An atom with an atomic number of 12 and a mass number of 25 can best be described by which of these

The average atomic mass recorded on the periodic table for krypton is 83.80 u. This indicates that the most abundant isotope of krypton is

Co (s) is placed into a solution containing Au + (aq). A redox reaction occurs, the products of which are Co3 + (aq) and Au (s), what is the balanced redox equation?

Using the equation N2+3H2-->2NH3 how many grams of NH3 is made if 11 grams of N2 are used?

What two-elements make up a water molecule?

Which is most likely to be part of an ionic bond? A. an atom with no valence electrons B. an atom with one valence electron C. an atom with two valence electrons D. an atom with three valence electrons

In which group do all atoms have seven valence electrons in the ground state?

What happens to a substance during a physical change?

4. Between a measuring sylinder and a pipette, which one would you use to measure volume of a solution to give smaller uncertainty range?

List two potential problems with burning garbage.

Mole ratios how can the coefficients in a chemical equation be interpreted. True or False