Moles : The Concept
The SI unit for the amount of matter in a substance
How many molecules are in 2 moles of water?
What is 1.204 × 10²⁴ molecules?
True or False: The name of Na₂O is disodium monoxide.
False
This type of change does not alter the identity of a substance — examples include melting and boiling.
What is a physical change?
This term describes the number of atoms, ions, or molecules in one mole of a substance.
What is a representative particle?
What is the mass of 1 mole of CO₂?
What is 44 grams?
This compound is named hydrosulfuric acid. What is its formula?
What is H₂S?
The number of protons in an atom determines this.
What is the atomic number (or the identity of the element)?
This unit describes the mass of one mole of a substance.
What is molar mass?
You have 36 grams of water (H₂O). How many moles do you have?
What is 2 moles?
Name this polyatomic ion NH4+
Ammonium
This part of the periodic table tells you how many valence electrons an element in a main group has.
What is the group number (or column)?
This number represents the number of atoms in half of a mole
3.0x1023
How many atoms are in 3 moles of helium?
What is 1.807 × 10²⁴ atoms?
What is the name of Fe₂O₃,
What is iron(III) oxide
Describe the main difference between ionic and covalent bonds.
ionic bonds involve transfer of electrons; covalent bonds involve sharing electrons
This person's number is used to convert between particles and moles
What is Avogadro's number?
A sample contains 3.01 × 10²³ molecules of nitrogen gas (N₂). What is the mass of nitrogen atoms in the sample?
What is 14 grams?
(NH4)2SO4
Ammonium Sulfate
Two atoms have the same number of protons but different numbers of neutrons. What are they called?
What are isotopes?