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2 years ago

10. Composite volcanoes

Chemistry

2 answers:

BartSMP [9]2 years ago

6 0

Answer:

Composite volcanoes. ... They are typically steep-sided, symmetrical cones of large dimension built of alternating layers of lava flows, volcanic ash, cinders, blocks, and bombs and may rise as much as 8,000 feet above their bases.Muh. 28, 1432 AH

lys-0071 [83]2 years ago

5 0

The answer is probably A

Explanation:
It cannot be B as it has broader base, cannot be C as it gets steeper as you approach the top and they are very common. (Also, it is called stratovolcano which has layers)

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Which best describes how a fetus exchanges gases while in the womb?

vagabundo [1.1K]

Answer:

C. Gas exchange occurs through the placenta.

Explanation:

The fetus is a developing baby in the womb or uterus. The fetus is incapable of performing certain life processes itself and hence, depends on the mother to do them. One of these processes is GAS EXCHANGE. Gas exchange occurs in the fetus via a structure called PLACENTA.

Placenta is a structure that forms in the uterus during pregnancy. It helps the developing fetus supply oxygen and nutrients from the mother and also remove wastes from the fetus back to the mother. The oxygen is taken into the fetus via the PLACENTA while the carbon dioxide (waste product of respiration) is removed via the PLACENTA. Hence, Gas exchange occurs through the placenta.

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3 years ago

The buffer solution is used to control the pH to insure that it does not become too high because excessively basic solutions cou

oksian1 [2.3K]

Answer:

pH = 12.7

Explanation:

First, we have to calculate the [Ca²⁺] in a solution of about 250 ppm CaCO₃.

$\frac{250mgCaCO_{3}}{L} .\frac{1gCaCO_{3}}{1000mgCaCO_{3}} .\frac{1molCa^{2+} }{100gCaCO_{3}} =2.5 \times 10^{-3} M$

Now, let's consider the dissolution of Ca(OH)₂ in water.

Ca(OH)₂(s) ⇄ Ca²⁺(aq) + 2 OH⁻(aq)

The solubility product Ksp is:

Ksp = [Ca²⁺] × [OH⁻]²

[OH⁻] = √(Ksp/[Ca²⁺]) = √(6.5 × 10⁻⁶/2.5 × 10⁻³) = 5.1 × 10⁻² M

Finally, we can calculate pOH and pH.

pOH = -log [OH⁻] = -log (5.1 × 10⁻²) = 1.3

pH + pOH = 14 ⇒ pH = 14 - pOH = 14 - 1.3 = 12.7

5 0

3 years ago

What are things that cause change

inessss [21]

Explanation:

A catalyst means "something that causes activity,an event, or change." And usually,these events and changes are big.

I hope it's helpful!

5 0

3 years ago

Read 2 more answers

How many Si atoms are there in 1.00 g of silicon

gregori [183]

Number of atoms in 1 g of silicon are 6.022 * 10^23

5 0

2 years ago

The free energy of an electrochemical cell is given by the equation:

Nuetrik [128]

To obtain the number of moles of electrons, we need to multiply both sides by 1/FE.

<h3>What is electrochemical cell?</h3>

The electrochemical cell is a cell in which energy is produced by chemical reactions which are spontaneous. We can obtain the free energy of an electrochemical cell using the equation; ΔG=-nFE

To make n the subject of the formula, we need to multiply both sides by 1/FE as follows;

$\frac{dG}{FE} = n$ .

Learn more about electrochemical cell: brainly.com/question/4592165

7 0

3 years ago