please help will make brainlyest answer fast please

Answer:

A structure whose sub-units occur in a constant ratio and are arranged in a repeating pattern; the sub-unit can be individual atoms or a molecule.

 Heterometallic systems Which employ multiple building units to produce extended structures.

And

Design and assessment of extended structures often require the generation of spatially variable earthquake motions to be used as multiple-support inputs.

Explanation:

Such As A Polymer For Instance.

A type of extended structure that is made of many smaller, repeating sub-units in a chain;  Although, The repeating sub-unit is a unique molecule. I Hope That This Answer Helps.

By using stoichiometry and considering the molar ratios from the balanced chemical equation, we find that reacting 15.8 g of H2 with excess oxygen will produce 141 g of water. 141 g.option A.

In the balanced chemical equation 2H2 + O2 → 2H2O, it is stated that two moles of hydrogen gas (H2) react with one mole of oxygen gas (O2) to produce two moles of water (H2O). Since the molar mass of water is approximately 18 g/mol, we can calculate the amount of water produced by converting the mass of hydrogen gas to moles and then using the mole ratio from the balanced equation.

To find the moles of hydrogen gas, we divide the given mass (15.8 g) by the molar mass of hydrogen (2 g/mol), which gives us 7.9 moles of H2. According to the balanced equation, each mole of H2 produces two moles of H2O. Therefore, 7.9 moles of H2 will produce 2 * 7.9 = 15.8 moles of H2O.

Finally, we convert the moles of water to grams by multiplying the moles (15.8) by the molar mass of water (18 g/mol), which gives us 284.4 g. However, we need to remember that the given reaction has excess oxygen, meaning all the hydrogen will react. Therefore, the limiting reactant is not hydrogen but oxygen.

Consequently, the amount of water produced will be based on the number of moles of oxygen. Since there is excess oxygen, we can assume that the moles of oxygen consumed are equal to the moles of hydrogen reacted. Therefore, the correct answer is 15.8 moles * 18 g/mol = 141 g.option A.

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The final concentration of \(Cu^{2+}\) in the solution is 1 × \(10^{-16} M\).

Given:

Concentration of \(Cu(NO_{3} )_{2}\) = 4.00 × \(10^{-4} M\)

rmen = 1.00 × \(10^{-3}M\)

Moles of \(Cu(NO_{3}) _{2}\) = 0.0004 mol

Moles of ethlenediamine = 0.001 mol

Kf for \(Cu(en)^{2+} _{2}\) = 1 ×\(10^{20}\)

From the fromula \(Cu(en)^{2+} _{2}\):

The mole ratio for \(Cu(NO_{3})_{2} : en = 2:1\)

so, moles of en = 0.0004 × 2 = 0.0008 moles

Now, remaining en moles = 0.001 - 0.0008 = 0.0002 moles

Now, using the formula \(Cu(en)^{2+} _{2}\):

0.0004 moles of \(Cu(NO_{3})_{2}\) reacted to form an equal 0.0004 moles of \(Cu(en)^{2+}_{2}\) as shown by equation below:

\(Cu^{2+} + 2en\) → \(Cu(en)^{2+} _{2}\)

1.0 ×\(10^{20}\) = \(\frac{0.0004}{(Cu^{2+) * (0.0002^{2+} )} }\)

Kf = \(\frac{Cu(en)^{2} _{2} }{(Cu^{2+}) (en^{2}) }\)

\(Cu^{2+} = \frac{0.0004}{(1.0 * 10^{20} * 4 * 10^{-7}) }\)

\(Cu^{2+} = 1 * 10^{-16} M\)

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per litre, denoted by the unit sign mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry.

Molarity is the sum of the solute's moles. litres of the solution. Since the volume of the solution will be measured in litres and the quantity of moles of solute is measured in mol. So, mol L – 1 is the unit of molarity.

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The complete question is:

A 1. 00-L solution contains 4. 00*10-4 M Cu(NO3)2 and 1. 00×10-7 Methylenediamine (en). The Kf for Cu(en)22 is 1. 00 x 1020. What is the final concentration of Cu2+ in the solution?

The reaction represents the law of conservation of mass (a balanced chemical equation :

2NaN₃ → 2Na + 3N₂

Conservation of mass applies to a closed system, where the masses before and after the reaction are the same, so balanced chemical equations show that mass is conserved in chemical reactions.

So we just have to look at the amount of each type of element present in the reactants and products must be the same

1. Hg + O₂ → HgO

not balanced, because element O not equal(2 in left, 1 in right)

2. 2NaN₃ → 2Na + 3N₂

balanced, because  element in reactant and product are the same

Na, left = 2, right=2

N, left =2x3=6, right=3x2=6

3. C+O → CO₂

not balanced, because element O not equal(1 in left, 2 in right)

4. CH₄ + O₂ → CO₂ +H₂O

not balanced, because element O and H not equal

The respective atomic number, mass number, protons, electrons and neutrons of the following atoms are as follows:

The atomic number of an element is the number of protons in the atom of that element. In a neutral atom, the number of protons is same as the number of electrons.

