when 35.00 grams of niobium is mixed with 75.00 grams of iodine the percent yield for the product is 63.29%. what mass of product (in grams) formed?

The water molecules must have gained more thermal energy while Anh was away from the house.

An increase in the temperature of a body means that the body has gained more energy in the form of heat, also known as thermal energy.

The thermal energy represents the characteristic of a body responsible for its temperature.

An increase in the temperature of the water molecules increases their kinetic energy and, thus, makes the water molecules move around faster than before.

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Answer:

Converting between matter

Explanation:

Chemical reactions can be the decomposition or synthesis of matter.

The heat energy absorbed by the water in the experiment according to the calorimeter data is 10450 J

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

From calorimetry, we understood that heat absorbed is given by the following formula

Q = MCΔT

Inputting the given parameters, we can obtain the heat absorbed by the water as follow:

Q = 100 × 4.18 × 25

Q = 10450 J

Thus, we can conclude that the heat energy absorbed by the water is 10450 J

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Answer:

A physical change

Explanation:

A physical change is a form of transformation in which an element or matter changes from one material state to another. For example from solid-state to liquid state through melting. Another is crushing and freezing.

Hence in this case, when a liquid is cooled during an investigation causing it to solidify. The process is called Freezing which occurred as a result of a PHYSICAL CHANGE.

Answer:

The salt bridge (or porous disk) connects the two half cells together. As electrons flow from one cell to another, ions flow through the salt bridge to maintain a charge equilibrium. Had there not been a salt bridge, the reduction and oxidation reactions would eventually stop due to the difference in charge.

What would happen if no salt bridge were used in an electrochemical?

If no salt bridge were present, the solution in one-half cell would accumulate a negative charge and the solution in the other half cell would accumulate a positive charge as the reaction proceeded, quickly preventing further reaction, and hence the production of electricity.

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Molecule which is not a constitutional isomer of Cyclobutane is : A. Molecule A.

In chemistry, isomers are molecules with identical molecular formulae, that is the same number of atoms of each element but distinct arrangements of atoms in the space. Isomerism is the existence or possibility of isomers and isomers do not necessarily share similar chemical or the physical properties.

Isomers are compounds that have exactly the same empirical formula, but differ from each other by the way in which atoms are arranged. Examples of isomers with the formula of C8H10 are ethyl benzene, m-xylene, p-xylene and o-xylene.

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Yes, Iron reacts with O2 to give an iron oxide.

When iron comes in contact with oxygen in presence of water it gives ferric oxide, Also known as rust is formed.

The balanced chemical reaction of above is given as follows,

4Fe + 3O2 + x. H2O → 2Fe2O3.xH2O.

A redox commerce between oxygen and iron in a water-rich terrain, similar as largely sticky air, results in the conformation of rust. The rusting of iron is characterised by the conformation of a subcaste of a red, short substance that readily breaks into greasepaint. The rusting process can be stopped or braked down with a fleece of oil painting. A high- quality makeup will also help to decelerate down rusting by keeping humidity from getting to the essence.

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Answer:

high rates of evaporation

Approximately 6.02 x 1025 mole of sand particles would be present in the truck.

A substance's mole is equivalent to 6.022 x 1023 of that substance. (such as atoms, molecules, or ions). The number 6.022 1023 is referred to as "Avogadro's number" or "Avogadro's constant." To translate between particle mass and number, use the mole idea.

Yes, if we know how many moles of sand are in the truck, we can calculate how many sand particles are there.

Avogadro's number, which is the quantity of particles (atoms, molecules, or ions) in one mole of a substance, can be used to calculate the number of particles in a substance. The equivalent of 6.02 x 1023 particles/mol is Avogadro's number.

Number of particles = Avogadro's number x the number of moles

The quantity of sand particles can be determined as follows if the truck contains 100 moles of sand:

100 moles times 6.02 x 1023 particles/mol equals the number of particles.

6.02 x 1025 particles make up the total.

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Answer:

A

Explanation:

Atoms of elements can lose or gain electrons making them no longer neutral, they become charged. A charged atom is called an ion. When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons.

There are two types of intermolecular forces that occur between paper and water: hydrogen bonding and van der Waals forces.

Hydrogen bonding occurs because paper is made of cellulose, which contains many hydroxyl (-OH) groups that can form hydrogen bonds with water molecules.

