Name a substance in the air which makes the surface of limestone change

Answers

Answer 1

Answer:

The substance in the air that makes the surface of limestone change is sulfur dioxide (SO2).

What are limestone?

Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO3) in the form of the mineral calcite. It can form in a variety of ways, but most commonly it is formed from the accumulation of the remains of marine organisms such as coral, shells, and other calcium-rich materials.

Limestone is a common building material and is used in construction, as a flux in the production of iron and steel, and in agriculture as a soil conditioner. It is also used in the chemical industry to produce lime, carbon dioxide, and other chemicals. Limestone can be found in many parts of the world and is usually formed in shallow, warm marine environments.

Learn more about limestone, here:

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Answer 2

Answer: A substance in the air which can change the surface of limestone would be oxygen, O2.

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Under conditions when glucose oxidation is elevated, the acetyl-CoA produced will allosterically activate which of the following enzymes leading to an increase in the production of oxaloacetate?a. Pyruvate carboxylase b. Citrate lyase c. Acetyl-CoA carboxylase d. Malate dehydrogenase
Which one of the following equations is not balanced?6H2O + 6CO2 ---> C6H12O6 + 6O2C7H16 + 11O2 ---> 7CO2 + 8H2OPCl2 + 4H2O --->H3PO4 + 5HCLFe3O4 + 4H2 ---> 3Fe + 4H2O
Which statement is true about shape?A. All substances have a set shapeB. Liquids take the shape of their containerC. You cannot change the shape of a substanceD. Shape is a characteristic property
A container is filled with 4.0 g H2 and 5.0 02. How much water is produced

How many dots are shown in the electron dot diagram for calcium, element number 20?

Answers

2 dots are shown for drawing it. because it has two valence electrons

For each molecule, what should be determined? A) Number of pi bonds and if they are delocalized. B) Number of sigma bonds and if they are localized. C) Number of hydrogen bonds and if they are polarized. D) Number of covalent bonds and if they are ionic.

Answers

Answer:

Explanation:

A) Number of pi bonds and if they are delocalized:

Determine the number of pi (π) bonds in the molecule. Pi bonds are formed by the overlap of p-orbitals in a double or triple bond.

Assess whether these pi bonds are delocalized. Delocalization occurs when electrons in pi bonds are not localized between just two atoms but are spread out over multiple atoms or regions within the molecule. This typically involves resonance structures in organic chemistry.

B) Number of sigma bonds and if they are localized:

Determine the number of sigma (σ) bonds in the molecule. Sigma bonds are formed by the head-on overlap of atomic orbitals in single bonds.

Assess whether these sigma bonds are localized. In most cases, sigma bonds are localized between two specific atoms, meaning they involve a direct bond between those atoms.

C) Number of hydrogen bonds and if they are polarized:

Determine the number of hydrogen bonds in the molecule. Hydrogen bonds are a special type of dipole-dipole interaction involving hydrogen atoms bonded to highly electronegative atoms (such as oxygen, nitrogen, or fluorine) and other electronegative atoms.

Assess whether these hydrogen bonds are polarized. Hydrogen bonds involve a difference in electronegativity between the hydrogen atom and the electronegative atom, creating a polar bond. The extent of polarization can vary depending on the specific atoms involved.

D) Number of covalent bonds and if they are ionic:

Determine the number of covalent bonds in the molecule. Covalent bonds involve the sharing of electrons between atoms.

Assess whether these covalent bonds are ionic. Covalent bonds are typically characterized by the sharing of electrons, while ionic bonds involve the complete transfer of electrons from one atom to another, resulting in ions. Covalent bonds are typically nonpolar or polar, while ionic bonds are highly polar.

An element X belongs to 4th period and 17th group. Write the formula of the compound formed when it reacts with Y( atomic no.-13, mass no.27.)

Answers

all element in group 17th have their oxidation number to be -1 and for the other element its shell configuration should be 2,8,3...therefore its oxidation number should be +3
therefore the formular should be YX3

In general, the solubility of ________ in water decreases as temperature increases.

Answers

Solubility of a gas in a liquid is directly proportional to the partial pressure of the gas present above the liquid and is inversely proportional to the temperature.

So, the solubility of gas in water decreases as the temperature increases.

Answer:

solubility increases

Explanation:

Which equation is a decomposition reaction?a. Li2CO3 ---> Li2O + CO2

b. Zn + HCl ---> ZnCl2 + H2

c. Na2O + CO2 ---> Na2CO3

d. C6H12O6 + O2 ---> CO2 + H2O

please help asap

Answers

Answer : (a) $Li_2CO_3\rightarrow Li_2O+CO_2$ is a decomposition reaction.

Explanation :

(a) $Li_2CO_3\rightarrow Li_2O+CO_2$ is a decomposition reaction.

Decomposition reaction : It is a type of chemical reaction in which a single compound decomposes into two or more compounds.

(b) $Zn+2HCl\rightarrow ZnCl_2+H_2$ is a displacement reaction.

Displacement reaction : It is a type of reaction in which a most reactive element displaces the least reactive element in a compound.

(c) $Na_2O+CO_2\rightarrow Na_2CO_3$ is a combination reaction.

Combination reaction : It is a type of reaction where two or more compounds combine to form a single compound.

(d) $C_6H_(12)O_6+6O_2\rightarrow 6CO_2+6H_2O$ is a combustion reaction.

Combustion reaction : It is a type of reaction where a hydrocarbon react with the oxygen to produced carbon dioxide and water.

Therefore, option (a) is a decomposition reaction.

The reaction in which reactant breaks down into more than one constituents is called decomposition reaction. So option A. Li2CO3 ---> Li2O + CO2 is correct.

The respiratory system takes oxygen into the human body and expels carbon dioxide. Which body system interacts with the respiratory system to transport these gases to and from the various parts of the body?A. the nervous system
B. the digestive system
C. the urinary system
D. the circulatory system

Answers

The answer is D, the circulatory system.

Answer:

The answer is D, the circulatory system.

Explanation:

I got a a on the test

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