Answer:
Solar power take less energy compare to other and its charge by sun According to me solar energy is best way to save energy in future
Static Friction, Sliding Friction, Rolling Friction, and finally Fluid Friction.
Answer:
NO3 that is the answer to the question
0.000001ppm
Explanation:
Mass of fluoride = 500g
Volume of water = 500000liters
Unknown:
Parts per million of fluoride = ?
Solution:
The parts per million is the amount of solute in milligram dissolved in a liter of water or milligram per kilogram of solvent
It is a unit used to express very small concentration.
we need to convert g - mg
500g = 500 x 10⁻³mg = 0.5mg
Concentration in parts per million = 
Concentration in parts per million =
= 0.000001ppm
learn more:
Parts per million brainly.com/question/2854033
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I think the correct answer is option A. Pure substances can be considered as compounds. Compounds are molecules made of atoms from different elements held together by chemical bonds. Pure substances are these compounds that exist alone no other substance.