Sample D –TEACHER INSTRUCTIONS I.B. CHEMISTRY : PRACTICAL ELECTROCHEMISTRY INVESTIGATION : INVESTIGATE THE RATE OF ELECTROPLATING A METAL D DCP CE Goggles and Lab coats must be worn Background Students had been taught ‘Electrochemistry’ as outlined in the IB Chemistry syllabus. Investigation Design an experiment that allows you to investigate a variable affecting the rate of electroplating. Your research question must be focussed and specific and must enable you to carry out your experiment safely
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Effect of Concentration on Reaction Rate Aim: To use a simple reaction between sodium thiosulphate and hydrochloric acid to discover concentration this determines how fast chemical reactions occur. Independent Variable: Concentration of hydrochloric acid (%) Dependent Variable: Time taken for chemical reaction to take place (sec) Hypothesis: My prediction is that the increased concentration of the thiosulfate will in turn lead to an increase in the rate of reaction. This is a well informed
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Despite the sharp decrease in the dropout rate in rural America between the years 1975 and 1993 which essentially closed the gap between the urban and rural dropout rates‚ over 10 percent of rural students still do not finish high school and have difficulty finding gainful employment (e.g.‚ Paasch & Swaim‚ 1995). Graduation is an extremely important milestone in the life of an individual as they prepare for adult life (Paasch & Swaim‚ 1995). For instance‚ high school graduates have a greater chance
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Introduction: Basal Metabolic Rate has been defined as the minimum amount of energy needed by an animal to maintain the basic functions of survival (such as breathing). Several factors including age‚ gender‚ weight‚ and exercise affect the BMR. "BMR increases with increasing muscle tissue" therefore‚ exercising will enhance BMR while with increasing age‚ BMR is reduced (Scott‚ 2008). Also gender differences exist between males and females; it has been shown that males have higher BMRs
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Indicators – Vital Rates Vital Rate Definition/Explanation Calculated by… Example Birth Rate Dividing the total number of births in a year by the population and multiplying by 1000. Total number of births in the US (2008) = 4‚247‚694 Total population US = 307‚006‚550 Birth Rate = ___________ (per 1000) Death Rate Dividing the total number of deaths in a year by the population and multiplying by 1000. Death rate UK (2008) = _______________ per 1000 people Death rate in Botswana (2008)
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What happened to the R-R interval and heart rate after exercise? After exercise the R-R interval increased steadily from 0.48 to 0.68 seconds‚ while the heart rate BPM decreased steadily from 123 to 76; both trending back towards the resting values. What happened to the T-P interval during exercise? Outline what this means for ventricular filling time. During exercise there was a significant drop in the T-P interval which then steadily increased when exercise was completed. The T-P interval represents
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candle burned faster but they both burned at the same speed rate so it doesn’t really matter too much. Other brands could change the effect of the burn rate than other brands that are out there and they may also be made differently. There are more than one wax and that might change the burn rate of the candles. Some waxes may last longer than others. One thing that can be change the candle scents and see if that has any effect on the burning rate of the candle. There were no flaws in this experiment but
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The US has recently reached the lowest unemployment rate： 4.5%. In this article‚ the author provided different aspects of US’s low unemployment rate and the result of such a low unemployment rate. Comparing to the unemployment rate (10%) after 2008’s recession‚ US is now reaching a relatively low unemployment rate. A low unemployment rate is one of the four macroeconomic objectives that economists always want their nations to achieve. Unemployment is simply defined as the state of being out of
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Bridgeton Assignment 1. The overhead allocation rate used in the 1987 model year strategy study at the Automotive Component & Fabrication Plant (ACF) was 435% of direct labor dollar cost. Calculate the overhead allocation rate using the 1987 model year budget. Why do you get different numbers? 2. Calculate the overhead allocation rate for each of the model years 1988 through 1990. Are the changes since 1987 in overhead allocation rates significant? Why have these changes occurred? 3
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single corporate hurdle rate to evaluate its investment decisions in its products and systems segment as well as its telecommunications segment. Using only one hurdle rate doesn’t take into account the risk that the company faces within each segment. Investors demand higher returns for riskier investments. Victor Yossarian is concerned about the low returns for the high risk in the products and systems segment‚ this is why he wants to abandon this segment. Using two hurdle rates adjusts for the risk
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