D.
The volume of water in a graduated cylinder
should be read at the bottom of the curve of the meniscus.
Birds and bees. Adam and Eve
Examples are smoke, oceanic haze, air pollution, smog, etc.
Answer:
Organic compounds can be synthesized in a laboratory setting
Organic compounds contain carbon
There are hundreds of thousands of organic compounds,
Explanation:
Organic compounds are compounds that are found in life i.e plants and animals. The bulk of compounds that makes up living organisms are called organic compounds.
The idea that organic compounds can only be found in living organisms has been proven wrong by the synthesis of urea in the laboratory.
Organic chemistry studies compounds of carbons with the exception of oxides, carbides and carbonates.
All these other compounds of carbon apart from the above listed ones are called organic compounds.
Answer: The ratio of the number of oxygen molecules to the number of nitrogen molecules in these flasks is 1: 1
Explanation:
According to avogadro's law, equal volumes of all gases at same temperature and pressure have equal number of moles.
According to avogadro's law, 1 mole of every substance contains avogadro's number 
of particles.
Thus as oxygen and nitrogen are at same temperature and pressure and are in equal volume flasks , they have same number of moles and thus have same number of molecules.
The ratio of the number of oxygen molecules to the number of nitrogen molecules in these flasks is 1: 1
