Determine the average density if the results for three trials were: 3.5512 g/mL, 3.4188 g/mL and
3.8617 g/mL.

Answer:

The unknown compound probably contains a chromophore, which is a structural element that causes a compound to have a specific color. The addition of an oxidizing agent such as chlorine water causes the appearance of a brown color, indicating that the compound contains an electron-rich chromophore. The fact that the organic solvent layer turns purple when the solution is shaken with methylene dichloride suggests that the compound also contains a chromophile, which is a structural element that can form a complex with an electron deficient species like the dichloromethane solvent. The compound probably contains a conjugated system of double bonds, which can act as both chromophore and chromophile, and that is why the color changed from brown to purple after shaking with the organic solvent.

ln a = −1.1491 − 3.6697 × 10−3t

The first order integrated rate law is

kt = ln (a0/a)

ln a=ln a0 − kt  

A plot of ln(a) vs. t would, therefore, yield a straight line whose slope will be equal to −k. The result of the linear regression (Excel can easily do this) is

ln a = −1.1491 − 3.6697 × 10−3t

Therefore, the rate constant is 3.6697 × 10−3 s−1. Note that the intercept has approximately the correct value of ln a0.

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Explanation:

square pyramidal

T-shaped

octahedral

Photosynthesis will be greatest at 30% light intensity according to the graph.

Light intensity affects photosynthesis by providing the energy needed for the process to occur. At low light intensities, photosynthesis proceeds at a slower rate, while at higher light intensities, photosynthesis proceeds at a faster rate. At 30% increase, rate of photosynthesis will increase.

However, if the light intensity is too high, it can damage or kill the plant, as it can cause the temperature inside the leaf to rise, leading to thermal stress. This can lead to a decrease in the rate of photosynthesis, or even a complete cessation of the process.

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The molecular weight of CuSO4 · 5H2O is 249.69 g/mol, so 220.0 g of CuSO4 · 5H2O would contain 0.88 mol of CuSO4 · 5H2O.

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The following compounds should be ranked in order of increasing acidity, starting with the least acidic compound at the top: SiH4, H2S, PH3.

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The percentage by mass of each metal in the jewelry is given as :

The percentage by mass of gold is : (mass of gold / total mass of jewelry) x 100% = (10.65 g / 7.74 g) x 100% = 137.5%

and the percentage by mass of copper is : (mass of copper / total mass of jewelry) x 100% = (4.91 g / 7.74 g) x 100% = 63.5%

Question 2

The piece of red gold jewelry has a purity of : (137.5%) x 24 = 33 carats

percentage by mass is described as a way of expressing a concentration or describing the component in a particular mixture.

We know that the piece of red gold jewelry contains 137.5% gold and 63.5% copper by mass.

To calculate the carats, we will use the formula:

carats = (percentage of gold in alloy) x 24

Therefor, the piece of red gold jewelry has a purity of : (137.5%) x 24 = 33 carats.

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Answer:

5.67 cm^2

Explanation:

Two or more substances in variable proportions, where the composition is constant throughout, are known as homogeneous mixtures.

A homogeneous mixture is a mixture where the composition is uniform throughout and the components of the mixture are not visually distinguishable. Examples of homogeneous mixtures include solutions, suspensions, and colloids.

Colloids are homogeneous mixtures of two or more substances in which the particles of one substance are dispersed evenly throughout the particles of the other. The particles in a colloid are usually intermediate in size between those of a solution and those of a suspension, and they do not settle out. Examples of colloids include milk, fog, and paint.

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Answer:

d = (2.998 x 10^8 m/s) * (5.0 x 10^-6 s)

Explanation:

Answer: A) The amount of air in a room never changes.

It is a state of balance between opposing forces or actions that is either static (as in a body acted on by forces whose resultant is zero) or dynamic (as in a reversible chemical reaction when the rates of reaction in both directions are equal).