However, the mass number is the sum of the number of protons and neutrons in the atom.

This means that we can get the number of neutrons in an atom of an element by subtracting the number of protons/atomic number from the mass number.

Therefore, based on the above explanation, the respective atomic number, mass number, protons, electrons and neutrons of the following atoms are as follows:

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Answer:

B

Explanation:

Rubber is a resistor, which means it slows the electric current. Gloves with oil on them would be the least safe of all the options

Answer:

c. 1.0 mole C5H5N and 1.5 mole C5H5NHCl

Explanation:

We can determine pH of a buffer using H-H equation:

pH = pKa + log [A⁻] / [HA]

Where [A⁻] is concentration of conjugate base and [HA] concentration of weak acid. These concentrations can be computed as moles of each species.

We need to determine pKa of both NH₃ and C₅H₅N buffers, thus:

pKb = -log Kb

NH₃ pKb = -log 1.8x10⁻⁵ = 4.74

C₅H₅N pKb = -log 1.7x10⁻⁹ = 8.77

And pKa = 14 - pKb:

NH₃ pKa = 14 - 4.74 = 9.26

C₅H₅N pKb = 14 - 8.77 = 5.23

A buffer works only under pH's between pKa-1 and pKa + 1. As pKa NH₃ buffer is 9.23 is not possible to produce a buffer with pH 5.05 for this system.

Thus, we only will compute the buffers made with C₅H₅N:

c. 1.0 mole C5H5N (Weak base) and 1.5 mole C5H5NHCl (Conjugate acid)

pH = pKa + log [A⁻] / [HA]

pH = 5.23+ log [1.0 moles] / 1.5 moles]

d. 1.5 mole C5H5N and 1.0 mole C5H5NHCl

pH = pKa + log [A⁻] / [HA]

pH = 5.23+ log [1.5 moles] / 1.0 moles]

Right solution is:

In an ecosystem, based on the data in the graph the current carbon

dioxide levels are  far higher than the highest natural levels..

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system.

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The given compound is a cis isomer as it has double bond and functional group present on same side.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

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There are 0.017 mm volume  hydrogen are formed at 715 mm hg and 19.0 deg c if 12.8 g of al react

The relationship between an object's mass and volume seems to be straightforward. The object's mass rises directly proportionately to its volume.

The given reaction is:

2 Al + 6 HCl → 2 alcl3 + 3 h2

It can be seen that, 3 mol of hydrogen is formed during the reaction.

Number of moles of hydrogen = 3

Mass = 12.8 g

d = 715 mmHg

Volume of hydrogen can be calculated as:

Density = mass /volume

Volume = mass / density

Put the values of given data in above expression.

Volume = 12.8 g  / 715 mm hg

Volume = 0.017 mm

Thus, volume of the hydrogen will be 0.017 mm

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The molarity of a solution of 12.9 g fructose and 31.0 g water is 1.26 M.

Molarity is the number of moles of solute dissolved in one liter of a solution. The formula to calculate molarity is:

Molarity (M) = moles of solute / liters of solution

To find the molarity of the given solution, we first need to determine the number of moles of fructose present. We can do this using the molar mass of fructose.

Molar mass of fructose = (6 x 12.01 g/mol) + (12 x 1.01 g/mol) + (6 x 16.00 g/mol)= 180.18 g/mol

The number of moles of fructose present in 12.9 g can be calculated as:

Number of moles of fructose = mass of fructose / molar mass of fructose= 12.9 g / 180.18 g/mol= 0.0716 mol

Number of moles of water = mass of water / molar mass of water= 31.0 g / 18.02 g/mol= 1.722 mol

Now, we can calculate the total volume of the solution.

Total mass of the solution = mass of fructose + mass of water= 12.9 g + 31.0 g= 43.9 g

We can convert this to liters using the density of water.

Density of water = 1 g/mL= 1000 g/L43.9 g = 0.0439 L (volume of solution)

Now that we know the number of moles of fructose and water and the volume of the solution, we can calculate the molarity:

Molarity (M) = moles of solute / liters of solution= 0.0716 mol / 0.0439 L= 1.26 M

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The answer to the appropriate number of significant figures is 6530.67.

Explanation:

When adding two numbers, the number of decimal places in the result should be the same as the number of decimal places in the number with the fewest decimal places. In this case, 6524 has no decimal places and 5.67 has two decimal places. Therefore, the answer should have two decimal places.

