Answer:
<h2>Boiling is a very simple method of water disinfection. Heating water to a high temperature, 100°C, kills most of the pathogenic organisms, particularly viruses and bacteria causing waterborne diseases. In order for boiling to be most effective, the water must boil for at least 20 minutes. </h2>
Explanation:
Answer: Stimulus
Explanation: The definition of Stimulus is "a thing or event that evokes a specific functional reaction in an organ or tissue," according to the Oxford Dictionary. So the book dropping and causing a noise is an example of a stimulus.
Answer:
There are two definitions for acid and base in chemistry.
Explanation:
There are different definitions of Acid and Base:
The <em>Arrhenius</em> definition sais that <u>acid</u> is every substance that increases the concentration of protons in water. Thus, a <u>base</u> is a substance that increase the concentration of oxydriles in water.
On the other hand, the <em>Bronsted</em> definition sais that an <u>acid</u> is a substance with the ability to give protons and a <u>base</u> is a substance with the ability to accept protons.