Which are nutrition components that must appear on the nutrition facts food label?

Answer:

???????

Explanation:

In a 50 mM Phosphate buffer solution at a pH of 4.5, the phosphate molecules are expected to exist in their ionized forms, primarily as dihydrogen phosphate ions (H\(_{2}\)PO\(_{4}\)-) and hydrogen phosphate ions (HPO\(_{42}\)-).

At a pH of 4.5, the solution is slightly acidic. In an acidic environment, the phosphate buffer system maintains its pH by the equilibrium between the dihydrogen phosphate and hydrogen phosphate species. The dihydrogen phosphate ion acts as a weak acid, donating a proton (H+) to water to form a hydronium ion (H\(_{3}\)O+). This reaction can be represented as follows:

H\(_{2}\)PO\(_{4}\)-- + H\(_{2}\)O ↔ H\(_{3}\)O+ + HPO\(_{42}\)-

The hydrogen phosphate ion acts as a weak base, accepting a proton from water to form hydroxide ions (OH-). This reaction can be represented as follows:

HPO\(_{42}\)- + H\(_{2}\)O ↔ OH- + H\(_{2}\)PO-

The equilibrium between these two species allows the phosphate buffer system to resist changes in pH when small amounts of acid or base are added to the solution.

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The presence of salt in the fish can attract the mouse due to the sodium content. Additionally, the moisture on the fish allows for the conduction of electricity.

When the mouse touches the metal plates or wires of an electric mouse trap, completing the circuit, an electrical current passes through its body, leading to its immobilization or death.

The process behind a mouse getting trapped on a mouse trap involves some basic chemistry principles. When a piece of salted fish, such as "Koobi," is placed on a mouse trap, the following chemical interactions occur.

Salt, which is typically present in salted fish, contains sodium chloride (NaCl). Sodium chloride is an ionic compound consisting of positively charged sodium ions (Na+) and negatively charged chloride ions (Cl-). Salt serves two main purposes in this context.

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Answer:

The water molecule is comprised of two hydrogen (H) atoms and one oxygen atom,  oxygen atom has 8 electrons, and each H has 1 electron. The H atoms bond to the oxygen by sharing a pair of electrons in what is called a covalent bond. In each pair of shared electrons, one electron is contributed by the H (black) and one from the oxygen (red).

Explanation:

have a great day and please mark brainliest

They are all formed from ancient organic material that was buried under many layers of sediment and not allowed to decay.

What are organic materials?

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A chemical formula is a group of chemical symbols and numbers that express the elements and the number of atoms of each element that compose a compound.

A chemical formula of a compound offers information about the proportions of each chemical element in a given chemical compound or molecule.

The chemical formula of a compound can be written by including the chemical symbols of elements, numbers as subscripts, and symbols, such as plus (+) and minus (−) signs, dashes, commas, and brackets.

A chemical formula exhibits no words but simple chemical structures can be drawn but not full structures. Chemical formulae must be limited in power rather than chemical structural formulae.

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the pressure of the gas increases

Answer:

The number of collisions of gas particles increases.

Explanation:

Just took the test!!!

Answer:

dgdgdf

Explanation:

and yeah thatds it

decay rate of approximately 1.69x10^17 Bq (becquerels),

The decay rate of a radioactive sample is determined by the number  of radioactive atoms present and the decay constant, which represents the probability of decay per unit of time.

To calculate the decay rate, we multiply the number of atoms in the sample by the decay constant. In this case, the sample has 8.31x10^17 atoms and a decay constant of 0.203/s. Multiplying these values gives a decay rate of approximately 1.69x10^17 Bq (becquerels), which represents the number of decays per second in the sample.

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In this case, a water sample has been diluted to 10^-3, which means it has been diluted by a factor of 1,000 times. So, the correct answer is:

The answer is option b. 300.

When a solution is diluted, it means that more solvent (usually water) has been added to decrease the concentration of the solute. The dilution factor is the ratio of the final volume of the solution to the initial volume of the solution.

In this case, the water sample has been diluted to 10-3, which means that the concentration of the original solution has been reduced by a factor of 10-3.

To calculate the dilution factor, we need to take the reciprocal of the concentration reduction factor:

Dilution factor = 1/10-3 = 1,000

So the water sample has been diluted by a factor of 1,000 times.

Therefore, the correct answer is option b. 300 is not the dilution factor, but rather the concentration reduction factor (1/300), which is the reciprocal of the dilution factor.