When adding whole numbers, the number of significant figures in the result should be the same as the number of significant figures in the number with the fewest significant figures. In this case, both numbers have four significant figures. Therefore, the answer should also have four significant figures.

Adding the two numbers gives:

6524
+ 5.67
-------
6530.67

Therefore, the answer to the appropriate number of significant figures is 6530.67.

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CIF will tend to increase as the reaction proceeds toward equilibrium.

Given that Kp is equal to 20 at 2500 K, we can calculate the initial concentrations of CIF using the ideal gas law. Let's assume the initial volume is 1 liter for simplicity.

For Cl2:

P(Cl2) = 0.18 atm

n(Cl2) = P(Cl2) * V / (RT) = 0.18 mol

For F2:

P(F2) = 0.31 atm

n(F2) = P(F2) * V / (RT) = 0.31 mol

For CIF:

P(CIF) = 0.92 atm

n(CIF) = P(CIF) * V / (RT) = 0.92 mol

Based on the balanced equation, for every 1 mole of CIF, 1 mole of Cl2 and 1 mole of F2 are consumed. Therefore, the initial moles of CIF are equal to the initial moles of Cl2 and F2.

Since the initial concentrations of CIF, Cl2, and F2 are the same, and the reaction is not at equilibrium, we can conclude that CIF will tend to increase as the reaction proceeds toward equilibrium. This is because the reaction favors the formation of CIF, as indicated by the value of Kp. As CIF forms, the concentrations of Cl2 and F2 decrease, driving the reaction in the forward direction to restore equilibrium.

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When an electron moves from a higher energy level to a lower energy level in an atom is called: electronic transition.

The jumping of the electron from  the one energy level to the another is called as the electronic transition.  When the electron moves from the high energy level to the lower one the atom emits the photon. A photon is the discrete amount of the light energy. The energy of the photon is same as the exact energy that will be lost by the electron that is moving to its the lower energy level.

When the electron drops from the higher energy level to the low energy level, then the energy is emitted in the form of the photon.

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Answer:

Number of Significant Figures: 4

The Significant Figures are 5 4 3 9

Explanation:

Copper class II connectors are designed to withstand a pull test of 890 newtons or 200 pounds of force. This test is performed to ensure that the connector can securely hold the wires or cables that it is intended to connect.

The pull test is conducted by applying a force perpendicular to the plane of the connector until it reaches the specified limit of 890 newtons. The connector should not break or come loose from the wires during the test. This test is important for ensuring the reliability and safety of electrical connections in various applications, including residential and industrial settings.
Copper Class II connectors are designed to be durable and reliable. They must withstand a pull test of 890 Newtons, which is equivalent to approximately 200 pounds-force (lbf). This requirement ensures the connectors maintain strong connections and provide consistent electrical conductivity, even under stress or tension.

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1) Chemical formula

2) Mg Lewis structure

3) O2 Lewis structure

4) MgO Lewis structure

5) Chemical formula written as Lewis dot structure

.

Answer:

alkaline earth metal

it's because calcium in the periodic table is located in group 2

The best metal to use for coating iron to prevent it from rusting is zinc. It also forms a protective oxide layer on its surface, which provides an additional barrier against rusting.

Zinc is a very reactive metal and can form an oxide layer on the surface of iron when exposed to the air, which acts as a barrier that prevents oxygen and moisture from reaching the iron and causing corrosion. This oxide layer is very thin and very hard, making it an excellent protective coating. Zinc is also relatively inexpensive compared to other metals, making it an attractive choice for protecting iron from rusting. Zinc has a higher electronegativity than iron, which means that it will be more likely to attract oxygen and water molecules away from the iron surface, thus preventing corrosion.

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Nitrogen fixation is primarily carried out by certain groups of microorganisms, including bacteria and archaea referred to as nitrogen-fixing organisms. These organisms possess specialized enzymes called nitrogenases that enable them to convert atmospheric nitrogen gas into ammonium ions.

They may be:

a) Free-living Bacteria: Certain bacteria, such as species belonging to the genera Rhizobium, Azotobacter, and Azospirillum, are capable of nitrogen fixation.

These bacteria can exist independently in the soil or water and convert atmospheric nitrogen into ammonium ions, which can be used by plants and other organisms.

b) Symbiotic Bacteria: Some bacteria establish a mutualistic relationship with certain plants, forming structures called nodules on the roots or stems.

These bacteria, known as rhizobia, enter into a symbiotic association with leguminous plants (e.g., soybeans, clover, peas) or non-leguminous plants (e.g., alders, lupines) capable of hosting them.

Inside the nodules, the bacteria convert atmospheric nitrogen into ammonium ions, which are then utilized by the plants for their growth and development.

