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What is the freezing point in Celsius of a 0.00910 molal aqueous solution of sodium phosphate?
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Alexa is preparing for a presentation by creating note cards identifying keywords that describe various features of each type of plate boundary. Which words apply to all three of the convergent bounda
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How many milliliters are in 2.6 cubic meters? Please show work and answer has to be in scientific notation
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Complete combustion of 7.50 g of a hydrocarbon produced 23.1 g of CO2 and 10.6 g of H2O. What is the empirical formula for the hydrocarbon ?
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In the reaction blank H2+O2—>2H2O, what conflict should be placed in front of H2 To balance the reaction ?
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A student obtains the following data for his experimental runs for an unknown acid. Run 1 - 0.2541 M, Run 2 - 0.2668, Run 3 - 0.2549 M, Run 4 - 0.2554 M Acid True Concentration is 0.2542 M. What is
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During chemistry, Dan mixes two clear, colorless solution and mixing them produces a yellow precipitate in a clear, colorless final solution as shown by the chemical equation. Pb(NO3)2(aq) + 2KI(aq)
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Fenchone is a ketone found in oil of fennel. if fenchone has m+ = 152 and contains 1 double bond(s) and 2 ring(s); what is its molecular formula?
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Draw the structures, including stereochemistry, for the diols obtained by dihydroxylation of cis−2−butene and trans−2−butene using osium tetroxide.
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If 5% of interstitial sites are filled by impurities in an fcc crystal, what is the concentration of impurities
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Identify the initiation step. identify the initiation step. cl2 ⋄ cl + cl cl + ch3ch3 ⋄ ch3ch2 + hcl cl + cl ⋄ cl2 ch3ch2 + cl ⋄ ch3ch2cl
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Consider a mixture of 50 mol% n-pentane and 50 mol% n-butane at 14 bar. (a) what is the dew point temperature? what is the composition of the first drop of liquid
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How does the instantaneous rate of reaction change as the reaction proceeds? how does the instantaneous rate of reaction change as the reaction proceeds? it stays the same. it increases. it decreases?
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A solution is made by mixing 46.0 l of ethanol. c2h6o, and 54.0 ml of water. assuming ideal behavior what is the vapor pressure of teh solution at 20c
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A sample of co2 gas at 22 degrees celsius and 1 atm has a volume of 2.00 l. determine the ratio of the original volume to the final volume when
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A freshly prepared sample of curium-243 undergoes 3312 disintegrations per second. after 12.0 yr, the activity of the sample declines to 2292 disintegrations per second. the half-life of curium-243 is
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Chemists often use molarity m, in moles/liter, to measure the concentration of solutions. molarity is a common unit of concentration because the volume of a liquid is very easy to measure. however, th
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This reaction was catalyzed by an acid. during the work-up why did you extract with water and not sodium hydroxide?
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A group of elements in the periodic table which have the characteristics of metals in some instances and non metals in other instances are known as
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The discharge reaction that occurs in a nickel-cadmium (nicad) battery is shown below. choose the answer that represents the sum of all the coefficients when this equation is balanced using the smalle
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The 1h nmr spectra of two compounds, each with the molecular formula c13h16 are shown here, identify the compounds
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You have a racemic mixture of (+)-2-butanol and (-)-2-butanol. the (+) isomer rotates polarized light by +13.5∘. what is the observed rotation of your mixture? express your answer in degrees. view a
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When 0.741 grams of a protein were dissolved in 97.6 ml of solution at 30.7 degrees c, the osmotic pressure was found to be 41.3 torr. calculate the molar mass of the protein?
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Liquid chloroform (chcl3) is placed in a closed container and allowed to come to equilibrium with its vapor. if additional liquid chloroform is added to the container at constant temperature, the vapo
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Predict the products when ethoxybenzene (structure shown below) is heated with hot and concentrated hi . if no reaction occurs, draw the starting material.
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How many grams of iron metal do you expect to be produced when 305 grams of a 75.5 percent by mass iron(II) nitrate solution reacts with excess aluminum metal? Show all of the work needed to solve thi
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A wooden object from a prehistoric site has a carbon-14 activity of 10 counts per minute (cpm) compared to 40 cpm for new wood. If carbon-14 has a half-life of 5730 years, what is the age of the wood?
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A solution contains barium ions, silver ions and one type of anion A nitrate B chloride C sulfate D carbonate
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Metals that can be determined by the direct and indirect method of titration
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Examples of buffers used in a complexometric titration
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Students in chemistry lab have been given the assignment to identify an unknown compound using the flame test procedures. The compound they are testing is a white crystal that emits a greenish light w
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(0.387)^3for a metal that has the body-centered cubic crystal structure, calculate the atomic radius if the metal has a density of 7.25 g/cm3 and an atomic weight of 50.99 g/mol.
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Calorimeters can be used in astraightforward manner to measure the enthalpy of a chemical reaction. name two problems that may result in poor heat measurement when calorimeters are used.
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If it is a pure substance, classify it as an element or a compound. if it is a pure substance, classify it as an element or a compound. (a) is a compound, (d) is an element. (a) is an element, (d) is
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A metal weighing 34.526g was heated to 98.0 °C then quickly transferred into a Styrofoam cup calorineter containing 74.365 g of distilled water at a temputure of 27.0°C. The temperature of the water
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This technology makes it easy for doctors to collaborate, which gives patients access to specialists who do not live in their area. - computers -transportation -medical imaging -the internet
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According to cell theory _____. all cells reproduce to create new cells all cells are similar in chemical composition and energy conversion all living organisms are composed of cells all of the above
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Sam toured India with his class. He saw many buildings that reminded him of buildings he saw in Saudi Arabia and in London. What explains the similarity in architecture that Sam saw? A) cultural diffu
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NaCl + H2O → NaOH + Cl2 + H2 Balance the equation. Choose "blank" if no coefficient is needed. NaCl + H2O → NaOH + Cl2 ++ H2
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Which type(s) of bond has, at long distances, an attractive force that varies as 1/r2 between atoms?
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After the electrolysis of aqueous sodium nitrate with the mass of 40%, the mass fraction in the solution was 60%. What is the total volume of developed gases during electrolysis at a temperature of 20
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What is the molar concentration of sodium ions in a 0.3 m sodium phosphate (na3po4, 164 g/mol) solution?
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What can we say about ∆hsolution for solute/solvent combinations with very similar intermolecular forces. it is large in magnitude and positive it is large in magnitude and negative nothing it is sm
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A 0.160-mole quantity of nicl2 is added to a liter of 1.20 m nh3 solution. what is the concentration of ni2 ions at equilibrium? assume the formation constant* of ni(nh3)62 is 5.5 × 108.\
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A 14.0-l helium tank is pressurized to 27.0 atm. when connected to this tank, a balloon will inflate because the pressure inside the tank is greater than the atmospheric pressure pushing on the outsid
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Perform an on-line search to discover how a gardener can remedy soil that is overly basic. Support your answer with a sequence of contributing chemical reactions
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The table below shows the dimension of two colored cubes. Cube: red : side (cm) =4 Mass (g)= 12 Cube:Green: side (cm)= 3 Mass (g) = 10 Which cube is denser? A. Red, because it has more volume and mo
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A ball is dropped from the rest a a height of 7.7 meters about the ground. The ball falls freely and reaches the ground 3.5 seconds later. What is the average speed of the ball?
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What is the expected product when l-propanol is oxidized? A. propanoic acid B. propanone C. propanal D. propene
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If you have 100 ml of a 0.10 m tris buffer (pka 8.3) at ph 8.3 and you add 3.0 ml of 1.0 m hcl, what will be the new ph?
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