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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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A sample of an ideal gas has a volume of 3.30 l at 13.40 °c and 1.80 atm. what is the volume of the gas at 24.60 °c and 0.993 atm
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A reaction in which a→products was monitored as a function of time and the results are shown below.
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Draw the lewis structure for the sulfur dioxide so2 molecule. be sure to include all resonance structures that satisfy the octet rule.
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Draw a lewis structure for each compound. include all nonbonding pairs of electrons.(a) ch3coch2chchcooh (b) ncch2coch2cho (c) ch2chch(oh)ch2co2h (d) ch2chc(ch3)chcooch31-33 draw a line–angle formul
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Calculate the solubility (in m units) of ammonia gas in water at 298 k and a partial pressure of 8.00 bar . the henry's law constant for ammonia gas at 298 k is 58.0 m/atm and 1 bar=0.9869 atm.
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Capillary action: draws water from the soil to the surface helps the roots of plants obtain water is the upward movement of water between particles of soil all of the above
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Using the bond energies below, calculate an estimate of δhrxn for the hypothetical gas phase reaction: a-c≡n + b2 => b-c≡n + ab
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An object with a mass of 0.255 kg and density of 2.89 g/cm3 measures 34 mm in length and 46 mm in width. What is the height of the object?
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You wish to dispose of 25 ml of 70% phosphoric acid. where will you do so? select the one correct answer.
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0 ml of a 1.30 m solution is diluted to a volume of 258 ml. a 129-ml portion of that solution is diluted using 151 ml of water. what is the final concentration?
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Redict the major product formed when the compound shown below undergoes a reaction with one equivalent of br2 in h2o at a high temperature.
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Standard reduction potentials for zinc(ii) and copper(ii) the standard reduction potential for a substance indicates how readily that substance gains electrons relative to other substances at standard
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Which of the following statements is true? a. most metals cannot be stored in solid b. most metals cannot be stored in liquid form c. most metals cannot be stored in gaseous form. d. most metals can b
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A nurse practitioner prepares 450. mL of an IV of normal saline solution to be delivered at a rate of 90. mL/h. What is the infusion time, in hours, to deliver 450. mL?
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The insecticide DDT was introduced in the 19t0s, and the rates of malaria dropped significantly. DDT was later found to be toxic to birds and other animals, and it was discontinued in 1964. As a resul
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The teacher prpsres2.59 liters (L) of a salt solution fir a class experiment. How many quarts are in 2.50 L?
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___in Earth’s___ is the up and down movements of plastic-like material within that layer. A)conduction;crust B)convection;crust C)conduction;mantle D) convection;mantle
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Why does conduction occur in solids and liquids easier compared to gases? Question 9 options: Because the particles in gases are closer together and move faster. Because the particles in gases rarely
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A water initially contains 40 mg/l of mg2+. the ph of the water is increased until the concentration of hydroxide ion (oh) is 0.001000 m. what is the concentration of magnesium ion in this water at th
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Calculate the molarity of a solution that contains 20.275g calcium bromide dissolved in 575 mL of solution
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A 0.12 m (molal) solution of nacl in water has a freezing point which differs from that of pure water by 0.4oc. determine the expected freezing point difference of 0.06 m (molal) nacl in water.
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Write the balanced equation for the reaction first. Sulfur combines with iron to form iron(II) sulfide. In an experiment, 15.24 g of Fe are allowed to react with 17.34 g of sulfur What is the limiting
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F 2.0 g of copper(II) chloride react with excess sodium nitrate, what mass of sodium chloride is formed in this double replacement reaction? Write the balanced equation for the reaction first.
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The equilibrium of 2H 2 O(g) 2H 2 (g) + O 2 (g) at 2,000 K has a Keq value of 5.31 x 10-10. What is the Keq expression for this system?
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You need to dissolve cacl2 in water to make a mixture that is 42.0% calcium chloride by mass. if the total mass of the mixture is 815.7 g, what masses of cacl2 and water should be used?
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Write the molecular formula for a compound with the possible elements C, H, N and O that exhibits a molecular ion at M+ = 84.095 I understand the concept of adding together the specific mass C=12.000,
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From this map, determine the geometry for how two acetonitrile molecules would interact with each other.
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To help finance a major expansion, castro chemical company sold a noncallable bond several years ago that now has 20 years to maturity. this bond has a 9.25% annual coupon, paid semiannually, sells at
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The half life of the reaction is 1.60 × 105 s at 444 k. what is the rate constant when the initial [ch3nc] is 0.030 m?
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