select the correct answer ​

The solution to the equation and value of variable 21(3d - 4) + 100 = 58 is d = 2/3.

Solve the equation 21(3d - 4) + 100 = 58, we can begin by simplifying and isolating the variable:

21(3d - 4) + 100 = 58

Distribute 21 to the terms inside the parentheses:

63d - 84 + 100 = 58

Combine like terms:

63d + 16 = 58

Subtract 16 from both sides:

63d = 42

Divide both sides by 63:

d = 42/63

Simplifying the fraction gives:

d = 2/3

The solution to the equation is d = 2/3.

The solution to the equation 21(3d - 4) + 100 = 58 is d = 2/3. By simplifying the equation, we find that dividing both sides by 63 results in the solution of d = 2/3, which satisfies the original equation.

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c3h4c3

its the smallest number of atoms , so divide all values by 2 as that is the largest common factor of 6 and 8.

Three different molecular movements, including translational, rotational, and vibrational motions, are feasible for unrestrained gas molecules.

Unrestrained gas molecules have three separate types of motion: vibration, rotation, and translation. Translation describes a full molecule travelling linearly in space. A molecule in rotational motion revolves around the core of its mass. Vibrational motion is created by the atoms' internal oscillations within the molecule.

According to the principles of thermodynamics and statistical mechanics, these three motions work together to form the overall behaviour and properties of gas molecules, such as temperature, pressure, and heat capacity.

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To calculate the total pressure in the flask, we need to convert all the partial pressures to the same unit and then add them together. We can convert the partial pressures of oxygen and ammonia to atm using the following conversions:

1 atm = 760 torr

1 atm = 101.325 kPa

Partial pressure of oxygen in atm = 643 torr / 760 torr/atm = 0.846 atm

Partial pressure of ammonia in atm = 2865 kPa / 101.325 kPa/atm = 28.27 atm

Now we can add up all the partial pressures in atm:

Total pressure in atm = Nitrogen partial pressure in atm + Oxygen partial pressure in atm + Ammonia partial pressure in atm

Total pressure in atm = 9.84 atm + 0.846 atm + 28.27 atm

Total pressure in atm = 38.956 atm

Therefore, the total pressure in the flask is 38.956 atm (rounded to three decimal places).

The side mirrors play an important role in providing the safety of a car and also help the drivers to see the vehicles behind the car. Most of the side mirrors have a small heating element in them which helps to defrost or deice.

When ice, snow or even just condensation builds up on your mirror, it can severely limit your visibility. The frost makes the smooth surface of the mirror rough, so that the parallel rays are reflected in different directions.

There are extensive and multiple refractions which cause the distortion of light and so that the frost looks white, whereas ice is clear also called black ice due to the colour of road surface.

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Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, the moles and number of molecules of ibuprofen is 0.15moles and 9.03×10²²molecules respectively.

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

given mass of ibuprofen= 33 g

Molar mass of ibuprofen= 206.29 g/mol

mole of ibuprofen=33 g ÷ 206.29 g/mol

mole of ibuprofen=0.15moles

number of atoms/molecules=number of moles × 6.022×10²³(Avogadro number)

number of atoms/molecules of ibuprofen= 0.15× 6.022×10²³

                                                                   =9.03×10²²molecules

Therefore, the moles and number of molecules of ibuprofen is 0.15moles and 9.03×10²²molecules respectively.

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The molarity of 25.00 grams of powdered AgNO3 added to 500.00mL of pure water is 0.29 mol/L

From the question, we are to determine the molarity of the solution prepared.

First, we will determine the number of moles of AgNO₃ present.

