High-temperature superconducting oxides hold great promise in the utility, transportation, and computer industries.
(b) Another common superconducting oxide is made by heating a mixture of barium carbonate, copper(II) oxide, and yttrium(III) oxide, followed by further heating in O₂:
4BaCO₃(s) + 6CuO(s) + Y₂O₃(s) → 2YBa₂Cu₃O₆.₅ (s) + 4CO₂ (g)
2YBa₂Cu₃O₆.₅ (s) + 1/2 O₂ (g) → 2YBa₂Cu₃O₇(s)
When equal masses of the three reactants are heated, which reactant is limiting?

Answer

Explanation

The given balanced half-reaction for an acidic solution:

What to find:

Tha balanced half-reaction for a basic solution.

Step-by-step-solution:

To balance the half-reaction for a basic solution;

1. Add OH⁻ ions to BOTH SIDES to neutralize any H⁺

2. Combine H+ and OH- to make H2O.

3. Simplify by canceling out excess H2O

4. Balance the charges by adding e-

I₂ is a solid, Br₂ is a liquid, while Cl₂ and F₂ are gases because of their increasing molecular size and decreasing strength of their intermolecular forces.

The main factor influencing the physical states of halogens is the strength of the intermolecular forces (Van der Waals forces) between their molecules.

As you move down Group 17 in the periodic table (from F₂ to I₂), the size and mass of the halogen molecules increase. Larger molecules have a greater number of electrons, leading to stronger dispersion forces (a type of Van der Waals forces) between molecules.

For I₂, these forces are strong enough to hold the molecules together in a solid form. For Br₂, the forces are slightly weaker but still strong enough to form a liquid. However, in Cl₂ and F₂, the forces are weaker, allowing the molecules to be in a gaseous state at room temperature.

In summary, the physical states of the halogens depend on the strength of their intermolecular forces, which is influenced by the size and mass of the molecules.

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Answer:

A

Explanation:

Chemical bonds form when the valence electrons of one atom interact with the valence electrons of another atom.

Answer:

B. Moderately active metal

Explanation:

Answer

                    Explanation:O2 = 1.7×10-3M;

N2 = 6.4×10-3M;

NO = 1.1 10-5M.

Answer: 1s= 11

2s=11 2p= 11,11,11

3s=11 3p=11,1,1

Explanation:

The statement, that describes the electrons in the sulfur atom in the orbital diagram is "\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}\)"

Electron can be referred as subatomic particle containing negative charge on it.

Orbital diagrams are graphical representations of electrons in an atom. Three rules can be used to create orbital diagrams. Each electron, according to the Aufbau Principle, occupies the lowest energy orbital. According to the Pauli Exclusion Principle, only two electrons can fit into a single orbital.

The next two electrons will enter the 2s orbital, followed by the following six electrons, which will enter the 2p orbital because the p subshell can store up to six electrons. The following two electrons will enter the 3s orbital, and the final four electrons will enter the 3p orbital. As an outcome, the Sulphur electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}\)

Hence the correct answer is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}\).

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Answer:

start moving faster

Explanation:

i would guess because they slow down our freeze when they get cold

Answer:

a The molecules of the water in the teacup

hope it helps

6CO2 + 6H2O → C6H12O6 + 6O2

glucose produced = 1/6 x 23.6 = 3.93 moles

Answer:59/150

Explanation:

Answer:

Measuring distances to stars through stellar parallax. Measuring distances to stars through the moving cluster method. Astronomers measure the temperature of a star by looking at the star's color and its spectrum. The apparent brightness of a star tells how bright it seems to us

Explanation:

Answer:

Analyze the Characteristics of a Star

Explanation:

Surface Temperature

First, you want to determine the color of the star - this can determine the heat and age of the star.

Second, you want to measure the spectrum and get the spectral type.

Chemical Composition

Determine which lines are present in the spectrum.

Luminosity

Measure the apparent brightness and compensate for distance

Radical Velocity

Measure the Doppler shift in the spectrum.

Rotation

Measure the width of spectral lines.

Mass

Measure the period and radial velocity curves of spectroscopic binary stars.

Diameter

1. Measure the way a star’s light is blocked by the Moon.

2. Measure the light curves and Doppler shifts for eclipsing binary stars.

Answer:

you will get 17.983 g of lithium for every 100 g of lithium phosphate.

Explanation:

69.7%  is the percent by mass of Lithium in  Li\(_3\)PO\(_3\). A percent is obtained by multiplying the result by 100.

One approach to show the concentration for an element within a compound or component in a combination is as a mass percentage. The mass percentage is computed by dividing the total weight of the combination by the mass of each component and multiplying the result by 100%. The mass percent is calculated by dividing the mass that contains the compound and solute by the mass for the element or solute.