In return, the plants provide the bacteria with a suitable environment and nutrients.

c) Cyanobacteria: Cyanobacteria are photosynthetic bacteria commonly found in various aquatic and terrestrial environments. Some species of cyanobacteria, such as Anabaena and Nostoc, possess specialized cells called heterocysts.

These heterocysts provide an anaerobic environment necessary for nitrogen fixation.

Within the heterocysts, nitrogen fixation occurs, converting atmospheric nitrogen into ammonium ions.

The fixed nitrogen can be shared with other cells in the cyanobacterial colony or released into the surrounding environment.

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H2O is the brønsted-lowry acid in the reaction. h2o(l) co32-(aq) → hco3-(aq) oh-(aq)

A chemical that contributes a proton or H+ ion to the other component to create a conjugated base is known as a Bronsted-Lowry acid. A chemical known as a Bronsted-Lowry base is one that receives a proton or H+ ion from another component to create conjugated acid. In terms of proton transport between chemical species, the Brnsted-Lowry hypothesis analyses acid-base interactions. Any species that can donate a proton, H+start text, H, end text, start superscript, plus, and any species that can accept a proton are all considered Brnsted-Lowry acids.

identify the brønsted-lowry acid in the following reaction. h2o(l) co32-(aq) → hco3-(aq) oh-(aq)

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Answer:

To configure the electron sublevels and groups for each element, we can use the following format:

Element symbol: [Electron configuration] Sublevel: Group

V (Z=23): [Ar] 3d3 4s2 Sublevel: 3d, 4s Group: 5, 4

Ni (Z=28): [Ar] 3d8 4s2 Sublevel: 3d, 4s Group: 10, 4

Cu (Z=29): [Ar] 3d10 4s1 Sublevel: 3d, 4s Group: 11, 4

Zn (Z=30): [Ar] 3d10 4s2 Sublevel: 3d, 4s Group: 12, 4

Cr (Z=24): [Ar] 3d5 4s1 Sublevel: 3d, 4s Group: 6, 4

Mn (Z=25): [Ar] 3d5 4s2 Sublevel: 3d, 4s Group: 7, 4

Answer:

Answer is D dont forget to mark btainlist

Answer:

\(\boxed {\boxed {\sf D. \ H_2O_2}}\)

Explanation:

A covalent compound is a molecule made up of covalent bonds, where the atoms share pairs of valence electrons. These compounds consist of two or more nonmetals.

Essentially, if a compound contains a metal, it is an ionic or metallic compound, not a covalent compound.

A. NaCl

This is sodium chloride. It contains sodium (Na) and chlorine (Cl). Sodium is a metal, so this is ionic.

B. CaO

This is calcium oxide. It contains calcium (Ca) and oxygen (O). Calcium is a metal, so this is ionic.

C. MgS

This is magnesium sulfide. It contains magnesium (Mg) and sulfur (S). Magnesium is a metal, so this is ionic.

D. H₂O₂

This is hydrogen peroxide. It contains hydrogen (H) and oxygen (O). Both of these elements are non-metals, so this is a covalent compound.

The correct choice is D. H₂O₂

8. One pair.

because nitrogen has 5 valence electrons, and fluorine has 7, but if there's 3 fluorine atoms, nitrogen shares 1 to each F atom to get it to 8, meaning nitrogen will have a single pair left over since there's no more F atoms to share them with.

By exchanging electrons with one another, atoms create new materials. When two atoms share at least one pair of electrons, this is known as a covalent link. Ionic bonds form when positive  are attracted to one another and share an electron as a consequence.

When two atoms share , they establish a  connection. Because the two positively charged atomic nuclei and shared, negatively charged electrons in a covalent bond are attracted to one another by electrostatic forces, the bond is stable.

One or more pairs of electrons from each atom are shared by the other atoms to form a covalent link. The two atomic nuclei are pulling these electrons in opposite directions. When the gap between two atoms' electronegativities is too narrow for an electron transfer to take place and form ions, a covalent bond is created.

Reactants interact with one another in a chemical reaction, breaking the bonds that hold their atoms together.

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Answer:

Here's your answer on the Image!

Explanation:

I took the K-12 Quiz

Small amounts of corundum are used to create sandpaper to polish steel instead of diamond due to cost-effectiveness. Corundum is a mineral that is readily available and cheaper than diamonds, making it a more affordable option for sandpaper manufacturers.

Although diamonds are a harder material than corundum and can produce a higher level of polish, the cost of diamond abrasives can be prohibitive. Moreover, diamonds are typically used for polishing hard materials such as glass and ceramics, where their hardness is more advantageous.

For polishing steel, corundum is more than sufficient and provides a smooth finish. In addition, corundum is more durable and can withstand the wear and tear of sanding, making it a preferred choice for sandpaper. Hence, small amounts of corundum are used in sandpaper to polish steel due to its cost-effectiveness, durability, and effectiveness.

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