a) Water rises to a height of 20 mm in a capillary. If the radius of the capillary is made one third of its previous value then what is the new value of the capillary rise? b) The density of a pure liquid is 1.5 g/mL. If 4.3 mL of a liquid contains 60 drops, then calculate the number of molecules per drop of liquid (Molar mass of liquis: 80.4 g/mol, NA=6.02x1023).
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
a) Water rises to a height of 20 mm in a capillary. If the radius of the capillary is made one third of its
previous value then what is the new value of the capillary rise?
b) The density of a pure liquid is 1.5 g/mL. If 4.3 mL of a liquid contains 60 drops, then calculate the
number of molecules per drop of liquid (Molar mass of liquis: 80.4 g/mol, NA=6.02x1023).
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