Compare the action of Josiah (2Kings 23:6; 2Kings 23:12). Water is poured into it and the microscope is focussed again on the scratch at the bottom of the beaker. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. The corresponding readings are 1.17, 2.02 and 4.57 cm respectively, the refractive index of water is 2.02 and 4.57 cm respectively, the refractive index of water is (i) Calculate... Primary and High School Exams in Kenya With Marking Schemes. Because of the very small size of its particles, lycopodium powder can be used to demonstrate Brownian motion. The figure below represents a bimetallic strip of metals X and Y at room temperature. In special effects pyrotechnics, lycopodium powder and non-dairy creamer are two common means of producing safe, controlled fire effects. The powder around the hot needle moves away. The powder floats evenly separated on the surface of the water. As the detergent gradually mixes with the water, the powder begins to sink, and a needle will now pass through the surface with ease under its own weight. When a drop of the solution of oleic acid in the solution spreads on water surface as it does not dissolve in water. (b) Lycopodium powder spreads on the entire surface of water. A red hot needle is plunged into the centre of the water surface. HOW DOES IT WORK? By gently blowing on the surface all the loose powder was removed and there was left on the surface … Gently shake off the powder then show the audience your ‘dry hand’. 12. This makes it perfect for keeping dry and fresh. Lycopodium powder is a fine yellow powder derived from the spores of Lycopodium clavatum (stag's horn club moss, running ground pine). If we assume that there are no energy losses,calculate the new temperature of the water as... a) The data below was obtained in an experiment to estimate the diameter of an oil molecule:-. An oil drop is carefully placed at the centre of the tray and allowed to spread on the surface of water until it is one molecule thick. This is because water has a high surface tension, meaning the water molecules have a strong attraction to each other and they like to stick together. (b) Mixing of oleic acid in water is prevented by Lycopodium when a drop of oleic acid is poured on water. Now, lycopodium powder is sprinkled evenly over the film and its diameter is measured. 14. Some lycopodium powder is sprinkled on the surface of water and microscope is focussed on to the powder. Read the passage carefully and answer the following questions: a) Why do we dissolve oleic acid in alcohol? Their ability to repel moisture also prevents their adhesion to each other. The powder is also highly hydrophobic; if the surface of a cup of water is coated with lycopodium powder, a finger or other object inserted straight into the cup will come out dusted with the powder but remain perfectly dry. The solution spreads over the surface of water forming one molecule thick layer. Figure shows a beam balance made out of concrete and reinforced with steel. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. This ensures that the pills are resistant to water absorption. Instead it spreads on the water surface pushing the lycopodium powder away to clear a circular area where the drop falls. State and explain what is observed. (b)Lycopodium powder spreads on the entire surface of water when it is sprinkled evenly. 3 Important Uses of Lycopodium Spore Powder Lycopodium powder is generally made from the spores of club moss. PURE SCIENCE. State two liquids which are used in thermometer. It is composed of the dry spores of clubmoss plants, various fern relatives principally in the genera Lycopodium and Diphasiastrum.
Labradoodle Separation Anxiety, Burn Notice Season 5, Gintama 2 Goku, Fake Snaps To Give To Creeps, De Havilland Fox Moth Interior, Walmart Associate News 2021,