The unknown solid is removed by rinsing with water while the PDB is removed by rinsing with alcohol.
<h3>What are solvents?</h3>
Solvents are substances which dissolve other substances to form solutions or mixtures.
Water is used as a solvent for inorganic substances while organic solvents such as alcohol or kerosene are used as solvents for organic substances such as PDB.
Alcohol is added to the test tube containing PDB, which then dissolves. The tube is rinsed with more alcohol until all the PDB dissolves.
Therefore, the unknown solid is removed by rinsing with water while the PDB is removed by rinsing with alcohol.
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Answer:
C6H12O6 + 6O2 - 6CO2 + 6H2O + ENERGY
Explanation:
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Answer:A.Preventing convection currents that take heat aloft, in the same way that the glass of a greenhouse stops convection currents and so makes the air in the greenhouse warmer.
Explanation: when ultraviolet solar radiation penetrates into the Earth's atomosphere and heats it,
the conventional radiation is supposed to be radiated back into the atmosphere as heat.however this is prevented from happening due to green house gases,they absorb the radiant heat and retain this heat within the Earth's environment and so behaves like the glass barrier in green houses.these green house gases trap heat within the Earth causing global warming .
Answer: 196.36990920000002