Using the formula,

\(Number\ of\ moles = \frac{Mass}{Molar\ mass}\)

From the given information,

Mass = 25.00 g

Molar mass = 169.874 g/mole

Number of moles = \(\frac{25.00}{169.874}\)

Number of moles of AgNO₃ present = 0.147168 mole

Now, for the molarity of the solution

\(Molarity = \frac{Number\ of\ moles}{Volume}\)

From the given information,

Volume = 500.00 mL = 0.5 L

Molarity = \(\frac{0.147168}{0.5}\)

Molarity = 0.294336

Molarity ≅ 0.29 mol/L

Hence, the molarity of 25.00 grams of powdered AgNO3 added to 500.00mL of pure water is 0.29 mol/L

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Answer:

solar flares

Explanation:

We have that  The outward transportation of sun rays by the rising of hot plasma and sinking of cooler plasma is Known as

Option D

From the question we are told

In the outer layer of the sun, energy is transported outward by the rising of hot plasma and sinking of cooler plasma. This transfer is known as __

Generally

When the sun give off Heat energy it does this by the rising of hot plasma and sinking of cooler plasma  

This Process is defined by scientist around the world as Solar flares and this

is the reason why the rays if the sun reaches earth.

Therefore

The outward transportation of sun rays by the rising of hot plasma and sinking of cooler plasma is Known as

Solar flares

Option D

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Answer:

Differences in melting points between graphite and butter is how their atoms are fixed structurally. Graphite consists of carbon atoms that have covalent bonding with a compact hexagonal arrangement that gives a lot of stability to the compound and makes its melting point elevated to approximately 3500oC.

The allotropes of carbon are diamond and graphite. The allotropes can have same or different physical or chemical properties. Therefore,  differences in melting points between graphite and butter is due difference in structure.

Allotropy is a property by which an element exist in more than one form. The different forms of element are called allotropes.

The features of graphite are :

1.Graphite form strong covalent bonds.

2. Graphite has delocalized electrons but they don't have metallic bonding.

3. There are total four electrons per carbon but only three electrons are available for covalent bond. One electron per carbon is responsible for delocalization.

4. Graphite forms a giant structures.

Graphite consists of carbon atoms that have covalent bonding with a compact hexagonal arrangement that gives a lot of stability to the compound and makes its melting point elevated.

Therefore, differences in melting points between graphite and butter is due difference in structure.

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Polar molecules' poles point in the direction of the oppositely charged metal plate when they are sandwiched between the plates.

Positive and negative poles are found in opposite poles in polar molecules. For instance, water molecules will have their negative pole facing the positive end and vice versa when they are placed between two metal plates that have opposing charges.

The charges on the metal plate will force them to align themselves since opposing charges repel one another and like charges attract.

Therefore, when polar molecules are sandwiched between two metal plates with opposing charges, the poles will point in the direction of the plate with the opposite charge.

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Answer:

a. He is as wise as his sister. (change into Negative)

⇒Neither he is wise nor his sister.

b. He put the cup on the shelf. (change into interrogative)

⇒Did he put the cup on the shelf?

c. He said to her. Will you play tomorrow? (change into indirect)

⇒He asked me that whether I play the next day.

d. Doctors cure patients. (Change into passive)

⇒Patients were cured by doctors.

e. She (not eat) yet. (Rewrite it using correct tense)

⇒she hadn't eaten yet.

f. Everybody has eaten..............? (use correct question tag)​

⇒Everybody has eaten, haven't they?

The medication can treat people who have the disease described. According to the commercial, the drug has FDA approval to treat a condition whose symptoms are listed.

Additionally, the narrator notes that the medication only comes with a prescription and has 1% of the active substance. We can deduce from this information that the drug can effectively treat persons who have the condition generating these symptoms, but obtaining it requires a prescription. The commercial provides no support for the other possibilities.

Therefore, the correct option is D.

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The correct sequence of events in cholesterol synthesis is HMG –CoA > phosphomevalonate > isopentenyl pyrophosphate > dimethylallyl pyrophosphate > geranyl pyrophosphate > farnesyl pyrophosphate > squalene > lanosterol > cholesterol.  

HMG-CoA: The precursor of cholesterol is HMG-CoA (3-hydroxy-3-methylglutaryl-coenzyme A). The synthesis of HMG-CoA occurs in the cytoplasm of cells.

Isopentenyl pyrophosphate: HMG-CoA undergoes a series of reactions to form mevalonate. Isopentenyl pyrophosphate is formed from mevalonate by the conversion of mevalonate to mevalonate-5-phosphate.

Dimethylallyl pyrophosphate: Isopentenyl pyrophosphate condenses with dimethylallyl pyrophosphate to produce geranyl pyrophosphate.

