what ph is required to reduce a high concentration of a dissolved mg2 to 25 mg/l? the solubility product for the following reaction is 10-11.16.

A pyrophoric substance is a material that ignites spontaneously in the presence of air or oxygen at or below room temperature.

The exact temperature required for a pyrophoric substance to ignite spontaneously depends on the specific material and the conditions under which it is being used.

In general, pyrophoric substances have a low ignition temperature, typically between 200-400°C (392-752°F). However, some pyrophoric materials can ignite at much lower temperatures, such as iron powder, which can ignite spontaneously at temperatures as low as 80°C (176°F).

The ignition temperature of a pyrophoric material can also depend on the specific conditions under which it is being handled. For example, a pyrophoric substance may ignite more easily if it is finely divided or if it is exposed to moisture or other reactive substances.

It is important to handle pyrophoric substances with care and to follow appropriate safety protocols to minimize the risk of ignition and fire. This may include storing pyrophoric materials in a dry, inert atmosphere and using appropriate personal protective equipment when handling them.

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The molecular geometry of silicon dioxide is linear and bonding in it  is covalent due to which it is a suitable material for making welding blankets.

Molecular geometry is  defined as a three -dimensional arrangement of atoms which make up  the molecule.It includes parameters such as bond length,bond angle and torsional angles.

It influences many properties of molecule such as reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

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Answer:

I

Explanation:

Among the halogens given in this problem, iodine has the lowest attraction for electrons.

This property is known as electronegativity.

Electronegativity is expressed as the relative tendency with which the atoms of the element attracts valence electrons in a chemical bond.

The balanced chemical equation for this reaction is:
CaCO3 + 2HCl -> CaCl2 + CO2 + H2O
The hydronium ion concentration of the resulting solution was measured to be 0.8734 M.
pH = -log[H3O+]
pH = -log[0.8734] = 0.06.

Chalkboard chalk, composed of calcium carbonate, can be dissolved using hydrochloric acid. In your experiment, a small piece of chalk was placed in 50 mL of 0.9261 M hydrochloric acid. As the reaction occurred, CO2 bubbles were observed, indicating the reaction between calcium carbonate and hydrochloric acid. When the reaction completed, no solid remained in the solution, and the hydronium ion concentration was 0.8734 M..The reaction consumed all of the calcium carbonate in the chalk, as no more solid remained in the solution. The resulting solution contained calcium chloride and hydronium ions (H3O+), which were formed by the dissociation of the hydrochloric acid.
Overall, the reaction between calcium carbonate and hydrochloric acid is a common example of an acid-base reaction. The hydrochloric acid acts as the acid, donating a hydrogen ion (H+) to the calcium carbonate, which acts as the base. This results in the formation of calcium chloride, water, and carbon dioxide gas.

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Answer:

The loss of Arctic sea ice can cause changes in atmospheric pressure patterns, leading to a weaker jet stream and an increased likelihood of high-pressure systems over the North Atlantic. This, in turn, can disrupt ocean currents such as the North Atlantic Current, which can have a significant impact on the climate near the Western European coast.

Explanation:

hope this helps

The given question is incomplete the complete question is  

The police have made a drug bust and confiscated a large quantity of suspected cocaine. The police bring a sample to you, a forensic chemist, for analysis. The chemical formula of cocaine is C17H21NO4. After analyzing the mystery compound you find that it is 67.296% carbon,6.991% hydrogen, 4.618% nitrogen, and 21.095% oxygen. You also find that it has a molar mass of 303.35g/mol

Calculate the mystery compound’s empirical formula. Show full solutions.

The police have made a drug bust and confiscated a large quantity of suspected cocaine the police bring a sample to you, a forensic chemist, for analysis the chemical formula of cocaine is C₁₇H₂₁NO₄. After analyzing the mystery compound you find that it is 67.296% carbon,6.991% hydrogen, 4.618% nitrogen, and 21.095% oxygen. You also find that it has a molar mass of 303.35g/mol and the mystery compound is  C₁₇H₂₁NO₄  means cocaine

The cocaine is the local anesthetic and it is also used for to cause loss of feeling or numbness and drug is the any substances that is used to prevent, diagnose, treat and relieve symptoms of abnormal condition and drugs can also affect how the brain and the rest of the body work and cause changes in mood, awareness, thoughts, feelings, or behavior

Here given chemical formula of cocaine is C₁₇H₂₁NO₄ and in that carbon percentage is 67.296%  and hydrogen percentage is ,6.991%,  nitrogen percentage is 4.618%, and oxygen percentage is 21.095% and given molar mass is 303.35g/mol then

We have to find mystery compound’s empirical formula =?