99.795g/mol = molar mass of  Li\(_3\)PO\(_3\)

6.94g/mol = molar mass of Li

mass percentage of Li=(molar mass of Li/molar mass of Li\(_3\)PO\(_3\))×  100

=(6.94/99.7)×  100

=69.7%

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To find the pH of the solution, we need to first calculate the concentration of H+ ions in the solution using the dissociation constant (Ka) of hydrocyanic acid. Therefore, the correct option is (d) 4.699.

The dissociation reaction of HCN is: HCN ⇌ H+ + CN-

The expression for the Ka is: Ka = [H+][CN-]/[HCN]

We are given the Ka value as 4.0 x 10^-10, the concentration of HCN as 0.445 M, and we assume the concentration of [CN-] is negligible compared to [HCN].

Therefore, we can write: Ka = [H+][CN-]/[HCN] ≈ [H+]^2/[HCN]

Solving for [H+], we get: [H+] = sqrt(Ka x [HCN]) = sqrt(4.0 x 10^-10 x 0.445) = 1.881 x 10^-6 M

Now, we can calculate the pH using the equation: pH = -log[H+]

Substituting the value of [H+], we get: pH = -log(1.881 x 10^-6) ≈ 4.699

Therefore, the correct answer is (d) 4.699.

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Heat flow refers to the transfer of thermal energy between two objects with different temperatures.

Heat flows from a hotter object to a cooler object until they reach thermal equilibrium and have the same temperature. This transfer can occur through conduction, convection, or radiation. Heat flow plays a fundamental role in many areas of science and technology, including thermodynamics, heat transfer, and climate science.

The correct match of the heat flow and its transmission is:

Radiation: Waves

Conduction: Direct contact

Convection: Liquid or gas

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Answer:

High melting point.

Explanation:

An example of a high melting point would be: 4215 K (3942 °C, 7128 °F).

Answer:

High melting point.

Explanation:

Answer:

1. 4

2. 2

3. 3

4. 1

Explanation: just did it on edge 2021

Answer:

one.) 4

two.) 2

three.) 3

four.) 1

The lower acidity is property aspirin have that salicylic acid does not have. So, option (d) is right one.

Aspirin is insoluble in water, so aspirin precipitates when water is added. Some other compounds, acetic anhydride and acetic acid, are soluble in water, but salicylic acid is sparingly soluble in cold water. For this reason, it is also called 2-hydroxybenzoic acid.

The lower solubility of salicylic acid in water compared to aspirin is due to the intramolecular hydrogen bonding in S.A. molecules around many heavy molecules (water) and dissolve each SA molecule, so that more molecules of solvent (water) is required to surround and solvate each S.A. molecule. Hence, salicylic acid is less acidic than aspirin.

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Complete question:

Read the article and answer the question. Aspirin Which property does aspirin have that salicylic acid does not have?

a) ability to dull pain

b) lower solubility

c) lower acidity

Based on the structure of meta-hydroxyacetophenone and para-hydroxyacetophenone, we can make an assessment of their relative acidity. In both compounds, the hydroxyl group (OH) is attached to the phenyl ring. The position of the hydroxyl group relative to the acetophenone moiety is what distinguishes the two isomers.

In meta-hydroxyacetophenone, the hydroxyl group is attached to the meta position, which means it is three carbons away from the carbonyl group (C=O). In para-hydroxyacetophenone, the hydroxyl group is attached to the para position, meaning it is directly opposite the carbonyl group.The acidity of a phenolic compound is influenced by the stability of the phenoxide ion formed when the hydroxyl group loses a proton (H+). The stability of the phenoxide ion is affected by the electron density and resonance stabilization in the phenyl ring.In the case of para-hydroxyacetophenone, the para position allows for greater electron delocalization and resonance stabilization within the phenyl ring. This increased stability of the phenoxide ion makes para-hydroxyacetophenone more acidic than meta-hydroxyacetophenone.
Therefore, we would expect para-hydroxyacetophenone to be more acidic than meta-hydroxyacetophenone due to the enhanced resonance stabilization of the phenoxide ion in the para position.

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The physical property that would make a mineral appropriate to use as an abrasive is hardness.

A mineral with a high level of hardness is able to resist being scratched or abraded, which makes it ideal for use in abrasive applications such as sandpaper. Some minerals that are commonly used as abrasives include diamond, corundum, and garnet. These minerals have a high level of hardness and are able to effectively remove material from a surface through the process of scratching or cutting. The choice of which mineral to use will depend on factors such as the type of material being worked on and the level of abrasiveness required.

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Answer:

To calculate the specific heat of the rock, you can use the formula for heat transfer: Q = mcΔT, where Q is the heat transferred, m is the mass of the substance, c is the specific heat capacity and ΔT is the change in temperature.

