What happens to limestone’s density after it is metamorphosed into marble?

Answer:

the nucleus of an atom is positivley charged

Explanation:

Answer:

sorry but can't understand your question properly

Answer: B: a solvent

Explanation: I hope this helps!

Given chemical equation is:

n2 + 3h2 → 2nh3.

To calculate the number of grams of hydrogen needed to completely react with 28.0 grams of nitrogen, we need to follow the following steps: -

Calculate the molar mass of N2.

Use the stoichiometry of the balanced chemical equation to find the moles of H2 required to react with 28.0 g of N2.

Calculate the grams of H2 required to produce the calculated number of moles of H2.

Let's solve the problem one by one.

Molar mass of N2:

Molar mass of N2 = 2 × atomic mass of N = 2 × 14.01 g/mol = 28.02 g/mol

No. of moles of N2:

No. of moles of N2 = 28.0 g ÷ 28.02 g/mol = 0.9997 mol

From the chemical equation, the mole ratio of N2 to H2 is 1:3.

Thus, 0.9997 moles of N2 would react with = 3 × 0.9997 mol H2 = 2.9991 mol H2

Amount of H2:

Amount of H2 = number of moles of H2 × molar mass of H2 = 2.9991 mol × 2.016 g/mol = 6.0506 g H2

Therefore, 6.0506 grams of hydrogen are needed to completely react with 28.0 grams of nitrogen.

To completely react with 28.0 grams of nitrogen, 6.0506 grams of hydrogen are needed.

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The unbalanced equation is one in which the moles of atoms are not equal on both sides of the reaction.

A balanced chemical equation is one in wgich the moles of atoms in the reactants side is equal to the moles of atoms on the product side.

The given equations of reaction is not clearly stated.

Therefore, the unbalanced equation is one in which the moles of atoms are not equal on both sides of the reaction.

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     The molecular dipole of the ozone molecule can be attributed to the geometry of the molecule, especially the lone pair electrons on the central atom.

          A molecule, as a charge distribution, may have a permanent electric dipole, a vector known as the molecular dipole. The size of this dipole, known as the molecular dipole moment, indicates the polarity of the molecule; in other words, the dipole moment measures the amount of charge separation in a molecule.

         Polarity is typically explained in chemistry by the presence of electronegative and/or electropositive atoms in the molecule. Electrons are drawn to electronegative atoms, while electrons are donated to electropositive atoms. These are semi-quantitative concepts, and different scales for electronegativity and electropositivity of chemical elements are used, resulting in varying values of molecular dipole moments.

       However, all scales predict the same dipole direction. The direction of the dipole vector is from negative to positive charge for physicists and from positive to negative charge for many chemists. In the physics convention, the figure depicts the dipole moment of water.

           Molecular dipole moments can be measured experimentally using microwave spectroscopy and dielectric constant measurements as a function of temperature. Quantum chemical methods can compute dipole moments reliably for smaller molecules.

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The parts of DNA that carry the robustness of DNA genetic code are the nitrogenous bases, which are divided into two categories: pyrimidines and purines.

Pyrimidines include thymine (T) and cytosine (C), while purines include adenine (A) and guanine (G). These nitrogenous bases pair up with complementary bases to form the rungs of the DNA ladder, and the sequence of these base pairs determines the genetic code. The nitrogenous bases are attached to a sugar molecule, which is known as the carbohydrate, and a phosphate group. Together, these three components make up a nucleotide, which is the building block of DNA.
Hence, The robustness of the DNA genetic code is primarily carried by purines and pyrimidines. Purines include adenine and guanine, while pyrimidines consist of cytosine, thymine, and uracil. These nitrogenous bases form the genetic code by pairing through hydrogen bonds, providing the foundation for DNA's stability and genetic information transmission.

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In the given chemical equation, oxidation takes place at anode  of the electrochemical cell .

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

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Answer: C

Here is how I used Process of Elimination:

An hypothesis is your guess before you conduct the experiment.

An inquiry is when you ask for information.

A law is a statement based on repeated experiments.

The answer had to be conclusion.

Hope it helps!

To ensure greater accuracy in an experiment employing a calorimeter, it is crucial to maintain a constant amount of water within the calorimeter and keep the height of the calorimeter consistent above the flame. This practice minimizes heat transfer to the surrounding environment, leading to more precise and reliable outcomes.

