The cuticle scales of the hair always point toward the a) root b) medulla c) tip of the hair d) follicle

Answer:

5

Explanation:

Temperature calculates heat/the temperature in the specific location.

In the reaction between a monosaccharide and a ferric ion, The carbonyl carbon is oxidized to a carboxyl group, the cupric ion is reduced.

Chemical reactions often involve color changes, temperature changes, gas evolution, or precipitate formation. Simple examples of everyday reactions are digestion, combustion, and cooking. The definition of reaction is a reaction. An example of a reaction is someone stopping their car at a stop sign. noun. response to stimuli.

The five basic types of chemical reactions are combination, decomposition, single exchange, double exchange, and combustion. By analyzing the reactants and products of a particular reaction, we can classify them into one of these categories. Some responses fit into multiple categories. It is modeled after the old Italian reaction, the French response, derived from the medieval Latin response (nominative to react). It is a noun of action formed in Late Latin from the past participle stem of the Latin reader.

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Answer:

91.49 grams

Explanation:

No of molecules = no of moles × Avogadro's number

No of moles = No of molecules / Avogadro's number

Number of moles = 5.4×10^23/6.02×10^23

Number of moles = 0.897 moles of Al2O3

Number of moles = mass in gram / molar mass

Mass in gram = number of moles× molar mass

Mass in gram = 0.897× 102

91.49 grams

Increasing the volume of the solution decreases the concentration of the hydrogen ions which subsequently increases the pH;  hence, increasing volume will increase the pH.

Higher is the concentration of H plus ions, more acidic is the solution and  lower the concentration of H plus ions, the less acidic is the solution. Basic strength of a solution depends on the concentration of OH minus ions.

When an acid and alkali react together, they produce salt and water. Acid + alkali → salt + water . As you know, water is neutral, so the acid alkali come together to neutralize each other to make pH 7.

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The mass number is the atomic mass rounded to a whole number.

The mass number, can be regarded as the atomic mass number or nucleon number, which can be seen as the total number of protons  as well as neutrons in an atomic nucleus however if it is  approximated , it can be considered to be equal to the atomic mass of the atom expressed in atomic mass units.

It should be noted that the mass number is established by rounding the atomic weight to the nearest whole number.

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Answer:

Propane

Explanation:

Sulfites are antioxidant that is used as a preservative in some foods. They can help prevent spoilage and discoloration in certain foods and are commonly found in dried fruits, wine, and some processed foods.

However, sulfites can also trigger allergic reactions in some people, especially those with asthma, so they are regulated by the FDA and must be listed on food labels if they are added to a product. Other preservatives may also be used in food products, but sulfites are a common and well-known example.
The term that refers to an antioxidant used as a preservative in some foods is "sulfites." Sulfites are chemical compounds that help prevent spoilage and maintain food freshness by inhibiting the growth of microorganisms and preventing oxidation. They are commonly used in the preservation of dried fruits, wine, and some processed foods. While sulfites are effective as a preservative, they can cause allergic reactions in some individuals, particularly those with asthma. Gastrointestinal refers to the digestive system, and botulism is a serious foodborne illness caused by toxins produced by the bacterium Clostridium botulinum.

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Water - H2O; Ammonia - NH3; Hydrogen sulfide - H2S; Ethanol - C2H6O are examples of polar covalent bonds.

What is a polar covalent bond?

A polar covalent bond is a bond created by exchanging electrons between two atoms with different electronegativities.

A molecule that depends on polar covalent bonding is the water molecule, which consists of two hydrogen atoms and one oxygen. Due to the different electronegativity values of each element, the electrons are not uniformly distributed, with the oxygen atom spending more time with them than the hydrogen atoms. Because the chloride ion is more electronegative than the hydrogen ion, HCl is a polar covalent molecule. Therefore, hydrogen has a partial positive character, whereas the chloride ion has a partial negative character. Given that the hydrogen and chlorine atoms share electrons, HCl exhibits covalent behavior.

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The radius of a tantalum atom if its crystal structure is a BCC with a density of 16. 6 g/cm3 and its atomic mass is 180. 9 amu is 1.456 Å.

The radius of a tantalum atom can be calculated using the formula:

r = (3Vc/4πn)\(^\frac{1}{3}\)

where Vc is the unit cell volume, n is the number of atoms in the unit cell, and r is the radius of the atom.

For a BCC structure, there are 2 atoms per unit cell, so n = 2. The unit cell volume for a BCC crystal structure is given as:

Vc = (64/3√3)a³

where a is the length of the edge of the cube.

