L6 OCR A Amounts of Substance

definition of empirical formula

• it shows the number and type of each atom in a molecule

• the simplest whole number ratio of the elements present in one molecule of the compound

• the atoms of the molecule in the order they are bonded

• it represents the molecule by showing all of the atoms, and all of the bonds between those atoms.

the definition of an isotope

• a positively or negatively charged atom or group of atoms

• The smallest particle of a substance that has all of the physical and chemical properties of that substance

• atoms of the same element with different numbers of neutrons and. different masses

• two or more substances are combined, but they are not combined chemically

definition of a mole

• a small burrowing mammal with dark velvety fur, a long muzzle, and very small eyes, feeding mainly on worms, grubs, and other invertebrates

• the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12

• a substance that cannot be broken down into another substance

what equation relates mass, moles, and Mr

• mass = moles x mr

• Mr = moles / mass

• mass = moles / Mr

• moles = mass / Mr

what is the equation that relates volume, 24, and moles

• moles = 24 / volume

• moles = volume / 24

• moles = volume / 25

• volume = moles /24

What is the chemical formula of the nitrate ion?