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A student completed the experiment but found that the total amount of material recovered weighed more than the original sample. what is the most likely cause of this error and how may it be corrected?
A student found that the mass of the naphathalene collected (0.055), was less than the mass determined by difference (0.404). what would account for the smaller amount of naphthalene collected?
Mothballs in a clothes closet gradually disappear over time. What happens to this material?
If 20.0L of neon gas exerts a pressure of 125 psi at 423 k , what is the number of moles of gas?
a 75ml mixture is prepared with 30ml of potassium iodide of concentration 0.180m 15ml of na2s203 of concentration
Explain what is the dominant form of alkalinity in natural water at pH 7. Explain what are the forms present at pH 10.5? Total alkalinity = 100mg/l CaCO3. Explain mathematically not from graph.
When drawing the lewis structure of TeCl4, WHY does Te have a lone pair. It's already connected to four Cl atoms and has 8 electrons.
The blank solution used to calibrate the spectrophotometer s 10.0mL of 0.2 M Fe(NO3)3 diluted to 25.0 mL with0.1 M HNO3. Why is this solution preferred to simplyusing de-ionized water for the calibration
Consider the following reaction in a closed reaction flask. If 1.50 atm of gas A is allowed to react with 0.500 atm of gas B and the reaction goes to completion at constant temperature and volume, what is the total pressure in the reaction flask a..
N2O4 is introduced into an empty 2.14L container, what are the partial pressures of NO2 and N2O4 after equilibrium has been achieved at 45 degree celsius? Pn2o4, Pno2=?
The initial pH of chloroacetic acid is 1.90, (which I found from using the quadratic equation to find x in a RICE table because I was given the initial concentration of 0.124M and told to find the pH of a 10.0 mL solution.)
How does concentrated H2SO4 catalyze the esterfication reaction of ethanol and acetic acid to form ethyl acetate. Explain.
87.0% of the heat produced by the boiler is used to create saturated steam at 20.0 bars (absolute) from liquid water at 24° C. If 175 m3/h of steam is needed, what rate of heat does the boiler output
The specific heat of liquid bromine is 0.226J/g-K. How much heat (J) is required to raise the temperature of 10.0mL of brmine from 25.00D to 27.30C? The density of liquid bromine: 3.12g/mL
A weight lifter holds 900 N (about 200 lb) over his head. Is he doing work on the weights? Did he do any work on the weights? Explain. In general terms, how is energy defined?
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