what is the amount of iron present in 18.5 g of cereal when the recommended serving size is 30 g? the dri of iron is 18 mg/day. select one:A. 11.10 mgB. 18.0 g C. 1.10 gD 18.0 mg

Answer:

Multicellular organisms have cells that are organized in specific ways to perform specialized functions. From the most complex level to the simplest level, the five levels of organization for the sheep should be ordered as:

whole organism → organ system → organ → tissue→ cell

Explanation:

The strongest lattice KF

What is an lattice energy?

Lattice energy is the energy difference between the measured value of the ionic solid's energy and the expected experimental value. The energy difference between the energy of the ionic solid and the energy of the individual gaseous ions is what this is, more specifically.

What is an compound?

Compounds are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio

highest lattice --> small metal ion, small halide

so there is a strong ionic figure, i.e. ionic = very metal +very nonmetal

note that Fluorine is pretty electrongative

so choose F

then, since K is the same for all

the strongest lattice if KF

Therefore, option(D) is correct

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Answer:

Blood is liquid and red, just like a red river. And for humans without blood there is no life because there is nothing to transport nutrients and oxygen to the body cells. Hence blood is the red river of life.

Answer:

i think its because of how the blood is one of the main reasons we are alive today. And without it we'd die

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:

potential energy

Explanation:

Energy, potential energy, is stored in the covalent bonds holding atoms together in the form of molecules. This is often called chemical energy.

10 g of NaF was placed in water such that the final volume was 125 ml.  8.57 is the pH of the solution.

pH is a numerical indicator of how acidic or basic aqueous or other liquid solutions are. The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 1014 gram-equivalents per litre, into numbers between 0 and 14. The hydrogen ion concentration in pure water, which has a pH of 7, is 107 gram-equivalents per litre, making it neutral. A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.

NaF + H\(_2\)O ⇄ NaOH + HF

moles of NaF = 10 g / 41.99 g/mol

                       = 0.238 mol

[NaF]  = 0.238 mol / 0.125 L

          = 1.904 M

[\(Na^+\)] = 1.904 - x

[\(OH^-\)] = x

[HF] = x

[\(F^-\)] = 1.904 - x

Kb = [HF][\(OH^-\)] / [\(F^-\)]

x×x / (1.904 - x) = Kb

Ka = [\(H^+\)][\(F^-\)] / [HF]

    = 7.2 x 10⁻⁴

Ka x Kb = Kw

           = 1.0 x 10^⁻¹⁴

Kb = Kw / Ka

    = 1.0 x 10⁻¹⁴ / 7.2 x 10⁻⁴

    = 1.4 x 10⁻¹¹

x.x / (1.904 - x) = 1.4 x 10⁻¹¹

x = 3.7 x 10⁻⁶ M

pOH = -log[OH-]

        = -log(3.7 x 10⁻⁶)

        = 5.43

pH = 14 - pOH

     = 14 - 5.43

     = 8.57

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The correct coefficients for the chemical reaction between hydrazine and hydrogen peroxide is 1, 2, 1, 4 (option B).

Coefficients in a chemical reaction are numbers placed in front of formulas to balance equations.

A chemical equation is balanced when the number of atoms of each element on both sides of the equation are the same.

According to this question, hydrazine reacts with hydrogen peroxide to form nitrogen gas and water as follows:

N₂H₄ + 2H₂O₂ → N₂ + 4H₂O

As observed in the above chemical equation, the correct coefficients for the chemical reaction from left to right is 1, 2, 1, 4.

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When a stock solution is diluted, the number of moles of solute (NaNO3 in this case) remains constant. Therefore, we can use the following equation to find the final molarity of the diluted solution:

M1V1 = M2V2

where M1 is the initial molarity (0.275 M), V1 is the initial volume (15.00 mL), M2 is the final molarity (what we want to find), and V2 is the final volume (100.0 mL).

First, we need to convert the initial volume from milliliters to liters:

V1 = 15.00 mL = 0.01500 L

Next, we can substitute the given values into the equation:

(0.275 M) × (0.01500 L) = M2 × (0.1000 L)

Solving for M2, we get:

M2 = (0.275 M × 0.01500 L) ÷ 0.1000 L

M2 = 0.04125 M

Therefore, the final molarity of the NaNO3 solution is 0.04125 M.

The use of a specialized mixture of gases for breathing, an apparatus for the delivery of the gases,, This is an example of behavioral adjustment .

The use of a specialized mixture of gases for breathing apparatus for the delivery of the gases, protective clothing, and gear to increase visibility for underwater diving is an example of the behavioral adjustment. T he behavioral adjustment is the individuals quality to adjust one's  behavior to environment. this above example is the example of the behavioral adjustment.

the behavioral adjustment is the adjustment such as adopting the sleeping postures, walk at all times, use manners,  become a good listener and allow other to learn, gives respect to other, keep a space neat and clean.

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1. To determine the number of moles of NaClO₃ required to produce 61 moles of O₂, we can use the stoichiometric ratio between NaClO₃ and O₂.

From the balanced chemical equation, we see that 2 moles of NaClO₃ produce 3 moles of O₂. Therefore, we can set up the following proportion:

2 moles NaClO₃ / 3 moles O₂ = x moles NaClO₃ / 61 moles O₂

Solving for x, we get:

x = (2/3) × (61 moles O₂) / (1 mole NaClO₃) ≈ 41 moles NaClO₃

Therefore, approximately 41 moles of NaClO₃ are needed to produce 61 moles of O₂.

2. From the balanced chemical equation, we see that 3 moles of Cu react with 8 moles of HNO₃ to produce 2 moles of NO. Therefore, we can set up the following proportion:

3 moles Cu / 8 moles HNO₃ = 2 moles NO / x moles HNO₃

Solving for x, we get:

x = (8/3) × (2 moles NO) / (1 mole Cu) ≈ 5.3 moles HNO₃

Therefore, 5.3 moles of HNO₃ are needed to produce 2 moles of NO. If 26 moles of HNO₃ are consumed, we can calculate the moles of NO produced using a proportion:

3. 5.3 moles HNO₃ / 2 moles NO = 26 moles HNO₃ / y moles NO

Solving for y, we get:

y = (2/5.3) × (26 moles HNO₃) / (1 mole NO) ≈ 9.8 moles NO

Therefore, approximately 9.8 moles of NO can be produced when 26 moles of HNO₃ are consumed.

4. From the balanced chemical equation, we see that 8 moles of HNO₃ react with 4 moles of H₂O. Therefore, we can set up the following proportion:

8 moles HNO₃ / 4 moles H₂O = 75 moles HNO₃ / x moles H₂O

Solving for x, we get:

x = (4/8) × (75 moles HNO₃) / (1 mole H2O) = 37.5 moles H₂O

Therefore, 37.5 moles of H₂O can be produced when 75 moles of HNO₃ are consumed.

5. From the balanced chemical equation, we see that 2 moles of NaClO₃ produce 3 moles of O₂. Therefore, we can set up the following proportion:

2 moles NaClO₃ / 3 moles O₂ = 9 moles NaClO₃ / x moles O₂

Solving for x, we get:

x = (3/2) × (9 moles NaClO₃) / (1 mole O₂) = 13.5 moles O₂

Therefore, approximately 14 moles of O₂ are produced when 9 moles of NaClO₃ are used.

6. The stoichiometric ratio between C and CH₄ from the balanced chemical equation is 1:1. This means that 1 mole of carbon is required to produce 1 mole of methane.

Therefore, we can use the following proportion:

1 mole C / 1 mole CH₄

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Answer: 3.7 m − 6

Explanation: Simplify the expression.

brainliest or a thank you pls :)) <3

The release of neurotransmitters into the synapse is initiated by depolarization, which opens Ca2+ channels, allowing Ca2+ to move vesicles to the synaptic membrane.

This is the correct answer.When an action potential (AP) arrives at the axon terminal, it results in the opening of voltage-gated Ca2+ channels. The influx of Ca2+ into the nerve terminal causes the exocytosis of neurotransmitter-containing vesicles into the synaptic cleft. Calcium influx is thought to trigger neurotransmitter release via a mechanism that involves Ca2+ binding to the vesicle-associated protein synaptotagmin 1 (Syt1), which promotes the interaction of vesicles with the presynaptic membrane.The entry of Ca2+ through voltage-gated calcium channels is critical for neurotransmitter release, and its absence leads to severe neurological disorders such as ataxia and epilepsy. Calcium ion (Ca2+) is one of the most crucial signaling molecules in cells and is essential for many physiological functions, including neurotransmitter release. Calcium ions activate synaptic vesicle fusion and neurotransmitter release by binding to specific proteins in the active zone of the nerve terminal.

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Answer:

I would say ether the first one or the third one because on those questions you always want to choose the one that gives the most information or sound more believe

Hope this helped

According to Heisenberg's uncertainty principle, the minimum uncertainty in the momentum of the electron within the hydrogen atom is given by the expression Δp ≥ h/4πΔx, where Δp represents the uncertainty in momentum, h is the Planck constant (approximately 6.626 x 10^-34 J·s), and Δx represents the uncertainty in position.

In the case of the hydrogen atom, the uncertainty in position is related to the size of the electron's orbit or its average distance from the nucleus. The smallest possible uncertainty in position occurs when the electron is in its lowest energy state, known as the ground state. In the ground state, the electron occupies an orbital with a spherical distribution around the nucleus.

Although the precise location of the electron within the orbital cannot be determined, the uncertainty in position (Δx) is related to the size of the orbital. The average radius of the ground state orbital in hydrogen is approximately 0.529 Å (angstroms).

Using this value for Δx, we can calculate the minimum uncertainty in momentum (Δp) as follows:

Δp ≥ (6.626 x 10^-34 J·s) / (4π × 0.529 Å)

Calculating this expression yields the minimum uncertainty in momentum of the electron within the hydrogen atom.

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The pH of the weak base with a concentration of 0.66 M and Kb value of 8.6 x 10⁻¹⁰ is 9.28.

To find the pH of a weak base, we first need to use the equilibrium constant expression for its reaction with water to calculate the hydroxide ion concentration.

The equilibrium constant expression for the reaction of a weak base, B, with water is:

Kb = [BH⁺][OH⁻] / [B]

Assuming that the initial concentration of the weak base is the same as its equilibrium concentration, we can write:

Kb = x² / (0.66 - x)

where x is the concentration of OH⁻ ions formed when the weak base dissociates.

Since the weak base is weak, we can assume that x is much smaller than 0.66, so we can simplify the equation:

Kb = x² / 0.66

Solving for x, we get:

x = √(Kb x 0.66) = √(8.6 x 10⁻¹⁰ x 0.66) = 1.9 x 10⁻⁵ M

Now, we can use the fact that pH + pOH = 14 to calculate the pH:

pOH = -log[OH⁻] = -log(1.9 x 10⁻⁵) = 4.72

pH = 14 - pOH = 9.28

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Answer:

????????

Explanation:

The  speed of the fallen tree from the hill in km/hr would be 46.4 km/hr.

simple unit conversion is applied here so, The problem here is about converting the speed of an object from one unit to another. Specifically, we are to convert from m/s to km/hr.

Speed is the function of distance and time. Thus, the distance needs to be converted to km from m and the time to hr from s.

13 m/s is equivalent to 13 m distance and 1 second time.

remember that:

1000 m = 1 km

13 m = 13/1000

 = 0.013 km

3600 seconds = 1 hr

1 second = 1/3600

  = 0.00028 hour

The speed of the fallen tree in km/hr will be then:

0.013/ 0.00028  = 46.4 km/hr

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Answer:

72.71 %

Explanation:

For oxygen: mass % O = (mass of 1 mol of oxygen/mass of 1 mol of CO2) x 100. mass % O = (32.00 g / 44.01 g) x 100. mass % O = 72.71 %

HOPED THIS HELPED YOU OUT

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The order of increasing atomic size is: F, Cl, K, Cs.

The atomic size or atomic radius is the distance between the nucleus and the outermost shell of an atom. The atomic size generally increases down a group and decreases across a period on the periodic table.

The given elements are F (fluorine), Cl (chlorine), K (potassium), and Cs (cesium).

Fluorine (F) has the smallest atomic radius because it is the top element of group 17 (halogens) and has the highest effective nuclear charge (the attractive force experienced by the valence electrons towards the nucleus). Chlorine (Cl) has a larger atomic radius than F because it is located below F in the same group.

Potassium (K) has a larger atomic radius than Cl because it is located in group 1 (alkali metals) below Cl. Finally, cesium (Cs) has the largest atomic radius among the given elements because it is located at the bottom of group 1 and has the least effective nuclear charge. Therefore, the order of increasing atomic size is F < Cl < K < Cs.

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The mass of a sample of platinum that has a volume of 3.50 cm³ and a density of 21.45 g/cm³ is 75.075 gm.

Solution :

∵ density = mass ÷ volume

so,  mass = density × volume

∴ mass of platinum sample = (density of sample) x (volume of sample)

                                             = 21.45 × 3.50

   mass of platinum sample = 75.075 gm

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Answer:

is 7.................

Compound A is 1000 times more acidic than Compound B due to the significant difference in their pKa values.

The pKa value is a measure of the acidity of a compound. It represents the negative logarithm (base 10) of the acid dissociation constant (Ka) of the compound. The lower the pKa value, the stronger the acid. In this case, Compound A has a pKa of 7, while Compound B has a pKa of 10.

The pKa difference between two compounds can be used to determine their relative acidity. Since pKa is a logarithmic scale, a difference of 3 units represents a tenfold difference in acidity.

Therefore, Compound A, with a pKa of 7, is three units (10 - 7) lower than Compound B, with a pKa of 10.

To determine how many times more acidic Compound A is than Compound B, we can calculate the ratio of their acidities. Since each unit on the pKa scale represents a tenfold difference, a difference of three units represents a 10 × 10 × 10 = 1000-fold difference.

Therefore, Compound A is 1000 times more acidic than Compound B.

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Answer:

185 gms o NaBr

Explanation:

Na Br  mole weight = 22.989 +79.904 = 102.893  gm/mole

1.083 x 10^24  molecules / 6.022 x 10^23 molecules / mole = 1.798 moles

102.893  *  1.798 = 185 gms

The molarity of the diluted ammonium chloride solution is 0.09475 M.

The molarity of the diluted ammonium chloride solution, we can use the equation:

\(M_1V_1 = M_2V_2\)

here \(M_1\) is the initial molarity

\(V_1\) is the initial volume,

\(M_2\) is the final molarity, and

\(V_2\) is the final volume.

\(M_1\) = 3.79 M (from the initial solution)

,\(V_1\)  = 50.0 mL = 0.050 L (from the initial solution)

\(V_2\) = 2.0 L (the final volume after dilution)

For  \(M_2\) , we get:

\(M_2\)  = ( \(M_1\) × ,\(V_1\) ) /  \(V_2\)

\(M_2\)  = (3.79 M × 0.050 L) / 2.0 L

\(M_2\)  = 0.09475 M

Therefore, the molarity of the diluted ammonium chloride solution is 0.09475 M.

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Answer:

a) Equilibrium shifts in forward direction.

Explanation:

If pressure is increased, equilibrium shifts to the side with the fewer moles of gas.

There are 4 moles of gas in the reactants and 2 moles of gas in the products.

The equilibrium will shift in the forward direction towards the products.

Hope that helps.

Answer:

A

Explanation:

Answer: Level 1's answer is D/ Making observations. The second one is it must restate the question/ B. No. 3:variable (often denoted by x ) whose variation does not depend on that of another. No.4 IS Controlled Vari

Explanation:

Answer:

vwi AC wjkw Jew hill to a friend about our services to our terms of this website are not responsible for all your hard disk space and the rest is just the same time the page you are not logged into the air and the other

The volume of the liquid from the graduated cylinder is 22.5 mL

The last option (22.5 mL) is the correct option

The question seems to be incomplete

The image that completes the question is shown in the attachment below.

From the image, we observe that the liquid meniscus is between the 20 mL and 25 mL marks. That means the volume will lie in this range.

NOTE: The meniscus of a liquid is the upward or downward curve seen at the top of a liquid in a container.

The type of curve shown in the image is a concave meniscus and the volume of the liquid is read from the bottom of the curve.

To read the value from the graduated cylinder, we will first determine the difference between two consecutive lines. Between the 20 mL and 25 mL mark (two thick lines), we have 5 spaces separated by thin lines.

The measure between two consecutive lines is the difference between two thick lines divided by number of spaces between them

∴ The measure between two consecutive lines = (25mL - 20mL) ÷ 5

The measure between two consecutive lines = 5mL ÷ 5 = 1 mL

Now, to read the position of the liquid,

Starting from the 20 mL mark, the liquid exceeds two more lines + half way to the next line ( that is 2mL + 0.5 mL)

∴ The position of the liquid is 20 mL + 2mL + 0.5 mL = 22.5 mL

Hence, the volume of the liquid from the graduated cylinder is 22.5 mL

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Answer:

The answer is  22.5 mL

Explanation:

I hope this helps you :)