50 POINTS help me pls someone​

The part labeled a is radiation, the part labeled b is convection and the part labeled c is conduction.

Conduction heat transfer is the transfer of heat by means of molecular excitement within a material without bulk motion of the mater.

Heat transfer by convection is the process of heat transfer by the bulk movement of molecules within fluids such as gases and liquids.

Radiation heat transfer is a process where heat waves are emitted that may be absorbed, reflected, or transmitted through a colder body.

In the diagram;

Thus, the part labeled a is radiation, the part labeled b is convection and the part labeled c is conduction.

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The initial concentration of Fe3+ in equilibrium solution 1 is the same as the concentration of the Fe(NO3)3 solution used, which is 0.00200 M. This is because the volume of the solution does not change, so the concentration stays the same. Therefore, the answer is 0.00200.

Here is the step-by-step explanation:
1. Start with the given concentration of the Fe(NO3)3 solution: 0.00200 M
2. Since the volume of the solution does not change (5.00 mL of the original solution is used to make equilibrium solution 1), the concentration of Fe3+ in equilibrium solution 1 is the same as the concentration of the Fe(NO3)3 solution.
3. Therefore, the answer is 0.00200 M, without units or scientific notation, and with the correct number of significant figures.

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Based on the given bright-line spectra and the observed wavelengths in the mixture's spectrum, the elements G and J are the ones present in the mixture.

From the given bright-line spectra and the spectrum of the mixture, we can determine the elements present in the mixture by comparing the specific wavelengths observed. Examining the bright-line spectra, we can identify that G has a distinct wavelength at 650 nm, J at 600 nm, L at 550 nm, and M at 500 nm.

Looking at the spectrum of the mixture, we can observe two prominent wavelengths, 650 nm and 600 nm. These correspond to the wavelengths of G and J, respectively. Since the spectrum of the mixture does not exhibit the wavelengths specific to L (550 nm) or M (500 nm), we can conclude that only G and J are present in the mixture.

Therefore, based on the given bright-line spectra and the observed wavelengths in the mixture's spectrum, the elements G and J are the ones present in the mixture.

This analysis relies on the principle that each element has characteristic wavelengths at which they emit light. By comparing the observed wavelengths in the mixture's spectrum with those of the individual elements, we can determine the elements present in the mixture.

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Answer:

Explanation:

From the given information;

The objective is to draw the four possible stereoisomers of 3-bromo-4-fluorohexane.

Stereoisomerism is the difference of the spatial arrangement of atoms in a molecule or a compound with the same molecular formula.

For 3-bromo-4-fluorohexane, We have the stereoisomers as follows:

(3S, 4S)-3-bromo-4-fluorohexane

(3S,4R)-3-bromo-4-fluorohexane

(3R, 4R)-3-bromo-4-fluorohexane

(3R, 4S)-3-bromo-4-fluorohexane

The above four possible stereoisomers are drawn and can be seen in the file attached below  in a respective order.

The rate at which radioactive substances disintegrate is a constant for a

given radioactive material.

Reasons:

The half-life of a radioactive material is the time it takes half of the nucleus

of a radioactive material to disintegrate into other forms of materials

through the given off of energy and particles.

The half life of Uranium 235 = 710 million years

The product of the decay of Uranium 235 = Lead 207

The mass of Uranium 235 in the fossil = 4 micrograms

The mass of Lead 207 in the sample = 4 micrograms

Therefore, the mass of Lead 207 in the fossil is equal to the mass of

Uranium 235, therefore, a minimum of half of the Uranium 235 has

decomposed, which gives;

The time of decomposition of the Uranium 235 = 1 Half life = 710 million years

The age of the fossil = The time in which the Uranium has been

decomposing = The time of decomposition = 1 half life of Uranium 235 = 710

million years

Using the formula for half-life, we get;

\(\displaystyle N(t) = N_0 \left (\dfrac{1}{2} \right )^{\dfrac{t}{t_{1/2}}\)

The fossil contains initially only Uranium 235 with a minimum mass of 4 mg

+ 4 mg = 8 mg, which gives;

N₀ = 8 mg

N(t) = The current mass of Uranium 235 = 4 mg

\(\displaystyle t_{1/2}\) = 710 million years

\(\displaystyle 4 = 8 \cdot \left (\dfrac{1}{2} \right )^{\dfrac{t}{710}\)

\(\displaystyle \frac{4}{8} = \frac{1}{2} = \left (\dfrac{1}{2} \right )^{\dfrac{t}{710}\)

Therefore;

\(\displaystyle \left( \frac{1}{2}\right)^1 = \left (\dfrac{1}{2} \right )^{\dfrac{t}{710}\)

\(\displaystyle 1 = {\dfrac{t}{710}\)

t = 710

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If the gas is heated to 73.2 °C at constant volume 253.7 mmHg will its new pressure.

