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Assume the last digit of the following numbers is known to plus or minus 1. Perform the indicated divisions and estimate the maximum uncertainty for each result. Express the answer as a single number with an uncertainty limit. a) 103/101 b) 101/99 c) 99/101
Consider an electron in a one-dimensional box the size of a nucleus with one proton Hydrogen, 10-14m. a) Approximate its ground state energy b) Approximate the coulombic energy V between the proton and electron from V = -e2/4pir
Duplicate 0.50 g samples of a finely powdered gold ore are digested in an HCl/HNO3 mix and evaporated to dryness. Each sample is then treated with an additional 15 mL of HCl and diluted with an additional 40 mL of water.
calculate the percent of a strontium sample left after 100 years. the half-life of strontium-90 is 28.1
A student mixes 100.0 mL of 0.500 M AgNO3 with 100.0 mL of 0.500 M CaCl2. Write the balanced molecular equation for the reaction. Write the net ionic equation for the reaction.
Acetylene, C2H2, is a gas commonly used in welding. It is formed in the reaction of calcium carbide, CaC2, with water. Given the thermochemical equations, calculate the value of ?H°f for acetylene in units of kilojoules per mole.
Sketch a titration curve of what the titration of the dry acid vs. sodium hydroxide might look like and explain the diagram.
The calibration points for the Martian temperature scale are the usual melting point of ice and boiling point of water, which are assigned the values 0 °M and 80 °M. the normal body temperature of humans is 98.6 °F. What is this temperature in °M
A) How many ions will this compound create in aqueous solution ? B) What is the coordination number of chromium ?
Calculate the total concentration of dissolved cadmium (i.e. sum of the concentrations of free Cd 2+ and Cd-chloride complexes) in a 0.1M NaCl solution that is in equilibrium with otavite at atmospheric PCO2 and a pH of 8.5. To what extent does ch..
The filter is heated to 550 oC, and the filter plus residual then weighs 37.0 g. Another 10.0 L sample of the same water is evaporated, without filtering, yielding a residual mass of 40.0 g.
no2nbspreacts with f2nbspto give no2nbspaccording to the following overall reaction2no2g f2g rarr 2no2fgwhat is the
Calculate the increase of entropy (in J/K) when 72 g of ice melts at 0 ºC and 1 atm. (The heat of fusion for ice is 6,000 J/mol.)
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