To solve for the radius of the tantalum atom, we need to first calculate the length of the edge of the cube. We can use the density of tantalum to calculate its atomic mass density:

ρ = m/V

where ρ is the density, m is the mass of the unit cell, and V is the volume of the unit cell. For a BCC unit cell, the mass of the unit cell can be calculated as:

m = n × atomic mass

where n is the number of atoms per unit cell and atomic mass is the atomic mass of the element. Substituting the values given, we get:

ρ = m/V = n × atomic mass / Vc

Rearranging the equation and solving for a, we get:

a = (4ρVc/2n×atomic mass)^⁰⁵

Substituting the given values and solving for a, we get:

a = [(4 × 16.6 g/cm³ × (64/3√3)a³) / (2 × 2 × 180.9 g/mol)]\(^\frac{1}{2}\)

Simplifying the expression, we get:

a = 3.307 Å

Now, we can calculate the radius of the tantalum atom using the formula:

r = (3Vc/4πn)\(^\frac{1}{3}\)

Substituting the values we have calculated, we get:

r = [(3 × (64/3√3)a³) / (4π × 2)]\(^\frac{1}{3}\) = 1.456 Å

Therefore, the radius of a tantalum atom in a BCC crystal structure with a density of 16.6 g/cm3 and an atomic mass of 180.9 amu is approximately 1.456 Å.

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When a 13.9 g sample of solid sodium hydroxide (NaOH) dissolves in 250.0 g of water in a coffee-cup calorimeter initially at 23.0 °C, the final temperature of the solution is approximately 4.0 °C.

To find the final temperature of the solution, we can use the principle of conservation of energy. The heat gained by the water will be equal to the heat lost by the solid sodium hydroxide.

First, let's calculate the heat gained by the water:

Heat gained by water = (mass of water) × (specific heat of water) × (change in temperature)

mass of water = 250.0 g

specific heat of water = 4.18 J/g·K

change in temperature = (final temperature - initial temperature)

Next, let's calculate the heat lost by the sodium hydroxide:

Heat lost by sodium hydroxide = (mass of NaOH) × (enthalpy change per mole)

mass of NaOH = 13.9 g

enthalpy change per mole = -44.4 kJ/mol

Since we are given the mass of NaOH in grams, we need to convert it to moles:

moles of NaOH = (mass of NaOH) / (molar mass of NaOH)

The molar mass of NaOH is 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 39.00 g/mol

Now we can calculate the heat gained by the water and the heat lost by the sodium hydroxide:

Heat gained by water = (250.0 g) × (4.18 J/g·K) × (final temperature - 23.0 °C)

Heat lost by sodium hydroxide = (13.9 g / 39.00 g/mol) × (-44.4 kJ/mol)

Since the heat gained by the water is equal to the heat lost by the sodium hydroxide, we can set up an equation:

(250.0 g) × (4.18 J/g·K) × (final temperature - 23.0 °C) = (13.9 g / 39.00 g/mol) × (-44.4 kJ/mol)

Simplifying the equation:

(4.18 J/g·K) × (final temperature - 23.0 °C) = (-13.9 g / 39.00 g/mol) × (44.4 kJ/mol)

Now we can solve for the final temperature:

(final temperature - 23.0 °C) = [(-13.9 g / 39.00 g/mol) × (44.4 kJ/mol)] / (4.18 J/g·K)

(final temperature - 23.0 °C) ≈ -19.0 °C

Finally, we can calculate the final temperature of the solution:

final temperature ≈ -19.0 °C + 23.0 °C

final temperature ≈ 4.0 °C

Therefore, the final temperature of the solution is approximately 4.0 °C.

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Kinetic energy is an energy present in the object with motion. When the water freezes then the speed of the molecules decreases. Thus, option A is accurate.

Kinetic energy is possessed by an object when it is in moving motion and because of the molecules. When the temperature decreases the movement of the molecule decreases.

The decrease in the kinetic energy results in a gain of potential energy and release of heat in the surrounding. The temperature and the kinetic energy are directly proportional and affect the speed of the molecules.

Therefore, the freezing of water results in decreased speed of the water molecule.

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Answer:

Explanation:

Hi there!

We have,

1 mole of Al = 6.23*\(10^{23}\) atoms

Also given no. of atoms = 3.90 x \(10^{22}\) atoms

Now,

6.23*\(10^{23}\) atoms= 1 mole

1 atom = \(\frac{1 }{6.23*10^{23}}\) moles

or, 3.90 x \(10^{22}\) atoms =  \(\frac{1 }{6.23*10^{23}}\) *3.90 x \(10^{22}\) moles

Therefore, 3.90 x \(10^{22}\) atoms has 0.0626 mols of Al.

