Calculate the density of a piece of mass of metal. The rectangular piece of solid metal has the measures of 2.0 cm 3.0 cm in 2.0 is the unidentified
metal has a mass of 40

Answer:

A. 7

(assuming the water is neutral)

Answer..............nvm

Explanation:

If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .

Using the ideal gas law equation:

PV = nRT

n = (PV) / (RT)

= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)

= 42.71 moles

the balanced equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl -> \(ZnCl_{2}\)  + \(H_{2}\)

1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.

The molar mass of zinc is 65.38 g/mol.

Mass of zinc = moles of zinc * molar mass of zinc

= 42.71 moles * 65.38 g/mol

= 2796.96 g

Therefore, the mass of the zinc is 2796.96 grams.

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The characteristics and the type of molecular bond they describe:

1. Bonds found in Halite (between Na⁺ and Cl⁻): Ionic bond

2. Bonds found between Si and O in the Si-O tetrahedron: Covalent bond

3. Bonds inside the water molecule (between the H and O): Covalent bond

4. Bonds that exist between two water molecules: Hydrogen bond

5. Strongest bond type: Covalent bond

6. Weakest bond type: Van der Waals bond

7. Bonds that are used by water to dissolve salt: Ionic bond

The ionic bond is a type of molecular bond found in halite (between Na⁺ and Cl⁻). The Si-O tetrahedron is held together by a covalent bond. The bond inside the water molecule (between the H and O) is also a covalent bond. The hydrogen bond is the type of bond that exists between two water molecules. The covalent bond is the strongest bond type, while the van der Waals bond is the weakest bond type. Water uses the ionic bond to dissolve the salt.

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Answer:

It is the "Bhor's Model"

Explanation:

Nearly two-thirds of the students ranked the electron cloud and Bohr-model as their two most preferred representations. Students invoked ideas from classical mechanics to interpret the electron cloud model and used probabilistic language to describe the Bohr model of the atom.

To solve this we must be knowing each and every concept related to  landslides. Therefore, the given process describe the landslides process.

Slope collapses are essentially natural calamities that occur in a variety of locations across the world. Slope failures, often known as landslides, define a wide range of mechanisms that produce the outward or downward of slope-forming materials such as rock, soil, or landfills.

The down-slope movement of material on Earth is called a slope failure. It is the failure of the slope resulting in transport of debris downhill by sliding, rolling, falling, or slumping. This is an example of slope failure called landslides.

Therefore, the given process describe the landslides process.

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An aqueous solution of potassium hydroxide reacts completely with a solution of hydrochloric acid the products of this reaction are water and potassium chloride.

We have a neutralizing reaction for this reaction. This reaction creates KCl (a salt) and water through the conventional neutralization process of HCl and KOH.

Hydrochloric acid and potassium react, with potassium replacing the acid's hydrogen. The end results are hydrogen gas and a brand-new salt called potassium chloride.

Water and potassium chloride salt are the byproducts of the interaction between potassium hydroxide and hydrochloric acid. Keep in mind that this is an acid-base displacement reaction using hydrochloric acid and potassium hydroxide.

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It is formed via the more/most stable carbocation.

What justification exists for Markovnikov's Rule?

A carbocation is created as a result of the protonation of the alkene by the protic acid. The carbocation that has the most alkyl substituents on its carbon holds the positive charge, making it the most stable carbocation. As a result, the addition of the halide to the carbon that has fewer hydrogen substituents makes up the majority of the product.

Markovnikov's rule

According to the Markovnikov rule, a proton is added to the carbon atom with the greatest number of hydrogen atoms connected in addition to processes involving alkenes or alkynes.

Anti-Markovnikov Rule

According to the Anti-Markovnikov Rule, in addition to reactions between alkenes or alkynes, The carbon atom with the fewest hydrogen atoms linked to it receives the proton.

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Potassium is positively charged inside the cell, sodium is positively charged outside the cell, phosphate is negatively charged inside the cell, and chloride is negatively charged outside the cell.

Blood clotting, muscular movements, acid equilibrium, and fluid control can all be affected when your body is low on electrolytes. Electrolytes aid in the regulation of your heartbeat because your heartbeat is a muscle.

Drinks like isotonic drinks, milk, apple juice, other juice drinks can all help with electrolyte balance and hydration. For the majority of people, maintaining electrolyte levels only necessitates a well-balanced diet and enough water to drink.

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Answer:

43 miles is 227040

hope this helps

Answer: D

Explanation:

D - Decomposition of carbonates into oxide and carbon dioxide

A - Combustion reaction. Combustion of methane to form Carbon dioxide and water.

C - Reaction of reactive metal (Na) and water to form hydroxide.

