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An object has a mass of 24 grams and students find it hard to calculate the density of it because of its shape. They decide to use the volume displacement method to determine the density of the object. They use a 50 ml graduated cylinder and fill it with 25 ml of water. When they lower the object carefully into the water, the level of the water rises to 31 ml. What is the density of the object?
A lump of copper is heated with 225 J of energy. Its temperature rises by 11.5 oC. How many grams does this lump weigh
A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.33 moles of KOH into 800 mL of solution. What is the pH of this buffer? Ka = 5.9 × 10-6 for HA.
question in the dumas method for determining nitrogen content in organic compounds a sample is treated with cuo at high
Suppose that you are climbing a high mountain and the oxygen partial pressure in the air is reduced to 75 torr. Estimate the percentage of the oxygen carrying capacity that will be utilized,
Determine the volume of H2S (at 375 K and 1.20 atm) needed to produce 55.0 g of S. Assume that there is excess SO2 present. 2 H2S(g) + SO2(g) ? 3 S(s) + 2 H2O(g)
Problem- As part of the formation of chromated copper arsenate (CCA), As2O5 is dissolved in an aqueous solution. A product formed in the process is Arsenic acid (H3AsO4). Show the balanced chemical reaction by which it could be formed
Question- What might prevent a restriction enzyme from cutting the DNA of the organism from which they are derived
lead (II) sulfide (PbS) has a Ksp of 3.0 x 10^-28 . what is the concentration of lead (II) ions in a saturated solution of PbS
As protons transported into cell, ATP synthesis can be coupled to this process by ATP synthase. At 100% efficiency, under conditions above, how many proteins must be transported to synthesize one molecule of ATP?
For the following electrochemical cell Cu(s)|Cu2 (aq, 0.0155 M)||Ag (aq, 1.50 M)|Ag(s) write the net cell equation. phases are optional. do not include the concentrations
what is the theoretical and percent yields of ethanol if 648 grams of sucrose undergoes fermentation and 349 grams of ethanol is obtained.
My assignment is to writing a well developed paragraph discussing the reliability, credibility, and/or relevance of the methods.
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