Economic equilibrium is a condition or state in which economic forces are balanced. In effect, economic variables remain unchanged from their equilibrium values in the absence of external influences.

a) The amount of air in a room never changes: the amount of air does not change as the amount of air leaving the room is same as that of the air entering the room and hence the  reaction is in equilibrium.

b) The amount of water in a cup decreases as it evaporates: The amount of water is decreasing that means the reaction is taking place in one direction and hence the reaction is not in equilibrium.

c) The percentage of nitrogen gas in a room decreases steadily: the amount decreases that means the reaction is taking place in one direction and hence the reaction is not in equilibrium.

d) A blade of grass grows taller : the plant gets taller that means the reaction is taking place in one direction and hence the reaction is not in equilibrium

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Answer:

The theory of seafloor spreading explains how new crust is created at mid-ocean ridges.

Explanation:

This theory proposes that the Earth's crust is made up of tectonic plates that move and spread apart from each other, allowing molten material from the mantle to rise up and fill the gap, forming new crust. This process of plate tectonics also explains the formation of mountain ranges, volcanoes, and earthquakes.

To convert a speed of 931 cm/s to inches per minute, we can use the conversion factor of 1 inch = 2.54 cm.

931 cm/s x (1 inch/ 2.54 cm) x (60 seconds/minute) = 34,843.58 inches/minute

Unit Analysis:

931 cm/s x (1 (inch) / 2.54 cm) x (60 (seconds/minute)) = 34,843.58 inches/minute

Each functional group has a particular set of chemical properties that it to be identified.

The maximum amount of solute that can dissolve in a known quantity of solvent at a certain temperature is its solubility.

The solubility of the compound is determined as the concentration of unionized compound in solution when the measured pH slope is interpolated to zero.

These properties can be demonstrated by observing solubility behavior, while others can be in chemical reactions that are accompanied by color changes, precipitation formation, or other visible affects.

According to the presence of their functional group, organic compounds can be classified in different families and class.

The types of compounds soluble in a particular solvent are summarized on the following:

Water Soluble Compounds

5% Sodium Hydroxide Soluble Compounds

5% Sodium Bicarbonate Soluble Compounds

5% Hydrochloric Acid Soluble Compounds

96% Sulfuric Acid Soluble Compounds

Solubility of Amphoteric Compounds

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Answer:

The total mass of all substances and the total number of atoms of each element will always be the same before and after a chemical reaction, this is based on the Law of Conservation of Mass and the Law of Conservation of atoms. This law states that in any chemical reaction, the total mass of the reactants is equal to the total mass of the products and the number of atoms of each element is conserved.

Explanation:

To calculate the amount of sucrose needed to make a 2 L of a 2 M solution, you can use the formula:

moles = concentration (M) * volume (L)

moles of sucrose = 2 M * 2 L = 4 moles

Then, convert moles to grams using the molecular weight of sucrose (342.30 g/mol)

grams of sucrose = 4 moles * 342.30 g/mol = 1369.2 g

So, you would need 1369.2 g of sucrose to make a 2 L of a 2 M solution.

The pH of Glutamic acid is 3.94. The net charge is a negative charge and the pH of Histidine is 6.30.

To calculate the pH of glutamic acid when the gamma carboxylic acid is 30% dissociated, we need to know the dissociation constant (pKa) of the group. The pKa of the gamma carboxylic acid of glutamic acid is around 4.3.

To find the pH, we need to use the Henderson-Hasselbalch equation, which is:

pH = pKa + log([A-]/[HA])

where [A-] is the concentration of the dissociated form and [HA] is the concentration of the undissociated form of the acid. If 30% of the carboxylic acid is dissociated, then [A-]/[HA] = 0.3/0.7 = 0.43.

