Vacuum-packaging food is an effective means for stopping the growth of bacteria.
true or false

The molar mass of Ba(ClO4)2 is 336.23 g/mol. The correct option is A.

To calculate the molar mass of Ba(ClO4)2, we need to add the atomic masses of all the elements present in the compound.

Ba(ClO4)2 contains barium (Ba), chlorine (Cl), and oxygen (O).

The atomic mass of barium is 137.33 g/mol.

The atomic mass of chlorine is 35.45 g/mol, but in this compound, it is present as a polyatomic ion (ClO4). The molecular mass of ClO4 is (35.45 + 4x16.00) = 99.45 g/mol.

Since there are two ClO4 ions in the compound, we need to multiply the molecular mass of ClO4 by 2:

2 x 99.45 g/mol = 198.90 g/mol

Now we can add the atomic masses of all the elements:

137.33 g/mol + 198.90 g/mol = 336.23 g/mol

Therefore, the molar mass of Ba(ClO4)2 is 336.23 g/mol, option A.

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Answer:

The temperature will be 189.70 K.

Explanation:

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:  

P*V = n*R*T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.

In this case:

Replacing:

2 atm* 35 L= 4.5 moles* 0.082 \(\frac{atm*L}{mol*K}\) * T

Solving:

\(T=\frac{2 atm* 35 L}{4.5 moles* 0.082\frac{atm*L}{mol*K} }\)

T= 189.70 K

The temperature will be 189.70 K.

Answer:

Multiply the length, width, and height together.

( length *, width *, height )

The answer to this is multiplication problem is the volume of the object.

Explanation:

- Do not measure the height of the entire container, just the height from one watermark to another.

I hope this helped!

Answer:

Precise, but not accurate

Explanation:

First, let’s define accuracy and precision.

⇒Accuracy: how close you are to the actual value

⇒Precision: how close the measurements are to each other.

Let’s examine the data given:  

12.13 g, 12.12 g, 12.13 g, and 12.11 g

Each number is or is very close to 12.12 (within 0.1)

The actual mass of the object is 17.13 grams. Each measurement is about 5 grams away from the actual mass.

Since the measurements are very close to each other, but quite far from the true value, we can say the results are precise, but not accurate.

Answer:

The total number of molecules remains the same

Answer:

0.086

Explanation:

got it on acellus

The mass of the dry solute recovered from the given data is 0.086 g.  Option C

To determine the mass of the dry solute recovered, we need to subtract the mass of the boat from the mass of the boat with the dry solute.

Given the data provided:

Boat Mass: 0.730 g

Boat + Solution: 0.929 g

Boat + Dry: 0.816 g

To find the mass of the dry solute, we subtract the boat mass from the boat + dry mass:

Mass of Dry Solute = (Boat + Dry) - (Boat Mass)

Mass of Dry Solute = 0.816 g - 0.730 g

Mass of Dry Solute = 0.086 g

Therefore, the correct answer is c) 0.086 g.

The mass of the dry solute recovered from the given data is 0.086 g. It is important to note that the mass of the dry solute is obtained by subtracting the mass of the boat from the mass of the boat with the dry solute, as the boat mass represents the weight of the empty boat or container used in the experiment.

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The formula for a compound made from x2 and y- can be predicted using the crisscross method.

X2 has a charge of 2+ while y- has a charge of 1-. To form a neutral compound, the charges must balance each other.

To do this, the charge of x2 will become the subscript of y, and the charge of y- will become the subscript of x2.

Thus, the formula for the compound will be written as X2Y.

This indicates that two atoms of x combine with one atom of y to form the compound.

The compound may have different properties and characteristics depending on the identity of the elements X and Y.

Overall, the crisscross method is an effective way to predict the formula of an ionic compound.

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The synthesis of silver nanoparticles can involve various methods and conditions, but a general order of steps in a typical synthesis process might be as follows:

Preparation of the silver precursor: Silver nitrate (AgNO3) is commonly used as a silver precursor. It is dissolved in water or other suitable solvents to prepare a silver precursor solution.

Preparation of the reducing agent: A reducing agent, such as sodium borohydride (NaBH4) or sodium citrate, is prepared separately. The reducing agent will react with the silver precursor to form silver nanoparticles.

Mixing the silver precursor and reducing agent: The silver precursor solution and the reducing agent solution are mixed together under suitable conditions, such as controlled temperature and stirring, to allow the reduction reaction to occur.

