element x is a neutral element and has 39 protons. what element is it and how many electrons does it have? (use the periodic table)

328. mL of 0.00345 M NaI (aq) is combined with 703. mL of 0.00802 M Pb (NO3) 2 (aq). Determine if a precipitate will form given that the Ksp of Pbl2 is 1.40x10-8.

Calculate the mole fraction of benzene in a mixture that contains 45.2 g of benzene and 115.8 g of toluene.

Elements with great electron affinities (large negative values) often have 1. large sizes and low ionization energies. 2. small sizes and low ionization energies. 3. small sizes and high ionization energies. 4.

The atomic mass of 14N is 14.003 amu. The atomic mass of 15N is 15.000 amu. What is the average atomic mass of nitrogen?

What are ions? a. atoms with equal numbers of protons and electrons b. electrically charged atoms c. neutral atoms d. small molecules with covalent bonds

What is the mass in grams of 85.32 mL of blood plasma with a density of 1.03 g/mL?

The molar solubility of Ag2CO3 is 0.074M at 10°C. What is the Ksp of Ag2CO3 at the same degree?

You would know you were in the troposphere If? It were raining on you You were floating in space You were flying in a high altitude jet You were in the ozone later

A burning match is an example of a chemical change phase change nuclear change physical change

The table below shows the shapes of two samples, C and D, when placed in three containers of different shapes.