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• calculate the quantity of heat involved to convert 500. g of ice at -50.0°c to steam at 200°c. the heat of fusion is 333 j/g and the heat of vaporization is 2256 j/g. specific heat of ice = 2.06
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½H2(g) + ½I2(g) → HI(g), ΔH = +6.2 kcal/mole 21.0 kcal/mole + C(s) + 2S(s) → CS2(l) The temperature of the surroundings will: increase or decrease
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I really need help... 20 POINTS!! The taxonomic reference for lemurs is Eukarya, Animalia, Chordata, Mammalia, Primate, Lemuridae, Lemur, catta. Lemurs belong to which phylum? A. Chordata B. Animali
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Consider the following enthalpy diagram. mc024-1.jpg What is the overall enthalpy change DHrxn for the system? -1,300 kJ -300 kJ 300 kJ 1,300 kJ
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I'm not sure how to go about this question is it true?Explain whether the following statement is true:"When metals react with acids, the metals will always be oxidised and hydrogen will always be redu
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A student measure the mass and volume of a piece of aluminum. The measurements are 25.6 g and 9.1 cubic centimeters. Teh student calculated the density of the aluminum. What is the percent effor of th
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how is it that an electron behaves like a particle and at the same can act like a wave?he dual property of an electron was coined by a French physicist known as Louis de Broglie. He suggested that an
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For lunch, a patient consumed 3 oz of skinless chicken, 3 oz of broccoli, 1 medium apple, and 1 cup of nonfat milk (see Table). How many kilocalories did the patient obtain from the lunch?
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What volume of a 4.0 M stock solution of HNO3 is needed to prepare 4.5 L of a 2.5 M HNO3 solution? (1 point)
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Se considera compusii organici cu formula generala Cn H2n-2 Cl2 care contin 56,8% Cl. a) sa se determine F.M. a compusilor organici considerati; b) sa se calculeze NE; c) sa se scrie formulele structu
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State the relationship between the number of electrons in a carbon-nitrogen bond and carbon-nitrogen bond energy
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Several general characteristics of metabolic reactions or reaction pathways are listed below. sort them into the appropriate metabolic category. note: if you answer any part of this question incorrect
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The picture is a model of a nitrogen atom. What is incorrect about the atomic orbital arrangement of electrons in this model and how should they be arranged?
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For an experiment, a biology student makes 1 liter of a solution containing the following substances, which are shown in the table below. Using the given information, fill in the missing parts of the
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If the temperature of an object is 335 K, how would this be expressed on the Celsius scale? A. 608°C B. 273°C C. 37°C D. 62°C
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Which one of the following methods could you use to separate NaCl from water? Disintegration Distillation Dissolution Dehydration Flag Question
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When chromium loses two electrons, its configuration changes to A. [Ar]3d4. B. [Ar]4s1. C. [Ar]4s13d4. D. [Ar]4s13d5.
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Electronegativity tends to increase from left to right across a row, because A. the shielding effect increases. B. the number of energy levels increases. C. the attraction between the nucleus and the
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I need help with a chemistry question: Understanding how electrostatic forces cancel The picture of the question is attached.
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An element “X” has mass number 35 and the number of neutrons is 18. Identify the group number and period of “X”.
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How much carbon dioxide is produced from the complete aerobic catabolism of fructose-1,6-bisphosphate?
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The line between which two points would describe a process of liquid ammonia boiling completely away?
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Black and green tea have a growing body of research suggesting there are positive health benefits on because of the anti-oxidants. However, there is ongoing discussion about the impact of adding milk
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In the event of a chemical spill in the laboratory that involves broken glass, briefly explain the correct order of steps that should be taken by the student to address this situation. Be clear and de
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Suppose you were required to make a solution by diluting 20.0 mL of an aqueous solution to a final volume of 750 mL. Describe, in as much detail as possible, the entire dilution process from beginning
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How does sexual reproduction increase genetic diversity in many species? Be sure to include information on the importance and function of gametes
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the mass of a material is 49 grams and the volume of the material is 14 cm ^3 what would the density of the material be?
