Which quantity identifies an element?

1. Atomic number

2. Mass Number

3. total number of neutrons in an atom of the element

4. total number of valence electrons in an atom of the element

The enthalpy of formation of water is - 285.8 kJ/mol. What can be inferred from this statement? A. The enthalpy of the products is equal to the enthalpy of the reactants. B. Heat is absorbed during the process. C. Heat is released during the process.

The arrangement of electrons in the orbitals of an atom

If a student did not remove all of the bubbles from inside the buret before reading the initial volume and beginning the titration, will this cause the calculated concentration of the hydrochloric acid determined from that trial to be higher or

How many atoms of each element are in one molecule of this product.

A mammoth skeleton has a carbon-14 content of 12.50 of that found in living organisms True/False

How far is the Earth for the moon?

It is thought that organelles of eukaryotic organisms, such as mitochondria and chloroplasts (in plant cells) came from

How does temperature affect molecules

The color of Benedictâs solution is blue. What color does it change to in high sugar concentration?

What functional groups of the emulsifying agent provide the hydrophilic character? Do these groups affect the pH?