So given mass/molar mass

Then we have to find mole ratio and number of moles so here 67.296% carbon then  67.296/303.35g/mol = 0.22g

6.991% hydrogen = 6.991/303.35g/mol = 0.023g

4.618% nitrogen = 4.618/303.35g/mol  = 0.015g

21.095% oxygen = 21.095/303.35g/mol = 0.069g

Mass of carbon/molar mass of carbon

67.296/12 = 5.6 mole

Mass of hydrogen/molar mass of hydrogen

6.991/1 = 6.9 mole

Mass of oxygen/molar mass of oxygen

21.095/16 = 1.3 mole

Mass of nitrogen/molar mass of nitrogen

4.618/14 = 0.32 mole

So now dividing the smallest mole then in that 0.32 is the smallest mole

5.6 mole carbon/0.32 mole = 17

6.9 mole hydrogen/0.32 mole = 21

1.3 mole of oxygen/0.32 mole = 4

0.32 mole of nitrogen/ 0.32 mole = 1

So the empirical formula is C = 17, H = 21, O = 4, N = 1

So, C₁₇H₂₁NO₄

And the mystery compound is C₁₇H₂₁NO₄

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Answer:

169.913616 g/mol

Explanation: This is weight of AsF5 molecular weight

Answer:

24 hours

Explanation:

You can safely leave peeled potatoes in the refrigerator for 24 hours. It's a great way to get a head start on your holiday meal preparation. As the Idaho Potato Commission notes, you can keep both whole, peeled potatoes or cut potatoes in the refrigerator.

Answer:

decompression melting

Explanation:

if not then flux melting

91.9 grams of potassium phosphate are produced from 72.9 grams of KOH.

The balanced chemical equation for the given reaction is:

3 KOH + H₃PO₄ → K₃PO₄ + 3 H₂O

From the balanced equation, we can see that the stoichiometric ratio of KOH to K₃PO₄ is 3:1. This means that for every 3 moles of KOH reacted, 1 mole of K₃PO₄ is produced.

First, we need to calculate the number of moles of KOH present in 72.9 g of KOH. The molar mass of KOH is 56.11 g/mol, so the number of moles of KOH is:

72.9 g KOH × (1 mol KOH/56.11 g KOH) = 1.30 mol KOH

Now, using the stoichiometric ratio from the balanced equation, we can calculate the number of moles of K₃PO₄ produced:

1.30 mol KOH × (1 mol K₃PO₄/3 mol KOH) = 0.433 mol K₃PO₄

Finally, we can use the molar mass of K₃PO₄ to convert from moles to grams:

0.433 mol K₃PO₄ × (212.27 g K₃PO₄/mol) = 91.9 g K₃PO₄

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The free energy change for the reaction at 35 ∘C is -1157.45 KJ

Gibbs free energy also termed as the Gibbs energy as well as free enthalpy, or Gibbs function is a quantity which is also used to measure the maximum amount of work done in thermodynamic system when the pressure and temperature are kept constant.

Formula of Gibb's free energy is as follows:

ΔG = ΔH -TΔS

ΔH =1269.8 kJ

ΔS= -364.6 J/K

T = 35ºC = 308.15

ΔS = x 0.001 = 0.3646

ΔG = 1269.8 kJ -(308.15x-0.3646)

ΔG = -1157.45 kJ

Therefore, it is a spontaneous process.

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The unit of measurement for specific heat is Joules per g times degree Celsius.

Similar to density, color, etc., specific heat is an intense feature that is independent of the amount of a substance present. This enables the use of heat specificity to identify compounds.

q = mcT, where q is the quantity of heat applied, m is the mass of the substance, c is its specific heat, and T is the temperature change.

Therefore, we can simply isolate the term in the calculation above to get c=qmT if we wish to find the units for specific heat.

We may calculate that c = JgC since heat is measured in Joules (J), mass in grams (g), and degree Celsius (C).

As a result, the unit of measurement for specific heat is Joules per g times degree Celsius.

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1. AldohexoseAldohexose refers to a hexose that contains an aldehyde functional group. An example of this is glucose, which has the formula C6H12O6 and the structural formula H-(C=O)-(CHOH)5-H.

2. Reducing sugarA reducing sugar is a type of sugar that is able to act as a reducing agent due to the presence of a free aldehyde or ketone functional group. When these groups are present, they can undergo oxidation-reduction reactions. Examples of reducing sugars include glucose, fructose, maltose, and lactose.

3. HemiacetalA hemiacetal is a compound that has an -OH group and an -OR group (which can be any alcohol) attached to the same carbon atom. In other words, it is a compound that has both an alcohol and an ether functional group. Hemiacetals can be formed by the reaction of an aldehyde or ketone with an alcohol. For example, glucose can undergo a reaction with an alcohol to form a hemiacetal.

