PLEEEZE help
name the type of reaction
K + MgBr ->
Not enough information is provided. And not magnesium bromide is MgBr2. Is this a solution phase or exactly how is the K metal added to the MgBr2?
As DrBob has indicated, not all of the information has been provided. You probably meant:
2K(s) + MgBr2(aq) --> 2KBr(aq) + Mg(s)
There is a bit of the problem with this particular reaction in that potassium with react rather violently with water before it gets much opportunity to react with the magnesium bromide. Also metallic magnesium will react with water (see below) although not as rapidly as potassium.
Nevertheless, back to the reaction type there are the five types. Here is review. Which one do you think it is and why?
Synthesis (Formation) Reactions
General equation: A + B ---> AB
Elements and compounds combine to form larger more complicated reaction. There are fewer compounds on the product (right) side of the equation.
Examples:
2P + 5O2 → P2O5
3O2 → 2O3
2CoF2 + F2 → 2CoF3
Decomposition Reactions
General equation: AB ---> A + B
Compounds fall apart and form two or more products
Examples
Ca(ClO3)2 → CaCl2 + 3O2
2Au2O3 → 4Au + 3O2
C3H5(NO3)3 → CO2 + N2 + H2O + O2
Single Replacement (One element exchanges for another)
General equation: A + BC -> AC + B
An element replaces another element in a compound. A metal can replace another metal in a compound, or a nonmetal can replace another nonmetal in a compound.
Examples:
Zn + 2HCl -> ZnCl2 + H2
Cu + 2AgNO3 -> Cu(NO3)2 + 2Ag
Double Replacement (Two compounds exchange ions)
General equation: AB + CD -> AD + CB
The positive ions in two compounds switch places, resulting in two new compounds.
Examples:
NaCl + AgNO3 -> NaNO3 + AgCl
KOH + HCl -> KCl + H2O
Combustion Reactions
General equation: Hydrocarbon + Oxygen -> Carbon Dioxide + Water
A hydrocarbon compound reacts with oxygen to produce carbon dioxide and water.
Examples:
C3H8 + 5O2 -> 3CO2 + 4H2O
2C4H10 + 13O2 -> 8CO2 + 10H2O
Based on the given reaction:
2K(s) + MgBr2(aq) -> 2KBr(aq) + Mg(s)
This is a double replacement reaction because the positive ions of the compounds, K and Mg, switch places to form two new compounds, KBr and Mg.