Will the following reaction result in a precipitate? If so, identify the precipitate.K3PO4 + Cr(NO3)+ 3 KNO3 + CrPO4A. No, a precipitate will not formB. Yes, CrPO4 will precipitateC. Yes, KNO3 will precipitate

The number of valence electrons in each of the atoms are;

B - 3

Al - 3

Cl - 7

Ne - 8

We define an atom as the smallest part of a substance that can take part in a chemical reaction. We know that when we begin to break down the elements that the atoms can be found in the element and there are sub atomic particles that can also be found inside the atom of the element.

The electrons that are found at the last shell or the outermost shell of the atom are the ones that we call the valence electrons that can be found in the atom.

The electronic configuration of boron is \(1s^2 2s^2 2p^1\) (the n =2 level is the valence shell)

The electronic configuration of Al is \(1s^2 2s^2 2p^6 3s^2 3p^1\)( the n= 3level is the valence shell)

The electron configuration of Cl is \(1s^2 2s^2 sp^6 3s^23p^5\) ( the n= 3level is the valence shell)

The electron configuration of Ne is \(1s^2 2s^2 2p^6\) (the n =2 level is the valence shell)

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Answer: A (in your answer order)

Answer:

they can bond together to form very long, durable chains that can have branches or rings of various sizes and often contain thousands of carbon atoms. Silicon and a few other elements can form similar chains; but they are generally shorter, and much less durable.

Explanation:

Answer:

Explanation:

h

The given statement "The molar enthalpy of sublimation of a given substance can be determined if its enthalpies of fusion and vaporization are known" is true.

The molar enthalpy of sublimation of a substance can be determined if its enthalpies of fusion (melting) and vaporization (boiling) are known. The enthalpy of sublimation refers to the energy required to change a substance from the solid phase directly to the gaseous phase, bypassing the liquid phase.

The enthalpy change during sublimation can be calculated by considering the enthalpies of fusion and vaporization. When a substance undergoes sublimation, it first requires energy to melt from the solid phase to the liquid phase (enthalpy of fusion) and then additional energy to vaporize from the liquid phase to the gaseous phase (enthalpy of vaporization). The sum of these two enthalpies represents the overall energy change during sublimation.

Therefore, by adding the enthalpy of fusion and the enthalpy of vaporization, one can determine the molar enthalpy of sublimation for a given substance.

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Answer:

The frequency of calibration for a colorimeter will depend on the specific model and the environment in which it is used. Generally, it is recommended to calibrate the colorimeter at least once a year, or more often if the instrument is used in a harsh environment.

The frequency of calibration for a colorimeter will depend on the specific model and the environment in which it is used.  Thus,it is recommended to calibrate the colorimeter at least once a year.

A colorimeter is a device used in colorimetry that measures the absorbance of particular wavelengths of light by a specific solution.It is commonly used to determine the concentration of a known solute in a given solution by the application of the Beer–Lambert law, which states that the concentration of a solute is proportional to the absorbance.

The absorbance is fluctuated in harsh environments thus,it is recommended to calibrate the colorimeter at least once a year.

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Answer:

Octet is inactive because it has a filled shell of electrons or the atom doesn't need to either gain electrons.

The increasing order of ions are Sr²⁺ <  Br < Se²⁻ ,  the one with the biggest negative charge will have the most elevated nuclear sweep .

Among the isoelectronic particles, the one with the biggest negative charge will have the most elevated nuclear sweep and the one with the biggest positive charge will have the littlest nuclear span. This indicates that Sr²⁺ will be the smallest ion among Sr²⁺, Rb⁺, Br, and Se²⁻ .

Anions are ions with a negative charge, while cations are ions with a positive charge. The amount of electrostatic attraction between the nucleus' protons and electrons can alter the size of an atomic radii. Ions that lose electrons typically squeeze the last few electrons closer together, shrinking them. Particles that gain electrons by and large don't have adequate positive charge from the core to attract them, and in this way, the sweep gets bigger.

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Answer:the water starts to boil and creates steam

Explanation:

Answer:

First one answer is physical and other remaning chemical

Answer:

Hydrogen is a colorless, tasteless, and odorless gas.  

physical

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Hydrogen is very combustible in the presence of oxygen.  

chemical

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Hydrogen is very reactive with most elements.  

chemical

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Hydrogen is the least dense of all elements.  

physical

The mass of CCl₂F₂ that must evaporate is 231 g.

we need to calculate the heat exchanged during the phase change of water from liquid to solid (freezing) and the heat exchanged during the phase change of CCl₂F₂ from liquid to gas (vaporization).