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The more unusual the value is relative to the other values in the dataset .In this case, the z-score for the systolic blood pressure is 2.18, while the z-score for the heart rate is -1.74. Since the absolute value of the z-score for the systolic blood pressure is larger than that of the heart rate, it can be concluded that the systolic blood pressure value is more unusual relative to the other patients in the sample as compared to the patient's heart rate value.

Question 24Given: Mean systolic blood pressure = 132 mm

Hg; standard deviation of systolic blood pressure = 33;

Systolic blood pressure of patient = 204 mmHg

.The formula to calculate z-score = `(x - μ) / σ`

Where, `x` is the value of the variable,

`μ` is the mean of the variable,

`σ` is the standard deviation of the variable

.Substituting the values, we getz-score = `(204 - 132) / 33 = 2.18`

Therefore, the z-score associated with the systolic blood pressure value of 204 mmHg is 2.18

. Question 25

Given: Mean heart rate = 99 bpm;

standard deviation of heart rate = 27;

Heart rate of patient = 52 bpm.

The formula to calculate z-score = `(x - μ) / σ

`Where, `x` is the value of the variable,

`μ` is the mean of the variable,

`σ` is the standard deviation of the variable.

Substituting the values, we getz-score = `(52 - 99) / 27 = -1.74

`Therefore, the z-score associated with the heart rate of 52 bpm is -1.74.

Question 26

Z-score can be used to compare two different data sets. The absolute value of the z-score shows how many standard deviations the value is away from the mean. Hence, the larger the absolute value of the z-score, the more unusual the value is relative to the other values in the dataset.In this case, the z-score for the systolic blood pressure is 2.18, while the z-score for the heart rate is -1.74. Since the absolute value of the z-score for the systolic blood pressure is larger than that of the heart rate, it can be concluded that the systolic blood pressure value is more unusual relative to the other patients in the sample as compared to the patient's heart rate value.

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(a) Liquid is a state of matter and it has no finite shape due to the arrangement of its molecules.

(b) Ice is a solid state of mater while vapor is gaseous state of mater

(c) Gas molecules are always in constant motion with great kinetic energy, and can easily be ignited.

Liquid is a state of matter and it has no finite shape due to the arrangement of its molecules rather liquids assume the shape of their container.

Ice is a solid state of mater while vapor is gaseous state of mater. The molecules of the ice are closely packed together leading to its heavier weight when compared to vapors whose molecules are far from each other.

Gas molecules are always in constant motion with great kinetic energy, and can easily be ignited.

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We can infer from the passage that humans (C) rely on a variety of resources from ecosystems.

Ecosystems provide us with essential resources for our survival and well-being, including food, water, shelter, and energy. These resources come in various forms and support a wide range of human activities, such as agriculture, industry, and recreation. Additionally, ecosystems contribute to climate regulation, nutrient cycling, and waste decomposition, all of which are crucial for maintaining a healthy environment for humans and other living organisms.

By relying on diverse resources from ecosystems, we ensure the sustainability and resilience of our communities and the planet as a whole. It is crucial for humans to recognize the importance of these ecosystems and work towards their conservation and restoration to ensure the continued availability of these vital resources. So therefore the correct answer is (C) rely on a variety of resources from ecosystems.

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Light moves from a rare to a denser medium at a slower speed and shorter wavelength. As a result, when light enters water from the air, its wavelength is less in water than in air but its frequency remains the same.

The distance between two identical points (adjacent crests) in consecutive cycles of a waveform signal as it moves through space or over a wire is known as its wavelength.

The distance between two wave crests determines the wavelength, but a wave's trough has a constant wavelength. The term "frequency" refers to the number of vibrations that pass over a specific location in a second and is represented in cycles per second (Hz) (Hertz). We discuss how wavelength and frequency are related.

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If 150cm³ of carbon(11) oxide burns in 80cm³of oxygen according to the given equation the volume of oxygen that was in excess is 5.6 cm³.

From the balanced equation, we can see that 2 moles of CO react with 1 mole of O2. Therefore, we need to determine how much O2 is required to react with 150 cm³ of CO.

Let's start by calculating the number of moles of CO:

n(CO) = V(CO) / molar volume at STP

= 150 cm³ / 22.4 L/mol

= 0.006696 mol

Since the stoichiometric ratio of equation of CO to O2 is 2:1, we need half as many moles of O2 as CO. Therefore, the number of moles of O2 required is:

n(O2) = 1/2 * n(CO)

= 1/2 * 0.006696 mol

= 0.003348 mol

Now we can calculate the volume of oxygen required using the ideal gas law:

PV = nRT

Assuming the temperature and pressure are constant, we can simplify this to:

V = n(RT/P)

where V is the volume of gas in liters, n is the number of moles of gas, R is the ideal gas constant, T is the temperature in Kelvin, and P is the pressure in atmospheres.