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In solution 4 of part b, both the hydronium concentration and hydroxide concentration are 1 M due to the neutralization reaction between HCl and NaOH. The initial concentrations of H₃O⁺ and OH⁻ were 0.1 M, but they reacted to form water and resulted in equal final concentrations of 1 M for both ions.

To calculate the hydronium and hydroxide concentrations for solution 4 in part b, we need to first understand the equation for the reaction that occurred.

The equation given is: HCl + NaOH -> NaCl + H₂O

This tells us that one mole of HCl reacts with one mole of NaOH to produce one mole of NaCl and one mole of water.

Based on this equation, we know that the initial concentration of hydroxide ions (OH-) in solution 4 is equal to the initial concentration of sodium hydroxide (NaOH), which was given as 0.1 M.

Next, we need to determine the concentration of hydronium ions (H₃O⁺). Since HCl is a strong acid, it completely dissociates in water to produce H₃O⁺ and Cl⁻ ions. Therefore, we can assume that the initial concentration of H₃O⁺ is equal to the initial concentration of HCl, which was also given as 0.1 M.

Now, let's consider what happens when the HCl and NaOH are mixed together. They react to form NaCl and water, which means that the concentrations of H₃O⁺ and OH⁻ will change.

From the equation, we can see that the reaction consumes one mole of HCl and one mole of NaOH. This means that the final concentration of HCl and NaOH will both be zero.

To determine the final concentration of OH-, we need to use the fact that the reaction produces one mole of water for every mole of NaOH that reacts. Therefore, the final concentration of OH⁻ will be equal to the initial concentration of NaOH (0.1 M) divided by the volume of the solution.

If we assume that the volume of the solution is 100 mL (as stated in the question), then the final concentration of OH- will be:

[OH⁻] = 0.1 M / 0.1 L = 1 M

Finally, we can use the fact that the concentration of H₃O⁺ and OH⁻ must be equal in a neutral solution to determine the final concentration of H₃O⁺.

Since the final concentration of OH⁻ is 1 M, we know that the final concentration of H₃O⁺ must also be 1 M.

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The cell notation for the electrochemical cell described above is:

Zn (s) | Zn2+ (aq) || Cr3+ (aq) | Cr2+ (aq) | Pt (s)

The double vertical lines represent the salt bridge separating the two half-cells, and the single vertical lines represent the phase boundary between the electrode and the solution.

The anode half-reaction involves the oxidation of solid zinc (Zn) to aqueous zinc ions (Zn2+): Zn (s) → Zn2+ (aq) + 2 e-

This reaction occurs at the left-hand side of the cell, represented by the symbol Zn (s).

The cathode half-reaction involves the reduction of aqueous chromium (III) ions (Cr3+) to aqueous chromium (II) ions (Cr2+):  Cr3+ (aq) + e- → Cr2+ (aq)

This reaction occurs at the right-hand side of the cell, represented by the symbol Pt (s), which denotes a platinum electrode.

The cell notation is written by listing the anode half-reaction on the left-hand side of the vertical line, and the cathode half-reaction on the right-hand side. The solid electrode material is listed first, followed by the species in solution. The symbols "||" denote the salt bridge that separates the two half-cells.

The concentrations of the aqueous solutions and the pressure of gases are assumed to be 1 mol/L and 1 bar, respectively.

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b) Balanced net ionic equation: \(2 H+(aq) + 2 Br-(aq) + Mg(s) → Mg2+(aq) + 2 Br-(aq) + H2(g)\)  c) Balanced chemical equation: \(2 HBr(aq) + Mg(s) → MgBr2(aq) + H2(g) d)\) Balanced net ionic equation: \(2 H+(aq) + 2 Br-(aq) + Mg(s) → Mg2+(aq) + 2 Br-(aq) + H2(g)\)

e) Balanced chemical equation: \(2 CH3COOH(aq) + Zn(s) → (CH3COO)2Zn(aq) + H2(g\) ) f) Balanced net ionic equation: 2 CH3COOH(aq) + Zn(s) → (CH3COO)2Zn(aq) + H2(g)\(2 CH3COOH(aq) + Zn(s) → (CH3COO)2Zn(aq) + H2(g)\) In chemical equations, the reactants are written on the left side, and the products are written on the right side. The coefficients represent the stoichiometric ratios, indicating the number of molecules or moles involved. a) In the reaction between hydrobromic acid (HBr) and magnesium (Mg), two moles of HBr react with one mole of Mg to produce one mole of magnesium bromide (MgBr2) and one mole of hydrogen gas (H2). The phases in the equation are indicated as (aq) for aqueous (dissolved in water) and (s) for solid.