So, the pH = 4.3 + log(0.43) = 4.3 + (-0.36) = 3.94

1B. To determine the net charge on the molecule, we need to consider the dissociation of both the alpha carboxylic acid and the gamma carboxylic acid. At the pH of 3.94, both the alpha and gamma carboxylic acids are partially dissociated and carry a negative charge. The exact charge depends on the exact dissociation of each group and the overall molecular structure. In general, the net charge on the molecule is dependent on the pH and the dissociation constants of the functional groups.

To calculate the pH of histidine when the alpha amino group is 2/3 dissociated, we need to know the dissociation constant (pKa) of the group. The pKa of the alpha amino group of histidine is around 6.0.

We can use the Henderson-Hasselbalch equation to find the pH:

pH = pKa + log([NH2-]/[H2N-H])

where [NH2-] is the concentration of the dissociated form and [H2N-H] is the concentration of the undissociated form of the acid. If 2/3 of the amino group is dissociated, then [NH2-]/[H2N-H] = 2/3 / (1/3) = 2.

So, the pH = 6.0 + log(2) = 6.0 + 0.301 = 6.30

Note that the pH calculated here is just an estimate and the exact pH would depend on the other functional groups present in the molecule and their dissociation constants.

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The ionization constant for the given chemical equation is 5.82 as shown in the calculations.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

Ionization constant is given as , [H₃O[tex]^+[/tex]][Cl[tex]^-[/tex]]/[HCl]=[13.3][7.4]/[16.9]=5.82

Thus, the The ionization constant for the given chemical equation is 5.82 .

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1.00 x 10^3 kg of sulfur can produce 661.94 kg of sulfuric acid.

To calculate the amount of sulfuric acid that can be made from 1.00 x 10^3 kg of sulfur:

First, the amount of sulfur dioxide produced from 1.00 x 10^3 kg of sulfur can be calculated:

1.00 x 10^3 kg x 92.5% = 925 kg of sulfur dioxide

Next, the amount of sulfur trioxide produced from the sulfur dioxide can be calculated:

925 kg x 72.6% = 673.67 kg of sulfur trioxide

Finally, the amount of sulfuric acid produced from the sulfur trioxide can be calculated:

673.67 kg x 98.2% = 661.94 kg of sulfuric acid

Therefore, 1.00 x 10^3 kg of sulfur can produce 661.94 kg of sulfuric acid.

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The name of each compound is:

An ether molecule consists of two hydrocarbon groups connected by an oxygen atom. This type of molecule is an organic compound which is characterized by its low boiling and melting points, and its low solubility in water. Ether molecules are widely used in organic synthesis and as solvents.

These molecules are highly flammable and can be explosive when mixed with air. They are also highly volatile, meaning that they can easily evaporate into the atmosphere and can be difficult to contain. Because of these properties, ether molecules are often used as a fuel in small engines and rockets.

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Answer:

0.139

Explanation:

The molarity of the solution is 1.09 M

Manganese (II) sulfate  chemical formula is MnSO₄ As a result, we begin by determining its molecular weight (Mw) as follows:

Mw MnSO₄= molar mass Mn + molar mass S) + (4 x molar mass 0)

Mw MnSO₄= 55 g/mol + 32 g/mol + (4 x 16 g/mol) = 151. g/mol

The number of moles in the given mass of MnSO₄ is then determined using Mw:

moles MnSO₄= mass/Mw

moles MnSO₄= 20.7 g/(151g/mol)= 0.137 mol

moles MnSO₄ = 0.137 mol

We now convert the value from mL to L because we need the final volume in liters:

125 mL x 1 L/1000 mL = 0.125 L

In order to calculate the molarity in mol/L, we divide the moles of Mn(NO₃)₂ into the volume in L.

M= 0.133 moles/0.125 L = 1.06 mol/L= 1.09 M

Your question is incomplete but most probably your full question was

In the laboratory you dissolve 20.7 g of manganese(ii) sulfate in a volumetric flask and add water to a total volume of 125 ml. What is the molarity of the solution

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Answer:

The initial temperature of the carbon graphite before it was added to the water was 31.69°C.

