Engineers must consider how removing or adding thermal energy changes the energy in materials on the molecular level. Describe how the different
weather conditions would affect the concrete in the roads and what the construction teams might need to consider when choosing materials for each
road.

The amount of gold that can be produced from 213.46g AuPO₄ is equal to 143.7g.

A mole is a standard unit that can be used to determine the huge number of quantities of ions,  atoms, molecules, or other particular particles. The mass of the 1 mole of any element is known as atomic mass (in grams) and the mass of one mole of any compound is called molar mass.

The number of units in one mole was found to be approximately 6.023 × 10 ²³  also called Avogadro’s constant.

Given, the mass of the AuPO₄  = 213.46 g

The molar mass of the AuPO₄ = 197 + 31 + 4(16) = 292 g/mol

The number of moles of the AuPO₄  = 213/292 = 0.729 mol

If the mole of AuPO₄  will produce one mole of the Au.

Then 0.729 mol of the AuPO₄ will produce Au = 0.729 mol

The mass of the Au (in grams) = 0.729 ×197 = 143.7 g/mol

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Taking into account the reaction stoichiometry, 1.25 moles of NO are formed from 3.75 moles of NO₂ if there is plenty of water present.

In first place, the balanced reaction is:

3 NO₂ + H₂O  → 2 HNO₃ + NO

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Amount of moles of NO formed

The following rule of three can be applied: if by reaction stoichiometry 3 moles of NO₂ form 1 mole of NO, 3.75 moles of NO₂ form how many moles of NO?

amount of moles of NO= (3.75 moles of NO₂× 1 mole of NO)÷ 3 moles of NO₂

amount of moles of NO= 1.25 moles

Finally, 1.25 moles of NO are formed.

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1) Check if the chemical reaction is balanced.

2) Moles of NaOH in the reaction.

3) Moles of neutralized acid.

4) Molarity of H2SO4

Answer:

See my photo. I promise it's right.

The relative atomic masses of the elements are:

Lead = 206.96 amu

Magnesium =  24.62 amu

Silicon = 28.08 amu

The relative atomic masses of the given elements from their isotopes is determined as follows:

1. Lead:

Relative atomic mass = (203.973 * 0.014) + (205.974 * 0.236) + (206.759 * 0.226) + (207.9766 * 0.523)

Relative atomic mass = 206.96 amu

2. Magnesium:

Relative atomic mass = (23.985 * 79.99) + (24.986 * 10%) + (25.983 * 11.01%)

Relative atomic mass = 24.62 amu

3. Silicon:

Relative atomic mass = (27.977 * 92.21%) + (28.976 * 4.70%) + (29.973 * 3.09%)

Relative atomic mass = 28.08 amu

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Every substance has a specific temperature range at which it changes from one phase (solid, liquid, or gas) to another.

Measure the melting, boiling, and/or sublimation points of several substances using a realistic melting point device to see what these phase changes appear like on a tiny scale.

Make assumptions about the relative potency of the forces binding these compounds together based on the transition points.

By placing a small amount of an organic solid into a capillary tube, attaching it to the thermometer's stem in the centre of a heating bath, and gradually heating the bath, one can ascertain the temperature at which melting starts and ends.

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To calculate this, we can use fractions for equivalent amounts.

So, we have the number of atoms, using the Avogadro's Constant, we know that 1 mol of Mg is approximately 6.02 x 10^23, so:

And since we have the number of atoms of Mg, we can convert to mol of Mg by multiplying by this fraction.

Now, from mol of Mg we can convert to mass using the molar mass of 24.30 g/mol. It says that 24.30 g og Mg is equivalent to 1 mol, so:

So, we have:

Notice that this is presented in a table in the question, so we can now just multiply all of them:

Thus, this is equivalent of approximately 3.00 g of Mg.

Color is a physical property of matter related to a material’s ability to reflect light.

Color is a physical property of chemicals that in most cases comes from the excitation of electrons due to an absorption of energy performed by the chemical.

Color is that portion of the visible spectrum of light that is reflected back from a surface. A color can only be observed in the presence of light.

When light hits a surface, the particles of the object absorbs the colors in the light. However, not all colours are absorbed by the surface as some are reflected. The reflected color is seen as the color of that object.

The color of light coming from an object is what gives it color. Light travels into the eye to the retina located on the back of the eye. The human eye and brain work together to translate light into color.

