Which of the following elements has the lowest electronegativity?

Ca

Sr

Fr

Pure water has a hydrogen ion concentration of 1 * 10-7 M and a pH of 7. A student measures a basic solution and finds that it has a hydrogen ion (H+) concentration of 1 * 10-3. Explain why the student must have made an error in her measurement.

Oxygen s atomic number is 8. this means that an oxygen atom has a. eight neutrons in its nucleus. c. eight protons in its nucleus. b. a total of eight protons and neutrons. d. a total of eight neutrons and electrons.

A sample is a mixture of kcl and kbr. when 1.169 g of the sample is dissolved in water and reacted with excess silver nitrate, 1.892 g of solid is obtained. what is the composition by mass percent of the mixture?

How much carbon is stored in the atmosphere as co2

Calculate the energy absorbed when 6.20 g of aluminum is heated from 10.0°C to 65.0°C if the specific heat of aluminum is 0.900 J/g°C

You need to produce a buffer solution that has a pH of 5.40. You already have a solution that contains 10. mmol (millimoles) of acetic acid.

What percentage of the filtrate's water that enters bowman's capsule is reabsorbed into the blood? select one: a. 99 percent b. 80 percent c. 50 percent d. less than 25 percent?

Which choice represents a pair of resonance structures? Note that lone pairs have been omitted for clarity. View Available Hint (s) Which choice represents a pair of resonance structures? Note that lone pairs have been omitted for clarity. a.

mmonia, NH3, is used in numerous industrial processes, including the production of pharmaceuticals such as sulfonamide and antimalarials and vitamins such as the B vitamins.

2 NaOH what are the number of atoms