Weather balloon at earths surface
A weather balloon at Earth's surface has a volume of 4 L at 285 K and 791 mmHg. If the balloon is released and the volume reaches 4.19 L at 711 mmHg, what is the temperature?
Expected delivery within 24 Hours
The enzymes used in this experiment are only a partially purified pyruvate kinase preparation. This is because complete purification would strip away co-factors and co-enzymes that are necessary for enzyme activities.
A solution is made by mixing 500 mL of .167 M NaOH with 500 mL of .1 M CH3COOH. Calculate the equalibrium concentrations of H+. CH3COOH, CH3COO-, OH- and Na+.
A chemist is commissioned to produce 50,000 liters of 0.550 M aqueous phosphoric acid. The chemist can purchase solid, 98.64% pure, phosphoric acid to dissolve in water. How many grams of this reagent are required?
For each of the following three questions 25.0 mL of 0.100 M pyridine (Kb = 1.70 x 10-9) is titrated with 0.100 M HCl. For each question calculate the pH of the final solution after the indicated amount of HCl has been added.
What is the molar mass of a nonpolar molecular compound if 5.52 grams dissolved in 36.0 grams of benzene begins to freeze at -1.87oC? The freezing point of pure benzene is 5.50 oC and the freezing point depression constant, Kfp, is -5.12oC/m."
Sugar (82.00 grams; molar mass 342.3 g/mol) was dissolved in water. The freezing point of the solution was determined to be -3.60 deg C. How many grams of water were used to make the solution? The freezing point depression constant Kf for water is
If copper has a photoelectric threshold wavelength of 279 nm, calculate the velocity (m/s) of the electron emitted when copper is illuminated with light with a frequency of 2.33 × 1015 Hz.
What is the molarity of a solution that contains 35.0 g of vitamin B1 hydrochloride (molar mass = 337 g/mol ) in 110 g of solution?
1945225
Questions Asked
3,689
Active Tutors
1424552
Questions Answered
Start Excelling in your courses, Ask a tutor for help and get answers for your problems !!
Clearly identify the US, UR, CS, and CR. Briefly describe the example, and then discuss the variables that contribute to the strength of the conditioning,
An outcome of stress or crisis-is the degree to which functioning has changed over an extended period and may be measured
According to Erich Lindemann, a psychiatrist and researcher, who first used the term acute grief said it was not a psychiatric disorder,
This is the extent to which a learner continues to perform the target behavior after a portion or all of the intervention responsible for the behavior's initial
A cluster of symptoms including somatic distress, feelings of guilt, hostility, disorganization, and behavior changes experienced by the surviving family
In three sentences summa te paragraph to answer the following questions Vygotsky's theory: An evaluation Vygotsky offered a fresh perspective
When using websites to learn more about? products, what do celebrity endorsements and positive reviews provide in the persuasion? process?