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The density of copper decreases as temperature increases. Which statement accurately describes the changes in a sample of copper when it is warmed from room temperature to 95 degree Celcius.
a. The sample will become lighter. b. The sample will become heavier. c. The sample will expand. d. The sample will contract.
How many moles of HNO3 are present if 0.141mol of Ba(OH)2 was needed to neutralize the acid solution
A close system containing 10^-3 NaHCO3 and 10^-4.7 NaCN. What was the pH and alkalinity of the system
Suppose you have a mixture of the following solids: iodine (I2), benzophenone (H5C6-C(=O)-C6H5), benzoic acid (C6H5-C(=O)-OH), and oxalic acid (HOOC-COOH). You dissolve a small quantity of the solid mixture in ethanol and spot the solution on a TL..
Assign an oxidation state to each atom in each polyatomic ion. Express answers as a signed integer. 1. CrO4^2- 2. Cr2O7^2- 3. PO4^3- 4. MnO4^-
Using triethylamine with alkyl halides such as iodoethane, 1-bromopropane, 2-bromopropane, describe how steric hindrance affects the rate of an Sn2 reactions, Use specific chemical examples to support the conclusion
Determine the dissociation constants for the following acids. Express the answers in proper scientific notation where appropriate
Suppose you have 0.3562g of Na2C2O4 and is dissolved in 250 mL volumetric flask. If 10 mL of this solution requires 48.36 mL of KMnO4 solution for titration, what is the molarity of the permanganate solution.
At a certain temperature the solubility of strontium arsenate, Sr3(AsO4)2, is 0.0640 g/L. Explain what is the Ksp of this salt at this temperature
Acetone, C3H6O, and ethyl acetate, C4H8O2, are organic liquids often used as solvents. At 30 degrees C, the vapor pressure of acetone is 285 mmHg and the vapor pressure of ethyl acetate is 118 mmHg.
What is the rate of the above reaction? What is the closest numerical value of K for the above reaction? What are the units for the rate constant for the reaction?
A stock solution is prepared by adding 20 mL of 1.31 M AlCl3 to enough water to make 74 mL. What is the Al3+ concentration of 45 mL of the stock solution?
Hydrogen and iodine gases react to form hydrogen iodide gas. H2(g) + I2(g) → 2 HI(g) At a certain temperature and pressure 0.70 L of H2 reacts with 0.70 L of I2.
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