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When a sample of phosphorus-32 was placed 1 cm from the detector, the intensity of its radiation was measured to be 491 counts per second. What would its activity be 2 cm from the detector? 5 cm?
Question- What must be true about the change in total potential energy of a collection of atoms for a stable compound to be formed from the elements? Select all true statements.
What proportions of hexane and heptane should be mixed (a) by mole fraction and (b) by mass in order to achieve the greatest entropy of mixing
A buffer is to be prepared by adding solid sodium acetate to 0.10 M CH3COOH. Which of the following concentrations of sodium will produce the most effective buffer
consider one of the resonance structures of the nitrate ionno3oline. what is the formal charge of one of the oxygen
If a 1.22 g piece of gold is hammered into a sheet whose area is 32.4 ft2, what is the average thickness of the sheet? (The density of gold is 19.32 g cm-3.)
When 2.45g of an unknown weak acid (HA) with a molar mass of 85.0g/mol is dissolved in 250.0g of water, the freezing point of the resulting solution is -0.258 degrees C.
What is the Cl ? concentration just as Ag2CrO4 begins to precipitate when 2.0 M AgNO3 is slowly added to a solution containing 0.048 M Cl ? and 0.048 M CrO42-?
Given Mo Energy level diagram for diatomic molecules, which of the following molecular molecular ions has a bond order of 3. Why
Some KCl is dissolved in water at 25 degree Celsius, where it completely dissociates. The vapor pressure of pure water at 25 degree celsius is 28.3 mmHg.
In a study of the effect of temperature on halogen decomposition. 0.50 mol of I2 was heated in a 2.5 L vessel and the following reaction occurred. I2 (g)--> 2I (g)
We did a lab in Chem where we put a liquid into a flask, secured foil on the top and poked a hole in the foil so the vapor could push out the air
The molar heat capacity of a diatomic molecule is 29.1 J/K·mol. Assuming the atmosphere contains only nitrogen gas and there is no heat loss, calculate the total heat intake if the atmosphere warms up by 5°C during the next 50 years in J/mol
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