dioxide gas” i. CuS + O2 Cu + SO2(g) b. When heated‚ baking soda (sodium hydrogen carbonate) decomposes to form the products sodium carbonate‚ carbon dioxide‚ and water.” i. NaHCO3 Na2CO3 + CO2 + H2O 11. Write and balance equations for the following reactions. a. “Iron metal and chlorine gas react to form solid iron(III) chloride” i. 2FeCl3(s) b. “Solid aluminum carbonate decomposes to form solid aluminum oxide and carbon dioxide gas” i. Al2O3(s) + CO2(g) c. “Solid
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CHEM 1411 – General Chemistry I Practice Problems‚ Chapters 1–3 Chapter 1 – Chemistry: The Study of Change 1. Element‚ compound‚ homogeneous mixture (solution)‚ or heterogeneous mixture: a) orange juice b) brass c) 0.9% saline (NaCl) solution d) garden soil e) room air f) methane gas g) sodium metal h) N2 gas i) Cu(NO3)2 crystals (freshly-squeezed) 2. Define (some of these terms are found in Chapters 2 and 3): a) c) e) g) i) k) m) o) 3. b) d) f) h) j) l) n) compound physical change
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laboratory work: 10/9/2012 5:00-7:45 Date of report written: 10/15/2012 Introduction: The purpose is to isolate caffeine from coffee by using the organic solvent dichloromethane (CH2Cl2) that is also referred to as direct contact. Calcium carbonate (CaCO3) is used to remove the tannins from the coffee. Afterwards an extraction is used to separate the organic layer (bottom) from the aqueous layer (upper). By using a rotary evaporator‚ it evaporates the organic solvent and forms the crude
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IGCSE Complete Chemistry Notes Unit 1: States of matter Everything is made of particles. Particles in solid are not free to move around. Liquids and gases can. As particles move they collide with each other and bounce off in all directions. This is called random motion. In 2 substances‚ when mixed‚ particles bounce off in all directions when they collide. This mixing process is called diffusion. It’s also the movement of particles without a force. The smallest particle
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RESOURCES Why farmers sometimes need to change the pH of soil A healthy‚ productive farm is created from the ground up. The fertility‚ structure and biological activity of your soil are the keys to raising successful crops. Great soil grows great plants with increased vigour and pest tolerance‚ not to mention maximized yields. There’s a lot to know about your soil for sure‚ but the most critical measurement is its pH. What is pH? Represented on a scale of 0 to 14‚ pH is the measurement of the
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iscussion The results and calculations shows that 1 tablet of Quick-eze is most effective in neutralizing the stomach because the number of moles of HCl reacted with the NaOH is 0.00216 moles‚ which is less than Gaviscon. The number of moles of NaOH that were added from the burette is 0.00327 moles (1 tablet of Gaviscon). However‚ for Quick-eze‚ the number of moles is 0.00216 moles (1 tablet). This means the average volume of the NaOH have affected the number of moles as the concentration of the
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Determination of Calcium Carbonate in Eggshells – Background The major component of eggshells is calcium carbonate‚ CaCO3(s). This analysis is done volumetrically by using a characteristic reaction of carbonate compounds‚ namely their reaction with acids. Calcium carbonate (limestone) is very insoluble in pure water but readily reacts in acid according to the reaction below. 2HCl(aq) + CaCO3(s) → CaCl2(aq) + CO2(g) + H2O(l) + HCl(aq) (in excess) (limiting reagent) (1) (unreacted)
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chemical reaction by their symbols or formulas. Reversible reaction- a chemical reaction in which the products re-form the original Synthesis reaction- a composition‚ reaction‚ 2 or more substances combine to form a new compound Electrolysis- the decomposition of a substance by an electric current Double displacement reactions- the ions of 2 compounds exchange places in an aqueous solution to form 2 compounds Combustion reaction- a substance combines with oxygen‚ releasing a large amount of energy
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gas that burns with a pop sound when a flaming wooden splint is placed near it.liqiud y is most likely a compound that has the formula a.c2h5oh b.hcooh c.h3cooch3 d.c6h14 3.a compound p has the following characteristics: -reacts with sodium carbonate to release a gas that clouds lime water -reacts with compound q to form a fragrant liquid a.p-sulphuric acid q-ethyl ethanoate b.p-ethanoic acid q-ethyl ethanoate c. p-ethanoic acid q-ethanol d. p-ethanol q- ethanoic acid 4.element-proton
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oil – for skin inflammation to left leg (for a week) Past History: Smokes ½ a pack of cigarettes per day (since she was a teenager) Weight: 70 kg Height: 150 cm DOCTOR’S ORDER: Medications: Ancef 750 mg IV q12h Elavil 50 mg po qhs Calcium Carbonate 1000 mg po once daily Vit D 1000 units po once daily Actonel 35 mg/week po Vagifem 10mcg tablet into the vagina qhs Imitrex 75 mg po q4h prn for a maximum of 2 doses daily Metformin 750 mg po TID with meals Buffered Aspirin 650 mg po q6h
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