A scientist who wants to date materials older than 40,000 years would most likely use.

What is a controlled variable, a manipulated variable, and a responding variable in a science experiment?

Compare the wavelengths of an electron (mass = 9.11 * 10-31 kg) and a proton (mass = 1.67 * 10-27 kg), each having (a) a speed of 8.83 * 106 m/s and (b) a kinetic energy of 7.81 * 10-15 J. Enter your answers in scientific notation.

The four isotopes of lead are shown below, each with its percent by mass abundance and the composition of its nucleus. using these data, calculate the approximate atomic mass of lead.

6. List three threats to the health of trees in the United States.

How is the ideal gas law usually written?

What are the phase transitions in which heat energy is gained?

A cylinder contains 4.0 g of nitrogen gas. A piston compresses the gas to half its initial volume. Afterward, by what factor has the mass density of the gas increased?

The balanced equation below represents the reaction between magnesium metal and hydrochloric acid to produce aqueous magnesium chloride and hydrogen gas. Mg (s) + 2HCl (aq) = = > MgCl2 (aq) + H2 (g) A piece of Mg (s) has a volume of 0.

What is the molarity of a solution prepared by dissolving 33.4 g of sodium chloride in some water and then diluting the solution to a volume of 300.00 mL?

Think about how pressure relates to volume and how gas behavior would change in different volumes. Which of the following will have the largest positive value for Sº? A) 1 mole of helium gas at 1 atm pressure.