2 elements for reactants and 1 compound for the product

Releases energy

Metal hydroxides

(bases)

What happens to H₂CO₃ upon formation?

One single reactant (compound) and two or more products

Requires energy

What do compounds containing carbonate

(CO₃^2-) decompose into?

Reactants = Element + Compound 

Products = A new compound and a single element

Use the activity series of metals

If the element (a metal) is higher on the chart than the element in the compound, the reaction will happen

(element=nonmetal, use periodic table and see if element is higher up in the group)

• Two ionic compounds for reactants
• Two new ionic compounds for products
• Formation of precipitate in reaction
• Water could be one of the products
• Same rules for replacement apply

In what order should you replace and criss cross in a double replacement reaction?

(Example: H₂SO₄ + Al(OH)₃)

Use a piece of paper and check your results after completion, if you want

First combine the H and OH. H is the farthest right and goes in front of OH

Do not pay attention to their current subscripts, only their charges

H⁺ OH^- ----> HOH, which = H₂O

Then combine the Al and SO₄

The first element of the second compound always goes in front of the second element/polyatomic ion of the first compound

Al^3- SO₄^2- ----> Al₂(SO₄)₃

One reactant = hydrocarbon (compound carbon and hydrogen)

Always combined with oxygen

Products are always CO₂ and H₂O