Write balanced equations and Kb expressions for these Brønsted-Lowry bases in water:(a) Guanidine, H₂N₂C = NH (double-bonded N is most basic)

Answer:

Biodiversity will decrease.

Explanation:

Biodiversity will decrease when new fields are cleared and this often leads to habitat loss.

The most likely result of a field being cleared to build homes is the decrease in the biodiversity.

Biodiversity tells about the different kind of lives of living organism on the earth.

Before building a house we always cleared the place where house is going to build and due to this cleaning activity many organism will dead, because of the loss of their habitat. Many small organism like bacteria, fungi, algae, etc. are living in the grass or on the ground and biodiversity balance affects.

Hence, the result of a field being cleared to build homes is the decrease in the biodiversity.

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The basic requirement while writing the electronic configuration of an element (atom) is its atomic number.

Explanation:

    \(1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d...\)

For example:

  The atomic number of gallium is 31, its electronic configuration will be:

   \([Ga]=1s^2 2s^2 2p^63s^2 3p^6 4s^2 3d^{10} 4p^1\)

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Answer:

aluminum can

Explanation:

source: trust me bro im currently working on acid and bases and acid doesnt eat through gold

The object which is most likely to be damaged by an acid is Choice D: An aluminium can.

When an acid undergoes ionization in an aqueous solution, the positively charged ion released is; Hydroxonium ion, H30+.

Aluminium is more reactive than the hydrogen ion. As such, an Aluminium can is most likely to be damaged by an acid.

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The concentration of Ca(OH)2 in the solution is approximately 1.33 x 10^(-6) M.

To find the concentration of Ca(OH)2 in a solution with a pH of 8.57, we need to use the concept of pOH, which is the negative logarithm of the hydroxide ion concentration ([OH-]). The pOH can be calculated by subtracting the pH from 14, which gives us 14 - 8.57 = 5.43.

Since Ca(OH)2 produces two OH- ions for every molecule of Ca(OH)2 that dissolves, the concentration of OH- ions will be twice the concentration of Ca(OH)2. Thus, we have [OH-] = 2x, where x represents the concentration of Ca(OH)2.

Taking the antilogarithm of the pOH, we find that [OH-] = 10^(-pOH) = 10^(-5.43).

Since [OH-] = 2x, we can write 2x = 10^(-5.43) and solve for x.

x = (10^(-5.43))/2 ≈ 1.33 x 10^(-6) M

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87 picograms are equivalent to \(8.7\times 10^{-11}\) grams.

This is a unit problem, in which a derived unit must translated into a fundamental unit. A picogram is a equivalent to a trillionth of a gram, which is the fundamental SI mass unit. Mathematically speaking, we have the following equivalence:

\(1\,pg = 1\times 10^{-12}\,g\)

Now we proceed to find the equivalent value for this case:

\(87\,pg\)

\(87\times 10^{-12}\,g\)

\(8.7\times 10^{-11}\,g\)

87 picograms are equivalent to \(8.7\times 10^{-11}\) grams.

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There are several solvents that can be used to dissolve an oil stain. One of the most effective solvents is mineral spirits, also known as white spirits.

It is a petroleum-based solvent that is widely used for cleaning and degreasing purposes. Another commonly used solvent is acetone, which is a colorless liquid that is also used as a solvent for various organic compounds. Additionally, rubbing alcohol, also known as isopropyl alcohol, can be used to dissolve oil stains. It is a colorless liquid that is commonly used as an antiseptic and disinfectant. However, it is important to note that some solvents may not be suitable for certain types of fabrics or surfaces, so it is always best to test a small area first before applying the solvent to the entire stain.
To dissolve an oil stain, you can use solvents such as acetone, rubbing alcohol (isopropanol), or white spirit. These solvents are effective in breaking down oil molecules and removing stains from surfaces. However, always test a small, inconspicuous area before applying any solvent to ensure compatibility with the material and avoid any potential damage. Additionally, ensure proper ventilation and safety precautions when handling these chemicals.

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The pH of Mystery H2SO4, assuming a concentration of 0.06 M, would be 1.22. To estimate the pH of the strong acid mystery solutions (Mystery HBr and Mystery H2SO4), we can use the formula pH = –log10[H+].

