When electrons are filling energy levels, the lowest energy sublevels are

occupied first. This is

A. None of these

B. The Aufbau principle

C. Hund's rule

D. Conservation of energy

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Solids, liquids, and gases are three common states of matter. Which of these states of matter can flow? A. gases only B. gases and liquids only C. liquids only D. gases, liquids, and solids

Carbon-14 has a half-life of 5,730 years. Suppose a fossil from a mammal contains one-fourth of its original amount of carbon-14. How old is the sample?

Which best describes what happens when a person sees an orange T-shirt? A. The T-shirt radiates all colors of light except orange to human eyes. B. The T-shirt absorbs orange light from human eyes. C.

Gerald's science teacher mixed room temperature samples of hydrochloric acid and sodium hydroxide in a large beaker.

The ir spectrum of which type of compound will not show evidence of hydrogen bonding?

Bases in solution produce what type of ions? a. sulfide ions b. chloride ions c. hydroxide ions d. hydronium ions

How many earth minutes are represented by 0.1 martian sol

Which of the following shows three elements in order of decreasing conductivity? A. Zn, Pd, Ag B. Pd, Ag, Zn C. Ag, Pd, Zn D. Zn, Ag, Pd Which of the following is the name of a metal? A. K B. Potassium chloride C. Potassium D. KCI

Which of the following describes nuclear fission? It requires extremely high temperatures to begin the reaction. It involves the combining of nuclei. It involves bonding electrons. Its chain reactions can be initiated by neutrons.

Which is a quantitative observation A. 15 m long B. red color C. rough texture D. strong odor