Please help me thank u❤️

Answer:

it would be 100 km/hr

Explanation:

if you divide each speed by the time you get 100 each time

Answer:

According to the numbers 1-5;Aluminium,Mercury,Oxygen,Stainless Steel,Hydrogen gas.

Explanation:

Answer:

I believe the answer is A (changes in air temperature  result in differences in air pressure which causes wind). Hope this helps

Explanation:

it might be porous materials

Answer:

Air had the highest rate of absorption.  Air absorbs most of the suns heat and sun rays and air can move to different areas which are warm and colder.

Explanation:

I hope it's helpful!!

According to the data 0.855 moles Mg(OH)₂ has in 0.05 kg from substance.

Add the number of moles to the substance's molecular weight. The molecular weight of a substance determines how many grams there are in a mole and provides a conversion factor from moles to grams for that specific substance. 1 mol H2O x 18.02 g/mol = 18.02 g, or 18.02 grams, is the mass of one mole of water.

1 kg = 1000g

We can convert 0.05 kg to grams

0.05 * 1000 = 50 grams

Then Find moles of Mg(OH)₂

1 grams Mg(OH)₂ is equal to 0.0171 mole

Then 50 grams Mg(OH)₂ is :

50 * 0.0171 = 0.855 moles

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Answer:

D. Physical weathering

Explanation:

Since the rocks are not changing their composition unlike the chemical one cause it changes their composition and weakens them too

(a) The work done by the nitrogen against external pressure is 126.66 J.

(b) The change in the internal energy of the system is -2,466.66 J.

The given parameters:

The molar mass of the given compound is calculated as follows;

NaN₃ = 23+ (14 x 3) = 65 g/mol

65 g -------------- 42

2.25 g ------------- ?

\(= \frac{2.25 \times 42}{65} \\\\= 1.45 \ g\)

The volume of the nitrogen gas is calculated as follows;

\(\rho = \frac{m}{V} \\\\V = \frac{m}{\rho} \\\\V = \frac{1.45}{1.165} \\\\V = 1.25 \ L\)

\(V = 0.00125 \ m^3\)

The work done by the nitrogen against external pressure is calculated as follows;

\(W = PV\\\\W = 101325 \times 0.00125\\\\W = 126.66 \ J\)

The change in the internal energy of the system is calculated by applying first law of thermodynamics as follows;

\(\Delta E = Q - W\\\\\Delta E = (-2,340) - (126.66)\\\\\Delta E = -2,466.66 \ J\)

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Answer:

three atoms = 1 water molecule

3 × 6 = 18 atoms

................

Based on the specific rotation value of -31.5 deg.mL/dmig for cholesterol, the correct statement is option B. Cholesterol is levorotatory.

Specific rotation is a measure of the angle by which plane-polarized light is rotated when it passes through a sample of a chiral compound.

In the case of cholesterol, the specific rotation value of -31.5 deg.mL/dmig indicates that it is levorotatory.

Levorotatory compounds rotate plane-polarized light in a counterclockwise direction, which is represented by a negative sign in the specific rotation value.

In conclusion, the specific rotation value of -31.5 deg.mL/dmig indicates that cholesterol is levorotatory. Option B is the correct answer.

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The given question is in an inappropriate manner. The correct question is:

Cholesterol has a specific rotation of -31.5 deg.mL/dmig. Based on this information, select all statements that are true about cholesterol.

A. None of the other statements are correct.

B. Cholesterol is levorotatory.

C. Cholesterol has an R-configuration.

D. Cholesterol is dextrorotatory.

E. Cholesterol has an S-configuration.

a) The volume of the reactor V0 using the mass balance equation and then use the rate of reaction equation to calculate the reactor size is 66.67 ft³ b) 10 reactors are required for the process to be arranged in series.

Given information:
Rate of feed =100 cfh
Cso=1.5 lbmol/ft³
Forward reaction rate, k=10
Equilibrium constant, Ke=16
Equilibrium conversion= 80%
CT=CU= ½(1.5-CS)
-rS=k[(Cs)² – 0.25(1.5-Cs)²/ke]a) Reactor size calculation:

Let’s use the mass balance equation for the process taking place in the Continuous Stirred Tank Reactor,

Therefore, F = V_0 (C_s)_o

Where, F is the flow rate

V_0 is the volume of the reactor(C_s)_o is the concentration of the reactant initially

This is a reversible reaction that occurs in a Continuous Stirred Tank Reactor or a CSTR. It follows the reaction equation of 2S ⇆ T+U .

