The half-life of radioactive element krypton-91 is 10 seconds. if 16 grams of krypton-91 are initially present, how many grams are present after 10 seconds? after 50 seconds?

Why do atoms have different isotopes?

What is the economic importance of phosphorus in Canada or elsewhere in the world?

Which statement about local and global winds is true? Local winds blow from the poles to the equator, whereas global winds blow west to east. Local winds curve due to the Coriolis effect, whereas global winds blow in a straight path.

A widow's peak is a V-shaped area of the hairline in the center of the forehead. The allele for having a widow's peak is dominant to the allele for not having a widow's peak.

If 268.5 grams of Aluminum sulfide reacts with excess water at STP, how many liters of Hydrogen sulfide gas is produced?

How does phosphorus enter the human body?

When a reaction occurs between atoms with ground state electron configuration 1s2 2s1 and 1s2 2s2 2p5 the predominant type of bond formed is

How does heat transfer takes place between any two systems?

Hydrate name of CaCl2 * 8 H2O

Calculate the heat evolved from a mixture of 14.1 l of sulfure dioxide