Choose the three items that are characteristic of a strong base.

many OH- ions

few H+ ions

large Kb and small Ka

Explanation:

A strong base has a large concentration of OH-. A typical example of this is NaOH.

Also a strong base usually has a very low concentration of H^+ ions and a very high concentration of OH^- ions.

Lastly, it must have a very high base dissociation constant. Its Kb, the base dissociation constant is a measure of how completely a base dissociates into its component ions in water. The higher the Kb, the stronger the base. A strong base dissociates completely in solution.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.