Using equilibrium data, we know that the required conversion is 80%. That is, Xeq=0.8Using the equilibrium data equation, we can relate the concentrations of T, U, and S as follows:

[T][U]/[S]²= Ke=16Where,[T], [U] and [S] are the molar concentration of the respective species.

Now, let's use the rate equation for the forward reaction to relate the concentration of S to the rate of the reaction.-r_S=k[(C_S)²-0.25(1.5-C_S)²/Ke]

Now, applying the steady-state assumption, dC_S/dt=0, and considering the fact that CT=CU=0.5(1.5-CS), we can substitute (C_S) with C_T and simplify the rate equation.-r_S=k[((C_T)²-0.25(1.5-C_T)²/Ke)]

Now we can calculate the rate of reaction from the rate equation.

-r_S=k[((C_T)²-0.25(1.5-C_T)²/Ke)]=k[((0.5(1.5-C_T))²-0.25(1.5-0.5(1.5-C_T))²/Ke)]

We can find the volume of the reactor V0 using the mass balance equation and then use the rate of reaction equation to calculate the reactor size.

Therefore,V0=F/(C_S)_o=100/(1.5)=66.67 ft³

So, the reactor size is 66.67 ft³.b) For a given feed rate and the size of the reactors, we can calculate the number of reactors required for the process to be arranged in series using the following equation: N=V1/V2

where, V1 and V2 are the volumes of the reactor in the series.

So, if we want to design an arrangement of vessels having 1/10 the size, we can calculate the size of each reactor in the series.V2=V1/10=6.667 ft³

Now, we can find the number of reactors using the equation: N=V1/V2=66.67/6.667=10

Thus, 10 reactors are required for the process to be arranged in series.

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Answer:

A través del Experimento de Rutherford.

Explanation:

El experimento de la lámina de oro fue realizado en 1909 por Ernest Marsden y Hans Geiger bajo el liderazgo de Ernest Rutherford. En este experimento, se bombardeó una lámina de oro con partículas alfa y se detectó su dispersión. Se encontró que una pequeña proporción de las partículas regresan cerca de la fuente. Estos resultados fueron la base para el lanzamiento de un nuevo modelo atómico con un núcleo central cargado positivamente y con electrones cargados negativamente con pequeñas masas en relación con el núcleo y distribuidos a su alrededor.

The number of the molecules of water is 1.8 g is  6.02 * 10^22 molecules.

We can be able to obtain the molecules from the Avogadro's number. We know that the number of the molecules that we find in the compound can be gotten by the use of the proposition that was put forward by Avogadro.

Number of moles of the water = 1.8g/18 g/mol = 0.1 moles

We know that;

1 mole of water contains 6.02 * 10^23 molecules of water

0.1 moles of water would contain 0.1 mole * 6.02 * 10^23 molecules/ 1 mole

= 6.02 * 10^22 molecules

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Fish are fascinating creatures that have adapted to survive and thrive in diverse aquatic environments, making them a crucial and captivating part of our planet's biodiversity.

Fish are a diverse group of aquatic vertebrates characterized by their ability to extract oxygen from water through gills. They possess streamlined bodies and fins that enable them to navigate and swim efficiently in their watery habitats. From small, colorful tropical fish found in coral reefs to large, predatory species like sharks, fish occupy various niches in aquatic ecosystems.

Fish exhibit a wide range of adaptations, such as camouflage, schooling behavior, and specialized feeding structures, allowing them to thrive in different environments and exploit various food sources. They play vital roles in food webs as both predators and prey, contributing to the overall balance and stability of aquatic ecosystems.

Additionally, fish have a remarkable array of colors and patterns, serving purposes such as attracting mates, warning predators, or blending into their surroundings for protection. They also display various reproductive strategies, including external and internal fertilization, live birth, and egg-laying.

Overall, fish are fascinating creatures that have adapted to survive and thrive in diverse aquatic environments, making them a crucial and captivating part of our planet's biodiversity.