Geranyl pyrophosphate: Geranyl pyrophosphate is transformed into farnesyl pyrophosphate by the addition of another molecule of isopentenyl pyrophosphate.

Farnesyl pyrophosphate: Farnesyl pyrophosphate is transformed into squalene by the removal of two phosphate groups.

Squalene: Two squalene molecules join together to form the first cyclic intermediate, lanosterol.

Lanosterol: Lanosterol is then transformed into cholesterol through a series of reactions.

Therefore, the correct option among the given options in the question is HMG –CoA > phosphomevalonate > squalene >farnesyl pyrophosphate.

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Answer:

The correct answer is -

3. Butyne

4. Pentene

Explanation:

The names of such organic compounds are classified on the number of the carbon atoms and based on a number these prefixes are attached -

Meth - one carbon

Eth - two carbons

Prop - three carbons

But - four carbons

Pent - five carbons, and so on

The bonds can be identified by names of an organic compound by their suffixes -

- ane = single bond

- ene = double bond

-yne = triple bond

Thus, for question 3, carbon numbers are 4 and triple bond so Butyne, and similarly for question 4, 5 carbon atoms and double bond so Pentene.

Answer:

Computer Models are used to study the complex phenomena in the universe.

Explanation:

The term 'models' can be defined as a representation of something that is real. A model is used to learn the phenomena of the natural world for easy understanding of it.

The computer models are used to study the large and complex data in the universe. These models are used to perform various calculations that, in real, would take years to do. It helps in studying the changes in variables, which in turn helps the scientist to know of any climatic change, or other changes in the nature.

By using the oxidation number approach, find the solution to the equation Zn + HNO3 4Zn(NO3)2 Plus N2O + H2O.

Chemical Reaction Type: We only have one displacement reaction for this reaction. Balanced Approaches: By employing diluted HNO3, the reaction between HNO3 with Zn will result in Zn(NO3) + H2.

Balanced Approaches: You have a displacement reaction reaction in this zinc and water reaction. Cold water does not cause the response to occur. Water must be scorching hot or at least very hot. The number the hydrogen atoms just on output side of the formula must be correctly counted in order to balance the equation.

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Answer:

You can find in the given attachemnet

In both cases, the precipitates were AgCl and PbI2 respectively.

A precipitate is a solid product obtained from the reaction of two aqueous phase species. Let us now consider the two reactions listed in the question;

We can see that in both cases, the precipitates were AgCl and PbI2 respectively.

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Answer:

B and B

Explanation:

edge 2022

Answer:

thermal and light energy

In a molecule of CH₄, the hydrogen atoms are spatially tetrahedron-shaped. The correct answer is option (a).

In the methane (CH₄) molecule, the carbon atom is in the center, and the four hydrogen atoms are positioned around it. Because of the four electron pairs surrounding the carbon atom, the CH₄ molecule is tetrahedral. The carbon atom has four valence electrons that share with hydrogen to form four single covalent bonds, resulting in a complete outer electron shell for the carbon atom and a complete outer electron shell for the hydrogen atoms.

The electron-pair geometry is tetrahedral, while the molecular geometry is also tetrahedral. The methane molecule's tetrahedral geometry is determined by the arrangement of the carbon and hydrogen atoms.

Thus, in a molecule of CH₄, the hydrogen atoms are spatially tetrahedron-shaped. The correct answer is option (a).

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Chemical equations must be balanced, which requires that the quantity and type of atoms on both sides of the reaction arrow be equal.

Sulphur trioxide = SO_3

Sulfuric acid = H_2SO_4

SO 3(g) + H2O (l)   ---> H2SO4 (aq)

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Answer:

\( \small \sf Answer \rightarrow Mercury \: is \: easier \: to \: warm. \)

Explanation:

Specific Heat:

The specific Heat of any material is the heat absorbed or evolved by the material to raise or fall it's temperature by 1°C per unit mass of the material.

