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A 0.202 g sample of an Al?Ca alloy reacts with an excess of HCl(aq) to produce 0.0179 g H2(g). What is the mass percent of Ca in the alloy? The unbalanced equations are given below. (Hint: Let x = mass of Ca in the alloy in grams. Question 115 in your textbook is similar.)Al(s) + HCl(aq) ? AlCl3(aq) + H2(g) Ca(s) + HCl(aq) ? CaCl2(aq) + H2(g)
If both enzymes catalyze their reaction with similar rates, explain why the hydrolysis of the starch molecule is accelerated when both enzymes act together.
The probability that the annual peak will equal or exceed the median value in any single year. The average return period of the median value.
Complete and balance the following if a reaction occurs. Write your answer as net ionic equation and include physical states of all compounds (including for water).
Calculating the Moles of Aspirin, The molecular formula for aspirin is HC9H7O4, Calculate the molecular weight for aspirin
Which one of the following does not react with aqueous sodium hydroxide?
The pressure of the gas is 365 torr, and the temperature is 45, ^{\circ}C. If the temperature changes to 60\, ^{\circ}C with no change in volume or amount of gas, what is the new pressure, P_2, of the gas inside the container
Calculate the amount of energy in kilojoules needed to change 117g of water ice at -10degrees Celcius to steam at 125 degrees Celcius
Lethality of Carbon Monoxide, Sulfur Dioxide and TNT Air monitoring provides the following contaminant concentrations at the approximate center of a fire scene in which acres of automobile tires are burning:
Metals such as magnesium and zinc react with dilute sulfuric acid to give hydrogen, according to the equation: M (s) + H2SO4 (aq) -------> MSO4 (aq) + H2 (g) When 5.00 g of a mixture of powdered magnesium and zinc were dissolved in diluted sulfuri..
Which of the following is false? A. Molecules with strong intermolecular forces have higher surface tension. B. Molecules with strong intermolecular forces have higher viscosities.
Which of the following is true about an endothermic reaction?
what problem might there be if you attempted to perform the kinetic experiment at -20 degrees celsius
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