Quantitative Chemistry

Cards (8)

When metals corrode, the overall mass of the reaction will appear to increase. This is because oxygen atoms from the atmosphere have been added to the metal
Burning of wood
When wood is burnt, it releases carbon dioxide and water (and often other gases).
These gases can escape into the atmosphere. These gases can't be weighed easily at the end of a reaction.
to reduce uncertainty, repeat the experiment and calculate a mean
Avogadro's constant
moles = 6.02x10^23
The reactant that is completely used up is called the limiting reactant because the reaction stops when it is used up.
$concentration=$ $moles/volume$
When neutralising an acid, it is important that there's no acid left after the reaction. To make sure this happens, we use an excess (‘more than necessary’) amount of the other reactant.
The relative formula mass of a substance is equal to the mass of 1 mole of that substance.