It's important to note that due to incomplete dissociation, our answers may vary slightly from the values in the Gizmo. However, this method should give us a close estimate of the pH for each solution based on the concentrations .

However, we need to first determine the concentrations of these solutions, M, respectively. Once we know the concentration of each solution, we can plug it into the formula to find the pH.
For Mystery H2SO4, we know the concentration. M. Let's assume for the sake of example that we found the concentration to be 0.06 M.
To find the pH, we can plug this concentration into the formula:
pH = –log10[H+]
pH = –log10[0.06]
pH = 1.22

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True.

Boron trifluoride (BF3) is a polar molecule because it contains polar covalent bonds and the molecular geometry of the molecule is trigonal planar.

The boron atom has a partial positive charge while the fluorine atoms have a partial negative charge due to the electronegativity difference between them. This creates a net dipole moment in the molecule making it polar.

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One mole of magnesium chloride has a mass of 95 g. Then the mass of 4.25 moles of magnesium chloride (MgCl₂) is 403.7 g.

Magnesium chloride is an ionic compound with the chemical formula, MgCl₂. It formed through the donation of two valence electrons from the metal magnesium to the chlorine atoms.

The mass of one mole of a compound is called its molar mass. The number of moles of the compound is then the ratio of its given mass to the molar mass.

Atomic mass of Mg = 24 g/mol

atomic mass of Cl = 35.5 g/mol

mass of 2 Cl = 71 g

Then, molar mass of MgCl₂ = 24 +  71 g = 95 g/mol

One mole of  MgCl₂ is 95 g. Then, mass of 4.25 moles of MgCl₂ is

4.95 × 95 = 403.7 g

Therefore, the mass of 4.95 moles of MgCl₂ is 403.7 g.

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The phrase "extreme environmental thermal shock induced dislocation-rich pt nanoparticles boosting hydrogen evolution reaction" refers to a process involving platinum (Pt) nanoparticles that have a high concentration of dislocations. These nanoparticles are exposed to extreme thermal shock in the environment.

To illustrate this concept, consider the analogy of a road. The Pt nanoparticles are like cars, and the dislocations are like speed bumps or potholes on the road. When the cars encounter these obstacles (dislocations), they experience a sudden jolt or shock (thermal shock). This disruption in their path increases their efficiency in reaching their destination (boosting the HER). The more dislocations present in the nanoparticles and the greater the thermal shock, the more pronounced the effect on the HER.

It's important to note that this specific concept may require a deeper understanding of materials science and electrochemistry. If you have any further questions or need clarification on any specific aspect, please feel free to ask.

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The hydrogen atoms are each sharing a single bond, which means they are each sharing one electron. All atoms have a full valence shell, and there are no lone pairs left. Therefore, the Lewis structure for \(N_2H_2\)(HNNH) is.

H       H

 \     /

  N==N

 /     \

H       H

A lone pair is a pair of electrons that is not involved in bonding with other atoms or molecules. Lone pairs are typically found in the valence shell of atoms, which is the outermost shell of electrons that participates in chemical reactions. These pairs of electrons are called "lone" because they are not shared with another atom or molecule to form a covalent bond.

Lone pairs can have a significant impact on the chemical and physical properties of a molecule. For example, they can influence the shape and polarity of a molecule, which in turn can affect its reactivity and interactions with other molecules. In some cases, lone pairs can even participate in chemical reactions, such as in acid-base chemistry. The presence and location of lone pairs can be predicted using molecular orbital theory and can be observed using techniques such as X-ray crystallography or infrared spectroscopy.

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Answer:

Complex carbohydrates have more chemical bonds to break than simple sugars, which takes longer for the body to digest and provides more units of energy for the body to use.

Explanation:

Complex carbohydrates contain longer chains of sugar molecules than simple carbohydrates. The body converts these sugar molecules into glucose, which it uses for energy. As complex carbohydrates have longer chains, they take longer to break down and provide more lasting energy in the body than simple carbohydrates.

Answer

The answer is A if you want it simplifited.

from the guy above

The percentage yield of the iron is obtained as 71.4 %.

We know that the stoichiometry of a reaction can help us to be able to find the amount of the substances that have been used in a process. In this case, we have been shown the balanced reaction equation of the reaction in the image that have been attached to the question.

