As a sample of the radioactive isotope 131I decays, its half-life (1) decreases (2) increases (3) remains the same

Why plants have specialized organelles animals and bacteria do not. Do those organelles serve a special function not needed in the other organisms?

A mixture of oxygen, hydrogen and eater vapor has a total pressure of 684 mm Hg. The partial pressure of oxygen is 380 mm Hg and that of hydrogen is 0.100 atm. That is the partial pressure of the water vapor?

In the scientific method, analysis should follow

Which one of the quantum numbers does not result from the solution of the schrodinger equation?

For the elements whose electron configurations end as follows, state the period and the group to which each element belongs: 6s2, 3s2 3p5, 4s2 4p2

This chart shows discrpitions of the atoms for four different substances. Which substance is a solid

What is habitat destruction?

Nancy wants to find out how the steepness of a hill's slope affects the amount of soil that erodes from it. She has soil, a long pan, and a pile of books with which to build a model hillside. She has a watering can to model rainfall.

What is the function of the ribosome

How much energy, in joules, does 150.0 g of water with an initial temperature of 25 C need to absorb be raised to a final temperature of 75 C