substance can be defined as: Amount of a substance that contains as many particles (atoms‚ molecules or ions) as there are atoms in 12 g of the 12C isotope Avogadro number or Avogadro constant (NA); equal to 6.022 × 1023 particles Example − 1 mole of oxygen atoms = 6.022 × 1023 atoms 1 mole of carbon dioxide molecules = 6.022 × 1023 molecules 1 mole of sodium chloride = 6.022 × 1023 formula units of sodium chloride Molar mass of a substance can be defined as: Mass of one mole of a substance in grams
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Effect Of Exercise On The Body Aim The aim of the experiment is to find out the effect exercise has on the body‚ and why these changes take place in the body. Introduction Respiration is the physical process by which living organisms take in oxygen from the surrounding medium and emit carbon dioxide. The term respiration is also used to refer to the liberation of energy‚ within the cell‚ from fuel molecules such as carbohydrates and fats. Carbon dioxide and water are the products of this process
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exercise and the resting rates will be restored soon after exercise has stopped. I believe that the changes are caused by the increased need for oxygen and energy in muscles as they have to contract faster during exercise. When the exercise is finished the heart and ventilation rates will gradually decrease back to the resting rates as the muscles’ need for oxygen and energy will be smaller than during exercise. Experiment: 1. To start with the experiment we measured the persons resting heart rate
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Determining the Effect of Varying Substrate Concentration Question: How does concentration of potatoes affect the amount of oxygen produced with hydrogen peroxide and potatoes (enzymes)? Introduction The enzyme used for this experiment is Catalase. Catalase is inside mostly any living organism which uses oxygen. Its job is to break down hydrogen peroxide‚ into oxygen and water. (Formula) 2H2O2 ---> 2H2O + O2 (lab manual). There are limiting factors which if altered‚ can alter the procedure
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What is the percentage of sodium (by mass) in sodium phosphate? (42.1%) 3. For the hydrate sodium sulfate decahydrate‚ calculate the following: (a) the percent of sodium (by mass) in the hydrate (14.3%) (b) percent of TOTAL oxygen (by mass) in the hydrated compound. (69.6%) (c) Percent of water (by mass) in the hydrate (55.9%) 4. Calculate the percentage of nitrogen (by mass) in the ammonium nitride (82.4%) Moles Worksheet 1. How many moles are there
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amount of salinity in the water affect gross primary productivity? Hypothesis: The higher the salinity content in the water the lower the gross primary productivity values. Variables: Control- The group with zero salt added. Dependent- Dissolved oxygen reading. Independent- The salt concentration in the water. Introduction: On the surface waters of lakes and oceans‚ plants are mainly unicellular algae‚ and most consumers are microscopic crustaceans and protozoans. Both the producers and consumers
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NAME : SUZANNE YEOH CLASS : 4SC4 (2012) TEACHER : PN. ROZITA DATE : 8.10.2012 INDEX No. | Title | Page | 1 | 9.1 Human Activities that Endanger an Ecosystem - introduction - pollution - strategies to solve problems related to pollution | 3 - 11 | 2 | 9.2 The Greenhouse Effect and the Thinning of the Ozone Layer - The greenhouse effect - The thinning of the ozone layer - Impact of global warming and the
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chemistry using Priestley’s discovery of oxygen. Priestley founded the method of collecting gases by bubbling through water and collecting in an inverted gas jar by water displacement.
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high oxygen MAP is identified as a potential technology that addresses key shortcomings in traditional modified atmosphere packaging. What are Minimally Processed Fruits and Vegetables? Minimally processed fruit and vegetables can be classified as those fruit and vegetables which have been trimmed‚ peeled or cut into ready to use (RTU) products‚ can be pre-packaged‚ and offer consumers nutrition‚ convenience and
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atmospheric carbon dioxide‚ water and sunlight and converted it into sugar (glucose) and released the waste product oxygen. Photosynthesis reduced the amount of carbon dioxide in the atmosphere‚ as oxygen was continually being released. For roughly a billion years‚ oxygen released by cyanobacteria did not build up in the atmosphere. It was used up by two sources: oceans and rocks. Oxygen dissolved in the oceans and oxidized (rusted) the exposed iron and other minerals‚ as seen in banded rock formations
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