A sample contains 6.25 percent parent isotope and 93.75 percent daughter isotopes. If the half-life of the parent isotope is 58 years, how old is the sample?

Which best explains the relationship between evaporation and temperature? a) A liquid evaporates slower at lower temperatures because the molecules are more spread apart and are not pushed as easily from the liquid's surface.

Provide three different types of examples of how minerals form on earth

When you exhale into a cold window pane, water vapor in your breath condenses on the glass. where does the water vapor come from?

Write the common names of trichloromethane and one of their uses?

Neap tides, relatively weak tides, occur when the Moon is in position (s) A) A. B) B. C) A and C. D) B and D.

1.4 Explain why it is important to support individuals to challenge information about services that may present a barrier to participation

Which describes energy changes during nuclear fission? A very large amount of energy is produced from a tremendous mass. EEUU A very large amount of energy is produced from a very small mass. G .

A 0.75mol calcium carbonate (CaCO3) pellet has what mass?

The pH of the acid in the stomach is 2. When a person has heartburn, the acid in their stomach is coming up the esophagus (lower throat) and burning the lining of the esophagus. Why would a person take an Alka Seltzer tablet for heartburn?

Calculate the photon energy (in joules) for the light emitted from the hydrogen atom if ninitial = 4 and nfinal = 2.