Calculate the number of grams in sodium in 8.4g of Na2C6H6O7 (sodium hydrogen citrate) express your answer using two significant figures


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Answer:

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Answer:

72.6 mL

Explanation:

A quick way to solve this titration problem when you have a monoprotic acid is to use the Dilution equation, M1V1=M2V2.

.589(x)=.821(52.1)

X=72.6 mL

the average rate of change of B from t=0 s to t=402 s. A ---> 2B with

Time: Concentrations of A: 0 0.710, 201 0.430, 402 0.150 is 0.07%

To determine the average rate of change of B from t=0 s to t=402 s, we need to find the change in concentration of B (delta B) and divide it by the change in time (delta t). From t=0 s to t=201 s, the concentration of A changes from 0.710 to 0.430. Since the reaction is A ---> 2B, we can assume that the concentration of B doubles the concentration of A. So, the concentration of B changes from 0.710/2 = 0.355 to 0.430/2 = 0.215.The change in concentration of B is 0.215 - 0.355 = -0.140

From t=201 s to t=402 s, the concentration of A changes from 0.430 to 0.150. Using the same assumption, the concentration of B changes from 0.215 to 0.150/2 = 0.075. The change in concentration of B is 0.075 - 0.215 = -0.140 The total change in concentration of B is the sum of the two changes, which is -0.140 + (-0.140) = -0.280. The total change in time is 402s - 0s = 402sTherefore, the average rate of change of B is -0.280 / 402s = -0.000696, or -0.07% (two significant figures)

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Test forensic investigators can use to test for human or animal blood will be

required to test the statement.

These are different tests and techniques used by appropriate body to

investigate a crime in order to know what really happened and who is

responsible.

The test which can be used to differentiate between human and animal

blood is Precipitin Test.  This is done by identifying the presence of proteins

that are found only in human blood such as albumin.

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Iridium forms metallic bonds, while mercury exhibits a combination of metallic and covalent bonding. These covalent interactions give rise to the low boiling point and weak intermolecular forces in liquid mercury.

Iridium (Ir) and mercury (Hg) exhibit different types of bonding based on their electronic configurations and properties.

Iridium is a transition metal belonging to Group 9 of the periodic table. It has a partially filled d-orbital in its atomic structure, which allows it to form metallic bonds. Metallic bonding occurs when the outer electrons of metal atoms are delocalized and form a "sea" of electrons that are free to move throughout the crystal lattice. This results in the characteristic properties of metals, such as high electrical and thermal conductivity, malleability, and ductility. Iridium forms metallic bonds with other iridium atoms, contributing to its solid, dense, and lustrous nature.

Mercury, on the other hand, is a unique element. It is a transition metal, but it exhibits characteristics of both metallic and covalent bonding. At room temperature, mercury exists as a liquid, which is highly unusual for a metal. This is because mercury atoms have a weak interatomic interaction, known as metallic bonding, similar to other metals. However, due to the presence of unpaired electrons in its 6s orbital, mercury can also form weak covalent bonds. These covalent interactions give rise to the low boiling point and weak intermolecular forces in liquid mercury.

In summary, iridium forms metallic bonds, while mercury exhibits a combination of metallic and covalent bonding.

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Answer:

The strong force binds quarks together in clusters to make more-familiar subatomic particles, such as protons and neutrons. It also holds together the atomic nucleus and underlies interactions between all particles containing quarks. The strong force originates in a property known as colour.

Explanation:

Answer:

B

Explanation:

actin and reaction force are equal Newton 3 law

The proximity of unsaturated groups (C=C, C=O, aromatic) and electronegative atoms (O, N, halogen) has an impact on the proton NMR chemical shift. Electronegative groups shift to the left (down field; ppm rise).

The chemical shift in nuclear magnetic resonance (NMR) spectroscopy refers to the atomic nucleus' resonant frequency in relation to a standard in a magnetic field. The location and quantity of chemical changes frequently serve as diagnostic indicators of molecular structure.

