Which of the following would describe the interaction between two north poles of a magnet?

attract

repel

stay unchanged

it depends

What statement is one of the three parts of a cell theory? A. All cells come from another cell B. Cells grow like crystals C. Cells assemble themselves from whatever is around D. Plant and animal cells are exactly alike

Is a polar molecule an ionic or covalent compound?

Which of the following is always valid? Choose only ONE answer. 1. W = - P ∫ dV, for the calculation of work in a mechanically-reversible piston-cylinder arrangement 2. For any fluid undergoing a change in pressure, Cp = dH/dT. 3. ΔH = ΔU + Δ (PV) 4.

The osmotic pressure, Π, of a solution of glucose is 83.1 atm. Find the molarity of the solution at 298 K. Express the molarity to three significant figures and include the appropriate units.

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?

To what temperature must it be raised to triple the rms speed of its molecules?

Molar mass of Fe2 (CO3) 3

If you put a straw into a glass of water, the straw looks to be bent, although nothing has physically happened to the straw. The term that describes this property of light is A) absorption. B) diffraction. C) reflection. D) refraction.

A constant volume of gas is heated from 25.0ºC to 150.ºC. If the initial pressure was 760. torr, what is the final pressure?

The concentration of 1130 + in a solution is found to be 1.75 X 10-8 M 250C. Find [OH].