At STP, the temperature is 273 K and the pressure is 1 atm. Therefore:

V(O2) = n(O2)(RT/P)

= 0.003348 mol * (0.0821 L·atm/mol·K * 273 K / 1 atm)

= 0.0744 L

= 74.4 cm³

So the volume of oxygen required to react with 150 cm³ of CO is 74.4 cm³. Since the initial volume of O2 was 80 cm³, the volume of O2 in excess is:

V(excess) = V(initial) - V(required)

= 80 cm³ - 74.4 cm³

= 5.6 cm³

Therefore, the volume of oxygen that was in excess is 5.6 cm³.

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molar mass of PF5 = 125.966 g/mol

125 g PF5 × (1 mol PF5/125.966 g PF5) = 0.992 mol PF5

0.992 mol PF5 × (6.022 × 10^23 molecules PF5);

= 5.97 × 10^23 molecules PF5

Since there 5 fluorine atoms per molecule of PF5,

(5.97.× 10^23 molecules PF5) × (5 atoms F/1 molecule PF5)

= 2.99 × 10^24 atoms F

Answer:

sorry i can't figure out the exact answer but i think it is 2amu if it is wrong again i'm so sorry

Explanation:

Hydrogen has three isotopes, which include hydrogen, deuterium, and tritium with atomic masses of about 1 amu, 2 amu, and 3 amu. Then the average atomic mass will be 2 amu. Thus option b is correct.

Isotopes are defined as a variation of an element that posses same atomic number but different atomic mass.

Isotopes has nearly same chemical behavior by different physical properties.
It can also be defined as the variant of chemical elements that posses same number of protons and electrons but different number of neutrons.

Radioactive isotopes are used in agriculture, food processing, pest control, archaeology and medicines.

Thus, Hydrogen has three isotopes, which include hydrogen, deuterium, and tritium with atomic masses of about 1 amu, 2 amu, and 3 amu. Then the average atomic mass will be 2 amu. Thus option b is correct.

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Your question is incomplete but probably your fell question was

Hydrogen has three isotopes, which include hydrogen, deuterium, and tritium with atomic masses of about 1 amu, 2 amu, and 3 amu, respectively. Considering the average atomic mass of hydrogen that appears on the Periodic Table, which statement is correct?

a. 1.5 amu

b. 2 amu

c. 3 amu

d. 1.01 amu

Answer:

led

Explanation:

Paint is kind of synthetic chemical product.

Paint is any colored liquid, liquefiable, or solid mastic substance that solidifies after being applied in a thin layer to a substrate.

Pigments, binders, solvents, and additives are the four major components of all paints. Binders work to "bind" the pigments together and create the paint film, while pigments offer color and conceal. Additives are substances that give certain paint features such as mildew resistance, while solvents are liquids that suspend the components and allow you to deposit the paint on the surfaces. All four elements work together to create paint that is tailored to your exact design requirements.

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Answer:

see image

Explanation:

let me know if you have any questions

Answer:

The answer is either A or C figure it out sorry

The answer is A) Something that can be observed or measured while changing the identity of the substance. C) Something that can be observed or measured without changing the identity of the substance.

A physical asset is a function of count that isn't associated with a change in its chemical composition. Familiar examples of bodily homes consist of density, coloration, hardness, melting and boiling factors, and electric conductivity.

Physical homes are those popular properties you word maximum readily approximately a substance, including its length, state of being counted (stable, liquid, or gas), color, mass, density, and power. Values for physical residences can be determined via tests that do not modify the substance being tested.

The definition of bodily is matters which are of nature or of the frame. An example of physical is plantlife developing in the ground. An example of physical is a person constrained to a wheelchair because of disabilities. A bodily exam.

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Answer:

Dalton used creativity to modify Proust's experiment and interpret the results. Millikan used creativity to develop a way to measure the charge on an electron. Thomson used creativity to interpret the results of the cathode ray tube experiment.

Explanation:

Creativity enables scientists to devise new ways of solving old problems.

I do not know what your material contains, however, creativity is key in scientific investigation. The term "science" is coined from the Latin word "scientia" which means knowledge.

In science, we endeavor to create new knowledge through research and innovation. This requires that a scientist must think of new and efficient ways of solving old problems. This underscores the centrality of creativity in scientific investigation.

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Answer: A 0.86 mol sample of a substance is burned in a bomb calorimeter with a heat capacity of 11.23 kJ/C. The temperature increases by 14.93 C. What is ΔHrxn (in kJ/mol) for the combustion of the substance? Note: please record answer to two decimal places regardless of sig figs

Answer: