A bug walking on the surface of a puddle is depending on HIGH SURFACE TENSION BECAUSE OF THE ATTRACTION BETWEEN WATER MOLECULES.
Water has a lot of interesting properties due to the hydrogen bonds that hold its molecules together. One of the interesting property of water is surface tension.
Surface tension refers to the property of the water surface, which enables it to resist an external force. The cohesive forces among the water molecules is responsible for the surface tension. The surface tension of water allow small animals such as insects to walk on water.
Question 1
Fe(III) forms a chelate complex with salicylic acid which has purple color. therefore, when a solution is made either with salicylic acid or with aspirin having trae amount of salicylic acid in it, we see color formation in solution due to the resulting complex formed.
Question 2
The Fe(III) itself absorbs some light and gives an absorbance value for the solution. Therefore, it is necessary to blank the spectrophotometer with a Fe(III) solution prior to measurement of test solutions.
Answer:
37.14 %
Explanation:
Using the equation, mass, M = D1 * V1
= D2 * V2
Where,
D1 = density of the liquid Nitrogen
D2 = density of gaseous Nitrogen
V1 = volume of the liquid Nitrogen
V2 = volume of the gaseous Nitrogen
Calculating V2,
0.808 * 185 = 1.15 * V2
Volume of Nitrogen after expansion = 129.98 m3.
Volume = L * b * h
= 10 * 10 * 3.5
Volume of the room = 350 m3.
Fraction of air = volume of Nitrogen after expansion/volume of the room * 100
= 129.98/350 *100
= 37.14 %
