Uranium-238 decays very slowly. its half-life is 4.47 billion years.

What percentage of a sample of Uranium-238 will remain after 13.4 billion years?

i have to test after 3 days!

The number of significant figures in the measurement 0.01305 kg is a. 5. b. 3. d. 4. c. 2

Which of these substances has the strongest intermolecular forces? A. H2O B. H2S C. H2Se D. H2Te

If this pattern of change in the allele frequencies continued over several more generations, what might eventually happen to the frequency of each allele?

What are written to the right of the arrow in a chemical reaction

Whats the mass of a cube of aluminum that is 4.0 cm on each side? the density of aluminum is 2.7g/cm ^3

The molar mass of water (H2O) is 18.02 g/mol. Yun needs 0.025 mol H2O for a laboratory experiment. She calculates that she needs 72.0 g H2O for the experiment. Yun's calculation was incorrect because she set up her unit conversion incorrectly.

I'm doing isotope homework and I need the find the number of protons, neutrons, and electrons first one is chromium-58 and chromium-63

Trisha and her lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. In one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid.

what mass of magnesium is required to react with excess nitrogen to produce 0.500 mol magnesium nitrade

Silver chromate is sparingly soluble in aqueous solutions. the ksp of ag2cro4 is 1.12 * 10-12 m3. what is the solubility (in mol/l) of silver chromate