Then we can equate these two quantities to find the mass of CCl₂F₂ that must evaporate.

The heat exchanged during the freezing of water can be calculated using the formula:

fusion = mass of water × heat of fusion

Given:

mass of water = 200 g

the heat of fusion of water = 334 J/g

fusion = 200 g × 334 J/g = 66800 J

The heat exchanged during the vaporization of CCl₂F₂ can be calculated using the formula:

vaporization = mass of CCl₂F₂ × heat of vaporization

Given:

the heat of vaporization of CCl₂F₂ = 289 J/g

We need to find the mass of CCl₂F₂ that will release 66800 J of heat during vaporization.

mass of CCl₂F₂ = Q_fusion / heat of vaporization = 66800 J / 289 J/g = 231.15 g

Thus, rounding to three significant figures, the mass of CCl₂F₂ that must evaporate is 231 g.

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Answer:

Explanation:

When we say anything is a wave, what exactly do we mean? The most intuitive and straightforward wave to envision is a water wave. A motion, more specifically, is a disturbance that propagates or travels away from its source. Water waves are caused by a disruption in the water's surface, such as a rock tossed into a pond or a swimmer splashing the surface continuously. The noise for sound waves is a rise of air pressure, which may be caused by the oscillating cone within a speaker. There are many kinds of disturbances in earthquakes, including surface disturbances and pressure disturbances under the surface. Even radio signals are best deciphered by using a comparison of sea waves Water waves are helpful to visualize since they are more than just a mental picture. The amplitude, period, frequency, and energy of water waves are all the same as they are for all waves. A small set of underlying principles can be used to describe all wave characteristics.

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Answer:

The process of a solid becoming a liquid is called melting. (an older term that you may see sometimes is fusion). The opposite process, a liquid becoming a solid, is called solidification. For any pure substance, the temperature at which melting occurs—known as the melting point—is a characteristic of that substance.

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This battery could be made stronger when we make lithium the anode and make zinc the cathode.

We know that the term electron affinity has to do with the fact the a specie is able to attract electrons. Hence, the specie that can be able to attract electrons is said to be have a greater electron affinity.

If we look at the order of the reactivity of the metals, we can see that the lithium has more tendency to exist as a positive ion as such the electron affinity of the lithium atom is very negative and it does not attract electrons.

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Answer:

l, ll, lll, v

Explanation:

I just took the test ;)

The answer is D.

Activated complex

Answer:

A group of cells ready to form roots a stem and the first leaves

The cation formed when a sodium atom loses an electron is called the sodium ion, which is represented by the symbol Na+.

This ion is commonly found in many chemical compounds and is important for various biological processes. When sodium atoms react with nonmetals, such as halogens, they form ionic compounds called sodium halides.

The loss of an electron by sodium creates a positively charged ion, which is attracted to negatively charged ions or molecules.

This attraction forms strong ionic bonds that hold the compound together. The correct answer to the given question is option d.

It is important to note that the terms "sodate ion", "sodide ion", and "soda ion" are not used to describe the cation formed by the loss of an electron from a sodium atom.

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The method of choice to quantitate the concentration of ethanol, methanol, isopropanol, and acetone in the blood is gas chromatography (GC).

The method of choice to quantitate the concentration of ethanol, methanol, isopropanol, and acetone in the blood is gas chromatography (GC).

GC is a powerful analytical technique that is widely used for the separation and analysis of volatile and semi-volatile compounds in complex mixtures.

The method involves the injection of a sample into a chromatographic column, where the different compounds in the mixture are separated based on their physical and chemical properties, such as boiling point, polarity, and molecular weight.

The separated compounds are then detected by a detector and their concentrations are quantified.

GC is a highly sensitive and specific technique that can detect and quantify trace amounts of different compounds in a sample, making it an ideal method for the analysis of drugs, toxins, and other compounds in biological samples such as blood.

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Answer:

Xe that is xenon

Explanation:

Xe that is xenon

Ferrihydrite in forest soil at pH=5 is more likely to sorb benzene than 2,4-D. At pH=4, the sorption potential of 2,4-D to ferrihydrite may be enhanced due to increased positive charge on the surface of the hydroxide.

Ferrihydrite, a type of iron oxide, has the ability to sorb organic compounds through various mechanisms such as surface complexation, hydrogen bonding, and hydrophobic interactions. Benzene, being a non-polar compound, is more likely to sorb to ferrihydrite due to hydrophobic interactions and weak van der Waals forces. On the other hand, 2,4-D, being a polar compound, may have limited sorption to ferrihydrite at pH=5 due to the dominance of repulsive interactions between the negatively charged surface of ferrihydrite and the negatively charged 2,4-D molecule.

At pH=4, the increased positive charge on the surface of ferrihydrite enhances the sorption potential of 2,4-D. The positive charge can attract and bind with the negatively charged 2,4-D molecule through electrostatic interactions. This can result in increased sorption of 2,4-D to ferrihydrite in tropical soils like Qxisol.

Conversely, at pH=9, the increased pH results in a decrease in the positive charge on the surface of ferrihydrite. This reduction in positive charge limits the sorption potential of 2,4-D as the electrostatic attraction between the hydroxide and the 2,4-D molecule decreases. This suggests that in arid soils like Aridisol, characterized by higher pH levels, the sorption potential of 2,4-D to ferrihydrite may be lower compared to humid climates.

The sorption potential of 2,4-D as a function of soil type in humid vs. arid climates can be predicted by considering the pH of the soil. Higher pH in arid soils can lead to reduced sorption of 2,4-D to hydroxides like ferrihydrite or goethite, while lower pH in humid soils can enhance the sorption potential due to increased positive charge on the hydroxide surface.

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If you want to distinguish between the contents of two unlabeled cups, one containing Powerade White Cherry and the other containing Canada Dry Club Soda, you can use a pH indicator.

To impress your roommates with your chemistry skills, you need to select an indicator that can differentiate between the two based on their pH values. Powerade White Cherry has a pH of 2.8 while Canada Dry Club Soda has a pH of 5.2.

Looking at the table of pH indicators, there are two options that cover the pH range of both substances: Bromothymol blue and Phenolphthalein. However, Bromothymol blue has a pH range of 6.0-7.6, which is not low enough to detect the acidity of Powerade White Cherry.

Hence, choose Phenolphthalein, which has a pH range of 8.2-10.0, encompassing both 2.8 and 5.2. By using Phenolphthalein as an indicator, you can impress your roommates with your chemistry knowledge and successfully distinguish between the two cups.

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FALSE. Bent molecules do not have lone pair on the central atom.

Bent molecules is a kind of molecular geometry in which the central atom has two lone pairs of electrons and is associated with two bond pairs.

The molecular structure is also known as angular or V-shaped.

Thus, the statement "bent molecules do not have lone pair on the central atom"  is FALSE.

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Explanation:

If the pH is between 0 and 7, then we have an acid.

If the pH is between 7 and 14, then we have an alkaline base.

If pH = 7, then it's neutral.

Answer:

0-7

Explanation:

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When CO₂ is heated from 15°C to 37°C, its molar internal energy changes by 2446.2 J/mol, as does its molar enthalpy.

The following equation can be used to determine how carbon dioxide (CO₂) will change in molar enthalpy and molar internal energy when heated from 15 to 37 degrees Celsius:

ΔH = ΔU + ΔnRT

ΔU = nCvΔT

where:

ΔH = change in molar enthalpy of CO₂ (in J/mol)

ΔU = change in molar internal energy of CO₂ (in J/mol)

Δn = change in moles of CO₂ (in mol)

R = universal gas constant (8.314 J/(mol·K))

T = temperature (in K)

Cv = molar heat capacity at constant volume (in J/(mol·K))

ΔT = change in temperature (in K)

First, let's calculate the change in temperature:

ΔT = T2 - T1

= (37 + 273.15) K - (15 + 273.15) K

= 22 K

Next, let's calculate the change in molar internal energy:

ΔU = nCvΔT

= 3 mol × 37.1 J/(mol·K) × 22 K

= 2446.2 J/mol

Now, let's calculate the change in molar enthalpy using the equation:

ΔH = ΔU + ΔnRT

where Δn = 0 because the number of moles of CO₂ does not change during heating. Therefore:

ΔH = ΔU + ΔnRT

= 2446.2 J/mol + 0 mol × 8.314 J/(mol·K) × (37 + 273.15) K

= 2446.2 J/mol

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