Help me with this pls

This exercise is from Barbershop can keep men healthy by Joseph Ravenell, and is related to High Blood Pressure.

Mr. Ravenell describes the essence of the black barbershop as a place where there is friendship, trust and cooperation, and peace. (1a)

He considers it a safe haven because is void of stress and societal threats. (1b)

Some of the health-related topics that were discussed in the barbershop include but are not limited to:

Denny states that black men trust their barbers more than their doctors because most of them relate more with their barbers than with their doctors.

Mr. Ravenell taught barbers how to measure blood pressure, and how to counsel their customers to go see a doctor if their blood pressure was too high.

It was discovered that the number of those whose blood pressure were controlled in the 18 shops that were studied for one year were higher in the shops where the barbers had been trained.

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The relative probability of a CO2 molecule having three times the average kinetic energy (3eavg) compared to one having the average kinetic energy (eavg) is low.

The average kinetic energy of a gas molecule is directly proportional to its temperature. In the case of carbon dioxide (CO2), the average kinetic energy of its molecules at a given temperature determines their speed and motion.

Assuming a temperature remains constant, the probability of a CO2 molecule having three times the average kinetic energy (3eavg) compared to having the average kinetic energy (eavg) is relatively low.

At a given temperature, the distribution of kinetic energies among a group of gas molecules follows the Maxwell-Boltzmann distribution. This distribution describes the probability of finding a molecule with a specific kinetic energy.

The distribution is skewed towards lower energies, with fewer molecules having higher energies. Since the relative probability of a molecule having three times the average kinetic energy is significantly lower, it suggests that very few CO2 molecules within a sample would possess such high energies.

The relative probability can be understood by considering the shape of the Maxwell-Boltzmann distribution curve. The curve has a peak at the average kinetic energy (eavg) and tapers off towards higher energies. As we move further away from the peak (eavg), the number of molecules possessing those higher energies decreases rapidly.

Therefore, the likelihood of a CO2 molecule having three times the average kinetic energy (3eavg) compared to eavg is relatively low, indicating that it is an infrequent occurrence.

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Answer:

30100000000000000000 atoms

Explanation:

Ar of Fe : 56

0.028/56 = 0.0005 moles of Fe

0.0005 * 6.02 * 10^23(Avagardro's law of constant)

= 3.01*10^20 atoms

Answer:

A. 7

(assuming the water is neutral)

The heat transfer during the combustion of n-octane gas (C8H18) with 95% excess air in a constant pressure burner is 37039 kJ/kg fuel. This is calculated using the enthalpy of the formation of the products and reactants. The air and fuel enter the burner steadily at standard conditions, and the products of combustion leave at 265°C.

The enthalpy of combustion of the fuel is determined by subtracting the enthalpy of formation of the reactants from the enthalpy of formation of the products. The enthalpy of formation of the reactants is determined by multiplying the standard enthalpy of formation for each compound in the reaction by the number of moles of each compound and adding the result.

The enthalpy of formation of the products is determined by multiplying the standard enthalpy of formation for each compound in the reaction by the number of moles of each compound and adding the result. The heat transfer during combustion is then determined by subtracting the enthalpy of formation of the reactants from the enthalpy of formation of the products, resulting in 37039 kJ/kg fuel.

The heat transfer during the combustion of n-octane gas (C8H18) can be calculated using the formula Q = m × Cp × ΔT. Here, m is the mass of the fuel burnt, Cp is the specific heat capacity, and ΔT is the change in temperature. Let's substitute the given values: Mass of fuel burnt = 1 kg (since 37039 kJ/kg fuel is given)Cp of n-octane gas = 2.22 kJ/kg/K (given)ΔT = (265 - 25) = 240 K (since the temperature of products is given as 265°C = 538 K and standard temperature is 25°C = 298 K)Therefore, the heat transfer during combustion of n-octane gas is: Q = m × Cp × ΔT = 1 × 2.22 × 240 = 532.8 kJAnswer: The heat transfer during this combustion is 532.8 kJ.

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Time = distance ÷ speed

Time = 1950 ÷ 600

Time = 3.25 hours ( 3 hours 15 minutes )

Subtract the initial mass from final mass, i.e., vm.

