I NEED HELP ASAP Follow significant figures rules. Show your work (will be turned in later

A superconductor allows electricity to flow through it easily.

A superconductor is defined as a substance that offers no resistance to the electric current and transports electrons from one atom to another when it becomes colder than a critical temperature.

Superconductivity is a set of physical properties observed in some materials where electrical resistance becomes zero and magnetic flux fields are pushed out from the material. Some materials that exhibit this behavior are aluminum, magnesium diboride, niobium, copper oxide, yttrium barium, and iron pnictides.

Hence, the answer is Option A.

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. Propanamide is an organic compound with the molecular formula C3H7NO. It is a primary amide, which means it contains a carbonyl group (C=O) attached to an amino group (NH2) on a primary carbon atom (i.e., the carbon atom directly attached to the nitrogen atom).

Propanamide is a colorless to pale yellow liquid at room temperature and is commonly used as a solvent in the production of polymers, pharmaceuticals, and other industrial products.

b. 2-Aminopropanoic acid, also known as Alanine, is an α-amino acid with the molecular formula C3H7NO2. It is a nonpolar amino acid, which means it has a hydrophobic side chain (methyl group) and is commonly found in the interior of proteins. Alanine is important in protein synthesis and is also a source of energy for muscle tissues during exercise.

c. 2-Aminoethanoic acid, also known as Glycine, is an α-amino acid with the molecular formula C2H5NO2. It is the simplest amino acid and is the only one that is not optically active because its R-group is a hydrogen atom. Glycine is an important neurotransmitter in the central nervous system and is also used in the synthesis of proteins, purines, and heme.

d. Butanamide, also known as Butyramide or Butyramine, is an organic compound with the molecular formula C4H9NO. It is a primary amide that is commonly used as a precursor in the production of various chemicals and pharmaceuticals. Butanamide can be synthesized from butyric acid, which is a fatty acid found in milk, butter, and cheese. It is also found in some plant extracts and is a metabolite of the neurotransmitter GABA.

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The constituents of petroleum that are used for the following purposes are as follows:

The constituents of petroleum are LPG, bitumen, paraffin wax, lubricating oil, kerosene, diesel, etc. These compounds are a mixture of hydrocarbons.

Therefore, each constituent of petroleum that is used for the following purposes is mentioned above with proper names.

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The mass of ZnCl2 that can be produced is 0.496 g.

The balanced equation for the reaction between zinc (Zn) metal and hydrochloric acid (HCl) is: Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

The molar mass of Zn is 65.38 g/mol and the molar mass of ZnCl2 is 136.29 g/mol.

To determine the mass of ZnCl2 that can be produced from 0.238 g of Zn, we need to use stoichiometry.

To do this:

First, convert the given mass of Zn to moles by dividing by its molar mass: 0.238 g Zn × (1 mol Zn/65.38 g Zn) = 0.00364 mol Zn

Since the balanced equation shows that 1 mole of Zn reacts with 1 mole of ZnCl2, then the number of moles of ZnCl2 produced will be the same as the number of moles of Zn.

Thus,0.00364 mol ZnCl2 will be produced from 0.238 g Zn.

To convert the moles of ZnCl2 to grams, we multiply by its molar mass:0.00364 mol ZnCl2 × 136.29 g ZnCl2/mol ZnCl2 = 0.496 g ZnCl2

Therefore, the mass of ZnCl2 that can be produced is 0.496 g.

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Answer:

"it can help us explain the universe" or "it can help us study how cells in the body function"

Explanation:

you choose which one you want but their still both technicly right

Answer:

Helium and Neon

Explanation:

Semiconductor diodes are the current elements of laser pointers and are formed by a mixture of Gallium and Arsenic with very small amounts of other elements to obtain different wavelengths.

Laser pointers or pen light are inputs that emit collimated and colored laser radiation, which every day finds more applications in industry, ordinary life and research.

The first pointers were made with Helium and Neon but they were delicate and bulky, today they have been replaced by pointers with solid state diodes, depending on the material they can emit radiation from 1320 nm to 254 nm.

The most common materials for economically priced pointers that emit in the visible range (400 nm to 700 nm) are Gallium and Arsenic, in the GaAs semiconductor compound with 1.4 eV energy gap.

For the emission, a np union is created and depending on the doping, emission is achieved in a wide range of wavelengths.

In conclusion, semiconductor diodes are the current elements of laser pointers and are formed by a mixture of Gallium and Arsenic with very small amounts of other elements to obtain different wavelengths.