You take into account the chemically non-equivalent proton(s) one at a time while making chemical shift predictions. Find the origin of each proton or proton pair that is not chemically comparable. Whether the proton(s) is/are linked to a methyl, methene, or methine determines the beginning point.

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The balanced equation of the reaction could be written as; \(HN_{5} O_{3} + Mg ------ > MgO + HNO_{3}\)

We know that in chemistry, the term reaction has to do with the combination of two or more species to give a product. Now the process of the reaction would alter the chemical composition of the reactants as we move on the way to get the ne substances called the products. There would be a breaking down of the bonds that holds the reactant molecules together and then there is a recombination of the atoms in a different way so as to obtain the products of the reaction. This is how a chemical reaction takes place in a given system.

In this case we have the oxidation of the compound called \(HN_{5} O_{3}\). In this case, the compound is actually being oxidized as we can see from the process that would be shown in the reaction equation accurately.

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Answer:

Nobelium or Beryllium

Answer:

1.82 x 10^-12 m.

Explanation:

The de Broglie wavelength of an electron traveling at 1.02 x 10^5 m/s is 1.82 x 10^-12 m.

The de Broglie wavelength of a particle is a measure of the particle's wave-like behavior, and it is given by the following equation:

λ = h / mv

where λ is the de Broglie wavelength, h is the Planck constant, m is the mass of the particle, and v is the velocity of the particle.

In the case of an electron traveling at 1.02 x 10^5 m/s, the de Broglie wavelength is given by the following calculation:

λ = 6.62 x 10^-34 J * s / (9.11 x 10^-31 kg * 1.02 x 10^5 m/s)

This simplifies to:

λ = 1.82 x 10^-12 m

Therefore, the de Broglie wavelength of an electron traveling at 1.02 x 10^5 m/s is 1.82 x 10^-12 m.

Answer:

Sulfur

Explanation:

A non-metal in the third period that should have chemical properties similar to oxygen is sulfur.

This is because elements in the same group/family have similar chemical properties.

Answer:

an if/then statement

Explanation:

Answer:

approximately 251.55 grams of AuCl3 would contain 5.0 x 10^23 molecules.

Answer:

Introduction: (5 points)

Before diving into each topic, it's important to understand why alternative energies are important. Fossil fuels are limited resources that produce harmful emissions and contribute to climate change. Therefore, we must turn to alternative energies to reduce our reliance on these resources and mitigate their negative impacts on the environment. In this presentation, we will discuss five alternative energies: Biomass, Geothermal, Hydroelectric, Hydrogen, Solar Power, and Wind Energy.

Biomass: (10 points)

1.

Biomass refers to organic matter, such as wood, crops, and waste, that can be converted into energy. Biomass can be used as a substitute for gasoline to run cars, trucks or buses.

2.

Biomass can be used to heat homes through wood stoves, pellet stoves, and biomass boilers.

3.

Advantages of biomass include its renewability, availability, and its ability to reduce waste. However, it can also lead to deforestation, land-use change, and pollution.

4.

Biomass energy production involves converting potential energy (stored in biomass) into kinetic energy (in the form of steam), which is then used to generate electricity.

Geothermal:

5.

Geothermal energy comes from the heat within the Earth's crust.

6.

Geothermal energy can be used to create electricity through steam turbines.

7.

Geothermal energy can be used directly to heat homes and factories through geothermal heat pumps.

8.

A heat pump is a device that transfers heat from a colder area to a hotter area.

9.

Advantages of geothermal energy include its reliability, low emissions, and its ability to provide heating and cooling. However, it can also lead to land subsidence, water pollution, and seismic activity.

Hydroelectric:

10.

Hydroelectric power is electricity generated from the movement of water.

11.

Moving water turns a turbine, which spins a generator to produce electricity. The dam is used to regulate the flow of water and to control the amount of electricity generated.

12.

Advantages of hydroelectric power include its renewability, efficiency, and ability to provide flood control. However, it can also lead to the displacement of communities, harm aquatic life, and reduce downstream water availability.

13.

The Hoover Dam in Nevada is an example of a hydroelectric power plant.

Hydrogen:

14.