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Answer:

Answer: 93.54%Explanation: Divide the mass of the zinc by the total mass of the penny. 2.9/3.1=0.9354To get to a percent, multiply by 100.

Explanation:

93.54% of zinc in the penny when a penny has a total mass of 3.1 grams and zinc makes up 2.9 g of the penny.

What is mass?

Mass is simply the measure of the amount of matter in a body.

Divide the mass of the zinc by the total mass of the penny.

=0.9354

To get to a percent, multiply by 100.

0.9354 x 100 = 93.54

Thus, the mass of the zinc in the penny is 93.54%.

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Lewis dot structure of PF3 contains 1 lone pair on the central atom(phosphorous) and 3 lone pairs on each outer atom(fluorine).

The diagrams known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.

The trigonal pyramid is the form or molecular geometry of PF3. Since PF3's core region comprises four zones of electron density, its electron geometry is tetrahedral. One lone pair is present on the core atom (phosphorus) in the Lewis dot structure of PF3, and three are present on each outside atom (fluorine).

See the reference image below:

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Answer:

its b because when the lava comes out it would run against the sides and since b is on the side it would run onto b

Explanation:

Answer:

Empirical formula is CH₃Cl.

Explanation:

Given data:

Percentage of hydrogen = 6%

Percentage of carbon = 24%

Percentage of chlorine= 70%

Empirical formula = ?

Solution:

Number of gram atoms of H = 6/ 1 = 6

Number of gram atoms of C = 24 /12=  2

Number of gram atoms of Cl = 70/ 35.45 = 2

Atomic ratio:

            C                      :      H            :         Cl

           2/2                    :     6/2           :       2/2

            1                       :        3          :        1

C : H : Cl = 1 : 3 : 1

Empirical formula is CH₃Cl.

Answer:

CH3Cl

Explanation:

a-p-e-x

Answer:

I'd say about 8?

Explanation:

if you wanna make them huge make about 6

Sodium (Na) atoms lose one electron to become a positively charged ion,

Chlorine (Cl) atoms gain one electron to become a negatively charged ion, Cl-.

Sodium, with an atomic number of 11, has 11 protons and 11 electrons in its neutral state. When sodium loses one electron, it now has one more proton (11) than electrons (10), resulting in an overall positive charge. The positive charge is equal to the number of protons, so a sodium ion (Na+) has a +1 charge.

Chlorine, with an atomic number of 17, has 17 protons and 17 electrons in its neutral state. When chlorine gains one electron, it now has one more electron (18) than protons (17), resulting in an overall negative charge. The negative charge is equal to the number of extra electrons, so a chloride ion (Cl-) has a -1 charge.

The charges of these ions are based on the principle of achieving a stable electron configuration. Sodium wants to achieve a stable configuration similar to the noble gas neon (Ne), which has a full outer electron shell with 8 electrons. By losing one electron, sodium attains a stable configuration like neon. Chlorine wants to achieve a stable configuration similar to the noble gas argon (Ar), which has a full outer electron shell with 8 electrons. By gaining one electron, chlorine attains a stable configuration like argon. This electron transfer allows both sodium and chlorine to achieve a more stable state, resulting in the formation of positively and negatively charged ions.

Therefore,Sodium (Na) atoms lose one electron to become a positively charged ion,

Chlorine (Cl) atoms gain one electron to become a negatively charged ion, Cl-.

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Answer:

H ( I think , I can't understand the given answers but I hope my explanation helps) ^^

Explanation:

Tectonic plate movement under the Earth can create landforms by pushing up mountains and hills. Erosion by water and wind can wear down land and create landforms like valleys and canyons. Both processes happen over a long period of time, sometimes millions of years.

Answer:

D

Explanation:

When an atom loses an electron the number of electrons exceeds the number of protons. This means that the negative charge induced by the electrons exceeds the positive charge induced by the protons.

If a regulatory molecule is nonpolar, the receptor protein would most likely be found is within the cytoplasm or nucleus of the cell.

A molecule is the smallest fundamental unit of a chemical compound that retains the chemical properties and characteristics of that compound. It consists of two or more atoms held together by chemical bonds. Atoms within a molecule can be of the same element or different elements, and their arrangement determines the molecule's unique properties.

Molecules can be simple, such as oxygen (\(O_2\)), which consists of two oxygen atoms, or complex, such as DNA, which is made up of a sequence of nucleotide molecules. Molecules play a crucial role in various aspects of life and the physical world. They participate in chemical reactions, form the basis of compounds and substances, and are responsible for the structure, function, and interactions of biological systems.

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Answer:

174.4 g of oxygen gas required

Explanation:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

In a chemical reaction, the products and reactants always remain in stoichiometric ratios, and therefore:

C₃H₈ : 5O₂ : 3CO₂ : 4H₂O = 1 : 5 : 3 : 4

Therefore, we need 5 moles of O₂ gas to react with 1 mole of C₃H₈.

To calculate number of moles (n), we can divide mass in grams (m) by molar mass (g/mol). Molar mass (MM) is found on a standard IUPAC Periodic Table.

n(C₃H₈) = m/MM = 48.05/(12.01×3+1.008×8) = 1.089717 mol

Now, using our stoichiometric ratios, 1 : 5, n(O₂) = 5×n(C₃H₈).

∴n(O₂) = 5×1.089717 = 5.448587 mol

To find the mas required, we can rearrange the above formula from before that we used to calculate the number of moles of C₃H₈. i.e, multiply moles by molar mass to get mass present.

m(O₂) = n×MM = 5.448587×(16.00×2) = 174.4 g

The height of a column of water when the applied pressure on the other arm of a J tube sealed at one end is 2665.1 hPa is approximately 2.72 meters.

To calculate the height of the column of water, we use the following formula:

h = (P - Patm)/(ρg)

where h is the height of the column of water, P is the applied pressure, Patm is the atmospheric pressure, ρ is the density of water, and g is the acceleration due to gravity.

First, we need to convert the given pressure of 2665.1 hPa to Pascals (Pa):

2665.1 hPa × 100 Pa/hPa = 266,510 Pa

We can assume that the atmospheric pressure at sea level is approximately 101,325 Pa. Substituting the values into the formula, we get:

h = (266,510 - 101,325)/(0.998 g/cm³ × 9.80665 m/s²) ≈ 2.72 meters

Therefore, the height of the column of water in the J tube is approximately 2.72 meters.

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There are numerous ways that fossils can form, but the majority occur when a living thing—such as a plant or animal—dies and is swiftly buried by sediment—such as mud, sand, or volcanic ash and rock.

Thus, Only the hard bones or shells are left behind when soft tissues degrade, yet in some cases an organism's soft tissues can be retained and animals.

More sediment, volcanic ash, or lava may accumulate over the organism after it has been buried, and eventually all the layers harden into rock.

These once-living organisms are only revealed to us from within the stones when the process of erosion takes place, when the rocks are worn back down and washed away and fossil.

Thus, There are numerous ways that fossils can form, but the majority occur when a living thing—such as a plant or animal—dies and is swiftly buried by sediment—such as mud, sand, or volcanic ash and rock.

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Answer: they are the same because they both convert and deal with thermal energy because it’s not created or destroyed

Explanation:

1. The number of mole in 0.293 Kg of Pb is 1.42 mole

2. The number of atom in 0.293 Kg of Pb is 8.55×10²³ atoms

1. How to determine the number of mole

The numbe of mole in the 0.293 Kg of Pb can be obtained as follow:

Mole = mass / molar mass

Number of mole of = 293 / 207

Number of mole = 1.42 mole

Thus, the number of mole is 1.42 mole

2. How to determine the number of atoms

The number of atoms can be obtained as follow:

From Avogadro's hypothesis,

1 mole of Pb = 6.02×10²³ atoms

Therefore,

1.42 mole of Pb = (1.42 mole × 6.02×10²³ atoms) / 1 mole

1.42 mole of Pb = 8.55×10²³ atoms

Thus, the number of atoms is 8.55×10²³ atoms

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Answer:

is you'r question correctly?

or not

The amount of the original sample remaining would be between 1.50 and 3.00 grams. Option I.

To solve this problem, we can use the half-life formula:

N = N0 x (1/2)^(t/T)

where:

We are given N0 = 12.0 grams, T = 3.6 days, and t = 10 days. We can plug these values into the formula and solve for N:

N = 12.0 grams x (1/2)^(10/3.6)

N ≈ 1.50 grams

Therefore, about 1.50 grams of the original sample remains after 10 days. The answer is between 1.50 and 3.00 grams.

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