Hope it helps!

Answer:

EASY ITS BUILT DIFERENT

Explanation:

Taking into account the direction the meter points will be from left to right, the copper (||) ions are being reduced and Zn is being oxidized in the zinc and copper galvanic cell.

The direction of the flow of elections will be indicated by the direction of the needle, which will move from left to right. At this point, oxidation takes place at the Zn electrode, resulting in the release of e-, whilst the reduction of Cu+2 ion takes place at the Cu electrode, leading to the movement of electrons from left to right.

The correct answer is that the copper (||) ions are being reduced while the zinc ions are being oxidized.

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Answer:

9

Explanation:

Given parameters:

    what is  b² - 4ac  of

 Equation x² - 5x + 4 = 0

Solution:

    x² - 5x + 4 in the form ax + bx + c = 0

  a is the coefficient of x²  = 1

                                      b = -5

                                      c = 4

Input the parameters and solve;

   b² - 4ac = -5² - 4(1)(4)

                 = 25 - 16

                  = 9

Answer is yes because to say that the tank is half empty would mean that all the oxygen molecules only occupy half or less of the tank.

The percent yield of the reaction is 132.1%.

Actual yield is the amount of product obtained in a chemical reaction, while theoretical yield is the amount of product that should be obtained based on stoichiometric calculations.

The balanced chemical equation for the reaction is:

Ga + 2 HCl → GaCl2 + H2

From the equation, we can see that 1 mole of Ga produces 1 mole of H2.

The number of moles of H2 produced in the reaction can be calculated as:

moles of H2 = mass of H2 produced / molar mass of H2

= 0.352 g / 2.016 g/mol

= 0.175 mol

The theoretical yield of H2 can be calculated based on the number of moles of Ga used in the reaction:

moles of Ga = mass of Ga / molar mass of Ga

= 9.23 g / 69.72 g/mol

= 0.1324 mol

moles of H2 (theoretical yield) = moles of Ga

= 0.1324 mol

The percent yield can be calculated as:

percent yield = (actual yield / theoretical yield) x 100%

= (0.175 mol / 0.1324 mol) x 100%

= 132.1%

Therefore, the percent yield of the reaction is 132.1%. Since the percent yield is greater than 100%, it is likely that some error occurred during the experiment, such as incomplete reaction or loss of product.

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The masses of iron oxide that should be produced when each sample given in Figure 1 burns in the air is as follows:

The masses of iron oxide produced from the burning of iron in the air is obtained from the mass ratio as derived from the balanced equation of the reaction.

Equation of reaction: 4 Fe + 3 O₂---> 2 Fe₂O₃

112 g of iron will burn to produce 112 * 143 g = 160 g of iron oxide

224 g of iron will burn to produce 224 * 1.43 = 320 g of iron oxide

168 g of iron will burn to produce 168 * 1.43 = 240 g of iron oxide

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Answer:

I'm pretty sure by type and size (I might be wrong).

Answer:

The answer is carbon and silicon

Option C) RbOH, HBr cannot be mixed together to form a buffer solution is Correct. A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it.

The ability of a solution to resist changes in pH is determined by the concentrations of the weak acids and bases present in the solution, as well as the concentration of the strong acid or base that is added to the solution. The weak acids and bases present in a buffer solution react with the strong acid or base to form a salt and water. The salt and water react to neutralize the strong acid or base, maintaining the pH of the solution.

In the case of RbOH and HBr, the weak base, RbOH, and the weak acid, HBr, cannot react with each other to form a salt and water. Therefore, they cannot form a buffer solution. The other pairs of solutions can form a buffer solution if the concentrations of the weak acids and bases present in the solutions are appropriate and the strong acid or base is added in the appropriate concentration.

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Answer:

28.69 grams

Explanation:

To find the mass, we first need to find the moles. Once we have the moles, it is easy to use the molar mass of H2SO4 to find its mass.

To find the moles, remember that molarity (M) is equal to the moles divided by the volume (L). The volume HAS TO be converted to liters!

M = moles / V

5.85 M = moles / 0.05 L

moles = 0.2925

Now we know that we have 0.2925 moles of sulfuric acid. The molar mass of sulfuric acid is 98.08 g/mol.

0.2925 moles * (98.08 g / mol) = 28.69 grams

Make sense? If you have any questions, don't hesitate to ask!

Answer:

V = 4/3 * 3.1416 * (37x10-10)3

V = 2.12x10-25 cm3

d = m/V

d = 1.67x10-24 / 2.12x10-25 = 7.87 g/cm3

The difference in temperature, let's convert F to ºC:

ºC = -80-32/1.8 = -62.22 ºC

dT = -92.6 + 62.2 = -30.4 ºC

The number of hydrogen atoms lined up side to side to make 1.00 inch is equal to 3.43 × 10⁷ atoms when the radius of one H-atom is 37 pm.

