What does it mean for a substance to have high reactivity? a.) it reacts easily with other substances. b.) it reacts only at high temps. c.) it reacts easily with few substances. d.) it reacts only with air

Option (a) is the correct answer.

Explanation:

When we say that a substance has high reactivity then it means the substance is able to react readily with another substance.

For example, atomic number of potassium is 19 and its electronic distribution is 2, 8, 8, 1.

Since, it has only one valence electron and to attain stability it just needs 8 electrons in its valence shell. So, it will readily lose its 1 valence electron and thus become very much reactive in nature.

Thus, we can conclude that for a substance to have high reactivity it means that it reacts easily with other substances.

the tides are influenced by both the moon and the sun, it's easy to see that when the sun lines up with the moon and the earth, as during a new moon or full moon, the tidal effect is increased. these are known as spring tides, named not for the season, but for the fact that the water "springs" higher than normal. on the other hand, if the sun and the moon are 90 degrees apart in relation to an observer on earth as during the first quarter moon or third quarter moon, then high tides are not as high as they normally would be. this is because despite its greater distance, the sun's mass allows it to exert enough gravitational force on the oceans that it can negate some of the effects of the moon's pull. this phenomenon of lower high tides is called a neap tide. if you need more information on this topic visit moonconnection.com.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.