chapter 11.1 describing chemical reactions

diatomic molecules alone have

2 on bottom

diatomic molecules inckude

(H)ave (N)o (F)ear (O)f (I)ce (C)old (B)eer


1. hydrogen
2. nitrogen
3. fluorine
4. oxygen
5. iodine
6. chlorine
7. bromine

chemical equation

representation of a chemical reaction; formulas of reactants connected by arrow with products

skeleton equation

chemical equation doesn’t indicate relative amounts of reactants and products

catalyst

substance that speeds up reaction but isn’t used up in reaction

synthesis reactions- number of answers

1

synthesis reactions

two or more combine to form one new compound

* A+X=AX
* a and x can be compound or element, AX is compound

decomposistion reactions

one reactant, two products

single compound undergoes reactions that produces 2 or more simpler substances AX=A+X

single-displacment reactions

one element replaces similar element in compound (ie. metal replaces metal)

* element+compound=element+compound

single displacment example

al+pb(no3) >> pb +al(no3)

displacement of halogens

* fluorine is most common
* ex. cl2+kbr>>kcl+br

double-displacement reactions

ions from 2 compounds exchange places in eqautions solution to form 2 new compounds

* compound+compound=compound+compound

combustion of a gas

substance combines with oxygen

forumla- CxHy+O2 > CO2+H2O