Van der Waals forces, specifically dipole-dipole interactions, also occur between paper and water. These forces arise from the temporary dipoles that are created when the electrons in the molecules are not evenly distributed.

Overall, these intermolecular forces contribute to the strong attraction between paper and water, which is why paper becomes wet and absorbs water when it comes into contact with it.

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\(SeH_4^{2+}\) is ionic, SeH4 is  inorganic compound. tetrahydridoselenonium is a  dication \(SeH_4^{2+}\).

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In 185 ml of ethanol, there are 1.7043 * \(10^{24}\) molecules of ethanol (c2h5oh), the alcohol found in alcoholic beverages.

Alcohols are organic compounds made of the elements hydrogen (H), oxygen (O), and carbon (C). Alcohol with 2 carbons is referred to as octane (also known as ethyl alcohol). Beer, wine, and vodka all include the kind of alcohol known as ethanol.

mass = density * volume

mass = 0.789 * 185

mass = 145.965 g

Then, using the formula C2H5OH, get the molecular weights of ethanol:

mass of H = 1

mass of C = 12

mass of O = 16

Mr = 2*12 + 1*16 + 6*1

Mr = 46 g/mole

Now you can determine how many moles are present in that mass:

# of moles = mass / Mr

# of moles = 130.185/ 46

# of moles = 2.83 moles

From there, you would analyze how many molecules there are:

# of molecules = moles * NA

# of molecules = 2.83 * 6.0221415 * 10^23

# of molecules = 1.7043 * 10^24

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The molecular formula of thioformaldehyde can be determined using the given information about its molar mass and percentage composition of elements.The most likely Lewis structures for thioformaldehyde are Structure 2 and Structure 3.

Step 1: Convert the percentage composition to grams.
- The compound is 26.06% carbon (C), 69.57% sulfur (S), and 4.37% hydrogen (H) by mass.
- Assume we have 100g of the compound, then we would have 26.06g of carbon, 69.57g of sulfur, and 4.37g of hydrogen.
Step 2: Convert the grams of each element to moles.
- Use the molar mass of each element to convert grams to moles.
- The molar mass of carbon (C) is 12.01 g/mol, sulfur (S) is 32.07 g/mol, and hydrogen (H) is 1.01 g/mol.
- Calculate the moles of each element by dividing the grams by the molar mass.
- Carbon: 26.06g / 12.01 g/mol = 2.17 mol
- Sulfur: 69.57g / 32.07 g/mol = 2.17 mol
- Hydrogen: 4.37g / 1.01 g/mol = 4.33 mol
Step 3: Determine the empirical formula.
- The empirical formula represents the simplest ratio of atoms in a compound.
- Divide the moles of each element by the smallest number of moles to get the simplest ratio.
- In this case, the smallest number of moles is 2.17, which is the number of moles for carbon and sulfur.
- Carbon: 2.17 mol / 2.17 mol = 1
- Sulfur: 2.17 mol / 2.17 mol = 1
- Hydrogen: 4.33 mol / 2.17 mol = 2
- The empirical formula is CH2S.
Step 4: Determine the molecular formula.
- The molecular formula represents the actual number of atoms in a compound.
- To determine the molecular formula, we need to know the molar mass of the empirical formula.
- The molar mass of CH2S is 12.01 g/mol + 2(1.01 g/mol) + 32.07 g/mol = 46.1 g/mol.
- Since the molar mass of thioformaldehyde is given as 46.086 g/mol, the molecular formula is the same as the empirical formula, CH2S.
Now let's move on to drawing the possible Lewis structures of thioformaldehyde and determine which structure is more likely to resemble the real molecule using formal charge.
Lewis structure is a diagram that shows the bonding and non-bonding electrons in a molecule.

Possible Lewis structures for thioformaldehyde (CH2S) include:
Structure 1:
     H    H
      \  /
       C=S
       |
       H
Structure 2:
     H    H
      \  /
       S=C
       |
       H
Structure 3:
     H    H
      \  /
       S=C
       |
       H
In each structure, the carbon atom is bonded to two hydrogen atoms and one sulfur atom. The sulfur atom is bonded to the carbon atom through a double bond.

To determine which structure is more likely to resemble the real molecule, we need to consider the formal charges.
The formal charge on an atom is the difference between the number of valence electrons in an isolated atom and the number of electrons assigned to that atom in a Lewis structure.
In general, a structure with the lowest formal charges on the atoms is more likely to resemble the real molecule.
In Structure 1, the carbon atom has a formal charge of +1, the sulfur atom has a formal charge of -1, and the hydrogen atoms have a formal charge of 0.
In Structure 2, the sulfur atom has a formal charge of 0, the carbon atom has a formal charge of 0, and the hydrogen atoms have a formal charge of 0.
In Structure 3, the sulfur atom has a formal charge of 0, the carbon atom has a formal charge of 0, and the hydrogen atoms have a formal charge of 0.
Based on the formal charges, Structure 2 and Structure 3 are more likely to resemble the real molecule since all the atoms have formal charges of 0.

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The number of moles that contains 5.3 × 10¹² particles of water is 8.8 × 10-¹² moles.

The number of moles in a substance can be calculated by dividing the number of atoms/molecules in the substance by Avogadro's number as follows:

no of moles = no of atoms ÷ 6.02 × 10²³

According to this question, a container contains 5.3 × 10¹² particles of water. The number of moles can be calculated as follows:

no of moles = 5.3 × 10¹² ÷ 6.02 × 10²³

no of moles = 8.8 × 10-¹² moles

Therefore, 8.8 × 10-¹² moles is present in the water molecule.

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Answer:

0.0625

Explanation:

Answer:

62,500

Explanation:

The true statements from the list are 1. Hydrogen gas is a better reducing agent than tin metal, 2. Tin metal will reduce Cu2+ to copper metal and 3. Copper metal will not reduce H+ to hydrogen gas.

1. Hydrogen gas is a better-reducing agent than tin metal: This is true because hydrogen gas has a lower reduction potential than tin metal. A reducing agent tends to lose electrons and get oxidized, and the lower the reduction potential, the more easily it can lose electrons and act as a reducing agent.

2. Tin metal will reduce Cu2+ to copper metal: This is a true statement. Tin metal has a higher reduction potential than Cu2+, so it can donate electrons to Cu2+ and reduce it to copper metal while getting oxidized to Sn2+.

3. Copper metal will not reduce H+ to hydrogen gas: This is true because copper metal has a lower reduction potential than H+. Copper metal cannot donate electrons to H+ and reduce it to hydrogen gas since it is not strong enough reducing agent compared to hydrogen.

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Answer:

Sugar, sodium chloride, and hydrophilic proteins are all substances that dissolve in water. Oils, fats, and certain organic solvents do not dissolve in water because they are hydrophobic.

And, water is called the "universal solvent" because it dissolves more substances than any other liquid. ... Water molecules have a polar arrangement of the oxygen and hydrogen atoms—one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge.

I don't see any options so there i hope it helps .

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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There are two N≡N bonds and three H–H  bonds are in reactants.

Given:

The reaction between nitrogen gas and hydrogen gas.

\(2N_2+3H_2\rightarrow 2NH_3\)

To find:

Bonds on the reactant side

Solution:

\(2N_2+3H_2\rightarrow 2NH_3\)

Reactants in the reaction = \(N_2, H_2\)

The bond between nitrogen atoms in single \(N_2\) molecule  = N≡N (triple bond)

Then in two \(N_2\)  molecules = 2 N≡N (triple bonds)

The bond between hydrogen atoms in single \(H_2\) molecule = H-H (single bond)

Then in three \(H_2\)  molecules = 3  H-H (single bonds)

Product in the reaction =\(NH_3\)

The bonds between nitrogen and hydrogen atoms in single \(NH_3\) molecule = 3 N-H (single bond)

Then in two \(NH_3\)  molecules = 6  N-H (single bonds)

So, there are two N≡N bonds and three H–H bonds are in reactants.

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Answer:

4.29 /mL

Explanation:

density= mass/volume

The density of the unknown object is 4.929 centimeter cube ( cm³ ).

Density is the mass of an object in the per unit volume of liquid and can be calculated by dividing the mass of an object to the volume of the object and the unit of density is centimeter cube.

Here, mass of object is 35.49 g and the water displacement to find the volume is 52.3 mL-  45.1 mL = 7.2 ml.

                    Density = mass of object / volume of object

Substituting the value in formula,

                    density = 35.49 / 7.2

                     Density =  4.929 centimeter cube ( cm³ )

Therefore,  4.929 centimeter cube ( cm³ ) is the density of a given object.

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The time it takes to heat this water in a 1-kg steel pan sitting on a 1,500-W electric stove burner that transfers 75% of its energy output to the water and the pan is 90 seconds (rounded to the nearest whole second).

