The scientist finds fossilized remains of other species in the same rock layer as the trilobite. What can the scientist conclude about

these other fossils?

Which of the following is a possible definition of a base? Select one: a. A substance that increases the concentration of hydronium ions in a solution b. A compound that is a hydrogen ion acceptor in an acid-base reaction c.

Which electrical circuit is designed to produce light? A) an MP3 player B) a generator C) a flashlight D) an air conditioner

How many atoms in carbon

What type of formula represents the simplest whole number ratio of atoms of the elements in a compound? (1) molecular formula (2) condensed formula (3) empirical formula (4) structural formula

Which element would have the largest radius; Br or Se? Explain

Tidal power plants work best in small estuaries or intels that border the ocean. True or false?

Which expression represents the percent by mass of nitrogen in NH4NO3?

PD-99 has a half-life of 22.3 hours. How many grams of a 89.8 gram sample would have decayed after exactly three half-lives?

When is heat exchanged during the refrigeration cycle? During the initial condensation and final expansion of the refrigerant. During the initial expansion and final condensation of the refrigerant.

Determine the [oh-] of a solution that is 0.125 m in co32-.