What two quantities must be known to calculate the density of a sample of matter?

a. mass and volume

b. length and mass

c. size and weight

d. weight and volume

How many electrons are in O2-?

Which set of coefficients correctly balances the following chemical equation?__ AgNO3 + ___ MgCl2 - - > ___ AgCl + ___ Mg (NO3) 2 4, 2, 4, 2 1, 2, 1, 2 2, 1, 2, 1 1, 1, 1, 1

Compare the first ionization energy of sodium to that of potassium

The bond energy for the van der waals bond between two helium atoms is 7.9*10-4ev. assuming that the average kinetic energy of a helium atom is (3/2) kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium

How many bonds can each of the elements below form with neighboring atoms in a compound? CHON BOSCH

Explain the difference between the greenhouse effect and global warming.

Ionic bonds are formed between metals and non-metals to form salts. a. True b. False

In a closed or isolated system, matter can not be created or destroyed. It can change Forms but is conserved true or false

Explain in terms of element classification, why K2O is an ionic compound

Which statement defines reduction potential when considering a pair of half-cell reactions?