The most active of all the chemical elements is a halogen known as

A. astatine.

B. bromine.

C. fluorine.

D. iodine

What is the most common type of ocean pollutions

Which best describes a stock solution that is used in a dilution? a concentrated solution a solution present in the largest quantity a dilute solution a solution present in the smallest quantity

What conditions favor the formation of ionic compounds from elements? both atoms must be non metals. you must have a metal and a nonmetal. both atoms must be metals. you must have a metal atom and a halogen?

In an addition reaction, which bond of the reactant is broken?

The body's pH is tightly regulated because specific enzymes function best within a narrow pH range. What is the approximate pH of a 1.2 * 10-5 M aqueous solution of NaOH?

If 3.011 x 1023 molecules have a mass of 20.04 grams, what is the molar mass of this substance?

What is the precipitation reaction of sodium nitrate and lead (II) ?

The factor that affects how easily an electron can be removed from an atom is the A. surrounding atoms. B. temperature of the environment. C. size of the atom. D. structure of the atom.

NaCl in roman numerals

A compound has an empirical formula of C2H6. What additional piece of evidence is needed to determine the molecular formula? a. percent composition of carbon b. mass of the sample c. relative numbers of atoms of each element d.