar mass

• Density x Molar mass

• Temperature x Molar mass

• Mass / Molar mass

What is the formula for finding the number of moles (NOT USING MASS) ?

• Concentration x Avogadro’s number

• Number of atoms/Avogadro’s number

• Number of molecules x Avogadro’s number

• Temperature/Molar Mass

What formula is used to find the number of representative particles?

• Number of moles x Avogadro’s number

• Concentration x Molar mass

• Mass/Volume

• Molar mass x Number of moles

What is the formula for finding mass?

• Molar mass x Avogadro’s number

• Number of moles × Molar mass

• Number of moles x Density

• Volume/Concentration

What is the formula for finding molar mass (GIVEN ATOMS)?

• Density x Volume

• ∑(Atomic mass of each element x Number of atoms of that element) 

• Atomic mass of each 

  element + Number of moles

• Number of atoms/Mass of substance

What is the formula for finding molar mass (GIVEN MASS OR MOLES)?

• Number of moles/Avogadro's Number

• Number of moles x Density

• Mass/Number of moles

• Mass/Concentration

What is the formula for percentage of a component in a mixture?

• (Total mass of mixture/Mass of component x 100)

• (Mass of component/Mass of component x Total Mass of Mixture)

• (Mass of Component/ Total Mass of Mixture) x 100

• (Mass of component + Total mass of mixture x 100)

How do you find average atomic mass?

• Σ (mass of isotope - relative abundance)

• Σ (relative abundance of isotope n) × (mass of isotope n)

• (mass of isotope / relative abundance) × 100

• mass of isotope + relative abundance

Define the structure of an atom.

• Atoms are made up of only protons and electrons.
• An atom consists only of electrons without a nucleus.
• An atom has a solid core with no empty space around it.
• An atom is structured with a nucleus containing protons and neutrons, surrounded by electrons in orbitals.