The atomic radius of a hydrogen atom is the distance between the center of the nucleus to the boundary of the electron that surrounds it.

Given, the radius of the hydrogen atom = 37pm

Then the diameter of the hydrogen atom = 37 + 37 = 74 pm

We know that 1 pm = 10⁻¹¹ m

Then the diameter of the one H - atom =  74 × 10⁻¹¹ m

The value of 1 m = 100 cm then the diameter of H-atom =  74 × 10⁻⁹ cm

As we know, the value of one inch = 2.52 cm

So, if 74 × 10⁻⁹ cm length takes H-atom = 1

Then, 2.52 cm would take hydrogen atoms = 2.52/  74 × 10⁻⁹ = 3.43 × 10⁷

Therefore, 3.43 × 10⁷ hydrogen atoms lined up side to side to make 1.00 inch.

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Explanation:

Any orbital can hold a maximum of 2 electrons with opposite spin. The first shell has one 1s orbital and holds 2 electrons. The second shell holds 8 electrons; 2 in a 2s orbital and 6 in three 2p orbitals. The third shell holds 18 electrons; 2 in a 3s orbital; 6 in three 3p orbitals; and 10 in five 3d orbitals.

In an atom which contains all the shells up to 3s filled, there will be 12 electrons.

According to the Aufbau principle, the s sub-shell can contain 2 electrons and the p sub-shell can contain 6 electrons.

The atom in which the shells up to 3s are filled, must have 1s, 2s, 2p and 3s orbitals filled.

Therefore, the total number of electrons present in the atom = number of electrons present in 1s + number of electrons in 2s + number of electrons in 2p + number of electrons in 3s.

Total number of electrons in the atom = 2 (electrons from 1s) + 2 (electrons from 2s) + 6 (electrons from 2p) + 2 (electrons from 3s).

Total number of electrons in the atom = 12

So, an atom which has all the shells up to 3s sub-shells filled contains 12 electrons.

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Answer:

43.1atm is the pressure using gas law and 27.2atm using Van der Waals Law.

Explanation:

Ideal gas law is:

PV = nRT

Where P is pressure in atm

V is volume = 4.00L

n are moles of the gas (For chlorine Molar Mass: 70.90g/mol):

500g * (1mol / 70.90g) = 7.052 moles

R is gas constant = 0.082atmL/molK

T is absolute temperature = 25°C + 273 = 298K

To solve the pressure, P:

P = nRT/V

P = 7.052mol*0.082atmL/molK*298K / 4.00L

P = 43.1atm is the pressure using gas law.

Van der Waals equation is:

\(P + a(\frac{n}{V})^2 * (V-nb) = nRT\)

Where a is 6.58L²atm*mol⁻²

b = 0.056Lmol⁻²

Solving for pressure:

\(P + a(\frac{n}{V})^2 = \frac{nRT}{(V-nb)}\)

\(P = \frac{nRT}{(V-nb)}-a(\frac{n}{V})^2\)

\(P = \frac{7.052mol*0.082atmL/molK*298K}{(4.00L-7.052mol*0.056L*mol)}-6.58L^2mol^{-2}(\frac{7.052mol}{4.00L})^2\)

P = 172.323 / 3.6051 - 20.4866

P = 27.2atm using Van der Waals Law

If an aluminum manufacturer does not bear the entire cost of the smoke it emits, it will.

release more smoke than what is socially acceptable.

Smoke is a mixture of airborne gases and particulates released during the combustion or pyrolysis of a substance, along with the amount of air entrained or otherwise mixed into the mass. It is frequently a waste product of fires, such as those caused by stoves, candles, internal combustion engines, oil lamps, and fireplaces, but it can also be used for other purposes, such as fumigation, communication, military defensive and offensive capabilities, cooking, or smoking (tobacco, cannabis, etc.). It is utilized in ceremonies when sage, resin, or incense are burned to create a scent for occult or spiritual purposes. It can also function as a preservative and flavor.

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Answer:

it drops?

Explanation:

Answer:

4.41 × 10²⁴ molecules SO₂

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

[Given] 7.32 moles SO₂

[Solve] molecules SO₂

Step 2: Identify Conversions

Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

4.4081 × 10²⁴ molecules SO₂ ≈ 4.41 × 10²⁴ molecules SO₂

Answer:

4.41 × 10²⁴ molecules SO₂

Explanation:

The Person is right