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Which greenhouse gas is produced by commercial refrigeration and air conditioning systems? carbon dioxide fluorinated gas nitrous oxide methane
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A vessel originally contains 4.8 mL of water. A toy dinosaur is placed inside, raising the water level to 5.6 mL
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When the human body perceives internal and external stimuli, it responds to maintain a stable internal environment. What is an example of an internal stimulus within the human body? A) light B) odor
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Convert the following to scientific notation: 45,700. A. 4.57 × 103 B. 4.57 × 104 C. 4.57 × 10-3 D. 4.57 × 10-4
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If i have 50 grains of sand in a ml of water, and i dilute it 1:100, how many grains of sand do i have per ml of the new solution?
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Compound a, c9h12, undergoes nitration to give 2 products. the 1h nmr spectrum of a shows a complex five-proton multiplet at 7.27-7.37 δ, a one-proton septet at 2.87 δ, and a six-proton doublet at 1
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Calculate the concentration of io3– in a 2.97 mm pb(no3)2 solution saturated with pb(io3)2. the ksp of pb(io3)2 is 2.5 × 10-13. assume that pb(io3)2 is a negligible source of pb2 compared to pb(no3
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Any crime punishable by imprisonment of one year or more is a/an A. misdemeanor. B. minor offense. C. criminal sentence. D. felony.
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How many moles of carbon dioxide would be produced if 0.28 moles of propane, C3H8, were combusted? C3H8+5O2–>3CO2+4H2O
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Under certain condition , rocky solid suddenly become as a liquid and flow (true or false, if its false tell why)
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A certain skin lotion is a fine mixture of water and various oils. this lotion is cloudy and cannot be separated into oil and water by filtration. moreover it's comments do not separate when left stan
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10 Points for the answers The following graph shows how density, temperature, and salinity of seawater are interrelated. The following table contains data for five samples of water. These samples were
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What weight of “A” can be removed from a solution that contains 6.00 grams of “A” in 50.0 mLs of water by a single extraction using 50.0 mLs of ligroin?
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In the early twentieth century, what was Alexander Fleming’s hypothesis concerning the relationship between a yellow-green mold and certain strains of bacteria?He thought the bacteria had released a
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What is the rate of the reaction when the initial concentration of no is 0.400 m and that of br2 is 0.255 m ? express your answer to three significant figures and include the appropriate units?
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The instruction booklet for your pressure cooker indicates that its highest setting is 13.3 psi . you know that standard atmospheric pressure is 14.7 psi, so the booklet must mean 13.3 psi above atmos
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Europium crystallizes in a body-centered cubic system with atoms at all lattice points and an edge length of 4.58 angstroms. calculate its density in g/cm3. .4236
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Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 7.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mole. 1.8361*10**24 (b) electro
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At a certain altitude it was found that water boils at 90 °c. what is the atmospheric pressure at this altitude?
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Calculate the total number of molecules of Magnesium Hypchlorite in a sample of 23.5 grams?A. 4.29e23 moleculesB. 4.815e23 moleculesC. 1.11e23 moleculesD. 3.634e23 moleculesE. 2.589e23 molecules
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Name of that attitude where each of the following occurs polar easterlies Western Easter lies and Tradewinds
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Calculate the amount of heat required to raise the temperature of an 67 g sample of water from 36 ∘C to 68 ∘C.
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What is true of rain which falls on deserts? It evaporates quickly because of the dry air. Most deserts receive over 30 inches. It runs off the ground. It soaks deep into parched ground.
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1.What is the freezing point in Celsius of a 0.00910 molal aqueous solution of sodium phosphate? What is the freezing point in Celsius of a 0.00910 molal aqueous solution of sodium phosphate? What i
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When adenosine triphosphate (ATP) releases the energy it carries, it typically breaks apart into _____. A.adenosine diphosphate (ADP) and adenosine monophosphate (AMP). B.adenosine diphosphate (ADP) a
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a box with a volume of 22.4 L contains 1.0 mol of nitrogen and 2.0 mol of hydrogen at 0°C, which of the following statements is true? a. the totally pressure in the box is 101 kPa b. the partial pres
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Which of the following is not a name of a valid chemical formula? hydrobromic acid ammonium nitrate aluminum (III) chloride copper (II) oxide
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Write a balanced chemical equation for the reaction that occurs when calcium metal undergoes a combination reaction with o2(g). express your answer as a balanced chemical equation. identify all of the
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What would you expect to observe if you added a saturated nacl solution to a pink [cocl4]2- / [co(h2o)6]2+ equilibrium mixture?
