3. How many grams are in 7.83 X 10 23 atoms of iron?

Answer:

A There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products.

Explanation:

Matter is conserved in a chemical equation if there are no loss of atoms. That means, total number of atoms of elements must be the same as the total number of element on the product side. The correct option is;

A. There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products.

Answer:

its A. i just did dat

The following are :

(a) compound

(b) compound

(c) mixture

(d) mixture

In first one is red atom is bonded with one white atom and all the given are the same so this is an compound. in the second one the one red atom bonded with two white atom and all are the same this means this is also compound. the third one is one is bonded with same atom but it also have another atom bonded with same atom so this is a mixture. this kis exact same case in the  fourth one there mixture.

Thus, The following are :

(a) compound

(b) compound

(c) mixture

(d) mixture

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Answer:

The most accurate and percise player was Josh

Answer:

Explanation:

When a flask is dipped in very hot water in a large beaker , the flask expands due to heat gain . As a result , level of water in tube fitted in flask goes down .

After some time , the water inside tube also become hot so it expands  . coefficient of volume expansion of water is more than coefficient of volume expansion of glass . Hence greater expansion takes place in the volume of water . It is due to this fact that water level in tube starts rising after some time of fall .

\(2Mg + 2HCl = MgCl_2 + H_2\)

The remaining mass has escaped the test tube, as hydrogen is in gaseous form.

Answer:Mass number - Atomic Number = Neutrons

Explanation:

The correct answer is that a) covalent bonds need to form between molecules. The process of polymerization to polybutene doesn't require any of the other given transformations.

The polymerization process of 1-butene to polybutene includes the homolytic cleavage of the double bond and the formation of new covalent bonds between the radical formed and another molecule of 1-butene. This means that there is no need for oxidation (option b), formation of additional double bonds (option c, although the resulting molecule could also undergo polymerization, but it would not result in the formation of polybutene), or exchange of hydrogen atoms between the molecules (option d).

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Answer: A. Covalent bonds would need to form between the molecules.

Explanation: Got 100 on edmentum

The coffee's pH will be 10.

What does pH refer to?

because hydrogen ions attach to water molecules for form hydronium ions.

To calculate the pH of a solution, use the equation

pH = − log [H3O+]

Since we are given the hydronium ion (H3O+) concentration of the solution, we can plug this value into the formula.

pH = −log[ 1.00 × 10^−10M]

pH = 10

Hence, The pH of this solution is 10

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If you accidentally get NaOH solution on your skin, take the following laboratory actions:

Certain hazards can occur in laboratories and require immediate action and rapid containment.

According to this question, the NaOH solution is inadvertently splashed onto the skin. NaOH is irritant so you should wash it with water

If you accidentally get NaOH solution on your skin, take the following actions:

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Answer:

True,When fluorine gas is put into contact with calcium metal at high temperatures, calcium fluoride powder is created in an exothermic reaction.

Answer:

im pretty sure its b

Explanation:

When any substance converts to liquid then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. The line along B represents the melting of unknown substance. Therefore the 72°C is melting point of the substance.

Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.

During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing.

The line along B represents the melting of unknown substance. Therefore the 72°C is melting point of the substance.

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Answer:

19.45g of Cu are expect to be produced

Explanation:

Based on the reaction:

2Ni + 3CuCl2 → 3Cu + 2NiCl3

2 moles of Ni react with 3 moles of CuCl2 to produce 3 moles of Cu

To solve this question we must find the moles of each reactant in order to find the limiting reactant. With the limiting reactant we can find the moles of Cu produced and the mass as follows:

Moles Ni -Molar mass: 58.6934g/mol-

12.00g * (1mol / 58.6934g) = 0.204 moles Ni

Moles CuCl2 -Molar mass: 134.45g/mol-

42.00g * (1mol / 134.45g) = 0.312 moles CuCl2

For a complete reaction of 0.204 moles of Ni are required:

0.204 moles Ni * (3 moles CuCl2 / 2 moles Ni) = 0.306 moles of CuCl2

As there are 0.312 moles, CuCl2 is the excess reactant and Ni is limiting reactant.