Answer:

C. 7.4 kJ

Explanation:

Let assume that Mercury is at room temperature (25 °C). The energy required to boil the sample of mercury is the sum of sensible and latent heats. Mercury has a fussion and boiling points of -38.83 °C and 356.7 °C, respectively, and a specific heat of \(138\,\frac{J}{kg\cdot ^{\circ}C}\). Then:

\(Q = (25\,g)\cdot \left[\left(0.138\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (356.7^{\circ}C - 25^{\circ}C) + 296\,\frac{J}{g} \right]\)

\(Q = 8544.365\,J\)

The option that offers the best approximation to the result is C.

The correct nuclear equation for 24195Am's alpha decay is a, as it involves a nucleus releasing an alpha particle, transforming into a different nucleus. Other options represent beta, electron, and neutron decays. Correct answer is a. 241 95 Am yields 4 2 He + 237 93 Np

The nuclear equation for the alpha decay of 24195Am is a. 24195Am yields 42He + 23793Np. This is because alpha decay is a type of radioactive decay in which a nucleus releases an alpha particle (a helium nucleus) and thereby transforms (or decays) into a different nucleus. The mass number of the parent nucleus decreases by four and the atomic number decreases by two when an alpha particle is emitted.

To balance the equation, the mass and atomic numbers of the products must add up to the mass and atomic numbers of the reactant. Therefore, the correct nuclear equation for the alpha decay of 24195Am is:24195Am → 42He + 23793Np

(a)The other options (b-e) represent different types of nuclear decay, such as beta decay (b, d), electron capture

(c), and neutron capture

(e). Beta decay involves the emission of a beta particle (an electron or positron), while electron capture involves the absorption of an electron by a nucleus. Neutron capture involves the absorption of a neutron by a nucleus, while alpha decay involves the emission of an alpha particle (a helium nucleus).Therefore, the correct answer is option a.

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The direction of the water between the beaker containing a 25% salt solution and the bag inside with pure water would be from beaker to bag with pure water.

If the beaker had pure water and the bag with salt solution, the water would move from bag to beaker with pure water.

The beaker has salt solution (salt (solute) + water (solvent)). The bag has pure water without any solute. The water normally moves from higher concentration to lower concentration.

Water containing solute would have higher concentration than pure water. Thus, water moves from beaker with higher concentration to bag with lower concentration. The process is called osmosis.

Similarly, if we change the components in beaker and bag, the water would move from bag with higher concentration to beaker with pure water of lower concentration.

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Answer: because acid and water react in a vigorous exothermic reaction, releasing heat, sometimes boiling the liquid.

Answer:Mg>Zn>Pb>Cu

Explanation:

\(\sf\bold{❍ Given:-}\)

NaOH is dissolved in certain kilograms of solvent and molality of solution 0.5m.

Again , same among of NaOH is dissolved in 100 grams of solvent than initial , then molality becomes 0.625m.

$\space$

Now lets find the amount of NaOH and the initial mass of solvent.

Let,

$\space$

$\sf\bold{ ❍ We\:know,}$

$\sf{Molality(m)=}$ $\sf\dfrac{No.of\:moles\:of\:solute}{No.of\:solvent\:in\:kg}$

$\space$

$\sf\bold{Putting\:the\:formula:-}$

$\space$

$\sf\huge\underline\bold{ ❍Case:1}$

$\space$

$\longmapsto$ $\sf\small{0.5}$ $\sf\dfrac{x}{y}$

$\space$

$\longmapsto$ $\sf{0.5y = x }$

$\space$

$\longmapsto$ $\sf{multiply\:by\:2→ y = 2x}$

$\space$

$\sf\huge\underline\bold{ ❍Case:2}$

$\space$

$\longmapsto$ $\sf\small{0.625}$ $\sf\small\dfrac{x}{y}$ = $\sf\dfrac{x}{y=100g}$

$\space$

$\longmapsto$ $\sf\small{0.625}$ $\sf\dfrac{x}{y-100/1000kg}$ = $\sf\dfrac{x}{y-0.1kg}$