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Answer:

Number 6 is correct all substances are made of molecules.

Explanation:

A molecule is a formation of atoms or a chemical and all substances are made of chemicals.

The given statement all known substances are made of molecules is correct. Therefore, option (d) is correct.

All known compounds in chemistry are made up of different kinds of molecules. A compound contains atoms or ions of two or more elements in fixed proportions joined with each other by bonds into a molecule. Molecules are formed when atoms are joined through chemical bonds.

Any molecule that contains atoms of two or more different elements is known as a compound. All the compounds are written into formulas that present the chemical elements from the periodic table combined.

When the atoms of a particular element combine, some individual property of that chemical element is lost. The newly formed compound shows some new properties.

All the compounds or known substances have a chemical formula. These compounds can be divided into two kinds, molecular compounds, and salts.

Some examples of substances made of molecules such as water have molecules of H₂O, hydrogen peroxide H₂O₂, etc.

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Answer:

Hope this will help you

Answer:

Methane = Production and transport of oil and natural gas

Fluorinated gases = Industrial processes

Nitrous Oxide = Agricultural and industrial activities

Carbon Dioxide = Burning fossil fuels

*You don't have to believe me but...you might get this question wrong if you don't believe me. <3

The pressure of carbon dioxide is needed to dissolve 100.0 mg of carbon dioxide in 1.00 L of water option (a) 0.0649 atm.

We can solve this problem using Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. Mathematically, this can be expressed as:

C = k * P

where C is the concentration of the gas in the liquid, P is the partial pressure of the gas above the liquid, and k is the proportionality constant known as Henry's Law constant.

To find the partial pressure of carbon dioxide needed to dissolve 100.0 mg of carbon dioxide in 1.00 L of water, we first need to convert the mass of carbon dioxide to moles:

100.0 mg / (44.01 g/mol) = 0.00227 mol

The concentration of carbon dioxide in the water is then:

C = 0.00227 mol / 1.00 L = 0.00227 M

The  pressure of carbon dioxide is needed to dissolve 100.0 mg of carbon dioxide in 1.00 L of water is

Next, we can use Henry's Law to find the partial pressure of carbon dioxide:

P = C / k

The Henry's Law constant for carbon dioxide in water at 25 degrees C is 3.4 x \(10^{(-2)\)M/atm.

P = (0.00227 M) / (3.4 x \(10^{(-2)\) M/atm) = 0.0668 atm

Therefore, the answer is closest to option (a) 0.0649 atm.

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\({ \red{ \underline{ \tt{Langmuir \: adsorption \: isotherm:}}}}\)

The defect of Freundlich adsorption isotherm is that it fails at high pressure of the gas.

Langmuir derived the adsorption isotherm based on the theoretical considerations. It is generally applied to chemical adsorption.

It can be expressed as

\({ \blue{ \bold{ \frac{X}{m} = \frac{AP}{1+BP}}}}\)

where,

X = mass of the gas adsorbed

M = mass of the adsorbent

P = equilibrium pressure

Answer:

the day where the daylight and night are equal in the Spring

Answer:

Genome

Explanation:

Nuclear magnetic resonance spectroscopy (NMR) is used to study the electronic environment of atoms and the bonding nature of a compound.

The number of different signals observed in the 1H NMR spectra of the given compounds are as follows: Compound A: 10 signals, Compound B: 6 signals ,Compound C: 4 signals Compound D: 6 signals ,Compound E: 9 signals, Compound F: 3 signals

In proton nuclear magnetic resonance spectroscopy (1H NMR), the magnetic field strength and electronic environment of the protons influence the chemical shifts. The shielding effect or deshielding effect of the nearby atoms, bond length, and bond angle, among other factors, all influence the chemical shifts. There are five different types of proton environments, which correspond to five different chemical shifts, in this case: Type 1: Hydrogen atoms that are covalently bonded to sp3 hybridized carbons. Type 2: Hydrogen atoms that are covalently bonded to sp2 hybridized carbons. Type 3: Hydrogen atoms that are covalently bonded to sp hybridized carbons. Type 4: Hydrogen atoms that are covalently bonded to aromatic carbons. Type 5: Hydrogen atoms that are directly bonded to electronegative elements such as nitrogen, oxygen, or halogens.

