the mole & balanced equations

• The gram formula mass of a substance (also called the relative formula mass) is the sum of the relative atomic masses of all the atoms present in the formula.
• Chemists use a quantity called the mole to carry out chemical calculations. One mole of a substance is equal to the gram formula mass of the substance in grams.
• One mole of carbon dioxide will have a mass of 44 g because the gram formula mass of carbon dioxide is 44 g.
• A mixture is two or more substances that are mixed together but not chemically joined.
• A solution is a special type of mixture that is made when a solid dissolves in a liquid.
• Solute + Solvent → Solution
• The solute is the substance that is dissolved
• The solvent is the substance that is doing the dissolving
• A concentrated solution has a high proportion of solute to solvent
• A dilute solution has a high proportion of solvent to solute
• A substance is said to be soluble if it can dissolve in a solvent.
• A substance is said to be insoluble if it does not dissolve in a solvent.
• Dissolving is not a chemical reaction but a physical change.