Characteristic properties are used because the sample size and the shape of the substance does not matter.
Answer:
C3H8 +5O2 arrow 3CO2 +4H2O
Two independent variables could change at the same time, and you would not know which variable affected the dependent variable
Answer:
neutrons
Explanation:
isotopes have the same number of protons nut different number of neutrons. the difference in thr mumber of neutrons give them their uniques properties.
