How many grams of a 1000-gram radioactive sample are left after 3 half-lives?1000 grams 500 grams 250 grams 125 grams 2000 grams

Energy increases heat and causes a phase change from solid to liquid or liquid to solid

Consider the everyday hazardous substances in and around your home. All BUT ONE is a guideline for using, storing and disposing of hazardous household chemicals safely.

Write a word equation to show how electricity breaks down lead bromide into its elements

Can you tell me what is erosion?

Gases Solids compress more easily than liquids or gases. True False

A fog over a lake. what two changes of state must occur to produce the fog? do the water molecules absorb or release energy during these changes of state? what happens to the motion of the water molecules as a result?

Limes have a [H3O+] of 1.3 x 10-2 mol/L. Their pOH is

The human body is 0.0040% iron. How many milligrams of iron does a 165 pound person contain?

Which of the following is the correct Lewis structure for ammonia (NH3) ? Note: Hydrogen and nitrogen have one and five valence electrons respectively.

Which of the following statements is true? A. Particles of a solid have a very orderly, three dimensional arrangement and do not move B. Particles of a liquid change shape and volume C.