A crystallographer measures the horizontal spacing between molecules in a crystal. The spacing is 19.78 nm. What is the total width of a crystal in millimeters 105 molecules across? Write your answer as a decimal.

Less than one-half of Venus' surface is composed of low lying volcanic plains with large amounts of flowing lava True or False?

Most lakes have rivers flowing out of them, carrying water to the ocean. However, some lakes, including Great Salt Lake and the Dead Sea, have no outlet. Water flowing into these lakes leaves only through evaporation.

Which phrase is the best description of an artificial satellite A. A rocket that has a very small amount of thrust B. A spacecraft that orbits a celestial body C. A telescope that allows you to see distant planets D.

Why is water an excellent solvent for most ionic compounds and polar covalent molecules but not for non-polar compounds? A) Water is a polar molecule. B) Water has a charge like an ion. C) Water is a deionizing substance.

A block of wood has a mass of 120g and a volume of 200cm what is the density

Using special equipment which layer of the sun atmosphere is visible during a total solar eclipse

The characteristic flame test colors of metal ions are due to atomic emission spectra. Duscuss the relationship between the absoption and emission of light and the factors responsible for flame test colors.

Should a bartender use ice and scoop directly from ice machine or use an ice holding device and scoop to make drinks and refill drinks from

What classification should this reaction have? 4Al + 3O2 → 2Al2O3

If you start with 100 grams of a radionuclide, how much will you have after two half-lives have passed?