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Consider two samples of liquid: one mole of water H2O and one mole of ethanol C2H5OH. The density of water is 1.0 g/mL, and the density of ethanol is 0.785 g/mL. Answer each of the following questions by selecting the correct choice.
Which sample contains more molecules? ethanol, water, or neitherwater ethanol neither Which sample has a larger mass? ethanol, water, or neitherwater ethanol neither Which sample contains more oxygen atoms? ethanol water or neitherwater ethanol neither Which sample has a larger volume? ethanol water or neither
When photons with a wavelength of 310. nm strike a magnesium plate, the maximum velocity of the ejected electrons is 3.45 × 105 m/s.
The ideal gas law (PV=nRT) provides relationships among pressure, volume, amount, and temperature of a gas inside a container. If the Kelvin temperature in a container is doubled, which of the following changes may occur?
Estimate how much heat is required to melt a single snowflake using heat capacity relationships. Assume there are 500 water molecules in a snowflake.
The half-life for the second order reaction of a substance A is 55 seconds when [A]o is 0.84 M. What time is needed for the concentration to decrease to 1/4 of the original value.
When 20.0 grams of water is cooled from 20.0 Celsius to 10.0 Celsius, the number of Joules of heat released is
Caffeine with a mass of .265 g was used to prepare caffeine salicylate derivative. How do you find the theoretical yield of caffeine salicyIate
A sample of hydrogen gas was collected over water at 36°C and 855 mm Hg. The volume of the container was 6.50 L. Calculate the mass of H2(g) collected. (Vapor pressure of water = 44.6 torr at 36°C)
There are many types of energy: electrical, kinetic, gravitational potential, chemical, elastic, heat, etc. Choose an object or system in which energy is transformed from one form to another. Describe the energy transformations in this object or s..
Consider the titration of 100.0 mL of 0.100 M HNO3 by 0.200 M NaOH.Calculate the pH after 34.5 mL of NaOH has been added.At what volume (in mL) of NaOH added does the pH of the resulting solution equal 7.00.
Draw a titration curve for both of these peptides. Be sure to label the axes properly, indicate the pKa values, the equivalence points and the buffering regions.
If a sample of 6.022 g of CH4 is enclosed in a 30 L container at 402 K. What is its pressure in atmospheres?The volume is reduced to 12 L at constant temperature. What is the new pressure in atmospheres.
A piece of amber was cut into a rectangular solid measuring 5.18cm by 10.8cm by 2.85m . What is the volume in cubic centimeters
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