A fluorescent light tube usually contains

A. a vacuum.

B. oxygen.

C. mercury vapor.

D. light-emitting diodes.

The stronger the base is the closer the ph will be to what

An explanation of observed facts and phenomena is a: a. experiment b. none of the answers c. theory d. law

Which elements have the quantum numbers (4,3,-2,+1/2) and (5,2,-1,-1/2)

Which of the following is true about acids? a. Acids give foods a bitter taste. b. Aqueous solutions of acids conduct electricity. c. Acids have a pH value greater than 7. d. all of the above

Which of the following elements is an alkall metal?

If an ice cube melts at 0ºC but water also freezes at 0ºC, what is the difference between melting and freezing in terms of ... 8. The energy involved in the phase changes and 9. The motion of the particles of the substances during the phase changes?

What is the element Ar classified as in the periodic table?

Using the clausius clapeyron equation determines the heat of vaporization from experimental measurements of vapor pressure. the vapor pressure of dichloromethane is measured as a function of temperature and the results are tabulated.

Why is it important for people to understand how to properly dispose of waste in a watershed?

As you travel from a solid to a gas, energy is being absorbed or given off?