RESEARCH QUESTION What is the effect of exercise on heart rate/ breathing rate? Justification Pulse is an ongoing wave of pressure in the arteries‚ caused by pumping of heart. Pulse can be measured on the wrist‚ neck‚ back of the knee or any other pulse point where arteries run close to the surface of the skin and compress on the bone. Pulse rates vary from person to person. Your pulse is lower when you rest and increases when you exercise. More oxygen rich blood is needed by the body when exercising
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relationship between moles evolved and consumed. This can be demonstrated by measuring the hydrogen gas evolved by performing a chemical experiment when hydrochloric acid reacts with the magnesium. The formulated reaction includes; Mg + 2HCl → H2 + Mg2+(aq) + 2Cl- (aq) The major findings contributing to the experiment is being able to determine and distinguish what moles have evolved thus being the hydrogen moles evolved allowing the magnesium to be consumed within the reaction. Procedure
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Observations: Part I: Reaction between iron and oxygen Appearance of steel wool after 20 minutes From (relatively) shiny metal strips to not-so-shiny strips that are stained with dark‚ reddish-brown stuff. Part II: Decomposition of hydrogen peroxide Appearance of potato and hydrogen peroxide combination: Lots of white‚ foamy bubbles around the potato slices. Day 2 Observations: Part III: Reaction between zinc and acetic acid Appearance of penny in vinegar after
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Enzymes are catalytic proteins that selectively speed up chemical reactions without by consumed by the reaction itself (1). Enzyme activity is significantly affected by factors such as temperature‚ substrate concentration‚ enzyme concentration and pH. Enzymes are highly specific and only catalyse one specific chemical reaction‚ speeding up the reaction by lowering the activation energy‚ the energy required to start a chemical reaction (2). At high temperatures and with various mechanical forces or
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IntroductionThe purpose of this experiment is to determine whether or not caffeine has an affect on the heart rate of DaphniaHypothesisThe Daphnia heart rate will increase with the concentration of caffeine. I based my hypothesis on the fact that humans heart rates increase with caffeine as it acts as a stimulant drug. In the experiment there will be several variables that I need to try and control‚ the temperature of the water is one of these because if the temperature is higher or lower on the
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Batavia‚ Il: Flinn Scientific. Calculations (Weight of Mg ribbon used for conversion) (____¬.50 g¬¬¬¬____) = .038 g/cm2 (Width of ribbon)(length of conversion Mg ribbon) (.3 cm x 44.15 cm) (Conversion factor)(Length of Mg ribbon)(width of Mg ribbon) = mass of Mg ribbon .038 g/cm2 (.9 cm x .3cm) = .0103 g Volume of H2 gas 11.5 mL Amount to be subtracted or removed to correct the meniscus - .2 mL Corrected
Free Pressure Ideal gas law Mole
Abstract This experiment is to study the effect of temperature on the rate of reaction between potassium permanganate with oxalic acid. We used 2cm3 of 0.02M potassium permanganate and 4cm3 of 1M sulphuric acid into a test tube. In another test tube‚ we placed 2cm3 of oxalic acid. We placed the test tubes in a water bath at 40‚ 45‚ 50‚ 55 and 60oC respectively. When the solutions have attained these temperatures pour the oxalic acid into the acidified permanganate solution and recorded the time
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January 23rd‚ 2013 Generation of Hydrogen Gas Abstract Hydrogen gas was produced from a reaction in a eudiometer between a weighted amount of magnesium ribbon and 5ml of diluted 6M hydrochloric acid. The partial pressure of the hydrogen gas produced was calculated using Dalton’s Law of partial pressure. With this partial pressure value along with known values in the experiment the number of moles of hydrogen gas produced could be calculated using the ideal gas law equation and this experimental
Free Pressure Ideal gas law Chlorine
and turnover intentions. Design/methodology/approach – Building on attribution theory‚ the study tests the assumption that negative work-related health attributions impair employee work-related attitudes and intentions‚ and moderate the relation between health status and work-related attitudes. Cross-sectional questionnaire data from 785 Swedish retail white-collar workers are collected to test these assumptions by utilizing moderated regression analyses. Findings – The results show that negative
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deflator) is a way for measuring the changes in the average of prices of all goods and services that constitute GDP (gross domestic product). As shown in the graph above‚ in year 2007‚ the inflation rate of Singapore higher than United Kingdom. It is because the Singapore’s electronic road pricing (ERP) rates are already raised for not only 2nd times but 3rd times in the year. In Addition‚ it also due to wages of employees increased‚ this causes the increasing of quantity of demand and cause higher price
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