Moles Cu:

0.204 moles Ni * (3moles Cu / 2 moles Ni) = 0.306 moles of Cu are produced

Mass Cu:

0.306 moles of Cu * (63.546g / mol) =

Answer:

1.37dm³

Explanation:

To solve this problem, let us write the reaction expression:

               2KClO₃  →   2KCl  + 3O₂

Now, mass of KClO₃ is 5g, let us find the number of moles;

  Number of moles  = \(\frac{mass}{molar mass}\)  

  Molar mass of KClO₃  = 39 + 35.5 + 3(16) = 122.5g/mol

 Now;

 Number of moles  = \(\frac{5}{122.5}\)   = 0.04mole

  So;

       2 moles of KClO₃  will produce 3 moles of oxygen gas

       0.04 mole of KClO₃  will produce \(\frac{3 x 0.04} {2}\)   = 0.06moles

At STP;

        1 mole of gas has  a volume of 22.4dm³

       0.06 mole of oxygen gas will have a volume of 22.4 x 0.06 = 1.37dm³

Answer:

154

Explanation:

Answer: The video compared to things i've seen on TV seems much more stressful. On TV, they always seem pretty confident in what they are doing, but it never shows the training and how much work you have to go through to get to the end result. They always just take their time walking around and do lots of talking in TV shows when that's not the case at all in this video. It's get in and get out with as much evidence as possible. The TV show always has a successful ending when the hour ends, which is not the case in real life.

Answer:

I think it would be B. But your lymph nodes swell when you are sick because of irritation and infection.

Explanation:

The complete, balanced chemical reaction for the reaction between gold (Au) and selenic acid (H2SeO4) is: 4Au + 3H2SeO4 → 2Au2(SeO4)3 + H2SO3 + H2O. The coefficients for the reactants and products are as follows: 4 for Au, 3 for H2SeO4, 2 for Au2(SeO4)3, 1 for H2SO3, and 1 for H2O. The type of chemical reaction is a single displacement reaction.

The balanced chemical equation for the reaction between gold (Au) and selenic acid (H2SeO4) is:

4Au + 3H2SeO4 → 2Au2(SeO4)3 + H2SO3 + H2O

In this equation, the coefficient in front of Au is 4, indicating that 4 moles of gold are involved in the reaction. The coefficient in front of H2SeO4 is 3, indicating that 3 moles of selenic acid are present.

On the product side, the coefficient in front of Au2(SeO4)3 is 2, indicating the formation of 2 moles of gold selenate. The coefficient in front of H2SO3 is 1, representing the formation of 1 mole of sulfurous acid. The coefficient in front of H2O is also 1, indicating the production of 1 mole of water.

Based on the reactants and products involved, the type of chemical reaction is a single displacement reaction, as gold displaces hydrogen in selenic acid to form gold selenate.

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The dominant transport mechanism in the lake is diffusion. The water treatment plant has a limited time before it needs to start treating for manganese, and the minimum height above the lake bottom for the water intake to provide one year for designing and installing a manganese treatment system needs to be determined.

Dominant transport mechanism: Diffusion is the main transport mechanism in the lake. This means that manganese is gradually diffusing from the solid deposits at the lake bottom into the water column.

 t = (L^2) / (4D)

where t is the time in seconds, L is the distance from the bottom (1 ft or 30.48 cm), and D is the diffusion coefficient of manganese (6.88×10^(-6) cm^2/s).

Calculation Plugging in the values into the equation, we can calculate the time it takes for manganese to reach the water intake level.

  t = (30.48^2) / (4 × 6.88×10^(-6)) = 126,707 seconds

  Converting seconds to days: 126,707 seconds ÷ (24 hours/day × 3600 seconds/hour) ≈ 1.47 days

  Therefore, the water treatment plant has approximately 1.47 days before it needs to start treating for manganese.