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The range of vapor pressures in different liquids at the same temperature can be explained in terms of entropy and enthalpy. Liquids with weaker intermolecular forces tend to have higher vapor pressures due to higher entropy, while liquids with stronger intermolecular forces tend to have lower vapor pressures due to lower enthalpy.

Different liquids have widely differing vapor pressures at the same temperature due to variations in their intermolecular forces and the degree of dispersal between the liquid and gaseous states.

The vapor pressure of a liquid is the pressure exerted by its vapor when it is in equilibrium with its liquid phase at a given temperature. It depends on the attractive intermolecular forces between the molecules and the extent to which the liquid molecules can escape into the gas phase.

1. Entropy: Entropy is a measure of the disorder or randomness in a system. Liquids with weaker intermolecular forces have higher entropy because the molecules are more free to move and disperse. These liquids tend to have higher vapor pressures at a given temperature because the molecules can more easily overcome the attractive forces and enter the gas phase.

2. Enthalpy: Enthalpy is a measure of the total energy of a system. Liquids with stronger intermolecular forces have lower enthalpy because more energy is required to break the attractive forces and convert the liquid into a gas. These liquids tend to have lower vapor pressures at a given temperature because fewer molecules can overcome the attractive forces and enter the gas phase.

For example, consider two liquids: water and ethanol. Water has strong hydrogen bonding between its molecules, resulting in lower entropy and higher enthalpy. As a result, water has a lower vapor pressure at a given temperature compared to ethanol, which has weaker intermolecular forces. Ethanol has higher entropy and lower enthalpy, allowing more molecules to escape into the gas phase and resulting in a higher vapor pressure.

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The structure of an ionic compound depends on the relative sizes of the cations and anions. Ionic compounds includes salts, oxides, hydroxides, etc. Among the given options, the compound CaCI₂ is an ionic compound. The correct option is D.

The compounds which are held together by ionic bonds are termed as the Ionic compounds. Metals and non-metals generally react to form ionic compounds. In a reaction between metals and non-metals, metals loose electrons to complete their octet.

Ionic compounds are crystalline solids which are formed by neatly packed ions of opposite charge. Here CaCI₂ is made up of Ca²⁺ and chloride (Cl⁻) ions.

Thus the correct option is D.

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To determine the number of moles of the gaseous organic compound, we can use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we need to convert the density to mass per volume. The density of the gas is given as 340g/L. Therefore, the mass of 1 L of the gas is 340 g.

Next, we need to use the ideal gas law to calculate the number of moles. We know that the pressure is 1.7 atm, the temperature is 45°C (which is 318 K), and the volume can be calculated using the density and the molar mass of the compound. The molar mass can be determined from the molecular formula of the compound.

Assuming the compound is a hydrocarbon, we can use an average molar mass of 28. Thus, the volume of 1 mole of the gas can be calculated as follows:

V = (molar mass/density) × 1000 ml/L = (28/340) × 1000 = 82.35 ml/mol

Using the ideal gas law equation and plugging in the given values, we get:

n = (PV) / (RT) = (1.7 atm × 82.35 ml) / (0.0821 L atm/mol K ×318 K) = 0.839 mol

Therefore, the number of moles of the gaseous organic compound is 0.839 mol

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Tear hyperosmolarity refers to the increased concentration of solutes in tears, which can occur in both aqueous-deficient dry eye (ADDE) and evaporative dry eye (EDE).

In both cases, tear osmolarity is influenced by tear evaporation.
In ADDE, tear hyperosmolarity arises due to a decreased production of tears. When the lacrimal glands fail to produce enough tears, the remaining tears evaporate more rapidly, leading to an increased concentration of solutes in the tears. This results in tear hyperosmolarity.

In EDE, tear hyperosmolarity arises due to increased tear evaporation from the ocular surface. Factors such as a disrupted tear film lipid layer or reduced blinking can lead to increased evaporation, causing an increase in tear osmolarity.It is important to note that while tear hyperosmolarity is associated with both ADDE and EDE, not all forms of dry eye are evaporative. There are other subtypes of dry eye, such as aqueous-deficient and mixed dry eye, where tear hyperosmolarity may not be primarily driven by evaporation.

