What is the total number of neutrons in the nucleus of a neutral atom that has 19 electrons and a mass of 39?

a. 19

b. 20

c. 39

d. 58

At this temperature, 0.400 mol of h2 and 0.400 mol of i2 were placed in a 1.00-l container to react. what concentration of hi is present at equilibrium?

1. Simplify. | A. O 16 B. O C. 04 D. O

A chemist wants to extract copper metal from copper chloride solution. The chemist places 1.50 grams of aluminum foil in a solution of 14 grams of copper (ll) chloride. A single replacement reaction takes place.

How many atoms does theobromine have

Which structure is found in a single-celled organism? A. internal organs B. legs C. outer covering D. large brain

Which of the following has the greatest mass, in grams? a. 1 atom of lead (Pb) b. 0.5 mol copper (Cu) atoms c. 0.3 mol gold (Au) atoms d. 25 atoms of mercury (Hg)

Which one is not a sedimentery rock a.) sandstone b.) limestone c.) quartz d. (coal

Which group is more reactive than the alkaline earth metals?

Why do you not want any of the water on the outside of the test tube to drip off into the calorimeter?

What is the mass of an original 5.60-gram sample of iron-53 that remains unchanged after 25.53 minutes?