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3 years ago

Alexandria became the center for _____. its science

1 answer:

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Alexandria became the center for Hellenistic scholarship and culture. It was a great revolution in learning during this era as Alexandria had a library filled with books and important documents which were copied and even stolen. Over 500,000 titles were present in Alexandria's library.

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Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears. Samuel takes a sip to discover that the

Rzqust [24]

<span><u>_Award brainliest if helped! </u>
B It’s a physical change because the water and the salt kept their original properties.</span>

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3 years ago

Read 2 more answers

Which statement best describes the difference between a substance with a pH of 3.0 and a substance with a pH of 6.0?

satela [25.4K]

The statement best describes the difference between a substance with a pH of 3.0 and a substance with a pH of 6.0 is - The substance with the lower pH has 1,000 times as many hydrogen ions per volume of water.

pH is the scale or measure for the substance about its acidic or basic strength. It ranges from 0 to 6.9 which is acidic and 7.1 to 14 which is basic.

Acidic substance has high concentration of Hydrogen ions whereas, basic substance has low concentration of hydrogen ions, however for the OH⁻ ions it is reverse.

Concentration of hydrogen ions is inversely related to its pH
More hydrogen ions present, the lower the pH
The fewer hydrogen ions, the higher the pH We know,

pH = -log( $H^{+}$ ) then,

=> 3 = -log ( $H^{+}$ )

=> $H^{+}$ = (for pH = 3)

=> pH = -log( $H^{+}$ )

=> 6 = -log ( $H^{+}$ )

=> $H^{+}$ = $10^{-6}$ (for pH = 6)

Thus, The substance with the lower pH (3) has 1000 times as many hydrogen ions per volume of water.

Learn more about pH scale:

brainly.com/question/1596421

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3 years ago

Which of the following is an example of a renewable natural resource?

borishaifa [10]

Answer:

c. lumber

Explanation:

Lumber is considered a renewable natural resource because it is gotten from trees and trees are grow-able. A renewable natural resource is a resource which can be used repeatedly and replaced naturally. Examples of renewable natural resources are solar energy from the sun, water, oxygen, biomass, trees etc. Trees can be harvested and processed into lumber. The harvested trees can be planted again by humans or they can naturally reproduce through seedlings or fruits that drop and germinate on their own. This renewable germinating process of trees makes lumber a renewable natural resource.

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3 years ago

What is Aristotle famous for?

Mila [183]

Answer:

History

Explanation:

Im. Sorry. Im. Not. Much. Help

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3 years ago

What two simple machines are found in a bike?

omeli [17]

I think it's a pulley and a lever.

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3 years ago