Which of the following is true for a dry cell? a) It contains boric acid, which is a solid acid. b) The graphite rod does not undergo reduction, even though it is the cathode. c) It can be recharged many times. d) all of the above

Daisy's dad has a mass is 70 kg, which is twice Daisy's mass. What is his weight? (Note, be sure to write in the unit. The unit is N)

The vapor pressure of water at 50.0 c is 12.33 kpa. What is this value in millimeters of mercury?

What items are minerals or contain minerals

What should you do before you begin to plan a scientific investigation?

If you are studying cells and heredity, you are most likely taking a chemistry class. a. True b. False

Hemoglobin, a protein in red blood cells, carries o2 from the lungs to the body's cells. iron (as ferrous ion, fe2+) makes up 0.33 mass % of hemoglobin. if the molar mass of hemoglobin is 6.8 Ã 104 g/mol, how many fe2 + ions are in one molecule?

What could you predict about a methane molecule that would most likely be made by using both the quantum model of the atom and John Dalton's model?

What is the molar mass of an unknown hydrocarbon whose density is measured to be 1.97 g/l at stp?

Which is an example of flow of heat through conduction

Which of the following is an extensive physical property of matter? volume viscosity odor density