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Which of the following is true about the photoelectric effect? a) The number of electrons emitted increases with intensity of light, regardless of the frequency. b) The number of electrons emitted increases with the intensity of light, but only if the frequency of light is above the threshold frequency. c) The number of electrons emitted increases with the intensity of light, but only if the frequency of light is below the threshold frequency. d) The kinetic energy of the emitted electrons depends only on the intensity of the light.
How many milliliters of 0.270 M Na2S2O2 solution are needed to titrate 2.303 of I2 according to the equation below
What ions and/or molecules are present in relatively large proportions in a solution of a strong acid HI (aq)?
The molar enthalpy of vaporization of water is 44.012 kJ mol-1. Under an applied pressure of 1 atm, water boils at 373.15 K. The safety value of a kitchen pressure cooker is set to release when the pressure reaches 2 atm
the phosphorylation of 2 moles of ADP to ATP and has a deltaG= -135 kJ/mol. What is the deltaG for the conversion of glucose into lactic acid?
Caculate the wavelength of light( in nanometers) that is absorbed when the electron in a He+ ion goes from the n=2
At 63.5oC the vapor pressure of water is 175 torr and that of ethanol (C2H5OH) is 400 torr. A solution is made by mixing equal masses of water and ethanol.
Calculate the hydrogen ion concentration for an aqueous solution that has a pH of 3.45.
A solution of I2 was standardized with ascorbic acid. Using a 0.100 g sample of pure ascorbic acid, 25.32 ml of I2 were required to reach the starch end point.
when hydrochloric acid comes in contact with potassium permanganate, what dangerous chemical is released?
Calculate the change in the standard molar entopy for the formation of gaseous nitrogen dioxide from gaseous nitrogen and gaseous oxygen.
A 45 kg person drinks 530. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 15% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake?
How many equivalent Lewis structures are necessary to describe the bonding in NO2F ?
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