types of reactions

Question 1

synthesis

Answer 1

occurs when 2 or more substances form together to form a more complex substance

exN2 + 2O2 gives 2NO2

Question 2

decomposition

Answer 2

occurs when a complex substance breaks down to form 2 or more simpler substances

ex 2HCl gives H2+Cl2

Question 3

electrolysis

Answer 3

type of decomposition
uses electricity as a reactant

ex 2NaCl + electricity gives 2Na + Cl2

Question 4

water forming decomposition

Answer 4

forms water as a product of decomposition

ex CuSO4•5H2O gives CuSO4 + 5H2O

Question 5

thermal decomposition

Answer 5

uses heat as a reactant in decomposition

ex 2KClO3 + heat gives 3O2 + 2KCl

Question 6

single replacement

Answer 6

one free element replaces another element in a compound

ex 2Fe + 3CuSO4 gives 3Cu + Fe2(SO4)

Question 7

double replacement

Answer 7

occurs when elements from two different compounds switch places

ex Pb(NO3)2 + 2NaI gives PbI2 + 2NaNO3

Question 8

neutralization

Answer 8

acid and base form a salt and water

type of double replacement

Question 9

hydrolysis

Answer 9

uses water as a reactant

type of double replacement

Question 10

combustion (burning in air)

Answer 10

must have O2 as a reactant

Question 11

hydrocarbon burning

Answer 11

compounds made of carbon and hydrogen burn to make carbon dioxide and water vapour (always)

ex C3H8 + 5O2 gives 3CO2 + 4H2O

Question 12

burning metals

Answer 12

makes metal oxides

ex 2Mg + O2 gives 2MgO