Here, to determine the number of signals expected in the 1H NMR of the compounds. Compound A: 10 different proton environments => 10 signals. Compound B: 6 different proton environments => 6 signals. Compound C: 4 different proton environments => 4 signals. Compound D: 6 different proton environments => 6 signals. Compound E: 9 different proton environments => 9 signals. Compound F: 3 different proton environments => 3 signals.

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The rate at which hydrogen bonds break in water rises as it warms, causing water molecules to become gaseous.

Because of the larger kinetic energy of the water molecules when the heat is increased (as occurs when water boils, for example), the hydrogen bonds entirely dissolve and the water molecules are free to escape as gas into the atmosphere. We can see this gas as steam or water vapour.

As water is heated, the water molecules spread out more and travel more quickly. Hot water is less thick than water at ambient temperature as a result.

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Answer:

the phenotype of the offspring will be pink

The percentage change in H2S on the original scale corresponding to an additive increase of 0.01 on the (natural) log scale is (exp(0.01) - 1) * 100.

To calculate the percentage change in H2S on the original scale corresponding to an additive increase of 0.01 on the (natural) log scale, you can follow these steps:

1. Identify the additive increase on the log scale, which is 0.01.
2. Convert this additive increase back to the original scale by taking the exponential function: exp(0.01).
3. The result from step 2 represents the multiplicative increase on the original scale. Subtract 1 from this value to get the proportional change: exp(0.01) - 1.
4. Multiply the result from step 3 by 100 to convert the proportional change to a percentage change.

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Answer: from the cells that are fed by the food

Explanation:

After benzocaine is mixed with hydrochloric acid, it will be 4-aminobenzoic acid and soluble in the water.

Benzocaine, sold beneath the counter emblem called Orajel amongst over-the-counters, is an ester nearby ones over the counter normally used as a topical ache reliever or in cough drops. it's a far over-the-counter lively factor in many ones over counter ointments consisting of merchandise for oral ulcers.

Benzocaine is used to relieve aches and itching resulting from conditions that include sunburn or different minor burns, insect bites or stings, poison ivy, poison oak, poison sumac, minor cuts, or scratches.

Benzocaine is a local over-the-counter used in pain manage management, and it's far over-the-counter ester neighborhood ones over-the-counter elegance of medication. This pastime describes over-the-counter symptoms, actions, and contraindications for benzocaine as a valuable agent in coping with ache control.

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Valine would be expected to have a 1 charge at a pH below its isoelectric point.

The isoelectric point (pI) of an amino acid is the pH at which it carries no net electrical charge. Above the pI, the amino acid tends to carry a negative charge, while below the pI, it tends to carry a positive charge.

Valine, like other amino acids, has a unique pI. The specific pI of valine depends on its side chain and the surrounding environment. However, since the question does not provide the pI of valine, we cannot determine the exact pH at which valine would have a 1 charge.

Nevertheless, based on the given information that the pH of valine is 6.0, we can infer that the pH of 6.0 is likely below the pI of valine. This is because at pH 6.0, valine would still carry a net positive charge (1 charge) due to the excess of protons (H+) in the solution. At the pI or a pH higher than the pI, valine would have a net negative charge.

To determine the precise pH at which valine would have a 1 charge, the pI value of valine would be required.

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The pH of the solution after adding 5.00 mL of 0.440 M NaOH is approximately 13.644.

To calculate the pH of the solution after adding 5.00 mL of 0.440 M NaOH to the solution in the Erlenmeyer Flask, we need to understand the reaction that occurs between NaOH and HC2H302 (acetic acid). NaOH is a strong base, while HC2H302 is a weak acid.

Step 1: Calculate the moles of HC2H302 initially present.
To do this, we multiply the volume of HC2H302 solution (20.00 mL) by its molarity (0.250 M). This gives us 0.00500 moles of HC2H302.

Step 2: Calculate the moles of NaOH added.
To do this, we multiply the volume of NaOH solution added (5.00 mL) by its molarity (0.440 M). This gives us 0.00220 moles of NaOH.

Step 3: Determine the limiting reactant.
Since NaOH is a strong base and HC2H302 is a weak acid, the reaction between them will go to completion. Therefore, the limiting reactant is the one that is completely consumed, which in this case is HC2H302.

