what is the efficiency of a machine if your work on the machine is 1,200 j and the machines output work is 300j

Metals show a wide range of chemical behavior. Give examples of that variation by describing some common properties of calcium, gold, iron, and sodium.

How many protons and neutrons does br-1 have

ead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0012 %Pb by mass. How much of the water (in mL) contains 150 mg of Pb? (Assume a density of 1.0)

What determines the amount of energy an electron has?

If 0.78% of a radioactive substance remains, then how many half-lives have passed? 3 7 6 4

List at least two chemical reactions that resulted in a yellow, orange, or red precipitate. For these reactions, list the possible chemical name of the precipitate.

You place air in a sealed can at stp. ypu triple its absolute temperture (K) while leaveing the volume constant. what happenes to the pressure

A current of 10.4 a is applied to 1.25 l of a solution of 0.552 m hbr converting some of the h + to h2 (g), which bubbles out of solution.

What is a greenhouse gas?

Which statement best describes a mole?