       Fundamental materials: Gallium and Arsenic

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The AH value for the combustion of ethane, as represented by the given balanced chemical equation, is -1560.6 kJ/mol. The energy is absorbed during this reaction.

In the balanced chemical equation provided, 2 moles of ethane (C₂H6) react with 7 moles of oxygen gas (O2) to produce 4 moles of carbon dioxide (CO₂) and 6 moles of water vapor (H₂O). The AH value represents the change in enthalpy, or heat, during the reaction per mole of reactant.

To determine the AH value, we can look at the coefficients of the reactants and products in the balanced equation. In this case, 2 moles of ethane react to produce 4 moles of carbon dioxide and 6 moles of water vapor. The AH value is calculated per mole of reactant, so we can divide the AH value by the number of moles of ethane (2) to get the AH value per mole of ethane.

The given value of -84.7 kJ is the AH value per mole of ethane, so we need to multiply it by the number of moles of ethane in the balanced equation (2) to get the total AH value for the reaction. Therefore, the AH value is -84.7 kJ/mol × 2 mol = -169.4 kJ.

However, it's important to note that the given AH value (-84.7 kJ) appears to be incorrect in the question. The actual value for the combustion of ethane is around -1560.6 kJ/mol. This value represents the energy released or absorbed during the reaction. In this case, the negative sign indicates that energy is absorbed, meaning the reaction is endothermic.

In summary, the AH value for the combustion of ethane is -1560.6 kJ/mol, and the energy is absorbed during the reaction.

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Answer:

Iron, Copper, Zinc, and Gold

Explanation:

in Table of elements

Iron was no. 26

Copper no. 29

Zinc no. 30

Gold no. 79

In carbon dioxide, carbon is bonded to two oxygen atoms by double bonds.

The atomic or hybrid orbitals that make up the bond between C and O in carbon dioxide are 150.

The covalent bonds in carbon dioxide are made up of one carbon atom and two oxygen atoms, with two double bonds. Carbon dioxide is an inorganic molecule that exists as a colorless and odorless gas at room temperature and standard pressure.

The carbon atom in the center of carbon dioxide's linear molecular structure has hybridized atomic orbitals called sp orbitals, which allow it to form two strong covalent bonds with the oxygen atoms by overlapping with two unpaired p orbitals on each oxygen atom.

In carbon dioxide, each oxygen atom forms two sigma bonds with the carbon atom. The carbon atom, on the other hand, employs hybridization in order to form these bonds.

There are two atoms involved in the formation of the carbon dioxide molecule:

carbon and oxygen.

The hybridization of carbon is sp, while that of each oxygen atom is sp2.

As a result, in carbon dioxide, carbon is bonded to two oxygen atoms by double bonds.

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The final volume, when 0.607 L of a 47.0% (m/v) solution is diluted to 24.0% (m/v), is approximately 1185.417 mL.

To find the final volume when a solution is diluted, we can use the equation;

C₁V₁ = C₂V₂

where; C₁ is the initial concentration

V₁ is the initial volume

C₂ is the final concentration

V₂ is the final volume

Given;

Initial volume (V₁) = 0.607 L

Initial concentration (C₁) = 47.0% (m/v)

Final concentration (C₂) = 24.0% (m/v)

We need to calculate the final volume (V₂) in milliliters (mL).

Convert the initial and final concentrations to decimal form;

C₁ = 47.0% = 0.47 (m/v)

C₂ = 24.0% = 0.24 (m/v)

Convert the initial volume from liters to milliliters;

V₁ = 0.607 L × 1000 mL/L = 607 mL

Rearrange the equation and solve for V₂;

C₁V₁ = C₂V₂

V₂ = (C₁V₁) / C₂

V₂ = (0.47 × 607) / 0.24

V₂ ≈ 1185.417 mL

Therefore, the final volume is 1185.417 mL.

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sorry the pic is blocked

The states of matter in which water exists are determined by the temperature and pressure of its environment.

Water can exist in three different states of matter - solid, liquid, and gas. When water is at a temperature below 0 degrees Celsius and at atmospheric pressure, it freezes and turns into a solid state, commonly known as ice. When the temperature of the water is above 0 degrees Celsius but below 100 degrees Celsius, it exists in its liquid state. This state of matter is the most common and familiar to us, as it is the form in which we typically use and consume water. When water is heated above 100 degrees Celsius, it turns into its gaseous state, which is commonly known as steam. Therefore, the states of matter in which water exists are determined by the temperature and pressure of its environment.

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In a parallel circuit with identical light bulbs, the true statement is option D Adding more identical light bulbs will not change their brightness.

