All the following are signs of chemical reaction may have taken place in a piece of glass except:

A. glass changes colors

B. new substances beside glass are form

C. shape of glass changes

D. energy is used or given off

In the ground state, all atoms of group 15 elements have the same number of A) valence electrons B) electron shells C) neutrons D) protons

Bond formed when electrons are shared between atoms?

Urea, a compound formed in the liver, is one of the ways humans excrete nitrogen. The Lewis structure for urea is H N H H C H O N Using hybrid orbitals for carbon, nitrogen, and oxygen, determine which orbitals overlap to form the various bonds in

What happens if the amount of energy that is absorbed by the reactants is less than the activation energy? The reaction does not occur. The reaction occurs very quickly. The reaction occurs very slowly. The reaction occurs spontaneously.

Which of these best defines climate? Atmospheric condition at one place and time Day-to-day condition of the atmosphere Long-term condition of the atmosphere Current atmospheric condition

What is true of an acidic solution at room temperature?

Why does a higher concentration make a reaction faster? There are more collisions per second and the collisions are of greater energy. Collisions occur with greater energy. There are more collisions per second.

A property of metals is high thermal conductivity which is

Do exorthermic reactions make surrounding hotter?

What's a certain indicator that a molecule is polar?