Which is the cause of mechanical weathering
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Answer:
The mechanical weathering is defined as the breaking down of rocks physically due to the agents such wind, water and ice. In addition this, plant roots, abrasion, rainfall and temperature also plays an important role in wearing away the rocks.
When water, wind flows over the rock surfaces, it erodes the rocks and this is known as the abrasion process. The broken particles (sediments) are transported by these agents and deposited at some other place.
The rocks also undergoes deformation due to the frost wedging process, freeze and thaw method, exfoliation and some other process.
These are the processes that are responsible for mechanical weathering.
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Planets in our solar system do not revolve around the sun in perfect circles. Their orbits are more like ovals that scientists describe as which of the following? A. revolutionary B. rotational C. periodical D. elliptical
Answers
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Chlorine has a charge of -1 and lead can have a charge of +2 or +4
The charges need to be balanced, so if lead was +4 then the equation would be PbCl4, because chlorine needs 4 atoms to balance out lead. Because it was Cl2, we know it was lead (II)
Answers
The correct statement is a single replacement reaction takes place because zinc is more reactive than hydrogen. Hence, option C is correct.
What is a chemical equation?
A chemical reaction is a representation of symbols of the elements to indicate the number of substances and moles of reactant and product.
A single replacement reaction takes place because zinc is more reactive than hydrogen.
Reaction
Zn+2HCl ⇒ ZnCl₂ + H₂
If we look at this reaction, the elements that play a role are those that undergo a redox reaction
Oxidation : Zn⇒Zn²⁺ + 2e
Reduction : 2H⁺ + 2e ⇒H₂
So Zn (located on the left) can push H (the element on the right) in the redox reaction ⇒ Zn is more reactive
A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds.
A+BC⇒AC+B
So the above reaction involves the elements Zn and H which undergo a redox reaction and are included in a single replacement.
Hence, option C is correct.
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Answer: The correct statement is a single replacement reaction takes place because zinc is more reactive than hydrogen.
Explanation:
A single displacement reaction is defined as the chemical reaction in which a more reactive metal displaces a less reactive metal from its chemical reaction. The reactivity of metals is determined from the series known as reactivity series.
The metals which lie above in the reactivity series are more reactive than the metals which lie below in the series. General equation for these reactions is given as:
where, A is more reactive metal than metal B.
Now, when zinc metal reacts with hydrochloric acid, it leads to the production of zinc chloride salt and hydrogen gas. The equation follows:
Here, zinc is more reactive metal than hydrogen because it lies above in the series.
Answers
Answer : The equilibrium constant expression will be,
Explanation :
The given balanced chemical reaction is,
The equilibrium expression for the reaction is determined by multiplying the concentrations of products and divided by the concentrations of the reactants and each concentration is raised to the power that is equal to the coefficient in the balanced reaction.
The concentrations of pure solids are constant that is they do not change. Thus, they are not included in the equilibrium expression.
So, the equilibrium constant expression will be,
Answer: D
Explanation:
Answers
Answers
Answer:
The number of protons of the Pb is 82.
The number of electrons of the Pb²⁺ is 80.
Explanation:
Each chemical element is characterized by the number of protons in its nucleus, which is called the atomic number Z.
The atomic number is used to classify the elements within the periodic table of the elements. In it, you can read in the upper left. In this case, the lead Pb has an atomic number of 82. This indicates that the number of protons of the Pb²⁺ is 82.
In every electrically neutral atom the number of protons in the nucleus is equal to the number of electrons in their orbitals. But in this case it is a cation, that is, it is a positively charged ion. A cation is formed when electrons are lost (which have a negative charge), thus acquiring the positive charge ion. In this case then, Pb²⁺ indicates that the cation has a +2 charge. So this means that 2 electrons have been lost. So, if it were electrically neutral, the lead Pb would have 82 electrons, but with the loss of two of its electrons, the number of electrons of the Pb²⁺ is 80.
There are 82 protons and 80 electrons in one Pb²⁺ ion. Lead (Pb) has an atomic number of 82.
The atomic number of an element represents the number of protons in its nucleus. Since lead (Pb) has an atomic number of 82, it means that a neutral lead atom has 82 protons.
When the Pb²⁺ ion is formed, it means that the atom has lost two electrons. The +2 charge indicates that the atom now has two more protons than electrons. Since electrons have a negative charge, losing two of them results in a net positive charge on the ion.
Since a neutral lead atom has 82 electrons, subtracting two electrons from it gives us 80 electrons in the Pb²⁺ ion. However, the number of protons remains the same at 82. The loss of electrons creates a positive charge, and the number of protons determines the element's identity.
In summary, the Pb²⁺ ion has 82 protons and 80 electrons. The 2+ charge indicates the loss of two electrons, resulting in a net positive charge on the ion.
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