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Which grouping in the animal kingdom is the only one that contains organisms with vertebrae Pls help
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Bromine water and cyclohexene mechanism?could someone pls explain what is happening during this reaction? does the double bond break in the end?
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H =15 + 3.2t gives the height of a shrub in inches after t weeks. When the height is 31 inches 31 = 15 + 3.2t
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The mass of car 2 is twice the mass of car 1. If both cars have the same velocity, how does the kinetic energy of car 2 compare to car 1?
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What is this molecule called?there are 3 carbons so it would be prop but there is a double bond so it would be propan but what is the functional group?
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Friction _____. is always and unwanted force works in the opposite direction of motion causes machines to work 100 percent efficiently can be increased using lubricants, like oil
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Matt did an experiment to study the solubility of two substances. He poured 100 mL of water at 20 °C into each of two beakers labeled A and B. He put 50 g of Substance A in the beaker labeled A and 5
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The gas in the piston is being heated, and the piston has moved upward. The observation will be summarized in a row of the incomplete table below. Row : 1, 2, 3, 4 Name:Boyle's law, Charles’s law,
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Radical chlorination of ethylcyclopropane produces all possible monochlorinated products. how many constitutional isomers are formed?
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A specimen of copper having a rectangular cross section 15.2 mm × 19.1 mm (0.60 in. × 0.75 in.) is pulled in tension with 44,500 n (10,000 lbf) force, producing only elastic deformation. calculate t
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Write a hypothesis for part 1 of the lab,which is about the effect on an object being carried by a car,when the car experiences a sudden impact. ise the format of "if... then... because..." and be sur
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Write a paragraph explaining IN DETAIL how plants make their own food. Remember to write in complete sentences and explain your thoughts in detail.
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The ph of gastric juice in the stomach of a certain individual is 1.00. after a few aspirin tablets have been swallowed, the concentration of acetylsalicylic acid in the stomach is 0.400 m. calculate
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Projectile proton with a speed of 1000 m/s collides elastically with a target proton initially at rest. the two protons then move along perpendicular paths, with the projectile path at 38° from the o
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For trial 1 of an equilibrium reaction, 4 ml of 0.0007 mol/l fe(no3)3 is combined with 1 ml of 0.0004 mol/l kscn and 4 ml of 0.65 mol/l hno3. the solvent for the metal and ligand solutions is 0.65 mol
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Consider a lead-tin alloy that has the composition 20wt% pb – 80wt% sn. the temperature is 180°c. (i) what (mass) fraction of the alloy is in the phase, and what fraction is in the phase? (
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G [reftech] a refrigerator operates at steady state with a coefficient of performance of 4.5 and a power input of 0.8 kw. energy is rejected from the refrigerator to the surroundings at 20 oc by heat
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Chlorine gas reacts with fluorine gas to form chlorine trifluoride. cl2(g)+3f2(g)→2clf3(g) a 1.90 l reaction vessel, initially at 298 k, contains chlorine gas at a partial pressure of 337 mmhg and f
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A thin circular sheet of glass of diameter 7 meters is rubbed with a cloth on one surface, and becomes charged uniformly. a chloride ion (a chlorine atom which has gained one extra electron) passes ne
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A factory at a low elevation ships bags of popcorn to cities at high elevations. Why does the factory manager need to monitor the amount of air in each bag? Too few molecules can cause the bag to coll
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Worth 20 pt plz answerwhy are the oldest parts of the ocean floor no older than about 200 million years old
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The half-life of Zn-71 is 2.4 minutes. if one had 100.0 grams at the beginning, how many grams would be left after 7.2 minutes has elapsed?
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BasedonReferenceTableJ,whichtworeactants react spontaneously? (1) Mg(s) + ZnCl2(aq) (3) Pb(s) + ZnCl2(aq) (2) Cu(s) + FeSO4(aq) (4) Co(s) + NaCl(aq)
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