Two bulbs in a simple parallel circuit every experience the overall voltage of the battery. that is why the bulbs in the parallel circuit might be brighter than the ones within the series circuit. some other gain to the parallel circuit is that if one loop is disconnected, then the other stays powered.

While batteries are connected in parallel, the voltage remains the same, but the contemporary which could float in the circuit will increase. when bulbs have equal power, then their resistance is likewise the same. while the 2d bulb connected in parallel to the first bulb is switched on, the effective resistance of the circuit turns into half of, and the present-day circuit becomes double. due to it, this double modern-day divides itself equally into bulbs.

The voltage across every resistor inside a parallel aggregate is precisely equal however the currents flowing through them are not the same as that is determined by their resistance fee and Ohms regulation.

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The surface water level would get decreased if the precipitation is low.

Prolonged low precipitation would lead to increased levels of dryness and heat. This leads to reduced levels of water content and moisture on the surface.

In a long term, this could be termed drought which is a climatic condition with extreme dryness and heat with the scarcity of water.

When the climatic condition gets dried up, the water level gets dried up and the levels get dropped.

In addition to that, the groundwater and aquifer levels also get decreased due to low precipitation. Then the levels of water table also get reduced substantially. Therefore, an intense reduction of precipitation would lead to lower levels of water.

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The sentence which describes one characteristic of nonmetals is nonmetals are brittle and ductile in nature.

Non-metals are those which warrant all the metallic attributes. They're good insulators of heat and electricity. They're substantially feasts and occasionally liquid. Some of also are indeed solid at room temperature like Carbon, Sulphur and phosphorus.

Brittleness describes the property of a material that fractures when subordinated to stress but has a little tendency to distort before rupture. Brittle accoutrements are characterized by little distortion, poor capacity to repel impact and vibration of cargo, high compressive strength, and low tensile strength.

A material's capability to suffer significant plastic distortion under tensile stress before rhapsody is called the ductile parcels of the material. The ductile accoutrements are nickel, etc.

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The mass of O₂ produced from 31.2 g H₂O(g) can be calculated using stoichiometry, and the answer is 17.6 g.


The given equation shows that 2 moles of water decompose to give 1 mole of oxygen gas. To find the mass of oxygen produced, we need to convert the given mass of water to moles, using its molar mass. The molar mass of water is 18 g/mol (2 x 1.01 g/mol for hydrogen + 16.00 g/mol for oxygen).  

So, 31.2 g of water is equivalent to 31.2/18 = 1.733 moles of water. From the equation, we see that 1 mole of oxygen is produced for every 2 moles of water decomposed. Therefore, the number of moles of oxygen produced is 1.733/2 = 0.8665 moles.  

Finally, we convert this number of moles to mass using the molar mass of oxygen, which is 32.00 g/mol. So, 0.8665 moles of oxygen is equivalent to 0.8665 x 32.00 = 27.73 g of oxygen. However, we need to consider significant figures and round off to the correct number of decimal places. Hence, the mass of O₂ produced is 17.6 g (rounded to two significant figures).

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To find the theoretical oxygen demand for the given solutions, we need to calculate the amount of oxygen required to completely oxidize the organic compounds present in each solution.

This can be determined by using the stoichiometry of the balanced chemical reactions representing the oxidation of the organic compounds.

a. Octanol (CH3(CH2)7OH)

The balanced chemical equation for the oxidation of octanol is as follows:

2C8H18 + 25O2 -> 16CO2 + 18H2O

From the balanced equation, we can see that for every 2 moles of octanol (C8H18), 25 moles of oxygen (O2) are required.

Given that the concentration of octanol is 200 mg/L, we can convert it to moles per liter:

200 mg/L * (1 g / 1000 mg) * (1 mol / molar mass of octanol)

Next, we can calculate the theoretical oxygen demand:

Oxygen demand = (moles of octanol) * (25 moles of oxygen / 2 moles of octanol)

b. Acetone (C3H6O)

The balanced chemical equation for the oxidation of acetone is as follows:

C3H6O + 4O2 -> 3CO2 + 3H2O

From the balanced equation, we can see that for every 1 mole of acetone (C3H6O), 4 moles of oxygen (O2) are required.

Given that the concentration of acetone is 90 mg/L, we can convert it to moles per liter:

90 mg/L * (1 g / 1000 mg) * (1 mol / molar mass of acetone)

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Answer:

the answer is air

Explanation:

Answer:

B. From the air

Explanation:

The volume that is occupied is 22.4 L

The mole allows for the conversion of the mass of a substance to the number of entities it contains, and vice versa, through the use of its molar mass, which is the mass of one mole of the substance. The mole is a convenient unit for expressing amounts of substances in chemical reactions, as it provides a way to relate the mass of a substance to its number of entities, such as atoms or molecules.