$\space$

$\longmapsto$ $\sf{0.625(y-0.1kg)=x}$

$\space$

$\longmapsto$ $\sf{0.625y-0.0625=x}$

$\space$

$\sf\small\bold{By\:putting\:the\:value\:of \:"x" we\: get:}$

$\space$

$\longmapsto$ $\sf{0.625(2x)-0.0625 = x}$

$\space$

$\longmapsto$ $\sf{1.25x 0.0625 = x}$

$\space$

$\longmapsto$ $\sf{1.25x - x = 0.0625}$

$\space$

$\longmapsto$ $\sf{0.25x = = 0.0625}$

$\space$

$\longmapsto$ $\sf\small{x=}$ $\sf\dfrac{0.0625}{0.25}$= $\sf\bold{x=0.25}$

$\space$

$\sf{So,y=2(x)=2\times0.25=}$ $\sf\bold{y=0.5}$

$\space$

$\sf\small{Initial\:mass\:of\:solvent:0.5kg=500g}$

$\space$

$\sf{Now,}$

Amount of NaOH=

$\space$ $\space$ $\space$ $\space$ $\space$ $\sf{=x\times molar\:mass}$

$\space$ $\space$ $\space$ $\space$ $\space$ $\sf{=0.25\times 40=10}$

$\space$

$\sf\underline{\underline{ ⚘ Hence,amount\:of\:NaOH=10kg}}$

_______________________________

The rate at which hemoglobin is synthesized depends on the availability of: iron.

Hemoglobin is a protein molecule found in red blood cells responsible for transporting oxygen from the lungs to the tissues and carbon dioxide from the tissues to the lungs.

Hemoglobin contains iron, which is essential for its function. The iron binds to oxygen in the lungs and releases it in the tissues.

Therefore, iron is necessary for the synthesis of hemoglobin. Without sufficient iron, the body cannot produce enough hemoglobin to meet the oxygen-carrying demands of the tissues.

Iron deficiency can lead to anemia, a condition characterized by a decrease in the number of red blood cells and a decrease in hemoglobin levels.

Iron is obtained from the diet and is absorbed in the small intestine. A diet low in iron or conditions that impair iron absorption can lead to iron deficiency and anemia.

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In the electrophilic aromatic substitution reaction between benzaldehyde and Br2 in the presence of FeBr3, the first step involves the generation of a carbocation intermediate. This carbocation is formed when the bromine molecule attacks the benzene ring, displacing a proton.

Since benzaldehyde is a meta-director, the carbocation intermediate will be stabilized through resonance. The resonance structures can be represented as follows:

Structure 1:

      Br

       |

Ph-C(+)-H

       |

Structure 2:

      Br

       |

Ph-C-H

  |    |

  +    Ph

Structure 3:

      Br

       |

Ph-C-H

  |    |

Ph    +

In these resonance structures, the positive charge of the carbocation is delocalized throughout the benzene ring. The presence of the electron-withdrawing aldehyde group (CHO) in benzaldehyde directs the incoming bromine atom to the meta position relative to the aldehyde group.

Please note that it's always recommended to consult reliable sources and appropriate references for accurate structural representations.

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The student's claim of 4.64 × 10^24 molecules is incorrect, and the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

The mistake the student made is assuming that the molar mass of ammonium acetate directly corresponds to the number of molecules. However, the molar mass of a substance represents the mass of one mole of that substance, not the number of molecules.

To determine the correct number of molecules of ammonium acetate used in the reaction, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, etc.) in one mole of a substance.

Avogadro's number is approximately 6.022 × 10^23 particles/mol. Given that the student used 0.100 mol of ammonium acetate, we can calculate the correct number of molecules by multiplying the number of moles by Avogadro's number:

Number of molecules = (0.100 mol) × (6.022 × 10^23 molecules/mol)

Performing the calculation, we find that the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

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Answer:

thermal, I'm not 100% sure though.

Answer:

MnO2 + 4HCL = MnCl2 +2H2O + Cl2

At a pH of 7, the charged groups present in glycine are -NH3+ and -COO−.

So, the correct answer is D) A and B.

At this pH, the amino group (-NH3+) is positively charged, and the carboxyl group (-COO−) is negatively charged, resulting in a zwitterionic form of glycine. The amino group (-NH2) on glycine can act as a base and pick up a hydrogen ion (H+) to become positively charged (-NH3+), while the carboxyl group (-COOH) can act as an acid and donate a hydrogen ion to become negatively charged (-COO-).

Therefore, at pH 7, the amino group is protonated to become -NH3+ and the carboxyl group is deprotonated to become -COO-. The net charge of glycine at pH 7 is neutral, as the positive and negative charges cancel each other out.

The chemical structure of glycine at pH 7 can be represented as H3N+CH2COO-.

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The height of a ramp does not directly determine the strength of the frictional force between a book and an object.

The strength of the frictional force between a book and an object is not directly influenced by the height of a ramp. The nature of the surfaces in contact, the force forcing the surfaces together (normal force), and the coefficient of friction are some of the variables that affect the frictional force between two surfaces.

