Answer:
if you check there penetrating power it is not equal so you have to consider that when talking about there electrophilic rxn in of furan.
Explanation:
they both travel at the speed of light 3.0 *10^8m/s, and their varying wavelengths
B. the physical properties have changed, but the chemical properties have not.
Percentage
by mass is the amount in mass of a component in a mixture per 100 unit of mass of the total
mixture. Percentage by mass is the same as %w/w. In order to determine this value, we need to know the mass of the substance in question and the total mass of the sample. In this case, we have to know the mass of Fe by doing certain calculations. Then, we divide this value by the total mass given of the ore, 4.05 g and multiply by 100%. It should be expressed as follows:
Percent by mass = mass of Fe in ore / 4.05 g ore sample x 100
However, the question is lacking some information so we cannot really specify the answer.
The answer would be B: Walking instead of driving a car to get to the library.
Explanation: Walking instead of driving conserves gas and puts less fumes into the environment.