Therefore, it can be said that a substance's ability to reflect light is color.

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Answer:

0.286 M

Explanation:

This is a great example of a practice problem that requires you to use the formula for dilution calculations.

To make it more interesting, let's assume that you're not familiar with that problem.

The most important thing to remember about a dilution is the the number of moles of solute must remain constant.

That is, the number of moles of solute present in the initial solution must be equal to the number of moles of solute present in the diluted solution.

Since molarity is defined as moles of solute per liter of solution, keeping the number of moles of solute constant allows you to decrease concentration by increasing the total volume of the solution.

195 ml of 0.355 ml NaCl is added to a 0.500 ml volumetric flask and the flask is filled with water. The [ Na⁺ ] concentration in the diluted solution is 138.45 M

Concentration is calculated by dividing a constituent's abundance by the mixture's total volume. Mass concentration, molar concentration, number concentration, and volume concentration are four different categories of mathematical description.

Molarity is the number of moles of solute per liter of solution and mole fraction is the proportion of solute moles to all other moles of substances present. Parts per thousand grams, mass percentage, the ratio of the solute's mass to the solution's mass multiplied by 100.

M₁ V₁ = M₂ V₂

0.355 × 195 = M₂ × 0.500

M₂ = 0.355 × 195 ÷ 0.500

138.45 M

Thus, The [ Na⁺ ] concentration in the diluted solution is 138.45 M

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Answer

B.

Explanation

The diagram shown below correctly shades the S, P, D, F-block of the periodic table:

Comparing the above with the given options, the diagram which correctly shades the f-block of the periodic table in blue will be option B:

The correct way of presenting the given molecule is CH₄, with the number subscripted.

The subscripted numbers indicates how many of the previous element are in the molecule.

If there are no subscripted number after a given element, it means it is a implicit 1.

So, in CH₄, there is no number after C, so it is implicit it is a 1, and after the H there are a 4. This means that we have 1 C atom and 4 H atoms.

C is carbon and H is hydrogen, so:

A molecule of CH₄ consists of 1 carbon atom and 4 hydrogen atoms.

The mass of forsterite Mg₂SiO₄ that contains a million, 1×10⁶ oxygen atoms is 5.819×10⁻¹⁷ g

We'll begin by obtinig the mass of oxygen that contains 1×10⁶ atoms. This can be obtained as follow:

From Avogadro's hypothesis,

6.02×10²³ atoms = 1 mole of oxygen.

But

1 mole of oxygen = 16 g

Thus,

6.02×10²³ atoms = 16 g of oxygen.

Therefore,

1×10⁶ atoms = (1×10⁶ atoms × 16 g) / 6.02×10²³ atoms

1×10⁶ atoms = 2.66×10⁻¹⁷ g of oxygen

Finally, we shall determine the mass of Mg₂SiO₄ that contains 1×10⁶ atoms (i.e 2.66×10⁻¹⁷ g) of oxygen. This can be obtained as follow:

Thus, we can say:

64 g of oxygen is present in 140 g of Mg₂SiO₄.

Therefore,

2.66×10⁻¹⁷ g of oxygen will be present in = (2.66×10⁻¹⁷ × 140) / 64 = 5.819×10⁻¹⁷ g of Mg₂SiO₄

Thus, the mass of Mg₂SiO₄ is 5.819×10⁻¹⁷ g

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The sinking of the ocean crust back into the mantle when it meets continental crust is referred to as subduction , and this process occurs at the ocean trenches.

This is referred to as a geological process which occurs when there is collision between two tectonic plates in the earth in which one of the plate sinks into the mantle underneath the other plate.

During this process of subduction, the ocean crust sinks back into the mantle when it meets continental crust and it occurs mainly at the ocean trenches thereby making the options provided the correct choice.

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The amount that could cause death in a 150 pound person is 675000 mg.

We define the LD 50 as the amount of the substance that could be used to cause mortality in about 50 percent of the population that is undergoing the test. In this case, we have been told that the  LD50 for Allura Red ingested for rats and rabbits is 10,000 mg/kg  an now we are asked for the LD 50 in a person that has a weight of 150-lb.