The coefficient of friction between the book and the object plays a major role in determining the strength of the frictional force.

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Answer:

Because graphite has delocalised electrons ,just like metal

Graphite is the allotrope of carbon. Allotropes are chemical compounds of the single element present and arranged in a complex form.

The uses of the graphite are as follows:-

Graphite the is allotropes of the carbon which means it has a free electron in the valence shell. In graphite, there is one free electron which moves from one place to another.

The movement of transferring the electron in the compound can allow the graphite to conduct heat.

Hence, the free electron is the answer.

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Answer:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

The total ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and are represented as ions.

The net ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and do not show the spectator ions which are same in the reactants and the products.

a) zinc nitrate + calcium sulphide \(\rightarrow \) zinc sulphide + calcium nitrate

balance equation : \(Zn(NO_3)_2(aq)+CaS(aq)\rightarrow ZnS(s)+Ca(NO_3)_2(aq)\)

total ionic equation :

\(Zn^{2+}(aq)+2NO_3^-(aq)+Ca^{2+}(aq)+S^{2-}(aq)\rightarrow ZnS(s)+Ca^{2+}(aq)+2NO_3^-(aq)\)

net ionic equation :

\(Zn^{2+}(aq)++S^{2-}(aq)\rightarrow ZnS(s)\)

b) potassium + calcium chloride  \(\rightarrow \) potassium chloride + calcium

balance equation : \(2K(s)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(s)\)

total ionic equation :

\(2K(s)+Ca^{2+}(aq)+2Cl^-(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca\)

net ionic equation: \(2K(s)+Ca^{2+}(aq)+\rightarrow 2K^+(aq)++Ca\)

The correct answer is C. A television

Explanation:

Plasma is a particular state of matter that differs from liquid, solid, and gas because plasma is a gas but contains mainly particles that have lost their electrons or ions. This makes plasma have properties other states do not have. Additionally, plasma is now widely used in technologies, including televisions, this is because plasma is used in thousands of small containers to create the images in a Tv. This leads to high quality and precise images. Therefore, the commercial technology that commonly uses plasmas is a television.  

Answer:

c

Explanation:

edge

Answer:

Thomson--atoms cotain electron

Ernest Rutherford--atoms have a positive nucleus

R.A Millikan--electrons have Q=-1

Dalton--atoms are indivisible

Millikan---> Electrons have a charge of -1

Rutherford ---> Atoms have a positive nucleus

Thomson -----> Atoms contain electrons

Dalton --------> Atoms are indivisible

The atomic theory went through several modifications and different scientists proposed various models of the atom until our present conception of the atom was developed.

The atom was first defined as the smallest indivisible particle of a substance. This idea of "indivisibility" of the atom stems from Dalton's theory.

The fact that atoms were composed of negatively charged electrons was proven by the experiments of J.J Thompson using the cathode ray tube. Millikan's charge to mass experiment showed that the electron has a charge of -1.

Rutherford, in his famous gold foil experiment showed that atoms were composed of a positively charged nucleus.

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Answer:

the answer would be convection because it is being touched by the water

Answer:

the general equation is: A + X → AX. Where a single compound on the reactant side breaks down into two or more products during a chemical change. The general equation is AX → A + X.

Explanation:

Answer:

Aluminium (Al): (3*2)+(5*2)=16

Sulphor (S): (3*1)=3

Oxygen (O): (4*3)+(3*1)=15

Answer:

See below

Explanation:

From the equation you can see 5  mole O2   results in   3 moles CO2

( this is the limiting reagent because   C3H8 : O2  is   1:5)

6.2 / 5   *  3  = 3.72 moles CO2 produced

CO2 weighs ~ 44 gm/mole      44 gm/mole * 3.72 mole = 163.68 gm of CO2  

One mole of the substance contains the (Avogadro number) molecules. The number of the atoms in 0.750 moles is 4.5  × 10²³ atoms.

The number of the molecules in 1 moles is as follows :

1 mole = 6.02 × 10²³ atoms or molecules

This number is called as the Avogadro number. Therefore, in 1 mole of the substance there will be 6.02 × 10²³ atoms or the molecules.

The number of the moles = 0.750 mol

The number of atoms in 0.750 mol is as :

The number of atoms = 0.750 × 6.02 × 10²³ atoms

The number of atoms  = 4.5  × 10²³ atoms.

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