CHEMISTRY SAMPLE PAPER - I CLASS - XII Time : Three Hours Max. Marks : 70 General Instructions 1. All questions are compulsory. 2. Question nos. 1 to 8 are very short answer questions and carry 1 mark each. 3. Question nos. 9 to 18 are short answer questions and carry 2 marks each. 4. Question nos. 19 to 27 are also short answer questions and carry 3 marks each 5. Question nos. 28 to 30 are long answer questions and carry 5 marks each 6. Use log tables if necessary‚ use of calculators is
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membrane. How well did the results compared with your predictions? Glucose could diffuse through the 200 MWCO while albumin could not diffuse through such membrane. It was because there was difference of molecule weight between them. Glucose (C6H12O6) has a molecular weight of 180 g/mol and albumin‚ which is protein with 607 amino acids‚ each single amino acid is 135 g/mole‚ has a molecular weight of(607 x 135) 81945 g/mole. Since the molecular of albumin is quite larger in molecular weight compared
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TOPIC 5 ECOLOGY 5.1.1 The study of the interactions between organisms and their environment. ENVIRONMENT = all the factors that affect an organism. 5.1.1 ABIOTIC FACTORS = non-living factors in an environment BIOTIC FACTORS = living factors in an environment ABIOTIC BIOTIC water fish chemicals in water aquatic plant depth fungi temperature protists - algae light Relationship - Photosynthesis Wet lands = also called ‘estuary’ Ecosystem: - A stable‚ settled
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Fossil Fuel Consumption‚ CO2 and Its Impact on Global Climate Background: At the beginning of human history‚ we had to satisfy our energy needs (for food‚ heat and movement) by using our own muscle power and gathering or hunting naturally available plants‚ animals and wood. Each stage in the evolution of human society (the development of farming‚ domestication of animals‚ harnessing of wind and water power) increased the average per capita energy use‚ but it was the Industrial Revolution and the
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have the ability to do so. Background Information: When dissolved in water‚ NaHCO3 produces carbon dioxide gas: . As can be seen in the equation for photosynthesis‚ carbon dioxide is a reactant in photosynthesis: 6 CO2 + 12 H2O + photons → C6H12O6 + 6 O2 + 6 H2O. The presence of NaHCO3 means that CO2 is more readily available in larger quantities‚ to speed up the process of respiration. However if a large amount of CO2 is present in the water the Cobomba plant will not be able to use it all
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Ch.2 Essential chemistry for Biology 1. Water is precious to life because living organisms use water as the medium (solvent) for chemical reactions necessary to sustain life. Water also helps maintain temperatures. Droughts are disastrous because they can wipe out crops‚ which in turn cause famine. 2. MATTER: Composed of chemical elements‚ occupies space and has mass (ex: solid‚ liquid‚ and gas states.) CHEMICAL ELEMENTS: substance that cannot be broken down into other substances by chemical reactions
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transportation - Oxygen and carbon dioxide Respiration : - all processes that accomplish movement of O2 from the environment to the tissues - has 2 components : a) Cellular respiration ( in mitochondria): refers to intracellular metabolic processes C6H12O6 + O2 6CO2 + 6H2O b) External respiration : events involved in the exchange of O2 and CO2 between the external environment and cellular mitochondria Function of respiration 1. Provides oxygen 2. Eliminates carbon dioxide 3. Regulates the blood’s
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INTROduction TO THE HUMAN BODY 1. Define anatomy and physiology While anatomy provides us with a static image of the body architecture‚ physiology reveals the body’s dynamic and animated workings. Physiology often focuses on events at the cellular or molecular level. A. Anatomy – studies the structure of the body parts and their relationship to one another. i. Developmental – concerns structural changes that in the body occur throughout the lifespan. Embryology studies the developmental changes
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the total greenhouse effect. Its concentration is increasing in the atmosphere due in large part to the extensive burning of coal and other fossil fuels for energy production (EPA‚ 2014). The Chemical process of combustion can be showed by 6 O2 + C6H12O6 --------> 6 H2O + 6 CO2 + energy (Kreger C‚ November 2004). Methane or CH4 is present in the atmosphere at less than 1% the levels of carbon dioxide‚ however it is 25 times more efficient as a
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Cellular Respiration  Cellular respiration is the process of oxidizing food molecules‚ like glucose‚ to carbon dioxide and water. C6H12O6 + 6O2 + 6H2O → 12H2O + 6 CO2 The energy released is trapped in the form of ATP for use by all the energy-consuming activities of the cell. The process occurs in two phases: glycolysis‚ the breakdown of glucose to pyruvic acid the complete oxidation of pyruvic acid to carbon dioxide and water In eukaryotes‚ glycolysis occurs in the cytosol. (Link to
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