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Answer:

118 g of Ar; 28.8 g of \(NO_{2}\)

Explanation:

To convert from moles to grams, you simply multiply by the atomic mass. So the conversion table looks as follows:

\(\frac{2.95 mol}{1} *\frac{39.95 g}{1 mol}\)

The mol units cancel, and you are left with 118 g of Argon (117.8525 without sig-figs).

As for the next part of our problem, the first thing we need to do is find the molar mass of \(NO_{2}\). e can do this by adding the weight of all the atoms within the compound:

N + 2(O) = (14.01) + 2(16) = 46.01 g

Then, we repeat the above process, except we use the molar mass we just found instead of the atomic weight:

\(\frac{0.627 mol}{1}*\frac{46.01 g}{1 mol}\)

Once again, the mol units cancel, and we are left with 28.8 g of \(NO_{2}\) (28.84827 before sig-figs).

Answer: a. 65.37 mL
b. 5.3 cm
c. 2.08 km (plus) or 1.64 km (minus)
d. 18°C (plus) or 16°C (minus)

Explanation:

The way significant figures work when you're adding or subtracting, is you go to the answer with the least amount of decimal places. Take a. for example; you have 65.316 (3 places after the decimal) and 0.05 (2 places after the decimal place). Based off of this, you would round your answer to two places after the decimal. And when you have a whole number, like in d. you round to the nearest whole number, since there aren't any decimal places to round your answer to.

A LOAEL is defined as the lowest dose that demonstrates a significant increase in an observable adverse effect. The term LOAEL stands for "Lowest Observed Adverse Effect Level."

When testing chemicals and other substances for toxicity, the goal is to determine the concentration or dose at which adverse effects begin to appear. The LOAEL is the lowest dose at which an adverse effect is observed. This value can be used to establish a safe level of exposure to a substance.
To determine the LOAEL, a series of tests are conducted in which different doses of the substance being tested are administered to test animals. The animals are observed for any adverse effects, such as changes in behavior, weight loss, or organ damage. The lowest dose at which an adverse effect is observed is the LOAEL.
It is important to note that the LOAEL is a relative measure of toxicity. It only provides information on the dose at which an adverse effect is first observed and not on the severity of the effect. In addition, the LOAEL may vary depending on the species tested and other factors.
In summary, the LOAEL is the lowest dose at which an observable adverse effect is detected. This value is used to establish a safe level of exposure to a substance.

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Answer:

V = 18,493.5114 cm³

Explanation:

Dimensions are;

L = 35 inches

W = 35 cm

H = 0.065 yards

Now, volume is given by;

V = LWH

But our dimensions need to all be in the same unit, so let's convert to cm.

L = 35 inches = 35 × 2.54 cm = 88.9 cm

H = 0.065 yards = 0.065 × 91.44 = 5.9436 cm

Thus;

V = 88.9 × 35 × 5.9436

V = 18,493.5114 cm³

The pH of a solution after 400.0 ml of 0.200 m hydrochloric acid, HCl, has been titrated with 0 ml, 320.0 ml, and 500.0 ml of 0.250 m sodium hydroxide, NaOH is 1.63.

The equation for the reaction is-

HCl + NaOH → NaCl + H₂O

Since, the number of moles of HCl is less than NaOH. Therefore, HCl is limiting, and the excess of NaOH is reacted with H₂O,

NaOH → Na+ + OH-

Here, mole of HCl = 0.4 × 0.2 = 0.08 mol

For NaOH added: 0.08 mol HCl requires 0.08 mol of NaOH for complete neutralization

0.08 - 0.08 = 0 mol of NaOH is left after the reaction with 320.0 mL

0.08 - 0.125 = -0.045 mol of NaOH left, which is not possible.

Hence, NaOH is completely reacted with 500.0 mL of HCl.

The concentration of HCl is 0.2 m, and the number of moles of HCl is 0.08 mol. Thus, 0.08 ÷ 0.4 = 0.2 M, the concentration of HCl remaining.

Then,0.125 mol of NaOH reacts with 0.08 mol of HCl.

Therefore, the moles of NaOH left with 320.0 mL = 0.125 - 0.08 = 0.045

The moles of NaOH remaining after 500 mL of HCl are reacted with NaOH = 0 mol. Thus, we can add up the moles of NaOH added to the total, which is 0.125 + 0.045 + 0 = 0.17 moles.