The rule that states that the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of a single gramme of an ideal gas.

Using the ideal gas law, we may assume that hydrogen is acting optimally as follows:

As the gas is being heated solely and the volume is not changing, thus, n and V are constant and hence we may state

(P1V1) / T1 = (P2V2) / T2

P1 / T1 = P2 / T2

We can then plug in the given values and solve for P2:

P1 = 237.46 mmHg

T1 = 50.6 + 273.15 = 323.75 K (temperature in Kelvin)

T2 = 73.2 + 273.15 = 346.35 K

P2 = P1 * T2 / T1

P2 = 237.46 * 346.35 / 323.75

P2 = 253.7 mmHg.

If the gas is heated to 73.2 °C at constant volume 253.7 mmHg will its new pressure.

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The valency of magnesium is 2 because it has two valence electrons in its outermost shell. Magnesium belongs to the second group of the periodic table, which means it has two electrons in its outermost shell or valence shell. In order to achieve a stable configuration, magnesium tends to lose these two valence electrons to form a positively charged ion with a charge of 2+. This makes magnesium a bivalent or divalent element with a valency of 2.

Answer:

Because the outer shell of magnesium contains 2 atoms

Answer:

When methyl violet is added to water the solution is violet in colour. When HCl is added, it turns dark yellow. Addition of NaOH turns the colour to violet again.

Explanation:

The sequence of colour changes outlined in the answer stems from Le Chaterliers principle.

The equilibrium set up in a solution of yellow violet is;

HMV (aq) ---------> H^+(aq) + MV^- (aq)

HMV is yellow in colour while MV^- is violet in colour. Addition of HMV to water leads to its dissolution and release of MV^- ion, hence the solution turns violet. Similarly, when HCl is added, H^+ concentration increases and HMV is formed again, hence the solution turns yellow. If NaOH is added, the solution becomes alkaline, the equilibrium shifts in favour of more MV^- and the solution turns violet again.

Adding sulfuric acid to water will decrease the pH dramatically.option 4.

Sulfuric acid is a strong acid and is a type of acid rain. When five drops of sulfuric acid are added to a sample of water, the pH of water will decrease dramatically. This is because sulfuric acid is a strong acid that is capable of dissociating completely in water, producing a high concentration of hydrogen ions (H+) and sulfate ions (SO4²-). This increase in hydrogen ion concentration lowers the pH of water and makes it more acidic.Acid rain is a type of rain that has a pH lower than 5.6, which is the normal pH of rainwater. The acidity of acid rain is caused by the presence of strong acids like sulfuric acid and nitric acid. These acids are produced when sulfur dioxide (SO2) and nitrogen oxides (NOx) are emitted into the atmosphere by human activities like burning fossil fuels and industrial processes.When these gases react with water, they form sulfuric acid and nitric acid, respectively, which then fall to the ground as acid rain.

Acid rain can have harmful effects on the environment, including the acidification of lakes and rivers, the degradation of forests and soils, and the corrosion of buildings and monuments.To conclude, when five drops of sulfuric acid are added to a sample of water, the pH of water will decrease dramatically.option 4.

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1) Diesel has a higher viscosity than petrol.

2) Petrol is more flammable than diesel.

3) The formula will be C₁₀H₂₂.

4) The equation is; 2C8H18+25O2→16CO2+18H2O.

Depending on the precise composition and temperature, the viscosity of gasoline and diesel can change. In general, diesel is more viscous than gasoline. Higher viscosity fluids are thicker and flow more slowly than lower viscosity fluids because viscosity relates to the resistance of a fluid to flow.

Diesel is less flammable than gasoline. The lowest temperature at which gasoline can evaporate and turn into an ignitable combination in air is known as its flash point, and it is lower for gasoline. Compared to diesel fuel, petrol vapors are much more flammable and can ignite at lower temperatures.

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The redox equation C6H12O6 + 6O2 -> 6H2O + 6CO2 represents the process of cellular respiration. Option C

Cellular respiration is a biochemical process that occurs in living organisms, including plants and animals, to convert organic compounds, such as glucose (C6H12O6), into usable energy in the form of adenosine triphosphate (ATP). It is the primary process by which cells derive energy to carry out their functions.