Explanation:

To calculate the initial temperature, we need to use the formula for heat:

Heat = Specific heat capacity x mass x change in temperature

The heat absorbed by the water is:

Heat absorbed by water = 4.18 J/g°C x 60 g x (24°C - 20°C) = 10,212.8 J

The heat absorbed by the carbon graphite is:

Heat absorbed by carbon graphite = 0.709 J/g°C x 20 g x (Tinitial - 20°C) = 1418.Tinitial - 28360

Since heat is conserved, the heat absorbed by the carbon graphite is equal to the heat absorbed by the water:

1418.Tinitial - 28360 = 10,212.8 J

Tinitial = (10,212.8 + 28360) / 1418 = 31.69°C

The initial temperature of the carbon graphite before it was added to the water was 31.69°C.

We can calculate evapotranspiration by using the formula, ET=P-R-TWSC, where P is precipitation, R is runoff and TWSC is change in terrestrial water change.

Evapotranspiration is defined as water evaporation into the atmosphere from the soil surface, evaporation from the capillary fringe of the groundwater table, and evaporation from water bodies on land. Generally, evapotranspiration also includes transpiration, which is the water movement from the soil to the atmosphere through plants.

When we want to estimate the ET (evapotranspiration) using the water balance method: ET=P-R-TWSC, where P is precipitation, R is runoff and TWSC is change in terrestrial water change.

This question is incomplete so I have answered on general basis.

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Answer:

The limiting reactant is the reactant that is completely consumed before the other reactant(s) in a chemical reaction. To find the limiting reactant, we need to find how much product is formed from each reactant, and then compare which reactant forms the least amount of product.

The balanced equation for the reaction is 4H2O+7CO2---> C7H8+9O2

From the given data, we have 50g of H2O and 250g of CO2.

We can calculate the limiting reactant by using the stoichiometry of the equation.

The stoichiometry is the relationship between the amount of reactants and products in a balanced chemical equation.

From the balanced equation, we know that 4 moles of H2O and 7 moles of CO2 are needed to produce 1 mole of C7H8 and 9 moles of O2.

From the data we have, 50g of H2O is equivalent to 2.86 moles H2O.

And 250g of CO2 is equivalent to 5.36 moles of CO2.

Now, using the balanced equation, we can calculate the amount of product that forms from each reactant:

From 2.86 moles of H2O: 2.86 moles H2O * (1 mole C7H8 / 4 moles H2O) = 0.715 moles C7H8

From 5.36 moles of CO2: 5.36 moles CO2 * (1 mole C7H8 / 7 moles CO2) = 0.766 moles C7H8

As we can see, the CO2 is the limiting reactant because it forms less product than H2O.

The amount of excess reactant is the amount of the reactant that is not used up in the reaction, we can calculate this by subtracting the amount of product that forms from the limiting reactant from the initial amount of the reactant.

Excess reactant of H2O is 50g - (0.715 moles * 18.02g/mol) = 37.5g

Excess reactant of CO2 is 250g - (0.766 moles * 44.01g/mol) = 191g

So, the limiting reactant is CO2 and there is 191g of excess CO2 leftover.

Explanation: In a chemical reaction, the limiting reactant is the reactant that is completely consumed before the other reactant(s) run out. The limiting reactant determines the maximum amount of product that can be formed.

To determine the limiting reactant, we need to calculate the number of moles of each reactant present.

The moles of H2O: 50g/18g/mol = 2.778 moles

The moles of CO2: 250g/44g/mol = 5.68 moles

Next, we can use the coefficients in the balanced chemical equation to find the number of moles of each reactant required to react with each other.

The number of moles of H2O required: 4 moles H2O / 4 moles H2O/1 mole C7H8 = 1 mole C7H8

The number of moles of CO2 required: 7 moles CO2 / 1 mole C7H8 = 7 moles CO2

From the above we can see that H2O is the limiting reactant since it is consumed before the CO2.