Using hydrogen as a fuel source involves combining it with oxygen to produce energy in the form of electricity and water vapor.

15.

Hydrogen is found in water, fossil fuels, and organic matter.

16.

Advantages of using hydrogen as a fuel source include its renewability, abundance, and its ability to reduce emissions. However, it can also be expensive to produce, transport, and store.

17.

A fuel cell is an electrochemical device that converts hydrogen and oxygen into electricity. It works by passing hydrogen through an anode, where it is oxidized, producing electrons and protons. The electrons flow through a circuit to produce electricity, while the protons pass through a membrane to the cathode, where they combine with oxygen to form water.

Solar Power:

18.

Solar energy is energy from the sun that can be converted into electricity.

19.

A solar cell is made of a semiconductor material, such as silicon, that absorbs photons from the sun and generates electrons. These electrons flow through a circuit to produce electricity.

20.

Advantages of solar energy include its renewability, low emissions, and its ability to reduce dependence on fossil fuels. However, it can also be expensive to install, dependent on weather conditions, and can lead to land-use change.

21.

The Topaz Solar Farm in California is an example of solar energy being used in the U.S.

Wind Energy

22.

Wind energy is a type of renewable energy that comes from the wind. Wind energy is generated by the movement of air across the earth's surface caused by differences in temperature and pressure. Wind turbines are used to convert wind energy into electrical energy.

23.

Wind energy is converted into electrical energy by wind turbines. The turbines are equipped with blades that capture the wind and spin a rotor. The rotor turns a shaft, which drives a generator that produces electricity.

24.

Advantages of wind energy include:

Disadvantages of wind energy include:

25.

Alta Wind Energy Center in California is an example of a wind energy project in the US. It is one of the largest wind farms in the world, with a total capacity of 1,548 MW.

Answer:

The percent yield is 24.2%.

Explanation:

1st) It is necessary to balance the chemical reaction:

2nd) From the balanced reaction, we know that 2 moles of C2H6 react with 7 moles of O2 to produce 4 moles of CO2. With the molar mass of C2H6 (30g/mol), O2 (32g/mol) and CO2 (44g/mol), we can convert the moles to grams:

- C2H6 conversion:

- O2 conversion:

-CO2 conversion:

Now we know that 60g of C2H6 react with 224g of O2 to produce 176g of CO2.

3rd) From the given values of C2H6 (6.0g) and O2 (20.0g), it is necessary to find out which one is the limiting reactant and which one is the excess reactant:

We can see that the 6.0g of C2H6 will need 22.4g of O2 to react, but we only have 20.0g of O2, so O2 is the limiting reactant and C2H6 will be the excess reactant.

4th) Now, using the limiting reactant, we have to calculate the grams of CO2 that should be produced from the stoichiometry of the reaction (this is the Theoretical yield):

5th) Finally, we can calculate the Percent yield of the reaction, by using the Theoretical yield (15.7g) and the Actual yield (3.80g):

So, the percent yield is 24.2%.

Answer:

(a) GaF3, gallium(III) fluoride

(b) LiH, lithium hydride

(c) AlI3, aluminum(III) iodide

(d) K2S, potassium sulfide

Answer: Smelling salts and oxygen are introduced into a metal catalyst-containing tube (platinum). Typically warmed to get the reaction started. The alkali is then oxidized to produce nitric oxide.

Answer:

The Ostwald process is a chemical process used for making nitric acid. Wilhelm Ostwald developed the process, and he patented it in 1902. The Ostwald process is a mainstay of the modern chemical industry, and it provides the main raw material for the most common type of fertilizer production

Explanation:

The first stage of the Ostwald process involves the catalytic oxidation of ammonia into nitric oxide, using platinum as the catalyst. The nitric oxide is then transferred to a different oxidizing tower, where it is oxidized into nitrogen dioxide

The given reaction is an example of nuclear fusion.

This is because two lighter hydrogen atoms fuse to give a heavier helium atom. There is also an increase in the atomic number of the product.