If one mole of oxygen contain 6.02 * 10^23 moles

x moles would contain 6.70 x 10^22 molecules

x = 1 mole

Then the volume that is occupies is 22.4 L

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Answer:

you should use the scientific name because it is the same everywhere in the world

Explanation:

the scientific name of anything and everything is the same around the world.

Quality single-case research designs should have a minimum of three demonstrations of effect.

Single-case research design (SCRD) is a research method that involves studying the behavior of a single participant. SCRD has several unique features that distinguish it from other types of research, and the design is suited for studying behavior in its natural context.

Quality SCRDs should have at least three demonstrations of effect (i.e., changes in the behavior of interest that are reliably linked to a specific intervention) in order to support causal inferences.

Each demonstration of effect must be replicated and analyzed statistically, and the demonstrations of effect must be separated by a return to baseline or another experimental condition that permits the investigator to demonstrate that the change in the behavior of interest is attributable to the intervention and not to extraneous factors.

SCRD is a powerful and flexible research technique that can be used to study behavior in a variety of settings and populations.

The application of SCRD can lead to a better understanding of the causes and maintenance of behavior and can guide the development of effective interventions for individuals with behavioral difficulties.

Hence, Quality single-case research designs should have a minimum of three demonstrations of effect.

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Answer: A. Cytoplasm

Explanation: Cytoplasm is a jelly, like material that fills up the remaining space in the cell. It is also responsible in making the shape of the cell. Without it, other parts of the cells or the organelles cannot make its function because it serves as the hallway of the transportation of the nutrients needed by each cell.

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This is because side reactions and unwanted byproducts are often favored at higher temperatures.

To avoid the formation of a side product in this experiment, the best approach would be to keep the reaction at a low temperature and avoid overheating the product during distillation. This is because side reactions and unwanted byproducts are often favored at higher temperatures. By maintaining a low temperature, the reaction can be controlled to favor the desired product and minimize the formation of side products.

Drying the aqueous layer, using pure sodium iodide, using pure silver nitrate, and venting the gases out of the separatory funnel are not specifically related to preventing the formation of side products in this context. They may be relevant for other aspects of the experiment, but they would not directly address the formation of side products.

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Answer:

  ≈ 0.6579 atm

Explanation:

The pressure in atmospheres is the ratio of the pressure on the mountain to one atmosphere, in corresponding units.

The pressure is ...

  500 /760 atm = 25/38 atm ≈ 0.6579 atm

Answer:

It comes from same parent material.

Explanation:

The two rocks have some similar minerals which indicates that they are comes from the same parent material but with the passage of time it is mixed with other minerals due to which they are some different in composition from one another so we can conclude that they comes from the same parent material due to the presence of some similar minerals.

Theoretical yield =0.15 g

% yield = 15%

reaction

C6H12O6 → 2C2H5OH + 2CO2

from above reaction, we get to know that,

1 mole of glucose → 2 mole ethanol

for 4 mole of glucose → 8 mole of ethanol

\frac{55.2}{8(46)} = yield of ethanol

yield of ethanol = 0.15g

% yield = (experimental/theoretical )*100

% yield of ethanol = 0.15 x 100 =15%

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Dilution of the solution can be calculated by the formula of the molarity and volume. The initial volume of 2.50 M solution was 30 mL.

Molar concentration or the dilution factor is in an inverse relationship and with an increase in the dilution, the molarity of the solution decreases.

Given,

Initial molarity = 2.50 M

initial volume = ?

Final molarity = 0.750 M

Final volume = 100.0 ml

Substituting values in the formula:

\(\begin{aligned}\rm V_{1} &= \rm \dfrac{M_{2}V_{2}}{M_{1}}\\\\&= \dfrac{0.750 \times 100}{2.50}\\\\&= 30 \;\rm mL\end{aligned}\)

Therefore, 30 mL was the initial volume of the solution before it was diluted.

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Answer:

The earlier bog bodies that were discovered in the 1600s might have not been preserved properly due to a lack of knowledge on how to preserve them or a lack of awareness of their significance. It is also possible that they might have decayed and decomposed over time and not survived till the present day. However, the bog bodies found after the late 1800s were preserved and studied extensively due to the increasing awareness and understanding of their historical and archaeological significance.

Explanation:

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