We need to calculate the time taken to heat the water in a 1-kg steel pan sitting on a 1,500-W electric stove burner that transfers 75% of its energy output to the water and the pan. The given information are as follows:

Specific heat of water, cw = 4184 J/kg °C

Specific heat of steel, cs = 450 J/kg °C

Energy supplied by the electric stove burner, P = 1,500 W (75% of which is transferred to the water and the pan)

Mass of water, mw = 250 g = 0.25 kg

Mass of steel pan, ms = 1 kg

Initial temperature of water and steel pan, T1 = 10 °C

Final temperature of water and steel pan (boiling point of water), T2 = 100 °C

Heat absorbed by the steel pan = Qs = ms × cs × (T2 - T1)Heat absorbed by the water = Qw = mw × cw × (T2 - T1)

Total heat absorbed by the water and the pan = Q = Qw + Qs = (0.25 × 4184 × 90) + (1 × 450 × 90) J= 94,140 + 40,500 J= 1,34,640 J

Time taken to heat the water and the pan = t = Q/P= 1,34,640 / 1,500 s= 89.76 or 90 s

Therefore, the time it takes to heat this water in a 1-kg steel pan sitting on a 1,500-W electric stove burner that transfers 75% of its energy output to the water and the pan is 90 seconds (rounded to the nearest whole second).

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Answer: In the chlor alkali process, sodium hydroxide is prepared from common salt (sodium chloride). The byproducts are hydrogen gas and chlorine gas. Electrolysis of aqueous sodium chloride (brine solution) in Castner-kellner cell gives sodium hydroxide, chlorine gas and hydrogen gas.

Answer: Useful substances are obtained from common salt by the process of electrolysis

The total amount of energy involved in the conversion of 500 g of liquid water at 25.0 °C to ice at -35.0 °C can be calculated by considering the energy required to cool the water from 25.0 °C to 0 °C and the energy released when the water freezes to ice at 0 °C.

To calculate the total energy involved, we need to consider the two steps involved in the conversion. The first step is cooling the liquid water from 25.0 °C to 0 °C. This process requires the removal of heat energy, and the amount of energy can be calculated using the formula Q = mcΔT, where Q is the heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. The specific heat capacity of water is approximately 4.18 J/g·°C.

The second step is the phase change from liquid water at 0 °C to ice at 0 °C. During this phase change, heat energy is released as the water molecules arrange into a solid crystal lattice. The amount of energy released during this process can be calculated using the formula Q = mL, where Q is the heat energy, m is the mass, and L is the latent heat of fusion, which is 334 J/g for water.

By calculating the energy involved in each step and adding them together, we can determine the total amount of energy involved in the conversion of 500 g of liquid water at 25.0 °C to ice at -35.0 °C.

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Answer:

Similarity: Rocks within the mantle contain more magnesium and iron than the ones in the crust.

Difference: Rocks in the deep mantle are under intense heat and pressure. In this case, they are semi-solid rocks that flow slowly. On the other hand, the part of the mantle that is nearest to the surface consists of rigid rocks. It has a lower temperature than the rocks in the deep mantle.

Explanation:

Rocks within the mantle contain more magnesium and iron than the ones in the crust.

Rocks in the deep mantle are under intense heat and pressure. In this case, they are semi-solid rocks that flow slowly.

On the other hand, the part of the mantle that is nearest to the surface consists of rigid rocks. It has a lower temperature than the rocks in the deep mantle.

According to geologists, a rock is a naturally occurring material made up of crystalline crystals of various minerals that have fused together to form a solid mass.

Therefore, Rocks within the mantle contain more magnesium and iron than the ones in the crust.

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Answer:

presence or absence of a nucleus

Explanation:

These classification of organisms into broad domains is based on the present or absence of nucleus in the cell of an organism.

The archaea are prokaryotes and they lack a distinct cellular nuclei.

Bacteria are similar to archaea but bacteria have only one RNA polymerase

Eukarya have true nucleus and membrane bound organelles .

So, the variations in their cells are used to classify organisms into the broad categories

Answer:

The answer is A.

Explanation:

Answer:

Using solar energy, hydroelectric energy and wind are major ways of conserving natural resources. Trees and other organic energy sources are traditional sources of renewable energy. Forests can be replanted and hemp and other organic materials such as ethanol can be used to preserve natural resources.