Which of the following indicates that an exothermic reaction has taken place?

A. a change in color

B. release of heat and/or light energy

C. cooling of the surroundings

D. absorption of heat by the reaction ... ?

What two factors affect the size of an atom

This element has 1 electron in its 3d sublevel

Both white phosphorus and red phosphorus are made up only of phosphorus atoms. Does this mean they are both pure substances? Could they be compounds?

Na+ion resembles Ne (Neon) atom. Give reason.

In the Investigate, you observed what happened to two pats of butter when the handle of a metal knife was placed in hot water. What conclusion can you draw about how the heat moved through the knife?

What type of bond holds amino acids together?

If the ionization constant of water, kw, at 40°c is 2.92 * 10-14, then what is the hydronium ion concentration and ph for an acidic solution?

Do we get to see all sides of the moon? Why?

What does applied chemistry have to do with making ice cream?

If you visited a virtual Newton's Cradle website or played with the real device, you might have noticed that after a few swings, the balls slow down. The height they reach gets shorter and shorter until they finally stop moving.