True or False. Liquids have a fixed temperature, but no fixed shape.

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.