Nuclear fission reactions are reactions in which the nucleus of large atoms are split into nucleus of two or more smaller atoms.

For example, uranium atoms split into krypton and barium.

Nuclear fusion reactions involve the nucleus of two or more smaller atoms combining to give an atom of a larger nucleus.

For example, hydrogen atoms fuse to give a helium atom.

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To calculate the pH of a solution of NaOH (sodium hydroxide), we need to consider that NaOH is a strong base that dissociates completely in water, producing hydroxide ions (OH⁻).

Given:

Concentration of NaOH = 0.005 M

Since NaOH dissociates into one hydroxide ion (OH⁻) per molecule, we can determine the concentration of hydroxide ions in the solution, which will allow us to calculate the pOH. Then, we can convert the pOH to pH using the relationship: pH + pOH = 14.

1. Calculate the concentration of hydroxide ions (OH⁻):

The concentration of OH⁻ ions will be the same as the concentration of NaOH since NaOH dissociates completely.

Concentration of OH⁻ = 0.005 M

2. Calculate the pOH:

pOH = -log[OH⁻]

pOH = -log(0.005)

Using logarithm properties, we can determine the pOH value:

pOH = -log(0.005)

pOH = -(-2.301)

pOH = 2.301

3. Calculate the pH:

pH = 14 - pOH

pH = 14 - 2.301

pH ≈ 11.699

Therefore, the pH of a 0.005 M NaOH solution is approximately 11.699.

The pH of a 0.005 M concentration of NaOH ( sodium hydroxide ) solution is approximately 11.70.

The pH of a solution is defined as the logarithm of the reciprocal of the hydrogen ion concentration  [H+] of the given solution.

From the formula;

pH = -log[ H⁺ ]

pOH = -log[ OH⁻ ]

pH + pOH = 14

Given that; the concentration of solution (molarity) ( OH⁻ ) is 0.005 M.

First, we determine the pOH.

pOH = -log[ OH⁻ ]

Plug in ( OH⁻ ) = 0.005

pOH = -log[ 0.005 ]

pOH = 2.30

Now, plug pOH = 2.30 into the above formula and solve for the pH:

pH + pOH = 14

pH + 2.30 = 14

Subtract 2.30 from both sides:

pH + 2.30 - 2.30 = 14 - 2.30

pH = 14 - 2.30

pH = 11.7

Therefore, the pH of the solution is 11.7.

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a. The Mass of water driven off = 0.15 g

b. Moles of anhydrate = 0.00257 moles

c. Moles of water driven off is 0.00833 moles

d. There are 3 moles of water within the crystalline structure of one molecule of the hydrated salt.

e. The molecular formula of the hydrated salt will be X.3H₂O

a. The mass of water driven off from the hydrated salt is:

Mass of water driven off = 0.5 g - 0.35 g

Mass of water driven off = 0.15 g

b. Molecular mass of salt = 136 g/mol

moles of anhydrate = 0.35/136

Moles of anhydrate = 0.00257 moles

c. Moles of water driven off = mass/molar mass

molar mass of water = 18 g/mol

Moles of water driven off = 0.15/18

Moles of water driven off = 0.00833 moles

d. Moles of water within the crystalline structure of one molecule of the hydrated salt is determined by converting to whole number mole ratio by dividing with the smallest ratio,

Salt to water ratio = 0.00257 /0.00257  :  0.00833/0.00257

Salt to water ratio = 1 : 3

Therefore, there are 3 moles of water within the crystalline structure of one molecule of the hydrated salt.

e. Assuming the anhydrous salt is X, the molecular formula of the hydrated salt will be X.3H₂O

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Answer:

Heat = 7375J

Final temperature of the mixture = 27.35°C

Explanation:

In the reaction:

2HCl(aq) + Ba(OH)₂(aq) → BaCl₂(aq) + 2H₂O(l) ΔH = –118 kJ

When 2 moles of HCl reacts with excess of Ba(OH)₂ there are released 118kJ.

