The Earth’s atmosphere has changed over billions of years‚ but for the past 200 million years it has been much as it is today. We are‚ however‚ causing our atmosphere to change by human activity. Burning fossil fuels and deforestation are two examples of human effect on the environment. Composition of the Earth’s atmosphere The composition of air You need to know the proportions of the main gases in the atmosphere. The Earth’s atmosphere has remained much the same for the past 200 million years
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(II) Sulfate 12 NH4Cl Ammonium Chloride 13 ZnCO3 Zinc Carbonate 14 SnF2 Tin (II)Fluoride 15 MgSO4 Magnesium Sulfate 16 MnO2 Manganese (IV) Oxide 17 Ca3(PO4)2 Tricalcium Phosphate 18 NaOH Sodium Hydroxide 19 HCl Hydrogen Cloride 20 Ba(HSO3)2 Barium Bisulfite 21 HNO3 Hydrogen Nitrate 22 FeSO3 Iron (II) Sulfite 23 Al2S3 Aluminum Sulfide 24 KNO3 Potassium Nitrate Part B Write the formulas for the following compounds: 1 potassium cyanide KCN
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smallest structure in this list that can be seen with an ordinary desk microscope? 1. 2. 3. 4. Cells. Cell nucleus. Atoms. Chain molecules‚ such as proteins. Atoms In our model of scale‚ remember that the BB represented an atom. Electrons Hydrogen Helium Neutrons Protons As a class‚ identify the atoms represented here and label the sub-atomic particles. Carbon OxygenPhosphorous Calcium What elements are represented here? Use the Periodic Table on the wall to identify these atoms. What
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WEEK 2 Written Assignment I’m thinking no more than 1-2 paragraphs each for 3 & 4. 1. List the qualities (at least 6) that define life AND discuss how a single-celled organism‚ such as an Amoeba or a yeast cell‚ and a more complex one‚ such as a tree or a cat‚ matches up with each characteristic 1. Living things have cells. 2. Living things grow 3. Living things reproduce 4. Living things respond to stimuli 5. Living things use energy 6. Living things adapt to their environment A single celled
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example of where the reaction might be biologically important. Answer: Hydrolysis: Hydrolysis uses water (and various enzymes) to break down molecules into smaller‚ simpler molecules. This occurs by breaking a bond on the reactant and adding a hydrogen atom to one part‚ and a hydroxyl (-OH) to the other. The result is 2 simpler molecules. Macromolecule + Water molecule + molecule This process aids us in controlling blood sugar‚ by the hydrolysis of glycogen to glucose. Glycogen +
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compare that relative reactivity of Na and k -Sodium and potassium react somewhat similar when reacting with water however they are slightly different. Sodium moves because of the hydrogen coming off of it and has a low melting point while potassium’s reaction is faster and enough heat is produced to set light to the hydrogen coming off of it. Each leaves a pink color hue in the water. Discuss the similarities and differences in the behavior of the metals tested with water relative to their positions
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CBSE TEST PAPER-03 CLASS - X (Chemical Reactions and equations) 1. Take about 5 ml of dil. HCl in a test tube and add a few pieces of fine granules to it. Which gas is evolved? (a) Chlorine (b) Hydrogen (c) HCl (d) Nitrogen 2. Dissolving suger is an example of(a) Physical change (b) Chemical change (c) Redox Reaction (d) None of these. 3. Heat is evolved diving (a) Endothermic Reaction (b) Displacement Reaction (c) Combustion Reaction (d) Combination Reaction 4. Which of the following is not a balanced
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February‚ 2011 Due Date: 9th February‚ 2011 Title: Analysis of the Elements present in Organic Compounds Aims: To test the presence of Carbon‚ Hydrogen‚ Oxygen‚ Nitrogen and Sulfur in Organic Compounds Introduction: Organic Compounds can be considered as any compound containing carbon atoms covalently bonded with other atoms‚ usually hydrogen. Other atoms may include oxygen‚ nitrogen‚ sulfur…etc. They can be found in nature‚ since “organic” means present in‚ or derived from‚ plants and animals
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Chemistry * a science that dealing with the structure‚ composition and properties of items and with the transformations that they undergo * the composition and chemical properties of a substance * chemical processes and phenomena (as of an organism) Examples: - Digestion; enzymes promoting chemical reactions that power our bodies. Lifting your arm requires your body to make and burn ATP using oxygen with carbon dioxide as one of the waste gases produced. - The internal combustion
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Conservation of Mass Lab Author: Aubrey Bryant Team Members: Elianna Chavez‚ Berkley BresemannDate of Experiment: Date Report Submitted: September 30‚ 2014 Instructor: Josh GeisingerClass: Chemistry Purpose: The purpose of this experiment was to use the Law of Conservation of Mass and the Law of Definite Proportions to determine the quantity of zinc chloride that is produced in a chemical change from a given amount of zinc. Background: We used two important laws of chemistry in this lab
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