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3 years ago

Explain why glacial deposits have been found in Africa?

2 answers:

5 0

Glacial deposits of various ages have been found in Africa and in most other continents. This is because the continents move around the surface of the earth due to plate tectonics, and at some times the continent was situated close to one or other of the poles. Bear in mind, however, that at the time these deposits were made Africa was part of the larger supercontinent of Gondwana - glacial deposits of the same age are found in S. America and in India. There was an earlier glacial event as well, and traces of the so-called snowball earth event in the late Precambrian are found in Namibia. However, there are no glacial deposits in Africa that relate to the current ice-age.

aliya0001 [1]3 years ago

3 0

Glaciers were found in Africa because continents were connected and party covered with snow near the south pole long ago.

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Please help!!!

Strike441 [17]

Answer:

The above reaction is an example of <u>alcoholic fermentation</u>.

Explanation:

In alcoholic fermentation, one mole of glucose gets converted into two moles of alcohol, two moles of carbon dioxide and two moles of adenosine tri-phosphate (ATP).

5 0

3 years ago

Match the mountain range with its formation.

zimovet [89]

Yea it turns to a 35

8 0

3 years ago

G the normal range of the ph of blood is between 7.35 and 7.45; variations beyond this range have significant health implication

Fiesta28 [93]

Answer : the hydrogen ion concentrations for pH = 7.35 and pH = 7.45 are 4.46 x 10⁻⁸ M and 3.54 x 10⁻⁸ M respectively.

When the pH of a solution is less than 7, the hydrogen ion concentration is higher and therefore the solution is acidic.

On the other hand, when the pH of a solution is greater than 7, hydroxide ion concentration is higher and the solution acts as a base.

The normal pH range of blood is given as 7.35 - 7.45 which is greater than 7. That means blood is slight basic in nature.

Let us find hydroxide ion concentration of blood.

$pH + pOH = 14$

$7.35 + pOH = 14$

$pOH = 6.65$

$pOH = - log [OH-]$

$[OH-] = 10^{-6.65}$

$[OH-] = 2.24 \times 10^{-7}$

Ionic product of water is written as,

$[H+] [OH-] = 1 \times 10^{-14}$

Let us plug in the calculated value of [OH-]

$[H+] = \frac{1 \times 10^{-14}}{2.24 \times 10^-7} = 4.46 \times 10^{-8} M$

The hydrogen ion concentration for pH = 7.35 is 4.46 x 10⁻⁸ M

Calculation of [H+] for pH = 7.45

pOH = 6.55

[OH-] = 2.82 x 10⁻⁷

$[H+] = \frac{1 \times 10^{-14}}{2.82 \times 10^-7} = 3.54 \times 10^{-8} M$

Similarly, for pH = 7.45, we get hydrogen ion concentration of 3.54 x 10⁻⁸ M.

8 0

4 years ago

How much water, in grams, can be made from

Aleks [24]

Answer:

$m_{H_2O}=73.0gH_2O$

Explanation:

Hello there!

In this case, since the formation of water from hydrogen and oxygen is:

$2H_2+O_2\rightarrow 2H_2O$

Whereas we find a 2:2 mole ratio of hydrogen to water. In such a way, by using the Avogadro's number, the aforementioned mole ratio and the molar mass of water (18.02 g/mol), we obtain the following grams of water product:

$m_{H_2O}=2.44x10^{24}molec*\frac{1molH_2}{6.022x10^{23}molec}*\frac{2molH_2O}{2molH_2}*\frac{18.02gH_2O}{1molH_2O}\\\\ m_{H_2O}=73.0gH_2O$

Regards!

6 0

3 years ago

How would you choose an indicator for titrating a strong acid with a strong base?

Paha777 [63]

A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10.

6 0

3 years ago