can someone help with chemistry stuff The air that we breathe can be separated i

Question

can someone help with chemistry stuff

The air that we breathe can be separated into simpler substances by physical means. Some, but not all, pure substances can be broken down into simpler substances by using chemical separation techniques. In which of the three physical states of matter are the cohesive forces between particles the strongest? There are six possible changes of state. These six possibilities are organized into three pairs, with one member of each pair being the "opposite" of the other. Fill in the blanks below to illustrate the six possible changes of state and their arrangement into three pairs. ENDOTHERMIC MEMBER of PAIR ONE EXOTHERMIC MEMBER of PAIR ONE ENDOTHERMIC MEMBER of PAIR TWO EXOTHERMIC MEMBER of PAIR TWO ENDOTHERMIC MEMBER of PAIR THREE EXOTHERMIC MEMBER of PAIR THREE What is the definition of an element? There are known elements of which are naturally occurring and of which are radioactive. A compound is a physical combination of two or more elements. The atom is the smallest unit of a compound that can exist and still retain all of the properties of that compound.

Explanation / Answer

39) Option a) True
The air that we breath is basically nitrogen (78%) and oxygen (21%).
For example, the nitrogen can be separated from the air by fractional distillation at very high pressures.

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