We can see that;

Mass of the iron III oxide = 80 tonnes or 8 * 10^7 g

Mass of iron produced =  40 tonnes of 4 * 10^7 g

Number of moles of iron III oxide reacted = 8 * 10^7 g/160 g/mol

= 5 * 10^5 moles

If 1 mole of iron III oxide produces 2 moles of iron

5 * 10^5 moles of iron III oxide produces;

5 * 10^5 moles * 2 moles/ 1 mole

= 1 * 10^6 moles

Theoretical yield of the iron =   1 * 10^6 moles * 56 g/mol

= 5.6 * 10^7 g

Percent yield = actual yield/Theoretical yield * 100/1

= 4 * 10^7 g/5.6 * 10^7 g * 100/1

= 71.4 %

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Answer:

11.54

Explanation:

-log(3.50*10^-3) = 2.46 pOH

pH = 14 - pOH

pH = 11.54

Answer:

Taste (gustation) and smell (olfaction) are called chemical senses because both have sensory receptors that respond to molecules in the food we eat or in the air we breathe. There is a pronounced interaction between our chemical senses.

Explanation:

hope this helps

Answer: In Arizona, climate change is already making deadly heat waves, droughts and wildfires across the state worse. These impacts have real costs on Arizonans' health and economy, including heat-related deaths, higher electricity bills, crop losses and more.

Explanation:

https://www.edf.org/climate/costofinaction- this is where I gathered this info.  Not mine.  But I hope it helps!

Answer:

a) 1s22s22p63s1

b) 3s² 3p¹

c) 1s22s22p63s23p3

d) 3s² 3p⁵

e) 3s2

f) 1s22s22p63s23p2

g) 1s22s22p63s23p4

h) 3s² 3p⁶

Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

the answer is D. The rain cycle says that Evaporation turns water into gas

The empirical formula for the hydrocarbon as \(C_{15}H_{18}O\), which is simplified to CH₂.

A hydrocarbon is an organic compound made up of only hydrogen and carbon atoms. Examples of hydrocarbons include gasoline, methane, propane, and butane. Hydrocarbons are the primary components of petroleum and natural gas, and are found naturally in the environment. They are also used as raw materials for a variety of products, including plastics and pharmaceuticals.

The empirical formula of a hydrocarbon can be determined by using the following equation:

Molecular mass of hydrocarbon = (Mass of CO₂ x 12) + (Mass of H₂O x 18)
In this case, the molecular mass of the hydrocarbon is: (17.3 g x 12) + (8.83 g x 18) = 180.54 g/mol

To calculate the empirical formula, we divide the molecular mass by the molar mass of the elements in the hydrocarbon:

180.54 g/mol ÷ 12 (for Carbon) = 15.04 g/mol

180.54 g/mol ÷ 1 (for Hydrogen) = 180.54 g/mol

This gives us the empirical formula for the hydrocarbon as \(C_{15}H_{18}O\), which is simplified to CH₂.

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The spectrometer is always re-calibrated to zero to make sure that the absorbance measure is purely of the sample itself.

Spectroscopy is a general term used for the instrumental processes by which we can get the information about molecular structure through the careful analysis of the absorption, scattering, or emission of electromagnetic radiation by compounds.

Some of the applications of mass spectrometry include drug testing, food contamination detection, pesticide residue analysis, isotope ratio determination, protein identification, and carbon dating.

So considering the above question we usually  blank the spectrophotometer before taking any measurements because this makes sures that the absorbance measured in the samples is purely only to the sample material and not the components of the solution the sample is suspended in or the cuvette. We also make sure to wipe the sides of the cuvette.

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To ensure that the absorbance measurement is purely of the sample, the spectrometer is always re-calibrated to zero.

A spectrometer is a scientific instrument for separating and measuring the spectral components of a physical phenomenon. Spectrometer is a broad term that often refers to instruments that measure a continuous variable of a phenomenon in which the spectral components are mixed in some way. A spectrometer, in the broadest sense, is any instrument used to measure the variation of a physical characteristic over a given range, i.e. a spectrum.

Other types of spectrometers include mass spectrometers and nuclear magnetic resonance (NMR) spectrometers, but unless otherwise specified, the term 'spectrometer' refers to optical devices (and similarly, 'spectroscopy' refers to optical spectroscopy).