Step 4: Calculate the moles of HC2H302 remaining.
Since HC2H302 is the limiting reactant, the moles of HC2H302 remaining will be the initial moles minus the moles of NaOH added. In this case, it will be 0.00500 moles - 0.00220 moles = 0.00280 moles.

Step 5: Calculate the concentration of HC2H302 in the final solution.
To do this, we divide the moles of HC2H302 remaining by the total volume of the solution, which is the sum of the initial volume of HC2H302 solution (20.00 mL) and the volume of NaOH solution added (5.00 mL). This gives us 0.00280 moles / 25.00 mL = 0.112 M.

Step 6: Calculate the pOH of the solution.
To do this, we take the negative logarithm (base 10) of the concentration of hydroxide ions (OH-) in the solution. Since NaOH is a strong base, it completely dissociates in water, giving us 0.00220 moles of OH- in 5.00 mL of solution. Converting this to a concentration gives us 0.00220 moles / 0.00500 L = 0.440 M. Taking the negative logarithm gives us the pOH: pOH = -log(0.440) = 0.356.

Step 7: Calculate the pH of the solution.
Since pH + pOH = 14, we can calculate the pH by subtracting the pOH from 14: pH = 14 - 0.356 = 13.644.

Therefore, the pH of the solution after adding 5.00 mL of 0.440 M NaOH is approximately 13.644.

Overall, it is important to note that this calculation assumes that the volumes of the solutions are additive, and that the final solution is diluted. It also assumes that the pKa of acetic acid is negligible compared to the concentration of OH- added.

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The pair of elements that will form an ionic compound are magnesium and oxygen. Ionic compounds are formed when one element donates electrons to another element. In this case, magnesium donates two electrons to oxygen, resulting in the formation of magnesium oxide (MgO).

The transfer of electrons from magnesium to oxygen creates ions with opposite charges - magnesium becomes a positively charged ion (cation) and oxygen becomes a negatively charged ion (anion). This type of bond is characterized by the strong electrostatic forces between the ions.

Other examples of ionic compounds include sodium chloride (NaCl) and potassium iodide (KI). In these compounds, sodium, potassium, and iodine also donate electrons to chlorine and iodine atoms respectively.

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Answer:

-371 degrees f

Explanation:

-371 degrees F.

speeds on Uranus range from 90 to 360 mph and the planet's average temperature is a frigid -353 degrees F. The coldest temperature found in Uranus' lower atmosphere so far is -371 degrees F., which rivals Neptune's frigid temperatures.

(hope this helps can i plz have brainlist :D hehe)

The study of substances that contain carbon and its compounds is called the study of organic chemistry.

Organic chemistry is the study and examination of the composition, reactions, and practices of molecules containing carbon. The majority of natural compounds are composed of carbon and hydrogen, but they also include a wide range of other elements (such as nitrogen, oxygen, halogens, phosphorus, silicon, and sulfur) in all of their compounds. A hydrocarbon is a naturally occurring compound that contains carbon, hydrogen, and is found in substances like crude oil, natural gas, and coal. The world's primary source of electricity and particularly flammable are hydrocarbons. Gasoline, jet fuel, propane, kerosene, and diesel are just a few examples of the fuels it can be used with.

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The correct values for a 4f sublevel are rᵢ = 2, l = ml = 2. The answer is D)

The 4f sublevel is a type of atomic orbital that is found in atoms with atomic numbers ranging from 58 (cerium) to 71 (lutetium). This sublevel is characterized by having n = 4 (the principal quantum number), l = 3 (the azimuthal quantum number), and ml = -3, -2, -1, 0, 1, 2, or 3 (the magnetic quantum number).

Option A) has n = 4 and l = 3, which are correct for a 4f sublevel, but it has mₓ = -2, which is not a possible value for ml in a 4f sublevel.

Option B) has n - 2 = 2, which is not correct for a 4f sublevel, and l = 1, which is not correct either. Additionally, it has ml = 0, which is not a possible value for ml in a 4f sublevel.

Option C) has h = 1, which is not a quantum number used to describe atomic orbitals, and l = ml = 0, which are not correct values for a 4f sublevel.

Option D) has rᵢ = 2, which is correct for n = 4, and l = ml = 2, which are correct values for a 4f sublevel. Therefore, option D is the correct answer.

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Answer:

I think 1 option ok basically I am a scientist

Answer:

(3)

Explanation: