How are heterogeneous and homogeneous mixtures separated?

Answer:Pure water does not contain fluoride, but much drinking water does contain fluoride that is deliberately added to reduce tooth decay of children who drink the water. Some drinking water supplies also contain fluoride naturally.

Explanation:

in small doses not harmful

Fluoride is a chemical that is intentionally added to drinking water in order to prevent tooth decay in children. Pure water does not naturally contain fluoride. Some sources of drinking water naturally contain fluoride as well.

Fluoride is a chemical that is intentionally added to drinking water in order to prevent tooth decay in children. Pure water does not naturally contain fluoride. Some sources of drinking water naturally contain fluoride as well.

Compared to magnesium found in food, magnesium in water is present as hydrated ions, which are more easily absorbed. Thus, the role played by water magnesium in the prevention of magnesium insufficiency may be quite important for people who drink water with high magnesium levels.

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A medical examiner can differentiate between death by suffocation and death by carbon monoxide poisoning by conducting an autopsy and examining the body, as well as investigating the circumstances surrounding the death.

Autopsy: During an autopsy, the medical examiner will examine the body for physical signs of suffocation, such as bruises, petechiae (small red or purple spots on the skin caused by bleeding), or damage to the throat, lungs, and airways.

In cases of carbon monoxide poisoning, the medical examiner may look for signs such as cherry-red skin, mucous membranes, and organs, which can indicate high levels of carbon monoxide in the bloodstream.

Toxicology: The medical examiner may also conduct toxicology tests to detect the presence of carbon monoxide in the blood. High levels of carbon monoxide can indicate carbon monoxide poisoning.

Circumstances of death: The medical examiner will also investigate the circumstances surrounding the death, such as whether the victim was found in an enclosed space or near a source of carbon monoxide, such as a car or generator. In cases of suffocation, the circumstances may suggest that the victim was intentionally or accidentally smothered or strangled.

In summary, a combination of physical examination, toxicology tests, and investigation of the circumstances surrounding the death can help a medical examiner differentiate between death by suffocation and death by carbon monoxide poisoning.

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The order of DECREASING electronegativity is Se > As > Sn. The order of DECREASING electronegativity is Ru > Hf > Xe. The order of DECREASING electronegativity is N >  Sb > He.

A functional group or an atom's propensity to draw electrons to itself is referred to as its "electronegativity," which is a chemical attribute. Both the atomic number and the separation between the valence electrons and the charged nuclei have an impact on an atom's electronegativity.

What causes an increase in electronegativity?

As you traverse a period in the periodic table from left to right, the electronegativity of atoms rises. The reason for this is that when you move from left to right across a period, the nuclear charge rises faster than the electron shielding, increasing the atoms' attraction to the valence electrons.

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One common test for carbon dioxide (CO2) is the limewater test. Here's how it works:

Add a small amount of limewater (a solution of calcium hydroxide in water) to a clear container.

Blow into the container, creating bubbles in the limewater.

Observe the limewater. If carbon dioxide is present, it will react with the calcium hydroxide to form calcium carbonate, which will make the limewater turn cloudy or milky.

This test is often used to detect the presence of carbon dioxide in the breath of a person, as well as in various chemical reactions where carbon dioxide may be produced or consumed.

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Answer:

1) two

2) an atom wants a full outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs

3) O=C=O

4) No, there is not because carbon needs four bonds, so it bonds with each-

5) H-O-O-H

Explanation:

Answer: 1) two

2) an atom wants a full outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs

3) O=C=O

4) No, there is not because carbon needs four bonds, so it bonds with each-

5) H-O-O-H

Answer:

if you meant 3.82* 10^24, the answer is 6.34551495 moles

if you meant 3.28*1024, the answer is 6.49780731*10^-21 moles

since you're going from molecules to moles, you need to divide by Avogadro's number which is 6.02*10^23

Answer:

6FCRXCTV

Explanation:

Answer:

b

Explanation:

a p e x

The exact size of an atom is difficult to determine because the electrons in an atom are constantly moving and do not have a precisely defined position at any given moment.

In fact, according to the Heisenberg uncertainty principle, it is impossible to simultaneously determine the exact position and momentum of an electron.

The size of an atom is typically defined by its atomic radius, which is the distance from the nucleus to the outermost electron shell.

However, because electrons occupy a three-dimensional region of space known as an orbital, the atomic radius is not a fixed distance but rather a statistical estimate of the most likely distance an electron will be from the nucleus.

This means that the size of an atom can vary depending on the method used to measure it and the definition of "size" being used.

Additionally, the size of an atom can be influenced by external factors such as temperature and pressure, which can cause the electrons to move farther away or closer to the nucleus.

As a result, determining the exact size of an atom can be a complex and challenging task, and the measured size can only be an approximation.

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Mass of Barium = 720.73 g ; Mass of Phosphorus = 108.37 g ; Mass of Oxygen =  223.91 g

To determine the masses of barium, phosphorus, and oxygen in a sample of barium phosphate (Ba3(PO4)2), you need to calculate the formula weight of the compound and then multiply it by number of moles of  compound in the sample.

First, calculate the formula weight of the compound:

Ba3(PO4)2 formula weight = (3 x 137.327 g/mol) + (2 x (30.97 g/mol + 4 x (16.00 g/mol)) = 601.9 g/mol

n = 1053.8 g / 601.9 g/mol = 1.75 mol

Mass of Barium = 3 x 137.327 g/mol x 1.75 mol = 720.73 g

Mass of Phosphorus = 2 x 30.97 g/mol x 1.75 mol = 108.37 g

Mass of Oxygen = 8 x 16.00 g/mol x 1.75 mol = 223.91 g

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Answer:

C) Na2HAsO4 and Na2SO4

Explanation:

Got it right on Edg

Answer:

The answer is C 65 g/100 mL of water

Explanation:

The amount of Ni(s) produced is approximately 0.027 g (option a).

To calculate the grams of Ni(s) produced during electrolysis, we can use Faraday's law of electrolysis. First, we need to find the moles of electrons transferred.

The charge (Q) can be calculated as Q = current × time, where current is 0.15 amps and time is 10 minutes (600 seconds). So, Q = 0.15 × 600 = 90 coulombs.

Using Faraday's constant (F = 96485 C/mol), we can find the moles of electrons transferred: moles = Q/F = 90/96485 = 9.33 × 10⁻⁴ mol.

Since the oxidation state of Ni^2+ is +2, the moles of Ni²⁺ ions reduced equals half the moles of electrons transferred (9.33 × 10⁻⁴/ 2 = 4.665 × 10⁻⁴ mol).

Lastly, convert moles of Ni²⁺ ions to grams using the molar mass of Ni (58.69 g/mol): mass = moles × molar mass = 4.665 × 10⁻⁴ × 58.69 = 0.027 g.

Hence, the answer of the question is A.

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225.0 g of water releases -33,646.125 J of heat energy when it cools from 85.5°C to 50.0°C.

To calculate the amount of heat released when water cools, we can use the formula:

Q = m * c * ΔT

Where:

Q is the heat energy in joules,

m is the mass of the water in grams,

c is the specific heat of water in J/g•°C,

ΔT is the change in temperature in °C.

Given:

m = 225.0 g

c = 4.18 J/g•°C

ΔT = (50.0°C - 85.5°C) = -35.5°C (negative because the water is cooling)

Substituting these values into the formula, we have:

Q = 225.0 g * 4.18 J/g•°C * (-35.5°C)Q = -33,646.125 J

The negative sign indicates that heat is being released by the water as it cools. Therefore, 225.0 g of water releases -33,646.125 J of heat energy when it cools from 85.5°C to 50.0°C.

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Answer:

D They have the same relative molecular masd

Hydra, a type of cnidarian, have equal survival rates through life because they are equally fit at all stages. Hydra are an example of an organism with a type I survivorship curve. Thus, the correct option is b. II.

Differences between how energy moves through an ecosystem compared to how chemicals move through the ecosystem. The fundamental difference between how energy moves through an ecosystem compared to how chemicals move through the ecosystem is that energy can not be recycled. Energy is obtained from the sun and is stored in organic molecules, and it flows through an ecosystem through metabolic processes. However, the number of chemicals like carbon, oxygen, nitrogen, water, and phosphorus remains constant in an ecosystem.

Tropical rainforest soils are usually nutrient-poor and low in organic matter. Therefore, option c. nutrient-poor and low in organic matter is the correct answer. The soil in the tropical rainforest is nutrient-poor because heavy rainfall washes away the nutrients, and the soil contains a high level of aluminum and iron, which are toxic to plants. Due to these reasons, there is slow decomposition of organic matter that makes the soil low in organic matter.

Thus, the correct option is b.

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The diagrams of the arrangement of the electrons in calcium and magnesium have been shown in the image attached to this answer. There are two electrons in the valence shell of calcium.

We know that the electrons are the subatomic particles that we can be able to see in the shells of the atom. It is important that we ought to know that the electrons are the particles that are known to be responsible for the reactivity of the atom.

The number of the electrons that we can find in the atom would depend on the number of the protons that we have in the nucleus of the atom and this is because for the atom to be electrically neutral then we would have to have the same number of electrons and protons being in the atom as we know.

It is clear that calcium is a member of group two of the periodic table and that magnesium is also a member of group two of the periodic table.

The structures for calcium would have Ca and two dots while that of magnesium would have Mg and two dots.

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We know the standard reduction potentials of the half-cells involved, so we can find the cell voltage and the spontaneous reaction. Thus;

The anode reaction is:

Pb(s) → Pb2+(aq) + 2e-

This is the oxidation half-reaction that occurs in the Pb half-cell.

The cathode reaction is:F2(g) + 2e- → 2F-(aq).

This is the reduction half-reaction that occurs in the F2 half-cell.

The spontaneous cell reaction is

:Pb(s) + F2(g) → Pb2+(aq) + 2F-(aq).

This is the combination of the oxidation and reduction half-reactions, with the electrons canceled out from both sides.

The cell voltage is 2.996 V The standard cell potential is calculated as follows:

standard cell potential = E°(reduction) - E°(oxidation)standard cell potential = 2.870 V - (-0.126 V)standard cell potential = 2.996 V, The cell voltage is positive, indicating that the reaction is spontaneous.

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Answer:

5.0 °C

Explanation:

To find the temperature change, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = heat energy (J)

-----> m = mass (g)

-----> c = specific heat capacity (J/g°C)

-----> ΔT = temperature change (°C)

You can find the temperature change by plugging the given values into the equation and simplifying.

Q = 209 J                      c = 4.18 J/g°C

m = 10.0 g                     ΔT = ? °C

Q = mcΔT                                                      <----- Equation

209 J = (10.0 g)(4.18 J/g°C)ΔT                     <----- Insert values

209 J = (41.8)ΔT                                           <----- Multiply 10.0 and 4.18

5.0 = ΔT                                                       <----- Divide both sides by 41.8

Answer:

5° C  temp change

Explanation:

Q = m c T  

       Given:  Q =209    m = 10    c = 4.18     looking for T (change in temp)

209 = 10 * 4.18 T

T = 209 / (10*4.18) = 5° C

Answer:

1.VOLUME– The amount of space an object takes up. Basic Unit (SI Unit) for Solids – Cubic Meter, m3. LENGTH/DISTANCE – The measurement between two points.

2.one particle per cubic meter.

3.it means it is heavier

4.In a liquid the particles are still close together but a little further apart than in a solid.

5.In gases the particles are much further apart than in solids or liquids.

Explanation:

thats all i can type lol

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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Answer:

The one on the top,'' As the water cool, it is returned to the boiler where it is heated,''

Explanation:

Answer: Thus 44 g of \(CO_2\) will be produced  if 30 g of \(C_6H_{12}O_6\) were reacted with an excess of oxygen

Explanation:

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)    

\(\text{Moles of} C_6H_{12}O_6 =\frac{30g}{180g/mol}=0.17moles\)

The balanced chemical equation is:  

\(C_6H_{12}O_6 +6O_2(g)\rightarrow 6CO_2+6H_2O(g)\)

As \(C_6H_{12}O_6\) is the limiting reagent as it limits the formation of product and \(O_2\) is the excess reagent.