The amount of water in the calorimeter and the height of the calorimeter above the flame are critical for accurate results because they influence the experiment's heat transfer to the surrounding environment.

This article explains why it is essential to keep the amount of water in the calorimeter and the height of the calorimeter above the flame consistent throughout the experiment.

A calorimeter is a device utilized for quantifying the heat associated with chemical reactions or physical alterations. During the experiment, heat transfer to the environment takes place, which affects the accuracy of the results. A calorimeter must be designed to reduce the amount of heat that is transferred to the environment, resulting in more accurate outcomes.

The container's shape and material are significant contributors to reducing heat loss, and the surrounding environment must be kept consistent. Any variations in the surroundings would result in significant differences in the amount of heat transferred to the environment.

Therefore, to obtain precise results, it is essential to maintain a constant amount of water in the calorimeter and keep the height of the calorimeter consistent above the flame throughout the experiment. Consider that the calorimeter has less water than usual, the heat transfer rate to the environment increases, resulting in inaccurate results.

Similarly, if the calorimeter is placed too close to the flame, the amount of heat transferred to the environment will be high, affecting the accuracy of the outcomes. To ensure accurate results, it is imperative to maintain a constant amount of water in the calorimeter and keep the height of the calorimeter consistent above the flame. By doing so, the risk of obtaining inaccurate outcomes is minimized.

In conclusion, the consistency of water amount and calorimeter height is crucial for reliable experimental measurements. This will help to reduce heat transfer to the surrounding environment, thus providing more accurate results.

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solids are similar to liquids in that both are condensed states, with particles that are far closer together than those of a gas. However, while liquids are fluid, solids are not. The particles of most solids are packed tightly together in an orderly arrangement. The motion of individual atoms, ions, or molecules in a solid is restricted to vibrational motion about a fixed point. Solids are almost completely incompressible and are the densest of the three states of matter.

Based on the given information, the given structures are isomers, i.e., option B as they have different arrangements, but the same molecular formula.

Isomers are organic compounds having the same molecular formula and different molecular structures.

This difference is due to varying spatial arrangement of atoms in the compounds.

Isomers of different compounds have different properties based on the molecular formula.

Thus, the correct option is B.

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Answer:

The three nutrients needed for growth, repair, and other life processes are:

Proteins: Proteins are important for building and repairing tissues in the body, as well as for producing enzymes and hormones. Good food sources of protein include chicken, fish, eggs, beans, lentils, nuts, and seeds.

Carbohydrates: Carbohydrates are the primary source of energy for the body. Good food sources of carbohydrates include whole grains, fruits, vegetables, and legumes.

Fats: Fats are important for insulation, protection, and energy storage in the body. Good food sources of healthy fats include avocados, nuts, seeds, olive oil, and fatty fish such as salmon.

Explanation:

Answer : The volume of kristas rock is 30 mL.

Explanation :

From the given image we conclude that:

Initial volume of liquid = 150 mL

Final volume of liquid = 180 mL

Now we have to determine the volume of kristas rock.

Volume of kristas rock = Final volume of liquid - Initial volume of liquid

Volume of kristas rock = 180 mL - 150 mL

Volume of kristas rock = 30 mL

Therefore, the volume of kristas rock is 30 mL.

Answer:

Mercury is a thick substance and able to sustain and hold anything with any metallics with metal, such as with water it is not working as water is a thin substance and not able to hold heavy things

Explanation:

The substance which is mixture of two or more than two metals is called as alloy. Alloy is metallic mixture of any elements.

Alloy is the mixture of two or more than two metal . This mixture may be homogenous or heterogenous ,in both of the phase alloy mixture occur. It may be solid or mixture of many phases.

Alloy are classified into two parts i.e. substitutional alloy and interstitial alloy. An example of alloy is red gold which is the mixture of copper and gold. and there is mixture of silver and gold to make an alloy.

There are different types of alloy present in environment like nickel alloy, zinc alloy, bronze alloy , stainless steel alloy. I an alloy contain ferrous metal it will be rust.

Thus, Alloy is the mixture of two or more than two elements.

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In the Bohr model of the atom, to move up or down between the various orbitals, electrons must either absorb or emit energy in the form of photons.