In this case, we can assume that the heat lost by the rock is equal to the heat gained by the water. Therefore:

Q(rock) = Q(water)

m(rock)c(rock)(T(final) - T(initial, rock)) = m(water)c(water)(T(final) - T(initial, water))

where m(rock) = 6.7 g, T(initial, rock) = 100.0°C, T(final) = 45°C, m(water) = 100.0 g (assuming the density of water is 1 g/mL), c(water) = 4.18 J/g°C (specific heat capacity of water), and T(initial, water) = 23°C.

Substituting these values into the equation above and solving for c(rock), we get:

c(rock) = (m(water)c(water)(T(final) - T(initial, water))) / (m(rock)(T(final) - T(initial, rock)))

c(rock) = (100.0 g * 4.18 J/g°C * (45°C - 23°C)) / (6.7 g * (45°C - 100.0°C))

c(rock) ≈ 1.26 J/g°C

So the specific heat of the rock is approximately 1.26 J/g°C.

Answer:

0.07 g/s.

Explanation:

From the question given above, the following data were obtained:

Mass lost = 9.85 g

Time taken = 2 min 30 s

Mean rate =?

Next, we shall convert 2 min 30 s to seconds (s). This can be obtained as follow:

1 min = 60 s

Thus,

2 min = 2 × 60 = 120 s

Therefore,

2 min 30 s = 120 s + 30 s = 150 s

Finally, we shall determine the mean rate of the reaction. This can be obtained as illustrated below:

Mass lost = 9.85 g

Time taken = 150 s

Mean rate =?

Mean rate = mass lost / time taken

Mean rate = 9.85 / 150

Mean rate = 0.07 g/s

Therefore, the mean rate of the reaction is 0.07 g/s

Answer: The balanced chemical equation is \(2NaNO_{3}(s) + Heat \rightarrow 2NaNO_{2}(s) + O_{2}(g)\) and it is a decomposition chemical reaction.

Explanation:

A chemical reaction in which single compound is decomposed into two or more species is called a decomposition reaction.

For example, \(NaNO_{3}(s) + Heat \rightarrow NaNO_{2}(s) + O_{2}(g)\)

As the compound \(NaNO_{3}\) is decomposing to given two different substances. So, it is a decomposition reaction.

Here, the number of atoms on reactant side are as follows.

The number of atoms on product side are as follows.

To balance this equation, multiply \(NaNO_{3}\) by 2 on reactant side and multiply  \(NaNO_{2}\) by 2 on product side. Therefore, the equation will be rewritten as follows.

\(2NaNO_{3}(s) + Heat \rightarrow 2NaNO_{2}(s) + O_{2}(g)\)

Here, number of atoms on reactant side are as follows.

The number of atoms on product side are as follows.

Hence, this equation is balanced.

Thus, we can conclude that the balanced chemical equation is \(2NaNO_{3}(s) + Heat \rightarrow 2NaNO_{2}(s) + O_{2}(g)\) and it is a decomposition chemical reaction.

Answer:

The versions of an element with different neutrons have different masses and are called isotopes. The average atomic mass for an element is calculated by summing the masses of the element's isotopes, each multiplied by its natural abundance on Earth.

Explanation:

The volume of this piece of oak wood is 7.93 cubic centimeters.

Density is defined as the mass per unit volume of a substance. The mass of the piece of oak wood is given as 7.31 g and the density is given as 0.921 g/cm³.

We can use the formula for density to find the volume of the piece of oak wood, which is given as: [Density = frac{Mass}{Volume}]

Rearranging the formula, we get:

[Volume = frac{Mass}{Density}]Substituting the given values, we get:

[Volume = frac{7.31 g}{0.921 g/cm³}]

Volume = 7.9271772058 cm³

Rounding to 3 significant digits, we get the volume of the piece of oak wood as:

Volume = 7.93 cm³

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The correct abbreviation for each metric unit is:

Kilogram - kg, Milliliter - ml, Kilometer- Km, Meter- m, Millimeter - mm, Centimeter - cm, Gram - g,  Liter - L, and Milligram - mg.

The metric system can be described as a system of measurement that succeeded the decimalized system based on the meter.  Each of the fundamental dimensions can be expressed by a single base unit of measure.

For quantities derived from the base units of the system, units derived from the base units are used such as the square meter being the derived unit for the area, a quantity derived from length.

Metric units can be described as units based on the meter, gram, or second and decimal multiples or sub-multiples of these. The units of the International System of Units (SI). By extension, they involve units of electromagnetism from the CGS units and SI units systems.

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Answer:

I think B is the answer so hope

Answer:

It's C

Explanation:

Answer:

A) 250 ml

Explanation:

Vcyl= π • r2 • h -----> Vcyl= π· 0.9^2 · 6=  15.2681402964464 x 16.4 millimetres = 250.3975008617209 rounded off to 250 millimetres :)