According to stoichiometry :

1 mole of \(C_6H_{12}O_6\) produce =  6 moles of \(CO_2\)

Thus 0.17 moles of \(C_6H_{12}O_6\) will produce=\(\frac{6}{1}\times 0.17=1.0mole\)  of \(CO_2\)

 Mass of \(CO_2=moles\times {\text {Molar mass}}=1.0moles\times 44g/mol=44g\)

Thus 44 g of \(CO_2\) will be produced  if 30 g of \(C_6H_{12}O_6\) were reacted with an excess of oxygen.

The salt solution Cr(NO₃)₃ is acidic because it is formed from the reaction between a weak base, Chromium(III) hydroxide, and a strong acid, Nitric acid.

To determine if the salt solution Cr(NO₃)₃ is acidic, basic, or neutral, let's consider the following:
-Cr(NO₃)₃ is a salt formed by the reaction between a metal ion, Chromium(III) (Cr₃+), and a polyatomic anion, Nitrate (NO₃-). The acidic or basic nature of a salt solution depends on the parent acid and base that formed it.

-In this case, Cr(NO₃)₃ is formed from the reaction between Chromium(III) hydroxide (Cr(OH)₃), a weak base, and Nitric acid (HNO₃), a strong acid.

-Cr(OH)₃ + 3HNO₃ → Cr(NO₃)₃ + 3H₂O

-Since the parent acid, HNO₃, is a strong acid and the parent base, Cr(OH)₃, is a weak base, the salt solution Cr(NO₃)₃ will be acidic.

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The pH of the buffer solution composed of 2.00 mol of acid and 8.25 mol of the conjugate base is 5.01

A buffer solution is one that is capable of resisting changes in pH, even when a strong acid or base is added to it. The pH of the buffer is determined by the amount of acid and its conjugate base present in the solution, as well as the pKa of the acid.

A buffer solution is composed of 2.00 mol of acid and 8.25 mol of the conjugate base. If the pKa of the acid is 4.40, the pH of the buffer can be calculated as follows :

First, calculate the ratio of the conjugate base to the acid, using the equation :

pH = pKa + log [base]/[acid]  where : pH = the pH of the buffer ; pKa = the acid dissociation constant ;

log = the base 10 ; logarithm[base] = the concentration of the conjugate base ; [acid] = the concentration of the acid

Substitute the given values into the equation :

pH = 4.40 + log [8.25]/[2.00]

pH = 4.40 + log 4.125

pH = 4.40 + 0.614pH = 5.01

Therefore, the pH of the buffer solution composed of 2.00 mol of acid and 8.25 mol of the conjugate base is 5.01

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Answer:

432

Explanation:

A first order reaction is characterized by the rate being proportional to the concentration of one reactant. In this case, AB → A + B has a 71% completion after 43 s. To find the half-life, we can use the integrated rate law for first order reactions: ln([A]₀/[A]) = kt, where [A]₀ and [A] are the initial and final concentrations, k is the rate constant, and t is time. Since the reaction is 71% complete, 29% of AB remains. Therefore, ln(1/0.29) = k(43 s). Solving for k, we get k ≈ 0.029 s⁻¹. The half-life (t₁/₂) formula for a first order reaction is t₁/₂ = 0.693/k. Substituting the value of k, we get t₁/₂ ≈ 24 s. The half-life of this reaction is approximately 24 seconds, using 2 significant figures.

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The question is incomplete, the complete question is;

Each sentence describes potential and kinetic energy at various locations on a slide. Complete each statement by selecting the position of the object on the slide.

An object at position has all kinetic energy. A B or C

An object at position has all potential energy. A B or C

An object at position has about half potential energy and half kinetic energy. A B or C

Answer:

An object at position C has all kinetic energy.

An object at position A has all potential energy.

An object at position B has about half potential energy and half kinetic energy.

Explanation:

Lets take a good look at the image.

At position A, the object is stationary and we know that the energy possessed by an an object by virtue of its position is known as potential energy. Hence at A, the energy possessed by the body is all potential.

At position B, the total mechanical energy of the object becomes potential energy + kinetic energy as the object is now in motion.

At position C, the object is still in motion and the energy is all kinetic.

Answer:

C

A

B

Explanation:

Answer:

There are 63.546 grams in a 2.50 moles of copper.

Answer:

b. Individual atoms of argon

Explanation:

Hope this helps!

-Justin