When an electron absorbs a photon with a specific amount of energy, it moves to a higher energy level, or "jumps" to an outer orbital. This process is known as excitation. Conversely, when an electron releases a photon, it loses energy and moves to a lower energy level, or "falls" to an inner orbital, in a process called de-excitation. The energy levels in the Bohr model are quantized, which means that electrons can only occupy specific, discrete energy levels. The energy difference between these levels determines the wavelength and frequency of the emitted or absorbed photon.

Electrons cannot exist between these quantized levels, so they can only move from one orbital to another by absorbing or emitting photons with precisely the right amount of energy. This behavior of electrons in the Bohr model helps explain observed atomic spectra, where only certain wavelengths of light are emitted or absorbed, corresponding to the specific energy differences between the quantized orbitals. So therefore electrons must either absorb or emit energy in the form of photons in the Bohr model of the atom.

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Answer:$$7.50 x 10^23$$

$$H_2SO_4$$?

Explanation:It is a fact that such a quantity has a mass of  

98.08

⋅

g

. Why? Because  

6.022

×

10

23

particles SPECIFIES a molar quantity. And we know (or can calculate) that sulfuric acid has a molar mass of  

98.08

⋅

g

...  

Answer:

Always moving

Explanation:

unless temperature is at 0° Kelvin molecules are are always in motion

The aluminium molecules will be in the state of motion always. Since, the particles inside the metal undergoes thermal vibrations.

Aluminium is 13 the group element in periodic table. It is classified near the group of nonmetals still it is a metal because, it exhibit metallic properties, such as luster, hardness, malleability and ductility.

Metals are electron rich and they are said to be consists of a pool of positive ions and free electrons. The metal lattice consists  of delocalized electrons and they can conduct electricity.

The ions and electrons are under thermal agitation always as stated by the brownian motion of particles. Thus the aluminium molecules inside the bicycle will be in motion not only when the bicycle is moved.

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Answer:

a is 16 as the molar ratio is 4:2=2:1

b is 10 as the ratio is 4:2

To prepare a calibration curve is used A set of solutions with the exact same analyte concentration.

The calibration curve is the graphical representation of the relation in between the concentration or the amount of  substance, and the signal or the measurement obtained from the analytical instrument or the assay. The calibration curve is to constructed by the measuring the signal or the response of instrument or the assay at the different known concentrations and the amounts of substance, and the plotting of these values on the graph.

The resulting curve is used to determine the concentration and the amount of the substance in the unknown sample by the measuring its signal.

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Answer:

D "Before the process, the substance was a liquid. After the process, it was a gas.

Explanation:

hope this helps.

According to the forces of attraction , before the process substance was liquid and after the process it was a gas as gas molecules are farther away than those in liquid.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

Provide more strength

Explanation:

Rust is metal that has been oxidised . Oxides are usually more fragile and porous than their crystals metal equivalents. Some oxides, such as Aluminum oxide, are useful because they have a thin, strong shell that protects the metal from further corrosion.

The answer will be option D) Tyndall effect.

We can identify a solution if light is not visible from it.

We can identify a suspension if some light is visible from it.

We can identify a colloid if all light is visible from it.

The positive sodium ions interact with the negative poles of water molecules, while the negative chloride ions interact with the positive poles.

Sodium chloride (NaCl), commonly known as table salt or simply salt, is a white crystalline chemical compound that is produced by the combination of sodium and chlorine ions in equal quantities.

Ion-dipole forces are a type of intermolecular force that occurs between an ion (charged atom or molecule) and a polar molecule.

These forces are responsible for the solvation of ions in polar solvents like water and are the driving force behind many chemical reactions that occur in solutions.

In the case of sodium chloride in water, ion-dipole forces lead to the dissolution of sodium chloride in water, forming a solution of sodium chloride in water.

Therefore, the positive sodium ions interact with the negative poles of water molecules, while the negative chloride ions interact with the positive poles.

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An example of a chemical change is water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules.

In chemistry, changes are classified into two: physical and chemical.

A physical change occurs when a substance or object changes its appearance, phase, or is used in a mixture. More importantly, a physical change does not change the molecular structure of a substance. These three are examples of physical changes in water, wherein the changes are on their phases only:

water freezing: liquid water becoming solid water

water boiling: solid water becoming gaseous water

water evaporating: liquid water becoming gaseous water

On the other hand, a chemical change takes place when the original substance's of molecules are taken apart and put back together into new combinations that are different from the original combinations. An example of this is water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules, wherein a compound of water molecule is being break down into different molecules.

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