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3 years ago

Which of these statements best explains why the soil around a volcanic region is fertile?

Chemistry

2 answers:

Troyanec [42]3 years ago

8 0

Answer: b. Volcanoes aid in the formation of new rocks, which help form new soils.

Explanation:

Volcanic eruption is a natural phenomena which involves the expulsion of hot magma and gases from the earth geosphere with drastic explosion due to generation of heat and pressure by the hot mantle. The hot magma get solidify on the surface of earth crust and becomes rocks. These rocks contains many inorganic minerals. If these rocks wither into soil can support the growth of plants because of the presence of the minerals.

Temka [501]3 years ago

4 0

Answer:

C. Particles released in the air by volcanoes fall to the ground and enrich the soil.

Explanation:

Got it right on the quiz

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Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g)2Al(s)+3H2SO4(

ryzh [129]

Answer:

83.9g of sulfuric acid is the minimum mass you would need

1.73g of hydrogen would be produced

Explanation:

Based on the reaction:

2 Al(s) + 3 H₂SO₄(aq) → Al₂(SO₄)₃(aq) + 3 H₂(g)

2 moles of solid aluminium react with 3 moles of sulfuric acid. Also, two moles of Al produce 3 moles of hydrogen gas.

15.4g of Al are:

15.4g Al × (1mol / 26.98g) = 0.571 moles of Al.

Moles of sulfuric acid:

0.571 moles Al × (3 mol H₂SO₄ / 2 mol Al) = 0.8565 moles H₂SO₄

In grams:

0.8565 moles H₂SO₄ × (98g / 1mol) = <em>83.9g of sulfuric acid is the minimum mass you would need</em>

In the same way, moles of hydrogen produced are:

0.571 moles Al × (3 mol H₂ / 2 mol Al) = 0.8565 moles H₂

In grams:

0.8565 moles H₂ × (2.015g / 1mol) = <em>1.73g of hydrogen would be produced</em>

3 0

3 years ago

For the chemical reaction, 2HCl + Ca(OH)2 ➡️ CaCl2 + 2H2O what mass of calcium hydroxide in grams is needed to produce 3.63 mol

wlad13 [49]

Answer:

2HCl (aq) + Ca

(

)

(aq) ---------> Ca

(ppt) + 2

O (aq)

let us calculate the number of moles , as per the chemical reactions;

2 moles of HCl solution reacts with one mole Calcium Hydroxide

(

)

One mole of HCl has mass : 36.5 g/mol, two moles of HCl will have mass, 73 g.

One mole of Ca

(

)

has mass 74.1 g

as per equation; 73 g of HCl reacts with 74.1 g of Ca

(

)

1g of HCl reacts with 74.1g / 73 of Ca

(

)

1g of HCl reacts with 1.015 g of Ca

(

)

NOW AS PER THE QUESTION MOLARITY AND VOLUME OF HYDROCHLORIC ACID IS GIVEN, IT CAN BE USED TO CALCULATE THE MASS OF HYDROCHLORIC ACID IN THE SOLUTION.

NUMBER OF MOLES of HCl ; Molarity of solution x Volume of Solution

# of moles of HCl = (0.40 mol/L ) x 350 mL

= (0.40 mol/L ) x 0.350 L = 0.14 mol

mass of HCl that makes 0.14 mol of HCl = # of moles x molar mass of HCl

mass of HCl = 0.14 mol x 36.5 g/ mol

mass of HCl = 5.11g

As per Stoichiometry , 1g of HCl reacts with 1.015 g of Ca

(

)

, 5.11g of HCl can react with 5.11 x 1.015 = 5.1865 g or 5.2 g of

(

)

5 0

2 years ago

Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. The o

ad-work [718]

Answer:

The molar concentration would have to be 0,81 M.

Explanation:

The osmotic pressure equation is:

$\pi = M R T$

where:

$\pi$ : osmotic pressure [atm]

M: molar concentration [M]

R: gas constant 0,08205 [atm.L/mol.°K]

T: absolute temperature [°K]

To solve the problem, we just clear M from the osmotic pressure equation and then replace our data using the appropiate units. Clearing the variable M we have:

$M = \frac{\pi }{RT}$