Types of reactions you will see in chemistry

Question 1

what are precipitations reactions ?

Answer 1

1. reactions that create solids
2. double replacement reactions

AB + CD ====== AC + BD

You can get a good idea if precipitation will happen by understanding Solubility rule of compounds (meaning the compound can break in water)

Question 2

What are Acid- Base (Neutraliation equations)

Answer 2

• Making a salt, these are the reaction that will allows to buffer acids because by making a salt and water ( products) the acid nor the base can’t give off their H+ or OH- to offset the the pH

Overview: understanding acids and base

1. Know your acid:
   
   1. Arhenius: gives H +
   2. Brosted: gives protrons +
   3. Lewis: electron acceptor -
   4. general formula: H and X in water
2. Know your base:
   
   1. Arrhenius: gives OH -
   2. Bronsted: accept protons +
   3. Lewis: electron donors -
   4. general formula: Metal + OH -
3. Know your salt: any chemical compounds made from acids reacting with base

Acid + Base ==== Salt + H20

Salt: M (metal) + X ( of the acid) + Water from the H and OH of the acid and base

Question 3

What are combination reactions

Answer 3

• two or more compounds coming together to form one ( synthesis)

PCl3 + Cl3 == PCl5 (properties of these reactants combined will make different reactants)

Question 4

Decomposition reactions

Answer 4

Spliting up a compound - usually requires the input of heat (endothermic)

What are the compounds that are usually involved?

1. Salt with carbonate ( CO3-) or metal with CO3- will break down into oxide (oxigen) and CO2
2. or salt with sulfate or metal with SO2 can break into salt with salfate = oxide and SO2

Question 5

What are Redox reactions?

Answer 5

1. A reaction where the electrons are moving within the an atom.
2. Reduction: gain of electron
3. oxidation: loss of electrons

• *How it Manifest**
• Single relpacement*
• A + BC ==== AB + C usually with one element and 2 compounds and one element is ready to give an electron.
• Happens at the same time as oxidation

Question 6

What is a combustion reactions?

Answer 6

1. A reaction that releases alot of heat
2. Usually requires a hydrocarbon CH + O2 == CO2 + H2O and Heat
3. This happens often in the Human body