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erastovalidia [21]
3 years ago
12

In part of which layer does heat flow by convection?

Chemistry
1 answer:
marshall27 [118]3 years ago
6 0

Answer:

the mantle because it's just built different

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An unknown compound contains 38.7 % calcium, 19.9 % phosphorus and 41.2 % oxygen. what is the empirical formula of this compound
Softa [21]

Answer: Ca3(PO4)2

Explanation:

  • We assume that the sample is 100.0 g.
  • The sample contains 38.7 g of Ca, 19.9 g of P, and 41.2 g of O as the proportions show.
  • Then we can calculate the number of moles of each component (n = m/atomic mass).
  • The number of moles of Ca = 38.7/40.078 = 0.96 mol.
  • The number of moles of P = 19.9/30.97 = 0.64 mol.
  • The number of moles of O = 41.2/15.99 = 2.75 mol.
  • Now, we can get the molar ratios of different components (Ca, P, and O) in the sample by dividing the number of moles of each component by the lower number of moles, that we should divide the number of moles by (0.64).
  • Ca: P: O = (0.96/0.64) : (0.64/0.64) : (2.75/0.64) = 1.5 : 1 : 4.
  • To avoid the fraction of the ratios, we can multiply all ratios by 2.0.
  • Now, the ratio of Ca : P : O will be 3 : 2 : 8.
  • That main the empirical formula of the compound is Ca3P2O8 which can be expressed as calcium phosphate (Ca3(PO4)2).
8 0
2 years ago
A horizontal row of elements in the periodic table represents a<br> group<br> period
castortr0y [4]

Answer:

Period

Explanation:

Periodic trend along period:

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction.

The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.The electron affinity also increases along period because of greater positive charge.

7 0
2 years ago
0. 01 M HCl solution has a pH of 2. Suppose that during the experiment, both the universal pH indicator and the cabbage indicato
8090 [49]

Answer:

a.) It matches the universal pH indicator and is indicating the proper pH.

Explanation:

it says its the answer.

5 0
2 years ago
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What mass of oxygen must react in order for 4.25 grams of CO2 to be produced? HELP
FromTheMoon [43]
When methane gas, CH4, burns completely in oxygen, the reaction produces carbon dioxide and water, as seen in the equation. CH4+2 O2 CO2 + 2 H20.
5 0
3 years ago
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Each of the following compounds contains a metal that can exhibit more than one ionic charge. Provide systematic names for each
jeyben [28]

the awnser is E hope this helps u

5 0
2 years ago
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