In the given equation, glucose (C6H12O6) is being oxidized, losing electrons, and releasing carbon dioxide (CO2) as a byproduct. This oxidation process results in the production of energy-rich molecules, such as ATP.

Additionally, oxygen (O2) is being reduced, accepting the electrons from glucose and combining with hydrogen (H) to form water (H2O). This reduction process allows for the transfer of electrons and the generation of energy.

The process of cellular respiration is essential for the survival and functioning of organisms, as it provides the necessary energy for various metabolic activities, growth, and maintenance of cellular processes.

It is a fundamental metabolic pathway found in both plants and animals, enabling them to extract energy from organic molecules through the oxidation of glucose or other fuel sources.

Therefore, option C, cellular respiration, is the correct answer that represents the process described by the given redox equation.

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Which of the following explains the VSEPR geometry of BeCl2?

The answer will be "It is linear because there are two bonds and no unbonded pairs of electrons"

Explanation:

The VSEPR theory determines the molecular shape of the molecule on the basis of Bond pair – Bond pair, Bond pair – Lone pair, and Lone pair- Lone pair repulsions. It also includes only valence shell electrons, which may be bonded or non-bonded.

According to the lewis structure of Beryllium chloride, Beryllium is a central atom and it has only two bond pairs.

Beryllium atom forms two bond pairs with two chlorine atoms, its general formula will be Linear.

We have the following chemical equarion:

The first thing we do is check if the equation is balanced. As we can see we have the same number of each element on each side of the equation, so it is balanced.

Now, we know that for every 3 moles of potassium oxide that react 3 moles of magnesium oxide are produced. Therefore if 12.5 moles of potassium oxide react, 12.5 moles of magnesium oxide will be produced.

To answer the question we have to calculate the mass. This we do by using the molecule's molar mass (M).

Magnesium oxide's molar mas is:

Now we calculate the mass (m):

So the answer is 503.75g

in test tube 1 iron nail gets both air and moisture which is required for rusting. ... in the test tube 3 iron nail is not rusted because of the calcium chloride which is moisture absorber. hence nail would not get moisture for the rusting.

Answer: This is a precipitation reaction: Zn 3(PO 4) 2 is the formed precipitate.

Explanation:

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- The phytoplankton that is dead become liquefied over time due to pressure, and oil deposits are formed.

- Fish produce oil as a waste product that eventually forms oil deposits.

The isotopes of bromine from the options would be Z = 35,  A = 79.

Isotopes are atoms of the same element with the same atomic number but different neutron numbers.

The atomic number of an atom is the number of protons present in the nucleus of the atom. Since elements are arranged according to their atomic number on the periodic table, isotopes of the same element will occupy the same position on the periodic table.

Now, considering the isotope of bromine (Br). The atomic number is 35. The atomic number is denoted as Z on the periodic table. The normal bromine atom has a mass number of 80. With 35 as the number of protons, the number of neutrons can be calculated as:

80 - 35 = 45.

Considering an atom with Z = 35, A = 79, means the atomic number is 35, which means it is a bromine atom. The mass number is 79 instead of 80.

79 - 35 = 44.

This means that the atom has 44 as the neutron number instead of 45. Thus, Z = 35, A = 79 is the only isotope of bromine.

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The best definition of crustal deformation is that it is the constructive force that is the result of the edges of Earth's crust pushing and pulling against each other.

Crustal deformation refers to the changes in the shape, position, and orientation of the Earth's crust due to the forces acting on it.

These forces can be compressional, tensional, or shear, and they cause the crust to buckle, fold, fault, and uplift.

Crustal deformation can result in the formation of new landforms, such as mountains, valleys, and plateaus, and can also cause earthquakes and volcanic eruptions.

Thus, the best definition of crustal deformation is that it is the constructive force that is the result of the edges of Earth's crust pushing and pulling against each other.

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Answer:

its A screw :))) your welcome

Answer:

nucleus

Explanation:

Answer:

Nucleus Is the control center of the cell

Explanation:

Hope it help

Answer:

combustion

Explanation:

Answer:

Divide by 100

Explanation:

The metal X has an approximate molar mass of 42.36 g/mol and the metal is most likely calcium.

The molar mass of the metal carbonate XCO₃ and identify the metal X, we need to calculate the number of moles of XCO₃ and CO₂ using the given masses and molar masses.

