Uranium-235 has a half-life of 713 million years, while carbon-14 has a half-life of about 5,730 years. Which isotope would be more useful for dating a fossil from Precambrian time?

The spines of a cactus protect it from animals.

What is the difference between a calorie and calorie value

In most chemical reactions the amount of product obtained is

Which statement explains how commercial land use negatively impacts watersheds? O Chemicals in fertilizers run off into water and cause algae blooms. O Production of clothing items makes pollutants that contaminate the water.

Which ion has the largest ionic radius? a. cl b. cl- c. na d. na+?

A chemistry student needs 90.0g of glycerol for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of glycerol is 1.26·gcm-3. calculate the volume of glycerol the student should pour out.

A sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution has a density of 1.329 g/cm3. Calculate (a) the mass percentage, (b) the mole fraction, (c) the molality, (d) the molarity of H2SO4 in this solution.

Darwin visited the Galapagos Islands several times. He observed some very unusual species. One species of bird, the finch, interested him. He observed some differences in the finches living on different islands.

Why does land heat up more faster than water?

Which gas law has assumptions of a fixed amount and temperature of a gas