why are the repirometers incubated at 37 degrees C in this experiment instead of a cooler temperature?

The  image that have been shown can be said to depict a weak base. Option A

A weak base is a material that, when exposed to water, partially ionizes or dissociates, producing hydroxide ions (OH-) and their conjugate acid. Weak bases only produce a minor concentration of hydroxide ions in an aqueous solution, in contrast to strong bases, which totally dissociate and produce a significant concentration of hydroxide ions.

Weak bases have a comparatively low affinity for protons because of their restricted capacity to receive protons (H+) from water.

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Among the 4 given statements, option D: The value of Kw shows that water is a weak acid is the incorrect statement. Kw is ion product constant.

The ion product constant (Kw) is the product of the concentrations of hydrogen ions (H⁺) and hydroxide ions (OH⁻) in aqueous solution. It is used to measure the acidity or basicity of a solution, with a Kw of 1.0 x 10⁻¹⁴ at 25 °C for pure water. The value of Kw changes with temperature and is a measure of the strength of the solvent, indicating whether it is a stronger acid or base.

The value of Kw (ion product constant for water) is a measure of the strength of the self-ionization of water, which can be represented by the equation H2O ⇌ H⁺ + OH⁻. The fact that Kw has a very small value (1.0 × 10⁻¹⁴) indicates that the self-ionization of water is a very weak reaction.

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Therefore, the original volume of the balloon was 939 m³.

Volume is a measure of the amount of space occupied by a three-dimensional object or substance. It is a physical quantity that can be described as the amount of space that an object or substance takes up in three dimensions, which can be measured in cubic units such as cubic meters, cubic feet, or liters. In mathematical terms, the volume of an object is calculated by multiplying its length, width, and height together. For example, the volume of a rectangular box with length L, width W, and height H can be calculated as V = L x W x H.

Here,

To solve this problem, we can use the ideal gas law:

PV = nRT

where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of gas, R is the gas constant, and T is the temperature of the gas in Kelvin.

We can use the ideal gas law to solve for the original volume of the balloon, assuming that the number of moles of gas and the gas constant remain constant.

First, we need to convert the temperatures to Kelvin:

20°C + 273.15 = 293.15 K (initial temperature)

-56°C + 273.15 = 217.15 K (final temperature)

Next, we can use the ideal gas law to solve for the number of moles of gas in the balloon at the initial conditions:

n = PV/RT

n = (101 kPa)*(V)/(8.31 J/mol·K)*(293.15 K)

Simplifying:

n = 0.00407V

We can use this expression to solve for the initial volume of the balloon, since we know that the final volume is 35.4 m³ and the pressure, temperature, and number of moles of gas are all constant:

n = (11.7 kPa)*(35.4 m³)/(8.31 J/mol·K)*(217.15 K)

Simplifying:

n = 0.00407V

Solving for V, we get:

V = n(8.31 J/mol·K)*(293.15 K)/(101 kPa)

V = 939 m³

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Answer:

16.0 gms

Explanation:

what is the mass of 1 mole of O atoms to 3 significant figures

    go to your periodic table.......O is element  8 and has an atomic mass of 15.999.  to 3 significant figures, this rounds to 16.0

1 mole is the molar mass in grams

so 1 mole of O atoms has a weight of 16.0 gms

Answer:

129.02 g/mol.

Explanation:

We apply grahams law of diffusion:

1/8 = √2.016/√m     where m = molar mass

√m  = 8√2.016

m =   (8√2.016) = 129.02 g/mol.

In this question, we need to find the value of pressure of a 15 grams sample of CO2 gas, and in order to find this value, we will be using the Ideal gas law formula, which is the following:

PV = nRT

Where:

P = pressure in atm

V = volume in liters, 20 Liters

n = number of moles

R = gas constant, 0.082

T = temperature in kelvin, 0°C = 273 K

The number of moles we need to find based on the mass in the question and based on the molar mass of CO2, 44g/mol:

44g = 1 mol

15g = x moles

44x = 15

x = 15/44

x = 0.34 moles of CO2 in 15 grams

Now we have the values to add to the formula:

P * 20 = 0.34 * 0.082 * 273

20P = 7.61

P = 7.61/20

P = 0.38 atm of pressure

The pressure will be 0.38 atm

Answer:it was seen as unnecessary because they could handle their own affairs

Explanation:

Answer:

It was seen as unnecessary, because the states should govern their own affairs.