Minimum intake height: To provide one year for designing and installing a manganese treatment system, the intake should be raised to a height where the time it takes for manganese to reach that level is one year.

  t = (L^2) / (4D)

  Rearranging the equation to solve for L:

  L = √(4Dt)

  Plugging in the values: L = √(4 × 6.88×10^(-6) cm^2/s × (1 year × 365 days/year × 24 hours/day × 3600 seconds/hour))

  L ≈ 49.65 cm or 0.163 ft

The minimum height above the lake bottom that the intake should be raised to is approximately 0.163 ft.

The dominant transport mechanism in the lake is diffusion, where manganese is slowly diffusing from the solid deposits into the water column. The water treatment plant has approximately 1.47 days before it needs to start treating for manganese to maintain concentrations below the detection limit. To provide one year for designing and installing a treatment system, the intake should be raised to a minimum height of approximately 0.163 ft above the lake bottom.

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Answer:

it helps in respiration

Answer:

A.

Explanation:

True/false questions require a statement to be either true or false, but the given prompt is incomplete and does not form a statement. Therefore, it cannot be classified as true or false.

However, to provide some clarification, the prompt seems to be asking for a synthesis pathway starting with ethanol and ethyl butanoate. Ethanol (\(C_2H_5OH\)) and ethyl butanoate (\(C_6H_{12}O_2\)) are organic compounds that can be used in organic synthesis to produce other chemicals. One possible pathway for the synthesis of a compound starting with these two compounds is:

Convert ethanol to ethene (\(C_2H_4\)) by dehydrating it with a strong acid such as sulfuric acid.

This synthesis pathway is just one example, and there can be multiple ways to synthesize a compound starting with different starting materials.

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Heat change, ΔH, required to change 52.2 grams of liquid water into steam from room temperature (25 Celsius) to 115 Celsius is 135915.228 J.

The heat change required to change 52.2 grams of liquid water into steam from room temperature (25 Celsius) to 115 Celsius is determined as follows:

Heat change required, ΔH = ΔH₁ + ΔH₂ + ΔH₃

ΔH₁ is heat required to change liquid water at 25°C to water at 100°C

ΔH₁ = mass * specific heat capacity * temperature change

specific heat capacity of water = 4.184 J/g/K

ΔH₁ = 52.2 * 4.184 * (100 - 25)

ΔH₁ = 16380.36 J

ΔH₂ is the heat required to convert water at 100°C to steam at 100°C

ΔH₂ = mass * latent heat of vaporization of water

latent heat of vaporization of water = 2260 J/g

ΔH₂ = 52.2 * 2260

ΔH₂ = 117972 J

ΔH₃ is the heat required to change steam at 100°C to water at 115°C

ΔH₁ = mass * specific heat capacity * temperature change

specific heat capacity of steam = 1.996 J/g/K

ΔH₁ = 52.2 * 1.996 * (115 - 100)

ΔH₁ = 1562.868 J

Heat change required, ΔH = 16380.36 J + 117972 J + 1562.868 J

Heat change required, ΔH = 135915.228 J

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Answer:

Oxygen, heat, and fuel

Explanation:

Oxygen, heat, and fuel are frequently referred to as the "fire triangle." Add in the fourth element, the chemical reaction, and you actually have a fire "tetrahedron." The important thing to remember is: take any of these four things away, and you will not have a fire or the fire will be extinguished.

Answer:

Initial velocity (u) = 0 m/s

Final velocity (v) = 60 m/s

Time (t) = 7 sec

Acceleration (a) = ?

a = (v-u)/t

a = (60-0)/7

a = 60/7

a = 8.57 m/s²

Method: Filtration

Sodium chloride is your everyday common table salt! So it's just separating salt fro. Water!

Procedure: The mixture of salt and sand can be separated by filtration followed by an evaporation process. Filtration can separate sand from a combination of sand and salt solution (salt dissolved in water). Sand stays on the filter paper as a residue after filtering. By boiling the filtrate, common salt may now be produced. Boiling causes all of the water to evaporate, leaving just salt remaining. This is known as evaporation. Thus, this is how salt and sand are separated.

