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If you know the amount of the unbalanced force acting upon an object and the mass of the object, using Newton's 2nd Law what could you calculate about the object? A) acceleration B) friction C) inerti
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The unit cell for xenon fluoride is given below. what is the formula? if the unit cell has a height of 702pm and a length of 432pm, what is the density (in g/cm3)?
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In a hair sample drug test for cocaine that uses a G.C./M.S. , what is the stationary phase? I think the mobile phase would be Helium but l'm not sure about the stationary phase. If a research paper s
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A 30.0 L container was filled by pumping into it 10.0 L of CO2 gas at 60.0 torr of pressure and 20.0 L of O2 gas at 50.0 torr of pressure. All volumes and pressures were measured at the same temperatu
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A sample of CO2 gas with 10.0 L of volume and 60.0 torr of pressure is mixed with a sample of O2 gas with 20.0 L of volume and 50.0 torr of pressure, in a large container with 30.0 L of volume. What i
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By the end of this lab, you will determine whether you should add cocoa mix (a solid) before or after heating water (liquid) to make hot chocolate. State a broad question about solubility whose answer
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What is ΔG°rxn for the following reaction? 2NO(g) + Cl2(g) → 2NOCl(g) Substance ΔG°f (kJ/mol) NOCl(g) 66.35 NO(g) 86.55
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Compared to a potassium atom, a potassium ion has A) a smaller radius B) a larger radius C) fewer protons D) more protons
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When the equation Ca(OH)2 + HBr (products) is completed and balanced, one term in the equation will be
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Assignment: Boiling and Melting Points Exploration Analysis and Conclusions 1. Looking at the line plots on your graph, describe how boiling point and melting point vary with respect to atomic number.
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A sample contains 6.25 percent parent isotope and 93.75 percent daughter isotopes. If the half-life of the parent isotope is 58 years, how old is the sample?
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What would happen to temperatures on the Earth if the Sun's heat were not distributed throughout the atmosphere?
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What did rutherfords alpha scattering experiment suggested?c. all atoms are positively charged particlesd. the size of the atom is equal to the size of the nucleus
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Chemical weathering occurs faster in warm, tropical climates, although it happens in cold climates as well. Describe some conditions in Antarctica that could lead to chemical weathering.
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Find the pressure in mm Hg produced by 2.35g of carbon dioxide in a 5.00L flask at 18 degrees Celsius.
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When you chew your food to break down the larger pieces into smaller particles, how are you helping to increase the rate of the chemical reactions in your body that breaks down your food?
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In this experiment, you will first change the temperature of the water and determine its effect on the time it takes the tablet to dissolve. Then you will alter the size of the antacid tablet and dete
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For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? You do not need to look up any values to answer this question. Check all that apply. Check all that apply. H2O2(g)
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What is the photon energy of light with a wavelength of 941 nm Note that h = 6.626 × 10−34 J·s and c = 3.00 × 108 m/s.
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You are as a term of the identity of an unknown liquid and can measure only one physical property you heat the liquid and record that the liquid turns into vapor at 100 degrees C this demonstrates whi
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Which of the substances below will have the greatest standard molar entropy? c4h10(g) c4h10(l) xe(g)?
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We have learned that the lewis model portrays a chemical bond as the transfer or sharing of electrons represented as dots. valence bond theory portrays a chemical bond as the overlap of two half-fille
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Which is a better emulsifying agent (which is better at helping water and oil mix), the soap or the detergent?explain
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Qual a temperatura de um tanque com 253 g de nitrogenio com presão de 18mmhg e com um volume de 13,9m ao cubo . sabendo que sua maassa mecular é 28g
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What must be the current in a 4.97-mh inductor, such that the energy stored in the inductor equals the energy stored in the capacitor?
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The magnetic field in a charging capacitor when a capacitor is charged, the electric field e, and hence the electric flux φ, between the plates changes. this change in flux induces a magnetic field,
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The half equivalence point in the titration of 0.100 m hco2h (ka = 1.8 × 10-4) with 0.250 m naoh occurs at ph = ________.
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The crate c has a weight of 150 lb and rests on the truck elevator for which the coefficient of static friction is μs = 0.46
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The acceleration of a particle traveling along a straight line is a=15s1/2m/s2, where s is in meters. part a if v = 0, s = 3 m when t = 0, determine the particle's velocity at s = 6 m.
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Mass of 0.2776 g of ore was dissolved in i−(aq). the resulting solution required 17.98 ml of 0.01043 m na2s2o3 for complete titration. what is the percentage of copper in the
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What is the concentration of a solution made up of 25 g of sodium chloride in 125g of solution? A. 0.2%B. 5%C. 20%D. 150%
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Draw the structural formula for a hydrogen molecule (H2) and an oxygen molecule (O2). Remember that each line represents an electron pair being shared
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PLEASEE HELPP! Which of the following changes would show a decrease in energy? A.gas to plasma B.solid to gas C.liquid to gas D.liquid to solid Which of the following is true about a change from a sol
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During the period from about 1800 to about 1865, the atomic weights of many elements were accurately measured. Why was this important to Mendeleev's formulation of the periodic table?
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How many atoms of hydrogen are involved in the formation of two molecules of water as depicted by this chemical equation 2h2 + O2 = 2h2O?
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Chemistry
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A) calculate the ph of a buffer that is 0.190 m in nahco3 and 0.190 m in na2co3. (see the dissociation constants for acids table.) (b) calculate the ph of a solution formed by mixing 26. ml of 0.30 m
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Concept question (10 points) 1. predict the product. provide the stable organic product(s) for the reactions below.
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Bromination of an alkene by n-bromosuccinimide (nbs) in the presence of light or peroxide is a radical reaction and produces an allylic bromide. for the bromination of 3-methylcyclopentene, select the
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Use the standard free energy given in the above reaction to calculate equilibrium constant kp at 25c for the reaction
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The preexponential and activation energy for the diffusion of chromium in nickel are 1.1 × 10-4 m2/s and 272,000 j/mol, respectively. at what temperature (in ˚c) will the diffusion coefficient have
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You can practice converting between the mass of a solution and mass of solute when the mass percent concentration of a solution is known. the concentration of the kcn solution given in part a correspo
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When ethylbenzene is treated with nbs and irradiated with uv light, two stereoisomeric compounds are obtained in equal amounts. draw the products and explain why they are obtained in equal amounts:?
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Both Josef Loschmidt and Amedeo Avogadro contributed to our understanding of basic molecular numbers, sizes, and reaction ratios. Neither scientist discovered “Avogadro’s number” in the form we
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In the balanced reaction between sodium borohydride and hydrochloric acid, bh4- + h+ + y h2o → x h3bo3 + z h2 (g) what is the value of the coefficient of water, y?
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Which of the following would you predict to have a positive value for º? AgCl(s) → Ag+(aq) + Cl-(aq) H2O(g) → H2O(l) 2 Na(s) + Cl2(g) → 2NaCl(s) Br2(l) → Br2(s)
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Research face-centered cubic structures on the web. what is the length of one side of the crystal unit cell for aluminum? (show your work)
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If you have two samples that have the same mass but are composed of different elements, what can you conclude?
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If 2 grams of element x combine with 4 grams of element y to form compound xy , how many grams of element x would combine with 28 grams of element y to form the same compound
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Question 13 (Essay Worth 10 points) (03.02 HC) Use the portion of the periodic table shown below to answer the questions. A portion of the first three columns of the periodic table is shown. Column
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If two solutions with concentrations of 0.5 M sugar and 0.9 M sugar respectively are separated by a semipermeable membrane, during osmosis there is a net flow of: 1. Sugar molecules from the concentra
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