Chemical Reaction Types-Please Help!

[TNB]

O.K. I seem to have forgotten how to "do" the different types of chemical equations in chemistry and their characteristics.

The reactions we've studied in my chem class this year, along with a few questions, are as follows:

Combustion-What categorizes a reaction as this? What are the typical products?

Single replacement-What categorizes a reaction as this? What are the typical products? What are the typical reactants?

Double Replacement-What categorizes a reaction as this? What are the typical products? What are the typical reactants?

Redox (Reduction/Oxidation Reactions) - Uh, what are these?

:eek:Yes, it's a lot.:eek:

[Sodapop]

O.K. I seem to have forgotten how to "do" the different types of chemical equations in chemistry and their characteristics.

The reactions we've studied in my chem class this year, along with a few questions, are as follows:

Combustion-What categorizes a reaction as this? What are the typical products?

Single replacement-What categorizes a reaction as this? What are the typical products? What are the typical reactants?

Double Replacement-What categorizes a reaction as this? What are the typical products? What are the typical reactants?

Redox (Reduction/Oxidation Reactions) - Uh, what are these?

:eek:Yes, it's a lot.:eek:

a) A combustion reaction is a notable "burning" reaction. It is exothermic and it's the result of a reaction between an oxidant and a fuel. It produces heat, of course, but can also produce light (notably flames, sparks or flashes).
Example: 2H2 + O2 → 2H2O + heat

b) A single replacement reaction is a reaction where an element (usually a metal) replaces another one in the final solution.
(A + BC -> AC + B) where A switch places with B.
Example: Zn + 2HCl -> ZnCl2 + H2

c) Same thing, but with two elements this time.
Example: AgNO3 + KCl -> AgCl + KNO3

d) It's when a reaction creates a new oxidation state for atoms, which differ from their original one. My knowledge on redox is quite limited though, I hope someone else can help you on that point. :p
(http://en.wikipedia.org/wiki/Oxidant)

[TNB]

thankyouthankyou. :bow:

What happened to the extra smilies?

I repped you, by the way.

[Russ]

Point of clarification for combustion reactions, you'll usually be asked to write the reaction for a hydrocarbon, in which case CO2 will also be a product.

Redox chemistry (reduction / oxidation) is when you have two "half equations" that can be combined into a full equation.

One of the half equations will be oxidation, the other will be reduction.
Oxidation is when an oxidation number increases, reduction is when it decreases. An oxidant causes oxidation and is itself reduced. A reductant causes reduction and is itself oxidised.

Therefore, for the reactions:

Fe(2+) + 2e -> Fe [Reduction]
Zn -> Zn(2+) + 2e [Oxidation]

And the full equation would be

Fe(2+) + Zn -> Fe + Zn(2+)

Hope that helped.

Also, I wrote those equations of the top of my head, I don't know if they fit the electrochemical series.

[Sonic]

Combustion is a fuel and oxidising agent giving off heat and often light. Nearly always this is a hydrocarbon and oxygen in the air. There are two main types of combustion

Complete Combustion is when a fuel burns completely. In the case of hydrocarbons this means Carbon Dioxide and water are formed and the most heat is given off. On a Bunsen burner it will be a blue flame.

Incomplete Combustion is when a fuel does not burn completely. With hydrocarbons this means that carbon monoxide/carbon and water is formed. If there is very little oxygen in the air then carbon will be formed. If there is more than enough for carbon but not enough for carbon dioxide than carbon monoxide is formed.