Answer:
a measure of the suitability of water for a particular use based on selected physical, chemical, and biological characteristics.
Yes it is always changing, as time moves on new technological advancements are made. This makes it possible for new ideas to be created. For example the depiction of an atom went through many stages throughout the years in order to find out our current final version. New scientists and new ideas can add on to older ones, making explanations that make more scientific sense.
C
Explanation :
Alkene decolorizes water so it has a C=C
74 is the answer u find it by subtracting the protons(atomic number) from atomic mas, so basically... 127-53 =74 neutrons
146°C, 351K, 133°F, 95°F, 25°C, 58°F, 273K