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Solutions of sulfuric acid and lead(ii) acetate react to form solid lead(ii) sulfate and a solution of acetic acid. if 6.00 g of sulfuric acid and 6.00 g of lead(ii) acetate are mixed, calculate the n
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How many liters of gas would be formed at 475 âc and 1.00 atm pressure from an explosion of 515 g of nh4no3? express the volume in liters to three significant digits?
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Determine the specific volume of superheated water vapor at 15 mpa and 350°c, using (a) the idealgas equation, (b) the generalized compressibility chart, and (c) the steam tables. also determine th
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Calculate the average translational kinetic energy (j/molecule) for a molecule of cl2 at 390 k, assuming it is behaving as an ideal gas.
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Aspirin (acetylsalicylic acid, c9h8o4) is a weak monoprotic acid. to determine its acid-dissociation constant, a student dissolved 2.00 g of aspirin in 0.600 l of water and measured the ph. what was t
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Which of the answer choices best describes why the results of Ernest Rutherford's gold foil experiment led him to propose the concept of a nucleus?
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Eric jogged 31/4 miles on Monday, 5 5/8 miles on Tuesday and 8 miles on Wednesday. Suppose he continues the pattern for the remainder of the week. How far will Eric jog on Friday?
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A scientist observed a fungus and recorded what she saw: • orange in color • found on the surface of a leaf • tightly arranged hyphae • contains cell walls The scientist most likely observed
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Will was diagnosed with acute lymphoid leukemia (ALL). His doctor ordered the use of his own T cells that have been modified in the lab to recognize and destroy his own tumor. What cancer treatment ap
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Some coal emits sulfur when it is burned. Why is this a problem? A. Sulfur is black and coats surfaces with black dust. B. Sulfur forms sulfur dioxide, which acts as an air pollutant. C. Sulfur produc
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H2O(g) → H2 + O2(g) Predict whether the reaction above would have an increase or a decrease in entropy.
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Which of the following demonstrates the role of chemistry in getting ready for school in the morning? A. A hairdryer blows hot air when it is turned on. B. A mirror reflects light in a way that allows
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Given: n = 2.49 mol; V = 1.00 L; P = 143 kPa; R = 8.314 L*kPa/mol* K. What is the temperature in degrees Celsius?
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A first-order reaction that results in the destruction of a pollutant has a rate constant of 0.l/day. (a) how many days will it take for 90% of the chemical to be destroyed?
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"write a balanced equation depicting the formation of one mole of pb(no3)2(s) from its elements in their standard states."
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What fraction of collisions will have sufficient energy to react for a gas whose activation energy is 68 kj/mol at 25°c?
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The ccl4 formed in the first step is used as a reactant in the second step. if 7.00 mol of ch4 reacts, what is the total amount of hcl produced? assume that cl2 and hf are present in excess.
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Calculate the maximum numbers of moles and grams of h2s that can form when 158 g of aluminum sulfide reacts with 131 g of water:
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What is the freezing point in Celsius of a 0.00910 molal aqueous solution of sodium phosphate?What is the freezing point in Celsius of a 0.00910 molal aqueous solution of sodium phosphate?What is the
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Magnesium oxide has the rock salt crystal structure and a density of 3.58 g/cm3. (a) determine the unit cell edge length. (b) how does this result compare with the edge length as determined from the r
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Sopentyl acetate(c 77 h 1414 o 2 2 ) is the compound ressponsabile for the scent in the bananas. interestingly, bees release about 1 micro-gram of this compound whe
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