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bija089 [108]
3 years ago
8

When water or melted ice soaks into the cracks of rocks and freezes, thus causing stress in the rocks due to expansion, causing

the rock to break. This is called what
Chemistry
1 answer:
nasty-shy [4]3 years ago
8 0

Answer:

When water or melted ice soaks into the cracks of rocks and freezes, thus causing stress in the rocks due to expansion, causing the rock to break. This is called <u>Freeze-Thaw.</u>

Explanation:

  • Mechanical weathering is the process of breaking big rocks into little one by the means of Temperature , roots of plants , water .
  • <em>Little animals also help by burrowing and digging through the ground. Temperature also affects the land . The cool nights and hot days always cause things to expand and contract. That movement can cause things to break apart . Roots and plants also push into the rocks to crack and break apart.</em>

<em />

  • Scientist have observed a process called freeze-thaw.
  • <em>That process occurs when the water inside of rocks freezes and expands . That expansion cracks the rocks from the inside and eventually breaks them apart . </em>
  • The freeze-Thaw cycle happens over and over again and the break finally happens. Another word for it is frost wedging. There are already some cracks in boulders and water can get inside these.
  • When that water expands, the rock is crunched between two expanding pieces of ice instead of being forced apart into separate pieces.

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Which of the following statements about the combustion of glucose with oxygen to form water and carbon dioxide (C6H12O6 + 6 O2 →
worty [1.4K]

Answer:

The correct statement is:

E - The entropy of the products is greater than the entropy of the reactants.

Explanation:

C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O

As glucose is a large molecule and then it is transformed into many molecules of water and carbon dioxide, the entropy of the system increases. If the number of molecules increases, the disorder increases.

Initial state: 7 molecules (1 glucose + 6 oxygen)

Final state: 12 molecules (6 carbon dioxide + 6 water)

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3 years ago
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Which can lead scientists to change a theory that has already been accepted? Check all that apply. changes to scientific laws ne
Romashka-Z-Leto [24]

Answer:

New experimental methods

Technological inventions

Explanation:

A scientific theory is usually not based on speculation. Scientific theories must have a solid empirical basis.

However, experimental methods are limited to the caliber of equipments available at the time in which a theory is formulated. With advancing years, more technological sophistication leads to the invention of new instruments and ultimately, the development of new experimental methods.

These innovations are likely to alter existing scientific theories as new evidences emerge, hence the answer.

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Which of the following reactions could be an elementary reaction? 2 NO2(g) + F2(g) → 2NO2F(g) Rate = k[NO2][F2] H2(g) + Br2(g) →
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<u>Answer:</u> The correct answer is NO(g)+O_2(g)\rightarrow NO_2(g)+O(g);Rate=k[NO][O_2]

<u>Explanation:</u>

Molecularity of the reaction is defined as the number of atoms, ions or molecules that must colloid with one another simultaneously so as to result into a chemical reaction.

Order of the reaction is defined as the sum of the concentration of terms on which the rate of the reaction actually depends. It is the sum of the exponents of the molar concentration in the rate law expression.

Elementary reactions are defined as the reactions for which the order of the reaction is same as its molecularity and order with respect to each reactant is equal to its stoichiometric coefficient as represented in the balanced chemical reaction.

For the given reactions:

  • <u>Equation 1:</u> 2NO_2(g)+F_2(g)\rightarrow 2NO_2F(g);Rate=k[NO_2][F_2]

Molecularity of the reaction = 2 + 1 = 3

Order of the reaction = 1 + 1 = 2

This is not considered as an elementary reaction.

  • <u>Equation 2:</u>  H_2(g)+Br_2(g)\rightarrow 2HBr(g);Rate=k[H_2][Br_2]^{1/2}

Molecularity of the reaction = 1 + 1 = 2

Order of the reaction = 1+\frac{1}{2}=\frac{3}{2}

This is not considered as an elementary reaction.

  • <u>Equation 3:</u>  NO(g)+O_2(g)\rightarrow NO_2(g)+O(g);Rate=k[NO][O_2]

Molecularity of the reaction = 1 + 1 = 2

Order of the reaction = 1 + 1 = 2

This is considered as an elementary reaction.

  • <u>Equation 4:</u>  NO_2(g)+CO(g)\rightarrow NO(g)+CO_2(g);Rate=k[NO_2]^2

Molecularity of the reaction = 1 + 1 = 2

Order of the reaction = 2 + 0 = 2

In this equation, the order with respect to each reactant is not equal to its stoichiometric coefficient which is represented in the balanced chemical reaction. Hence, this is not considered as an elementary reaction.

Hence, the correct answer is NO(g)+O_2(g)\rightarrow NO_2(g)+O(g);Rate=k[NO][O_2]

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Answer:

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