The first step in the work is to convert the mass of the person from pound to kilogram from here;

Given that

1 pound =  0.45 kilo gram

150 pounds = 150 pounds * 0.45 kilo gram/1 pound

= 67.5 Kg

Now, If

10,000 mg causes mortality in 1 Kg

x mg would cause mortality in 67.5 Kg

x = 675000 mg

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1) The solubility of the ions are;

lead II ions = 6.96 * 10^-4 M

iodide ions = 3.48 * 10^-4 M

2) The Ksp of silver chromate is 8.98 * 10^-22

We know that the Ksp has to do with the equilibrium constant that shows the extent to which a substance dissolves in water. We can see that the equation of the dissolution can be written for each of the reactants.

a) [tex]PbI2 (s) --- > Pb^{2+} (aq) + 2I^{-} (aq)[/tex]

Now we can see that the Ksp is obtained from;

Ksp = [[tex]Pb^{2+}[/tex]] [2[tex]I^{-}[/tex]]^2

Let the solubility be x

Ksp = 4x^3

x = ∛ 1.35 x 10^-9/4

x = 6.96 * 10^-4 M

Hence;

Concentration of lead II ions = 6.96 * 10^-4 M

Concentration of iodide ions =  6.96 * 10^-4 /2 = 3.48 * 10^-4 M

b) In order to obtain the solubility product of the silver chromate solution;

Let the solubility of each of the ions be x

We can see that;

Ksp = [3x]^3 [x]

Ksp = 3x^4

Ksp = 3(4.16 x 10^-6)^4

Ksp = 8.98 * 10^-22

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v/v Concentration is a type of concentration in which we use to determine what would be the percentage of a certain volume of solute (the one with the least volume) by a certain volume of solution (the one with the most volume). The formula for this will be:

%v/v = volume of solute/volume of solution

In this question, we have:

%v/v = 8.7%, which is 0.087

volume of solute = 34.2 mL

Now we add these values into the formula:

0.087 = 34.2/v

v * 0.087 = 34.2

v = 34.2/0.087

v = 393 mL of ethanol solution that contains 34.2 mL of ethanol

The molarity of carbonic acid is 0.063M when titration is done between 47.00mL carbonic acid and 23.82mL of 0.1250M ammonium hydroxide.

Titration is a technique by which we know the concentration of unknown solution using titration of this solution with solution whose concentration is known. To know the end point we use phenolphthalein as indicator. End point is a point where completion of reaction happen

Mathematically

moles or carbonic acid =moles of ammonium hydroxide

[tex]M_{1} V_{1} =M_{2} V_{2} \\M_{1} =Molarity of carbonic acid\\V_{1} =Volume of carbonic acid\\M_{2} =Molarity of ammonium hydroxide\\V_{2} =Volume of ammonium hydroxide[/tex]

Substituting all values

[tex]M_{1}[/tex]=(0.1250×23.82)÷47.00

[tex]M_{1}[/tex]=0.063M

Thus the molarity of carbonic acid is 0.063M

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Answer: i also need help on the same question :(

Explanation:

Answer:

6 N to the left, or -6 N
unbalanced

Explanation:

The forces are two 3 N forces. The forces are additive, so 3+3 = 6, so the answer is 6 N to the left.
Since the net force isn't 0, the forces are unbalanced (aka the block will move since there is a force pushing the block)

Answer:

dwn

Explanation:

Oxalic acid solution is a primary standard because it is highly pure, stable and does not change its concentration with environmental factors. > Coming to option B, Sodium thiosulphate, it is a secondary standard reagent. Sodium thiosulphate is also called hypo.

The pressure inside a tank with a volume can be calculated using Boyle's law. The pressure needed to compress gas of 3700 L is 16.75 atm.

According to Boyle's law the pressure of a system is inversely proportional to its volume. The mathematical expression for a system with pressure Pa and volume  V1 with its final pressure and volume P2 and V2 is written as follows:

P1V1 = P2V2.

The volume of the gas is 3700 L. Assume that it is measured in the atmospheric pressure 1 atm. The width of the spherical tank is 75 cm thus its radius is 37.5 cm.

Volume of the sphere = 4/3 πr³

                                     = 4/3 × 3.14 × (37.5)³

                                     = 220781 cm³ = 220.78 L.

Now the law can be applied as follows:

3700 L ×  1 atm = 220.78 L × P2

P2  = 3700 / 220.78

     = 16.75 atm.