To calculate the excess reactant, we subtract the number of moles of the limiting reactant from the number of moles of the other reactant.

The excess moles of CO2 = 5.68 moles - 1 mole = 4.68 moles

The excess moles of H2O = 0 moles (since H2O is limiting reactant)

The mass of the excess CO2 = 4.68 moles x 44 g/mol = 205.12 g

So, CO2 is the excess reactant and 205.12 g of CO2 is leftover.

The melting of the candle wax and the burning of the candle wick are physical changes, as the molecules of the wax and wick have been rearranged and heated but their chemical composition has not changed.

The glass jar getting hot and the soot being deposited on the inside of the jar are both chemical changes, as the molecules of the glass and the soot have been chemically altered.

Chemical changes occur when a substance undergoes a chemical reaction, resulting in the formation of new substances.

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1 kPa is equal to 0.145038 PSI. Pascal or kilopascal, as well as in many other units including torr, atmosphere, and bar.

A gas’s pressure can be represented in the SI units of pascal or kilopascal, as well as many other units such as torr, atmosphere, and bar. A barometer is used to measure atmospheric pressure; other gas pressures can be measured with one of various types of manometers.

Millimeters of mercury (mm Hg) is the most often used pressure unit. Pressure is commonly measured in atmospheres. One atmosphere of pressure (atm) is equal to 760 millimeters of mercury (mm Hg). Pressure is represented in SI in derived units called pascals. At a temperature of 60 degrees Fahrenheit and an atmospheric pressure of 14.7 pounds per square inch, gas is frequently measured in cubic feet. Production of natural gas

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Answer:

313.52 pm

Explanation:

Perhaps you should check your working:

[tex]\frac{1 * 154}{2 * 0.2456}[/tex]

≈ 313.52

(I have used a calculator lol, my arithmetic skills are terrible when I am not dealing with numbers in scientific notations)

Hope this helps :)

If the person drops the ball, its velocity gets bigger and bigger as it falls.

What effect does gravity have on a falling ball?

When something falls, it is due to gravity. Because the item feels a force, it accelerates, causing its velocity to increase as it falls. A sort of acceleration is the force with which the Earth pushes on something in the form of gravity. The Earth exerts the same amount of force on everything.

Gravity is the force that causes objects to fall to the ground. When you drop a ball (or anything else), it falls to the ground. Everything falls at the same rate due to gravity. When you drop the ball, gravity pulls it down and accelerates it. It collides with the ground and squashes at contact. As the squished ball recovers its former shape

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Complete question:

The diagram below shows a person holding a ball standing at three different places on earth. if the person drops the ball, gravity will make it fall.

Which of the following diagrams best shows the direction the dropped ball will fall at the three different positions?

b. b

a. a

c. c

d. d

The volume of the gas at 40 degrees C, given that it's volume was 60 L at 301.5 K is 62.3 L

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

Using Charles' law equation, we can obtain the volume of the gas at 40 degrees C as illustrated below:

V₁ / T₁ = V₂ / T₂

60 / 301.5 = V₂ / 313

Cross multiply

301.5 × V₂ = 60 × 313

301.5 × V₂ = 18780

Divide both side by 301.5

V₂ = 18780 / 301.5

V₂ = 62.3 L

Thus, we can conclude from the above calculation that the new volume of the gas is 62.3 L

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The new volume of the gas is 62.3 L.

We have to use the Charles law here. In this law, the volume of a gas is directly proportional to its temperature (in kelvins), provided that the pressure and number of moles of the gas remain constant. It can be expressed as: V/T = k, where V is the volume, T is the temperature in kelvins, and k is a constant.

We have that;

V1/T1 = V2/T2

V1 = initial volume]

V2 = final volume

T1 = initial temperature

T2 = final temperature

Then;

V1T2 = V2T1

V 2 = V1T2 /T1

V2 = 60 * 313/301.5

V2 = 62.3 L

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