The concentration of NaOH is 0.25 M, and the volume of NaOH is 0.17 L, which yields 0.0425 moles of NaOH.

So, OH- concentration = moles of NaOH/total volume= 0.0425 / (0.4 + 0.32 + 0.5) L= 0.0425 / 1.22 L= 0.0348 M
pH = 14 - pOH = 14 - (- log 0.0348)= 14 + 1.46= 1.63

Therefore, the  pH is 1.63.

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Answer:

because you cant

Explanation:

The following changes affect the value of the equilibrium constant for a gas-phase exothermic reaction:

Addition of a catalyst-  Increase equilibrium constant

Decrease in the temperature - Decrease equilibrium constant

Removal of a product- No effect on equilibrium constant

Decrease in the volume- Decrease equilibrium constant

Removal of a reactant- Decrease equilibrium constant

Define  exothermic process

An exothermic process in thermodynamics is a thermodynamic process or reaction that releases energy from the system to its surroundings, typically in the form of heat but occasionally in the form of light (such as a spark, flame, or flash), electricity (such as from a battery), or sound (such as the explosion produced by the burning of hydrogen).

The relationship between a reaction's products and reactants with regard to a certain unit is expressed by the equilibrium constant, K. The equilibrium constant is temperature-dependent and unaffected by the precise ratios of reactants to products, the presence of a catalyst, or the presence of inert substances. Additionally, it is unaffected by the volumes, pressures, and concentrations of the reactants and products.

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Answer:

Start with the temperature in Fahrenheit (e.g., 100 degrees).

Subtract 30 from this figure (e.g., 100 - 30 = 70).

Divide your answer by 2 (e.g., 70 / 2 = 35).

Answer:

5.9 × 10² kJ

Explanation:

When carbon disulfide, CS₂, forms from its elements, heat is absorbed. The corresponding value for the standard enthalpy of formation of carbon disulfide is 117.36 kJ/mol. The thermochemical equation that represents this process is:

C(graphite) + 2 S(s, rhombic) ⇒ CS₂(g)   ΔH°f = 117.36 kJ/mol

117.36 kJ of heat are absorbed when 1 mole of CS₂ is formed. The amount of heat absorbed when 5.0 moles of CS₂ are formed is:

5.0 mol × 117.36 kJ/mol = 5.9 × 10² kJ

Answer:

1.46 X 10^24 fu Na2CO3

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 1.42×10²⁴ formula units are present in 256.3 g sodium carbonate.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

mole =given mass ÷ molar mass

Molar mass of 1 mole of sodium carbonate= 107.87 g/mol

mass of sodium carbonate=256.3 g

mole =256.3 g ÷ 107.87 g/mol

        =2.37moles

number of formula units of sodium carbonate=number of moles of sodium carbonate× 6.022×10²³

number of formula units of sodium carbonate=2.37moles× 6.022×10²³

number of formula units of sodium carbonate=1.42×10²⁴

Therefore, 1.42×10²⁴ formula units are present in 256.3 g sodium carbonate.

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Answer:

For any multicellular organism to survive, different cells must work together. The right type of cell must be in the right place to do the work that needs to be done. Organization starts with the cell. Cells in multicellular organisms are specialized for a specific function.

Explanation:

Answer:

Cells in multicellular organisms are organised into tissues and tissues are organised into organs, organs are organised into organ system, and finally, organ systems are organised into an organism

Item 12 a student mixes 40. Ml of 0. 10mhbr(aq) with 60. Ml. The [oh−] of the resulting solution is 0.02.

A solution is a mixture of two or more than two substances.

The reaction is \(\rm HBr + KOH = KBr + H_2O\)

To calculate the OH-

1 mole of HBr reacts with 1 mole of KOH

Moles of HBr = 40 mL × 0.1 M = 4 mm moles

Moles of KOH = 60 mL × 0.1 M = 6 m moles

Moles of [OH-] = 6 - 4 = 2 m moles

Volume of solution = 100 mL

[OH-] = 2mmoles/100 mL = 0.02 M

Thus, the [oh−] of the resulting solution is 0.02.

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