chemistry

Question 1

cellular respiration

chemical equation

Answer 1

C6H12O6 + 6O2 -> 6CO2 + 6H2O

Question 2

physical property

Answer 2

not associated with a change in its vhemical composition (eg density, colour, hardness, melting)

Question 3

physical change

Answer 3

change in state/properties of without an accompanying change in the chemical composition eg ice/water

Question 4

chemical property

Answer 4

the change of one type of matter into another eg coking an egg, iron rusting
- resulting substances have different properties b/c atoms and molecules are arranged differently

Question 5

what are isomers

Answer 5

isomers are compounds with the same chemical formula but different molecular structure.

Question 6

calcuate 1 amu equation

Answer 6

1/atomic mass x atomic mass/avo constant

Question 7

eq to calcuate number of moles

Answer 7

mass/molar mass

Question 8

rules for asigning oxidation numbers

Answer 8

1. oxidation number of an atom in an elemental substance is zero
2. the oxidation # of a monatomic iion is equal to the ion’s charge
3. oxidation #’s for common non metals are assigned the following rules
   HYDROGEN: +1 combined w nonmetals
   -1 combined with metals
   OXYGEN: -2 in most compouds

Question 9

stoichiometry steps

Answer 9

BALANCE EQUATION: eg C3H6 + O2 -> CO2 + H2O == 2C3H6 + 9O2 -> 6CO2 + 6H2O
CALCULATE # of moles: # molecules/ avo’s constant eg (for o2, mass of co2 3.011 x 10^23) 9/6 x 5 = 7.5 moles
multiply # of moles x MM
convert to kg