w w ap eP m e tr .X w UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS for the guidance of teachers 0625 PHYSICS 0625/32 Paper 3 (Extended Theory)‚ maximum raw mark 80 This mark scheme is published as an aid to teachers and candidates‚ to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began
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Introduction We are going to do an experiment to see how surface area effects the rate of reaction when added to hydrochloric acid. I will add calcium carbonate (marble chips) to hydrochloric acid. When calcium carbonate is added to hydrochloric acid a reaction takes place. The solution fizzes and gives off the gas carbon dioxide. I will collect this gas in a gas syringe and will time how long it takes for the reaction to produce 100cm3 of carbon dioxide. CaCO3 +2HCL Co2 +CaCl2 +H2O CalciumHydrochloricCarbonCalciumWater
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Exploration Research Question What is the effect of different concentrations of sucrose in a solution on the mass and surface area of a beetroot (Beta Vulgaris) piece? Background The membrane consists of a phospholipid bilayer which is semi permeable. Osmosis is the passive movement of water molecules from an area of high water potential to an area of low water potential across a semi-permeable membrane. It is easy for water molecules to pass through this membrane however solutes that are big in
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your responses. All questions are 5 points (1 point for sentence number /correct units). Consider eight‚ eight-cubic centimeter (8 cm3) sugar cubes stacked so that they form a single 2 x 2 x 2 cube. How does the surface area of the single‚ large cube compare to the total surface area of the individual eight cubes? Report your answer as a ratio. Be sure to show all calculations leading to an answer. A rectangular barge 7 m long and 2 m wide floats in fresh water. How much will the barge sink
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Two types of grinding machines In materials processing a grinder is a machine for producing fine particle size reduction through attrition and compressive forces at the grain size level. See also crusher for mechanisms producing larger particles. In general‚ grinding processes require a relatively large amount of energy; for this reason‚ an experimental method to measure the energy used locally during milling with different machines was recently proposed. Ball mill A typical type of fine grinder
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Visit us at : http://www. agyatgupta.com; Email:agyat99@gmail.com Visit us at : http://www. agyatgupta.com; Email:agyat99@gmail.com the AP is (a) 3 (b) -3 (c) 4 (d) -9 Ans d Q.3 Distance of point (1‚2)‚ from the mid point of the line segment joining the points (6‚8) and (2‚4) is (a)4 units (b) 3 units (c) 2 units (d) 5 units Ans d Q.4 :GENERAL INSTRUCTIONS :1. All questions are compulsory. 2. The question paper consists of 34 questions divided into four sections A‚B‚C and D. Section – A comprises
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Grade 9 Math Test Perimeter and Area Part A: Multiple Choice - Circle the letter of the correct answer. (12marks) 1. A circle has an area of 27 cm2. About how long is the radius? A) 24 cm B) 14 cm C) 9 cm D) 3 cm 2. The area of the circle is about A) 201.1 cm2 B) 64.0 cm2 C) 50.3 cm2 D) 25.1 cm2 3. The area of the shape is about A) 9 cm2
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gram. If the mass of the beetroot cylinder varies it may cause a difference in diffusion capabilities. Length of beetroot cylinder The in order to ensure the surface area is kept the same‚ each cylinder must be 2 cm long. This should be measured using a 15cm ruler. If the lengths are different it would result in a difference of surface areas therefore questioning the test’s accuracy. Age of the beetroot To keep the age of the beetroot the same‚ the same beetroot will be used to extract the cylinders
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WWW.JAGRANJOSH.COM SSC COMBINED GRADUATE LEVEL (MAIN) EXAMINATION 2012 QUESTION PAPER SSC Combined Graduate Level (Main) Examination 2012 Question Paper 1. (a) ������ ������.������������������������������������ ������.������������������������������������ =? 9 44 27 44 (b) (c) 44 9 (d) 27 42 2. Complete the series 7‚ 26‚ 63‚ 124‚ 215‚ 342‚? (a) 481 (b) 511 (c) 391 (d) 421 3. A woman sells to the first customer half her stock of apples and half an apple‚ to
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Does Soap Affect the Surface Tension of Water? Background: Surface tension refers to water’s ability to "stick to itself". Surface tensioncan be measured and observed by dropping water (drop by drop) onto a penny. Thenumber of water drops that can fit on a penny will surprise you. Question: How does soap affect the water’s surface tension? Hypothesis: I think that the surface tension of soapy water will be less than that of freshwater because H 2 0 has strong polar bonds‚ and when water is mixed
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