B - No particular name of the reaction. Usually denoted as a synthesis redox reaction.

Answer:CaCO3  CaO + CO2

Explanation: just took it

Answer:

there are 106 particles

Answer:

[A] Plant shoots are positively phototropic and negatively gravitropic. [B] Plant shoots are negatively phototropic and positively gravitropic. [C] Plant shoots are negatively hydrotropic and positively gravitropic. [D] Plant shoots do not display any major tropisms.

Answer:-Gravitropism. It is a type of tropism where plants show some growth in response to gravity. ...

Chemotropism. There are few chemical substances, which are actively responsible for bringing a curvature movement in plant organs. ...

Thigmotropism. ...

Hydrotropism. ...

Thermotropism.                                                                                                                     The below mentioned article will highlight the six types of tropic movements in plants.

The six types are: (1) Thigmotropism (Haptotropism) (2) Phototropism (3) Geotropism (4) Thermotropism (5) Chemotropism and (6) Hydrotropism.                A tropism is a growth movement whose direction is determined by the direction from which the stimulus strikes the plant. There are two forms: Positive = the plant, or a part of it, grows in the direction from which the stimulus originates. and Negative = growth away from the stimulus.                         tropism is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus. In tropisms, this response is dependent on the direction of the stimulus (as opposed to nastic movements which are non-directional responses).

The two molecules produced by the light reactions and used to power the Calvin cycle are ATP and NADPH.

These molecules provide the necessary energy and reducing power for the conversion of CO2 into organic molecules such as G3P, which ultimately leads to the synthesis of glucose (C6H12O6) and other sugars. RuBP, or ribulose bisphosphate, is a molecule involved in the initial steps of the Calvin cycle, but it is not produced by the light reactions.

Similarly, H2O and O2 are not used to power the Calvin cycle, but are instead involved in the light reactions themselves.
The two molecules produced by the light reactions and used to power the Calvin cycle are ATP and NADPH.

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The positive iodoform test indicates the presence of a methyl ketone or a compound that can undergo oxidation to form a methyl ketone. In the case of C5H8O, two geometric isomers that can give a positive iodoform test are trans-2-pentene-1-ol and cis-3-penten-2-ol. Here are their structures:

Trans-2-pentene-1-ol:

    H

    |

H - C = C - C - C - OH

    |    |

    H    H

Cis-3-penten-2-ol:

    H

    |

H - C = C - C - OH

    |    |

    H    H

Both of these isomers have the empirical formula C5H8O and can undergo oxidation to form a methyl ketone, which will react with iodine and hydroxide ions to produce a yellow precipitate of iodoform.

It's important to note that the structures provided are examples of geometric isomers that fit the given empirical formula and can give a positive iodoform test. The actual arrangement of atoms in space may vary depending on the specific isomer.

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Answer:

no they dont

Explanation:

Airborne Gases Composure of the atmosphere The byproducts of the species that are really nourished by this have a significant influence on the composition of the Earth's environment.

Dry air from the earth's atmosphere contains 0.038% of carbon dioxide, 20.95% of oxygen, 78.08% of nitrogen, and 0.93% of argon.

The environment, a layer of gases that regulates temperatures within a specific range and deflects dangerous solar radiation, covers all life on Earth.

The atmosphere is the term used to describe the layer of gases that covers the Earth and contains the air we breathe. It remains near the planet's surface due to the gravitational attraction of its neighbour, Earth. Utilize a barometer to determine the air pressure. Nitrogen, oxygen, and argon make up the atmosphere's three main constituents.

One or more compounds completely change in composition as a result of chemical change from the original substances. The reaction reorganises the initial components and/or compounds into new product compounds or elements. The original matter's chemical makeup is changed via a chemical change.

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Answer:

4

Explanation:

Answer:

12.60 m has 4 significant figures.

Explanation:

On Edge 2021

A battery is a device that converts chemical energy into electrical energy through a process known as an electrochemical reaction.

When a battery is connected to a circuit, the electrochemical reaction causes a flow of electrons from the anode to the cathode, generating an electric current that can power a device.

The metal chosen for the anode must be capable of losing electrons easily, while the metal chosen for the cathode must be capable of accepting electrons. The choice of metals can also affect the voltage and capacity of the battery, as well as its overall efficiency.

In general, the metals used in a battery should have a large difference in their electronegativity values, which determines how easily an atom can attract electrons. Common metals used in batteries include zinc, lithium, nickel, and cadmium.

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Answer:

adaptation?

Explanation:

Answer: Mass of Ca(OH)2 formed will be 777g.

Explanation:

As from the reaction we can see,

2 moles of Al(OH)3 gives   3 moles of Ca(OH)2.

1 mole of Al(OH)3 gives   3/2  moles of Ca(OH)2.

