The independent variables: the concentration of hydrochloric acid used and the surface area of the magnesium metal used the controlled variables (constants): the quantity of the magnesium for each test will be held constant for the magnesium ribbon, the lengths of the magnesium ribbon used will be constant, while quantities of powdered magnesium metal (in grams) will be equivalent to the weight of the length of magnesium ribbon used. Surface area surface area is the measure of how much exposed area a solid object has, expressed in square units mathematical description of the surface area is considerably more involved than the definition of arc length of a curve. Must be kept constant in order to ensure that the only factor affecting the reaction time is the surface area to volume ratio of the blocks6 cm once again will affect the composition of the agar blocks8 cm.
My hypothesis was that if the surface area to volume ratio of calcium carbonate was increased, then the rate of the reaction will increase because there are more particles that are accessible by the hydrochloric acid, thus more particles that can react with each other. Diffusion of hydrochloric acid into different sizes of agar blocks aim: investigating the relationship between the diffusion and the surface area to volume ratio, with agar and hydrochloric acid research question: how does the difference in surface area to volume ratio affect the diffusion. If there is a smaller surface area there is less collisions, therefore there is a decrease in the rate of reaction aim: my aim for carrying out this investigation is to find out whether concentration effects the rate of reaction between hydrochloric acid and magnesium metal. Thus, the total surface area volume over volume ratio would be 6:1 - an of agar block will have total surface then, the total surface area over volume ratio would be 3: 1 - an of agar block will have total surface.
• the volume of sodium thiosulphate the volume of sodium thiosulphate will remain unaffected throughout the whole experiment, where as i will be changing the concentrations of hydrochloric acid the volume of sodium thiosulphate will be 50cm³ the different concentrations of hydrochloric acid are 010m, 025m, 050m, 060m, 090m and 10m. When you increase surface area and volume of a cube, the volume increases more rapidly than the surface area this means that there is more volume for each unit of surface area therefore, it would take longer for substances to diffuse into the cell. -prepare several boiling tubes with the same concentration of hydrochloric acid and put tubes into water baths of varying temperatures -place equal-sized cubes of agar jelly into each boiling tube and time how long it takes for each cube to turn colourless.
Controlled variabletemperature of the surrounding surface area to volume ratio of the agar blocks volume of solution to place the agar blocks into temperature is set at an air-conditioned room in a biology lab the agar blocks are cut into same length, same breadth and same height (3 0 cm by 1 0 cm by 0 5cm), thus having the same volume and surface area. You would expect the cubes with the largest surface area to volume ratio to go colourless the fastest how would you measure the affect of concentration gradient has on diffusion using agar jelly -prepare test tubes containing different concentrations of hydrochloric acid. Concentration of hcl there will be more hcl acid molecules per set open document click the button above to view the complete essay, speech, term paper, or research paper.
Effect of surface area on the rate of reaction: when the particle size of a fixed mass of a solid reactant becomes smaller, the total exposed surface area becomes larger, the rate of reaction increases. There are many variables that i can change, which are the temperature and concentration of the hydrochloric acid, and the mass and the surface area of the magnesium strip this is all true because they all link to the collision theory of particles colliding with enough energy to make a reaction. Pieces are used so that the surface area does not change significantly the quantity and concentration of hydrochloric acid is such that it is almost all used up. Effect of surface area to volume ratio on rate of osmosis 1471 words | 6 pages [type text] [type text] [type text] _an experiment on the effect of surface area to volume ratio on the rate of osmosis of solanum tuberosum l_ background a cell needs to perform diffusion in order to survive. Another experiment one could do to determine the surface area to volume ratio is to construct a set of cubes out of construction paper- 1 x 1, 2 x 2, 3 x 3 and 4 x 4 (cm)then use this formula to determine the surface area- l x w x 6 and compare it with the volumes.
Investigating the surface area to volume ratio this practical activity is helpful in developing an understanding of the effect of particle size on surface area in this example, students use a block of plasticine to represent a large particle of reactant material. The aim of this experiment is to investigate how different concentrations of one type of reactant (hydrochloric acid) affect the rate of reaction between marble chips (caco3) and hydrochloric acid (hcl) by measuring the volume of carbon dioxide (co2) produced. The larger the surface area to volume ratio of the potato the quicker the rate of osmosis, thus, greater % change of mass variables independent- size of the potato cubes, ie, its surface area to volume ratio.
The surface area of material will affect the rate of reaction which is slow or fast the reaction the effect of surface area can be determined by recording the time taken for the reaction to occur the rate of reaction will increase when the surface area of the reactant increase. Surface area can affect the rate of reaction the more finely divided the solid is, the faster the reaction happens a powdered solid will normally produce a faster reaction than if the same mass is present as a single lump. The rate of the reaction between calcium carbonate and dilute hydrochloric acid can be judged by measuring the volume of carbon dioxide evolved with time in this simulation you will discover the effect on the rate of reaction of altering the surface area of a solid reactant, and explain this effect in terms of kinetic particle theory.