Hence, the pressure needed to fill the air is 16.75 atm.

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According to the chemical equation, the reaction absorbs 54.8 kJ per 2 moles of NH4Cl because that's the stoichiometry coefficient of this molecule.

Now, we need to find the number of moles in each mole of NH4Cl.

Then, we add them to find the molar mass.

This means that 1 mole of NH4Cl equals 53.49 grams.

At last, we multiply the mass of NH4Cl (27.1 g) by two ratios, the first ratio is about the molar mass, and the second ratio is about the amount of heat per moles.

Therefore, the amount of energy that would be absorbed is 13.88 kJ.

According to the stoichiometry, 0.4 ml of hydrogen gas  is produced from 0.2 moles of calcium .

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the given problem, 1 mole of calcium produces 1 mole of hydrogen gas.

Given 0.2 moles of calcium , so mass  of calcium  by number of moles formula,mass=number of moles×molar mass=0.2×40.07=8.014 g

As 40.07 g of calcium produces 2 g hydrogen

∴8.014 g calcium produces 8.014×2/40.07=0.4 ml.

Thus, the volume of hydrogen gas produced from 0.2 moles of calcium at standard temperature and pressure is 0.4 ml.

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The equilibrium constant relates the concentrations of the products and reactants in the chemical equilibrium. To calculate it we can apply the following equation.

For the reaction: aA + bB ---> cC + dD

Equlibrium constant (Ke) will be:

The letters in square brackets refer to the concentration raised to the respective coefficient. Now we replace the known values:

So, the equilibrium constant (Ke) will be 3.2M

The 14 elements that make up the S-block are hydrogen (H), lithium (Li), helium (He), sodium (Na), beryllium (Be), potassium (K), magnesium (Mg), rubidium (Rb), calcium (Ca), cesium (Cs), strontium (Sr), francium (Fr), barium (Ba), and radium (Ra).

The Periodic Table's s-block elements are those in which the final electron enters the most outer s-orbital. Only two groups (1 & 2) are found in the s-block of the Periodic Table because the s-orbital can only hold two electrons.

S block elements' common outer electrical configuration is ns(1-2).

Given that it contains sodium, beryllium, magnesium, and lithium, I am rather certain that it contains alkaline metals.

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Oxygen have 6 valence electrons. It needs only two electrons to get a full outer shell.

Thus, oxygen will gain two electrons.

Answer:

a. Aluminum nitride

Explanation:

The compound AlN is a salt made up of Al and N.

Analyzing the oxidation states of each element, we can see that Aluminum acts with 3+ (because it has only one oxidation state), so Nitrogen need to interact with an oxidation state of 3-, for the molecule to be neutral.

Due to the nitrogen acts with 3- the name of the salt will be Aluminum nitride.

Acetyl group, oxaloacetic acid, coA, citric acid, and other elements are the substates and products required to initiate and finish the TCA cycle.

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Answer:

Na2CO3 + 2HC2H3O2 → CO2 + H2O + 2NaC2H3O2

Explanation:

Label Each Compound With a VariableLabel each compound (reactant or product) in the equation with a variable to represent the unknown coefficients.aNa2CO3 + bHC2H3O2 = cCO2 + dH2O + fNaC2H3O2Create a System of EquationsCreate an equation for each element (Na, C, O, H) where each term represents the number of atoms of the element in each reactant or product.Na: 2a + 0b = 0c + 0d + 1f

C: 1a + 2b = 1c + 0d + 2f

O: 3a + 2b = 2c + 1d + 2f

H: 0a + 4b = 0c + 2d + 3f

Solve For All VariablesUse substitution, gauss elimination, or a calculator to solve for each variable.

Simplify the result to get the lowest, whole integer values.

a = 1 (Na2CO3)

b = 2 (HC2H3O2)

c = 1 (CO2)

d = 1 (H2O)

f = 2 (NaC2H3O2)

Substitute Coefficients and Verify Result

Na2CO3 + 2HC2H3O2 = CO2 + H2O + 2NaC2H3O2

Reactants Products

Na 2 2 ✔️

C 5 5 ✔️

O 7 7 ✔️

H 8 8 ✔️

Since there is an equal number of each element in the reactants and products of Na2CO3 + 2HC2H3O2 = CO2 + H2O + 2NaC2H3O2, the equation is balanced.