The molar mass of CO₂ (carbon dioxide) is 12.011 g/mol (for carbon) + 2 * 15.999 g/mol (for oxygen) = 44.01 g/mol.

The number of moles of CO₂ can be calculated using the formula:

moles of CO₂ = mass of CO₂ / molar mass of CO₂

moles of CO₂ = 0.855 g / 44.01 g/mol

moles of CO₂ ≈ 0.01944 mol

Since the reaction stoichiometry is 1:1 between XCO₃ and CO₂, the number of moles of XCO₃ is also approximately 0.01944 mol.

molar mass of XCO₃ = mass of XCO₃ / moles of XCO₃

molar mass of XCO₃ = 2.012 g / 0.01944 mol

molar mass of XCO₃ ≈ 103.38 g/mol

The molar mass of XCO₃ is approximately 103.38 g/mol.

To determine the metal X:

molar mass of X = molar mass of XCO3 - molar mass of CO3

molar mass of X = 103.38 g/mol - (12.011 g/mol + 3 * 15.999 g/mol)

molar mass of X ≈ 42.36 g/mol

Metal X is most likely Calcium that has a molar mass of 40 g/mol

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To solve this problem, we need to know a few things first:

We can solve it using the following formula: PV = nRT

where:

P = pressure

V = volume

n = number of moles

R = gas constant

T = temperature

We also know that n = m/MM

where:

m = mass

MM = molar mass

Step 1 - Let's find out the number of moles of the hydrogen gas

Step 2 - Transform all units into the unit of the gas constant R (0.082 atm.L/K.mol

Step 3 - use the formula PV = nRT to find out the pressure

Step 1:

MM of H2 = 1x2 = 2 g/mol

m = 89.10

n = 89.10/2

n = 44.55 moles

Step 2:

1000 mL = 1L

8,583 mL = 8.583 L

TK = Tc + 273.15

TK = 140 + 273.15

Tk = 413.15

Step 3:

PV = nRT

P x 8.583 = 44.55 x 0.082 x 413.15

P = 1,509.7/8.585

P = 175.8 atm

Answer: The answer is 175.8 atm

The volume of hydrogen gas produced in the reaction of 73 grams of zinc and 73 grams of hydrochloric acid (under normal conditions) is approximately 22.4 liters.

To calculate the volume of hydrogen gas produced in the reaction of zinc and hydrochloric acid, we need to use the principles of stoichiometry and the ideal gas law.

First, let's write the balanced chemical equation for the reaction between zinc (Zn) and hydrochloric acid (HCl):

Zn + 2HCl →\(ZnCl_2\)+ H2

From the equation, we can see that one mole of zinc reacts with two moles of hydrochloric acid to produce one mole of hydrogen gas. To determine the number of moles of zinc and hydrochloric acid, we need to convert the given masses into moles.

The molar mass of zinc (Zn) is approximately 65.38 g/mol, so 73 grams of zinc is equal to:

73 g Zn * (1 mol Zn / 65.38 g Zn) ≈ 1.116 mol Zn

Similarly, the molar mass of hydrochloric acid (HCl) is approximately 36.46 g/mol, so 73 grams of HCl is equal to:

73 g HCl * (1 mol HCl / 36.46 g HCl) ≈ 2.002 mol HCl

According to the balanced equation, the reaction produces one mole of hydrogen gas for every two moles of hydrochloric acid. Therefore, since we have 2.002 moles of HCl, we expect to produce half that amount, or approximately 1.001 moles of hydrogen gas.

To calculate the volume of hydrogen gas, we can use the ideal gas law, which states:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. In this case, we assume the reaction is conducted under normal conditions, which means a pressure of 1 atmosphere and a temperature of 273.15 Kelvin.

Rearranging the equation to solve for V, we have:

V = nRT / P

Substituting the values, we get:

V = (1.001 mol) * (0.0821 L·atm/(mol·K)) * (273.15 K) / (1 atm) ≈ 22.4 L

Therefore, the volume of hydrogen gas produced in the reaction is approximately 22.4 liters.

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The name given to the group delimited in the image is ethyl.

It is a hydrocarbon from the alkyl functional group.

Ethyl is a substituent derived from ethane. The formula for ethane is \(C_2H_6\), whereas, ethyl has one H less than ethane.

Thus, the formula for ethyl  is \(C_2H_5\).

Looking at the delimited portion of the image, 2 C atoms in C-C bond are bonded by 5 H atoms.

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