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Answer:

I'm sorry, but I cannot see the observations or the data table you mentioned in your question. However, I can still provide you with some general guidance on how to approach the calculations and answer the questions based on the given information.

4. To calculate the concentration of the NaOH solution, you need to know the mass of NaOH used and the volume of the solution. The formula to calculate concentration is:

Concentration (in mol/L) = (Mass of NaOH (in grams) / molar mass of NaOH) / Volume of solution (in L)

Make sure to convert the mass of NaOH to moles by dividing it by the molar mass of NaOH. The molar mass of NaOH is the sum of the atomic masses of sodium (Na), oxygen (O), and hydrogen (H).

5. The balanced equation for the neutralization reaction between NaOH and HCl is:

NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

(aq) represents an aqueous solution, and (l) represents a liquid.

6a. To calculate the average concentration of HCl in the sample from site B, you need to know the volumes and concentrations of the NaOH and HCl solutions used in the titration. Use the formula:

Concentration of HCl (in mol/L) = (Volume of NaOH solution (in L) * Concentration of NaOH (in mol/L)) / Volume of HCl solution (in L)

Multiply the volume of NaOH solution used by its concentration to find the amount of NaOH used. Then, divide this amount by the volume of HCl solution used to find the concentration of HCl.

6b. To determine the pH of the water at site B, you need to know the concentration of HCl from the previous calculation. The pH can be calculated using the formula:

pH = -log10[H+]

Since HCl is a strong acid, it dissociates completely into H+ ions. Therefore, the concentration of H+ ions is equal to the concentration of HCl. Take the negative logarithm (base 10) of the H+ concentration to find the pH.

To check if the water is safe, compare the calculated pH value to the range provided (pH 4.5-7.5). If the pH falls within this range, the water is considered safe for plant and animal reproduction in an aquatic environment.

6c. Use a similar calculation as in 6a to determine the average concentration of HCl in the sample from site C.

6d. Use the concentration of HCl from 6c to calculate the pH using the formula in 6b. Follow the same procedure to check if the water is safe based on the pH range.

7. To find the most current pH value for the Grand River, you can search for the latest data from reliable sources such as environmental agencies, research institutions, or government websites. Compare this pH value to the pH values obtained in the experiment to assess the difference between them.

Remember, without the specific data and observations, the calculations and comparisons provided here are only general guidelines. It's important to use the actual data from your experiment to obtain accurate results and conclusions.

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Answer:

182.94 g/mol is the correct

Explanation:

hope this helps

Answer:

Your answer would be:
182.94 g/mol

Explanation:

Have a great rest of your day
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In electron capture, an atomic electron is absorbed by a proton in the nucleus, turning the proton into a neutron. The electron starts as a regular atomic electron, with its wavefunction spreading through the atom and overlapping with the nucleus.

Hopefully this is helpful sorry for no explanation i am not good at explaining things

Dimethylsulfoxide has the formula C2H6SO.Therefore, the correct answer is option D: 25.4.

Option D.

To determine the mass percent of carbon in this compound, we need to calculate the molar mass of the compound first. Molar mass is the sum of the atomic masses of all the atoms in the molecule. We can use the periodic table to obtain the atomic masses. For this compound, the molar mass will be:2 (atomic mass of carbon) + 6 (atomic mass of hydrogen) + 32 (atomic mass of sulfur + 16 (atomic mass of oxygen) = 78 g/molNext, we need to determine the mass of carbon in one mole of the compound. We can do this by multiplying the number of carbon atoms by the atomic mass of carbon. In this case, there are 2 carbon atoms in one mole of the compound. Therefore, the mass of carbon in one mole of the compound is:2 (number of carbon atoms) x 12.01 (atomic mass of carbon) = 24.02 g/molFinally, we can calculate the mass percent of carbon in dimethylsulfoxide using the formula:mass percent of carbon = (mass of carbon / total molar mass) x 100%Substituting the values we obtained:mass percent of carbon = (24.02 g/mol / 78 g/mol) x 100% = 30.77%Rounding to three significant figures gives us a final answer of 30.7%.

Option D.

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Answer:

Elements are all the subtances on the periodic table. Compound are elements that are fused by chemical means like potassium chloride. Mixture are elements that are not chemically fused but just in a sense mixed together.