CHEMISTRY. 1. Evaporation of a liquid can take place a)At its boiling point b) Below its boiling point c) At all temperatures d) At a fixed temperature 2.Evaporation of water will increase with a) addition of a solute to it b) decrease in temperature c) increase in temperature d)less surface area 3.Diffusion is faster in the case of a)Oxygen b) nitrogen c) hydrogen d) Carbon dioxide 4.During evaporation‚ particles of a liquid change to vapours only: a)from the
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[Problems 1‚ 3‚ 4‚ and 5 due: Wednesday‚ September 19th‚ 2012] Problem # 1: Solubility of formaldehyde in a solvent is measured by a spectrophotometer operating at 570 nm. The data collected are optical density versus concentration expressed in grams per liter. Concentration‚ c 100 300 500 600 700 Optical density‚ d 0.086 0.269 0.445 0.538 0.626 Based on Beer’s law‚ obtain the best estimates of the coefficients for a linear relation c = bo + b1 d and plot the equation obtained together with the data. NOTE:
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used to separate magnetic substances from waste water. Filtration is a technique that will separate a solid that has not yet dissolved in a liquid. Take a mixture of a solid and liquid and run it through a filter‚ the liquid will pass through the filter and you will be left with the sold. The filter has little holes in it that are small enough to only let liquid through. Filtration is not a technique to separate solids‚ separating solids like that is called sifting. Example of filtration includes your
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space‚ has a mass‚ exists in 3 physical states namely solids‚ liquids & gases; composed of particles. Solid: have fixed shape‚ fixed volume. Liquid: takes shape of part of container below liquid level. No fixed shape‚ has fixed volume‚ flow easily. Gas: when collected into vessels occupies all space inside vessel‚ takes shape of container‚ no fixed shape or volume. Arrangement of particles in solids‚ liquids & gases • Attractive force among particles strongest in solid
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Newton’s 2 Law to the falling oil drop yields: Kvf - mg = 0 (E-field off) (1) qnE - mg – kvr = 0 (E-field on) (2) In Equations (1) and (2) we have neglected the buoyant force exerted by the air on the droplet. This is reasonable since the density of air is only about one-thousandth that of oil. The equations can now be used to obtain an expression for the charge qn on the oil drop. The result is: qn = (mg(vf+vr))/vfE¬ (3) The electric field in the region of the oil drop is produced
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Pineapple (Ananas comosus) Skin Extract as Component in Making a Moisturizing Soap A Research Project III By: Alfajardo‚ Jessa N. Alforque‚ Bliss L. III-Science Class Submitted to: Ms. Dinna Carangue Research I Adviser CHAPTER 1 The Problem and its Scope Rationale: Cleanliness is necessary to everyone. It affects the people‚ the community and their environment. It is a contributing factor that leads to the goodness of one’s health for a better and safe environment for a healthy
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Calculate the energy change (q) of the surroundings (water) using the enthalpy equation qwater = m × c × ΔT. We can assume that the specific heat capacity of water is 4.18 J / (g × °C) and the density of water is 1.00 g/mL. The water has absorbed the heat of the metal. So‚ qwater = qmetal m=mass of water= density x volume = 1 x 26 = 26 grams ΔT = T(mix) – T(water) = 38.9 – 25.3 = 13.6 q(water) =26 x 13.6 x 4.18 q(water) = 1478 Joules 2. Using the formula qmetal = m × c × ΔT‚ calculate
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application of rigorous optimization techniques to identify the critical subset of potential discontinuities‚ and hence also the critical failure mechanism and margin of safety. The accuracy of the DLO solution is controlled by the specified nodal density. Within the set of all possible discontinuitiues linking pairs of nodes‚ all potential translational failure mechanisms are considered‚ whether anticipated or not by the engineer. Failure mechanisms involving rotations along the edges of solid bodies
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5.5 Candy Chromatography Background Information: Paper Chromatography is a separation tool in which pigment is put on a paper made of cellulose and water‚ and placed in a solvent‚ in this case isopropyl alcohol. Due to capillary action‚ the solvent crawls up the paper‚ separating the pigments. This technique is used to identify components of a mixture‚ even unknown ones‚ and can be used to isolate components into pure samples. Real world uses of this technique includes identifying certain biomolecules
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viscosity of a mixture of liquid Research Question The effect of hydrogen bonding on resisting flow of five different liquids Background Theory Viscosity is the resistance of a fluid to flow‚ either within itself‚ or to moving past an objects moving through it. A liquid with high viscosity is thick and flows slowly. A liquid with a low viscosity is thin and flows quickly. Different liquids have different viscosities. Factors‚ which affect viscosity of a liquid‚ are: Size of a molecule:
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