Archimedes' principle allows finding the percentage of material submerged in the fluid and the general relationship that for a body to float is:   Body density must be less than fluid density

Archimedes' principle says that the force of a fluid on a body is equal to the weight of the liquid dislodged

               B = ρ_{fluid} g V_{fluid}

Where B is the thrust, rho and V the density and volume of the fluid, respectively, and g is the acceleration of gravity (g = 9.80 m / s²).

In the attachment we can see a diagram of a body in water, let's apply the equilibrium condition

              Σ F = 0

              B - W = 0

              W = m g

Density is a very useful concept that relates the mass and volume of a body

              ρ = m / V

              m = ρ V

we substitute

             B = ρ_{body} g V_ {body}

In the attachment we see that part of the body is below the fluid, so the volume of fluid dislodged is

              V_ {fluid} = l w h_ {under}

Where V is the volume of fluid dislodged, l and w are the length and width of the body, and h_{under}  is the distance of the submerged body.

We substitute

             ρ_ {fluid} g l w h_ {under} = ρ_ {body} g l w h_ {total}

             \(\frac{\rho_{body}}{\rho_{fluid} } = \frac{h_{under}}{h_{total}}\)          (1)

Let's analyze this expression that gives the ratio of the densities to the ratio of the height of the submerged body.

In the table we give some densities and the height of a body

Material      density        total height    % under

                   ρ(kg/m³)            (m)

water (fluid)    1.00 10³          1.00

Ice                  0.917 10³         0.10            91.7%

Oak                0.710 10³         0.10            71%

Pine                0.373 10³        0.10            37.3%

Aluminum       2.70 10³          0.10          100%

Polyethylene  0.94 10³         0.94           94%

Let's calculate the submerged height, where we will use water as a fluid, let's use equation 1

                 h_ {under}  =  \(\frac{\rho_{body}}{\rho_{fluid}} \ h_{total}\)

Fluid: Water    

Material: Ice

           h under = \(\frac{0.917}{1.00} \ 1.00\)  

           h under = 0.917 m

To calculate the percentage of the sunken body we use

           % under = h_ {under} / h_ {total}

           % under = \(\frac{0.917}{1.00}\)   100

           % under = 91.7%

Material: Pine

             h under = \(\frac{0.373}{0.10} \ 0.10\)

             h under = 0.0373 m

             % under = \(\frac{0.0373}{0.10}\)   100

             % under = 37.3%

Material: Aluminum

            In this case all the matrix is ​​submerged

            %under = 100%

The calculated values ​​are also shown in the last column of the table.

It is observed that for a material to float in another, its density must be less than the density of the fluid, in the case of a ship, the volume of the ship is very large, therefore its apparent density is less than that of water.

In conclusion, using Archimedes' principle we can find the percentage of bound material   and the general generation that for a body to float is:

 material floats in another its density must be less than the density of the fluid

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An area in the United States that would likely experience very low levels of photochemical smog is the Rocky Mountain region, which includes parts of Colorado, Wyoming, Montana, and Idaho.

Photochemical smog is formed when sunlight reacts with pollutants such as nitrogen oxides (NOx) and volatile organic compounds (VOCs) from human activity, such as transportation and industry.

The high altitude of the Rocky Mountains means that the air is thinner, so there is less pollution to react with sunlight. Additionally, the region's low population density means that there are fewer emissions from sources such as cars and factories.

Furthermore, the Rocky Mountain region is characterized by a dry climate, which reduces the potential for the formation of photochemical smog. This is because humidity can help to initiate the chemical reactions that lead to the formation of smog.

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Answer:

N-O bonds in the nitrosyl chloride molecule is 2.5

The balanced equation :

LiI(aq) + AgNO₃(aq) --> AgI(s) + LiNO₃(aq)

Given

Word equation

Required

Balanced equation

Solution

There are 3 ways to express a chemical equation:

Skeleton equation for reaction above :

LiI(aq) + AgNO₃(aq) ⇒ AgI(s) + LiNO₃(aq)

If we look at this reaction, all the cations and anions have a charge of 1 (+1 or -1) so the balanced reaction between the skeleton equation and the balanced equation is the same