The heat absorbed or evolved (Q) is directly proportional to the mass of substance(m) and rise or fall of temp(∆T)

The general formula for specific heat is,

\( \sf \: \: \: \: \: s = \frac{Q}{\Delta T} \)

Now coming to your question,

The specific heat of ethanol is 2.443 J/g °C

& specific heat of mercury is 0.14 J/g ° C

The definition states that, if the specific heat would be more, more amount of heat will be required for per unit change in temperature and the corresponding substance will be difficult to warm. Similarly, substance with high specific heat won't warm as fast as substance with less specific heat.

Hence mercury will be easier to warm up compared to ethanol, and this could a reason to why Mercury is the only metal liquid at room temperature, because it have less specific heat!

\( \small \sf Answer \rightarrow Mercury \: is \: easier \: to \: warm \: to \: a \: high \: temperature.\)

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Answer:

c

Explanation:

coniferous trees, Tianga also called Boreal forest biome (major life zone).

hope it's perfect.

Answer: C is correct.

The risk assessment team, consisting of various members from different departments within the winery, conducted a comprehensive assessment of the potential risks associated with sulfur dioxide (SO2) and dimethyl dicarbonate (DMDC) operations.

Data was collected regarding the equipment, chemicals, procedures, training, incident history, and physical attributes of the workplace. The team also interviewed employees to gather their experiences, concerns, and suggestions.

After reviewing the collected information, the team identified the potential risks of fatalities or serious incidents related to workplace exposures of SO2 and DMDC. These risks were considered of utmost priority and required immediate control to ensure an acceptable level of safety. The consultant highlighted the importance of addressing these serious risks, as fatality and serious incident rates have not shown a decline and demand serious attention.

Factors contributing to the potential for environmental releases, explosions, and disasters were identified, including unusual and nonroutine work, nonproduction tasks, facility modification or construction activities, shutdowns and startups for repair and maintenance tasks, exposure to high-energy sources (such as electrical, steam, pneumatic, chemical), and situations transitioning from normal to abnormal (upsets).

Based on the assessment and the identified risks, it is crucial for the winery to implement effective control measures to minimize the potential for fatalities, serious incidents, and environmental disasters. These measures may include improving procedures, enhancing operator training, implementing stricter safety protocols, and ensuring proper handling and storage of chemicals.

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The density of 55.3 lbs/ft³ is 0.884 g/mL.

To convert density from pounds per cubic foot (lbs/ft³) to grams per milliliter (g/mL), we can use the following conversion factors:

1 pound = 453.59237 grams

1 foot = 30.48 centimeters (cm)

1 inch = 2.54 centimeters (cm)

1 milliliter (mL) = 1 cubic centimeter (cm³)

First, we convert pounds to grams:

55.3 lbs = 55.3 lbs * 453.59237 g/lb = 25050.364 grams

Next, we convert cubic feet to milliliters:

1 ft³ = (30.48 cm)³ = 28316.8466 cm³

1 cm³ = 1 mL

Finally, we calculate the density in g/mL:

Density = (25050.364 g) / (28316.8466 mL) ≈ 0.884 g/mL

Therefore, the density of 55.3 lbs/ft³ is approximately 0.884 g/mL.

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The statements wrong about cathode rays is none of the given option. All the given option is true about the cathode rays.

The statements for the cathode rays is given as :

A. They travel in straight lines towards cathode. This statement is true about the cathode rays.

B. They produce heating effect. This statement is true about the cathode rays.

C. They carry negative charge. This statement is true about the cathode rays.

D. They produce X-rays when strike with material having high atomic masses. This statement is true about the cathode rays.

Thus, none of the option is incorrect about the cathode rays.

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The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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The mole ratio of NaNO₃ to Pb(NO₃)2 is 2:1. Therefore, 6.75 g of Pb(NO₃)₂ will produce 2 x 6.75 g = 13.5 g of NaNO₃.

Mole is a unit of measurement used in chemistry to measure the amount of a substance, usually expressed in terms of the number of atoms, molecules, or other units in a given mass of that substance. The mole, also known as Avogadro's number, is a very large number equal to 6.022 x 10^23. This means that a mole of a substance contains 6.022 x 10^23 atoms or molecules, depending on the substance. The mole is used to measure the amount of a substance in a given sample, and is essential to many chemical calculations.

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Answer:

a solution with high amount of hydrogen ions is called an acidic solution