In the reaction, moles of HCl and Ba(OH)₂ that reacts are:

Moles HCl = 0.250L ₓ (0.500 moles / L) = 0.125 moles HCl

Moles Ba(OH)₂ = 0.500L ₓ (0.500 moles / L) = 0.250 moles Ba(OH)₂

For a complete reaction of 0.125 moles of HCl you need:

0.125 mol HCl ₓ (1 mole Ba(OH)₂ / 2 moles HCl) = 0.0625 moles Ba(OH)₂

As you have 0.250 moles of Ba(OH)₂, this reactant is in excess

2 moles of HCl that react release 118kJ, 0.125 moles of HCl release:

0.125 moles HCl ₓ (118kJ / 2 moles) = 7.375kJ =

The heat released can be obtained with the formula:

Q = C×m×ΔT

Where Q is heat, C specific heat of the solution, m its mass and ΔT change in temperature.

Replacing:

Q = C×m×ΔT

7375J = 4.18J/g°C×750.0g×ΔT

2.35°C = ΔT

As ΔT = Final T - Initial T:

2.35°C = Final T - 25.0°C

Explanation:

All atoms of one type were identical in mass and properties.

The electric current is  0.025 A

Electric current refers back to the go with the flow of energy in an electronic circuit and to the amount of strength flowing through a circuit. it's far measured in amperes (A). the bigger the cost in amperes, the more energy is flowing within the circuit.

Ag+ + e¯ →Ag

1F deposits 107.87 g/mol (molecular mass) of silver

1F = 96500 C

Let, 107.87 g/mol needed = 96500 C

Number of coulombs required to deposit 0.3650 g of silver =(96500/107.87) 0.3650  

Q = 326.5 C

According to Faraday’s law, Q = I x t

I = 326.5 C / (216 x 60 s) = 0.025 A

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By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers.

By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers. Energy storage's inherent ability to offer backup power in the event of grid failure is a feature that both residential consumers and commercial owners find highly desirable.

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Observation statements: When the mass of the sun is larger, Earth moves around the sun at a slower pace.

When the mass of the sun is smaller, Earth moves around the sun at a faster pace.

When Earth is closer to the sun, its orbit becomes faster.

When Earth is farther from the sun, its orbit becomes slower.

Hypothesis:

The gravitational force between two objects depends on their masses and the distance between them, as described by the law of universal gravitation. Therefore, if we change the mass of the sun or the distance between Earth and the sun, we should observe changes in the speed and shape of Earth's orbit around the sun.

Results:

Our observations confirm our hypothesis. When we increased the mass of the sun, we noticed that Earth's orbit around the sun became slower.

Conversely, when we decreased the mass of the sun, Earth's orbit became faster. This is consistent with the idea that larger masses exert a stronger gravitational force, which in turn affects the speed and shape of Earth's orbit.

Similarly, when we moved Earth closer to the sun, we observed that its orbit became faster, while moving it farther away from the sun resulted in a slower orbit. This is because the gravitational force between Earth and the sun is stronger when they are closer together, and weaker when they are farther apart. Therefore, the speed and shape of Earth's orbit are influenced by both the mass of the sun and the distance between Earth and the sun.

Overall, our observations suggest that the laws of universal gravitation played a crucial role in the formation and evolution of the Solar System, as they determine the dynamics of planetary motion and the stability of planetary orbits.

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Taking into account the definition of dilution, if chemist must dilute 93.1 mL of 7.79 of uM aqueous mercury (I) chloride solution until the concentration falls to 3.00 uM, the final volume is 0.24175 L.

Dilution is a procedure by which the concentration of a solution is lowered, usually with the addition of a diluent.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

7.79 uM× 93.1 mL= 3 uM× Vf

Solving:

(7.79 uM× 93.1 mL)÷ 3 uM= Vf

241.75 mL= 0.24175 L = Vf (being 1000 mL= 1 L)

In summary, the final volume is 0.24175 L.

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Answer:

The way the chemist works is through the chemistry of astronomical events in the atmosphere of delocalisation which causes a significant impact on Kanye West which ellaborates the terrific police of the UK. And thats why me and Jennifer Lopez share the same hair band.