7 moles of Al(OH)3 gives   ((3/2)x 7)  moles of Ca(OH)2.

7 moles of Al(OH)3 gives   (21/2)  moles of Ca(OH)2.

So, no. of moles of Ca(OH)2= 21/2 mole

Molar mass of Ca(OH)2 = 74 g/mole

Mass of Ca(OH)2 = No. of moles x Molar mass

                            = (21/2) x 74

                              = 777g

The concentration of the solution will be 0.073 M.

To solve this problem, we need to use the concept of stoichiometry and the equation for the reaction given.

The balanced net ionic equation for the reaction is not given in the question, so we cannot provide a numerical answer. Please provide the balanced net ionic equation for the reaction. Once we have that, we can proceed with the calculation.

Assuming the balanced net ionic equation for the reaction is;

A + B → C + D

where A represents the substance in the solution we are trying to determine the concentration of, and B represents the titrant (0.1371 M solution), we can use the following equation to calculate the concentration of A;

M_A = (M_B x V_B) / V_A

where M_A is the concentration of A, M_B is the concentration of the titrant, V_B is the volume of titrant used, and V_A is the volume of the solution.

Substituting the given values into the equation, we get;

M_A = (0.1371 M x 21.24 mL) / 40.00 mL

M_A = 0.073 M

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Gasohol is a blend of gasoline and ethanol. To determine the maximum work that can be obtained by burning 1.003 mol of C2H5OH at 25°C and 1 atm, the Gibbs free energy equation can be utilized. What is Gibbs free energy equation? Gibbs free energy equation is a thermodynamic equation that quantifies the maximum quantity of work that may be obtained during a chemical reaction. T

he equation is as follows: ΔG = ΔH - TΔSThe values of ΔH and ΔS are calculated from thermodynamic tables or by calculating the enthalpy and entropy of the products and reactants, and the temperature, T, is usually specified in Kelvin. The change in Gibbs free energy, ΔG, is the maximum amount of energy that can be obtained from the reaction in the form of useful work if the reaction takes place at constant pressure and temperature. The reaction will proceed spontaneously if ΔG is negative. And if ΔG is positive, the reaction will not take place spontaneously. The solution to this problem is shown below:

First, let's figure out how much heat is produced when one mole of C2H5OH is burnt.ΔHrxn = [2(moles of CO2)(-393.5 kJ/mol) + 3(moles of H2O)(-285.8 kJ/mol)] - [(moles of C2H5OH)(-277.7 kJ/mol)]ΔHrxn = [2(2.006 mol)(-393.5 kJ/mol) + 3(3.009 mol)(-285.8 kJ/mol)] - [1.003 mol(-277.7 kJ/mol)]ΔHrxn = -2043.5 kJ/mol. Now, we'll figure out the entropy change for the reaction.ΔSrxn = [2(moles of CO2)(213.8 J/mol-K) + 3(moles of H2O)(69.9 J/mol-K)] - [(moles of C2H5OH)(160.7 J/mol-K)]ΔSrxn = [2(2.006 mol)(213.8 J/mol-K) + 3(3.009 mol)(69.9 J/mol-K)] - [1.003 mol(160.7 J/mol-K)]ΔSrxn = -104.3 J/mol-KThe temperature in Kelvin is 25°C.273 + 25 = 298 KΔG = ΔH - TΔSΔG = -2043.5 kJ/mol - (298 K)(-104.3 J/mol-K)/1000ΔG = -2032.6 kJ/mol. Therefore, the maximum work that can be obtained by burning 1.003 mol of C2H5OH is 2032.6 kJ/mol, which is the value of ΔG.

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Answer:

3.8857037037g per cm3

Explanation:

52.357g/13.5 cm3 = 3.8857037037

Round if needed

There are total three laws of newtons, first law of newtons, second law of newton and third law of newton. Therefore, for every action there is an equal and opposite reaction.

Newton's first law is also called law of inertia. An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Third law of newton states  that for every action there is an equal and opposite reaction.

Therefore, for every action there is an equal and opposite reaction.

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Geologists use the following tests to distinguish minerals and the rocks they make: hardness, color, streak, luster, cleavage and chemical reaction.

Answer:

The answer is C: Catalysts provide a lower energy pathway for reaction

Explanation:

Took the test

To solve such this we must know the concept of chemical reaction. Therefore, the correct option is option C that is catalysts provide a lower energy pathway for the reaction.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

There are many factors that affects the rate of chemical reaction. Out of those factors catalyst play an important role in determining the rate of reaction. Catalysts provide a lower energy pathway for the reaction.

Therefore, the correct option is option C that is catalysts provide a lower energy pathway for the reaction.

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