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Specific rotation of glucose at 20 degrees Celsius?

i performed this experiment and it comes out around 60 (radians*100cm3/gm*dm) where length of polarimeter tube was 2 dm and concentration was varied from 40 gm/100cm3 to 20gm/100cm3


If you used syrup and air comparison to magma flow in rock what would syrup and air represent?

In this comparison, syrup would represent magma, while air would represent gas bubbles within the magma. Just as syrup is viscous and can trap pockets of air, magma can contain trapped gas bubbles as it flows through rocks.


If 100cm3 of clean dry air is passed backwards and forwards across hot copper powder why does the volume of air decrease to 79cm3 when cooled to room temperature?

The decrease in volume of air is due to the copper powder absorbing oxygen from the air during the process, forming copper oxide. This chemical reaction reduces the amount of gas present in the container when it is cooled back to room temperature.


Beaker X contains 50cm3 of marbles while Beaker Y contains 100cm3 of water. When all the water in Beaker Y is poured into Beaker X what is the volume of the water in Beaker X?

The volume of the water in Beaker X will be 100cm3, as you are not adding any more water to the equation (50X+100Y is not 150Y or X, but 50X+100Y) The total volume of matter in Beaker X will be 150cm3, and if the beaker is labelled, the volume measure will indicate 150cm3 due to the displacement of water. But as the answer to your question, the volume of water in Beaker X must be 100cm3 even though visual indicators will not show this due to the displacement of water by marbles


How much gas is there in 100cm3 of air?

About 78% of air is nitrogen, which has a molar mass of approximately 28 g/mol. Given that air has a density of approximately 1.2 kg/m^3 at room temperature and pressure, you can calculate the amount of nitrogen gas present in 100 cm^3 of air.