the passage of materials into and out of the cell. Cell membranes are ‘semi-permeable’ which means that some substances can easily pass through them‚ whereas others cannot. Materials move by simple diffusion from high concentration on one side of the membrane to a lower concentration on the other side. Water is the most abundant and one of the most important substances in cells. The diffusion of water across a membrane is called osmosis. Water will diffuse
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Table Nr 1. Color changes in IKI test for presence of starch and for presence of sugar in Benedict’s test |Part 1 |Original content |Original color |Final color |Color after Benedict’s test | |Sausage casing |glucose and starch |clear |clear | | |Beaker |distiled water |transparent |transparent
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experiment we explore the infestation of ECB (European Corn Borer) on different types of corn and how it effects the corn crop yield. The corn is grown in a controlled environment with the only changing variables being the type of corn and the concentrations of the infestation of the ECB. Varying levels of infestation are tested on a corn crop throughout a 140 day growing season‚ at the end of the season the crops are then measured for yield. Yield is determined by the number of ears per stalk and
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you will investigate the effect of solute concentration on water potential as it relates to living plant tissues. OBJECTIVES Before you begin this lab you should understand: - the mechanisms of diffusion and osmosis and their importance to cells - the concept of water potential - the relationship between solute concentration‚ pressure potential and the water potential of a solution - the concept of molarity and its relationship to osmotic concentration **also read the section on water potential
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Repeat steps 1 – 6 to make 20 mL of a 2 M solution of magnesium sulfate (F.W. 246.48) in a small flask or beaker. PART B: MAKING PARALLEL DILUTIONS A dilution consists of adding addition solvent (usually water) to a solution to reduce its concentration. Dilution Terminology a) One part food coloring combined with 9 parts water means the food coloring is 1 part in 10 mL total volume or 1/10 food coloring. The denominator in an expression with a slash (/) is the total volume of the solution
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are to plan an experiment to investigate how the boiling point of an aqueous solution of potassium chloride depends on the concentration of the solution. (a) (i) By considering how the vapour pressure changes as the concentration of the aqueous potassium chloride increases‚ predict and explain how the boiling point of the solution will be affected by the concentration of the solution. Predict how the boiling point will change
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The definition of a solute is the reactant that’s being dissolved. The only difference from a solute and a solvent is that the solvent is the one that’s doing the dissolving. Molecules randomly flow in all directions until there is an equal concentration throughout the solution. The dissolving process can vary depending on certain factors. Temperature‚ pressure‚ and surface area all affect the dissolving process. Increasing the pressure causes the solute to be increased in the solvent
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manipulating the concentration and weight percent of the active metal. 36 5.2 Conclusion In this research‚ the objective are to determine the effect of concentration of KOH to yield of FAME and also to determine the effect of KOH weight percent as loading metal in OPKS support. From the result shown in previous chapter‚ we can see the trend of graph for each parameter which is yield of FAME increase if concentration of KOH/weight percent of KOH increase. The best KOH concentration that gives the
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the liquid. Combine the following rate expressions for diffusion through the gas and liquid films‚ -rA=kAga(pA-pAi) and -rA=kAlaCAi-CA‚ with Henry’s law pAi=HACAi and the reaction rate equation given above‚ to eliminate the pressure and concentration at the interface (pAi and CAi) and to prove that the final rate expression for the overall rate of the process is -rA=pA1kAga+HAkAla+HAkCB Solution -rA=kAga(pA-pAi) (1) -rA=kAlaCAi-CA‚ (2) pAi=HACAi (3) -rA=kCACB (4) From (1)
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of light reaching the solution is needed. Each solution with a different solute has its own characteristic absorption property or spectrum. Spectrophotometer can also be used to find out the concentration of compounds in solution because the amount of light absorbed is directly proportional to the concentration of absorbing compounds in that sample. When a solution like bromophenol blue absorbs certain wavelengths of light in the visible spectrum and transmits or reflects others‚ it appears coloured
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