Explanation:

I just took the quiz, plus it makes the most sense :))

The mass of the glass is 1 gram.

What is specific heat capacity?

 This refers to the amount of heat in joules (J) absorbed per unit mass (kg) of the material when its temperature rises 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

From the question:

cp= 0.20 cal/(g°C)

T = 150°C

heat added = 30 cal

To find the mass of the glass, you can use the formula:

mass = heat added / (specific heat capacity x temperature change)

Substituting the given values:

mass =           30 cal

              (0.20 cal/(g°C) x 150°C)

mass =             30

                 (0.20 x 150)

mass       = 30

                  30

mass = 1 g

Hence, the mass of the glass is 1 gram.

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A reaction is said to have reached equilibrium when the reaction rate is equal in both directions (c).

Like, take the example of copper in copper sulphate solution. When you add Cu to CuSO4 soln., there won't be any change occurring as the reaction rate is equal (Cu is added to CuSO4 soln., there won't be any change as displacement reaction won't take place due to Cu being the same metal as in CuS04 soln...their reaction is the same).

_____

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The correct formula for the compound formed between barium and sulfur is BaS. Ba

The correct formula for the compound formed between barium and sulfur is BaS. Ba represents the chemical symbol for barium, and S represents the chemical symbol for sulfur. When barium and sulfur combine, they form an ionic compound with a 1:1 ratio of barium ions (Ba2+) and sulfide ions (S2-). The compound BaS indicates that one barium atom combines with one sulfur atom to form an ionic compound. In BaS, barium has a 2+ charge (Ba2+), and sulfur has a 2- charge (S2-).

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Answer:

3 Types of Water: Mineral, Spring and Prepared Water

The final gas volume, O, could be either larger or smaller than 2.96 L, depending on the final pressure and temperature. While heating the gas to a higher temperature, O could be larger than 2.96 L, but it could also be smaller.

The final gas volume, O, could be either larger or smaller than 2.96 L, depending on the final pressure and temperature. To understand why, we can look at the ideal gas law equation, PV = nRT. In this equation, P represents pressure, V represents volume, n represents the number of moles of gas, R is the gas constant, and T represents temperature.

Let's analyze the situation given in the question. We have a sample of xenon gas at a temperature of 306 K and a pressure of 0.847 atm, occupying a volume of 2.96 L. Now, if the pressure of the gas is decreased, while at the same time it is heated to a higher temperature, the final gas volume, O, could be either larger or smaller than 2.96 L.

If we decrease the pressure while keeping the temperature constant, according to Boyle's law, the volume of the gas will increase. So, in this case, O would be larger than 2.96 L. However, if we simultaneously increase the temperature while decreasing the pressure, the situation becomes more complex. The combined effect of the pressure decrease and temperature increase could lead to different outcomes for the final volume.

For example, if the pressure decrease is significant and the temperature increase is relatively small, the volume may still increase, resulting in O being larger than 2.96 L. On the other hand, if the pressure decrease is small and the temperature increase is significant, the volume may actually decrease, resulting in O being smaller than 2.96 L.

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Answer: 0.45 moles of \(H_2O\) will be produced from 0.15 moles of propanol.

Explanation:

The balanced chemical reaction is:

\(2C_3H_6O+8O_2\rightarrow 6CO_2+6H_2O\)

\(C_3H_6O\) is the limiting reagent as it limits the formation of product and \(O_2\) is the excess reagent.

According to stoichiometry :

2 moles of \(C_3H_6O\)produces = 6 moles of \(H_2O\)

Thus 0.15 moles of \(V\) will produce=\(\frac{6}{2}\times 0.15=0.45moles\)  of \(H_2O\)

Thus 0.45 moles of \(H_2O\) will be produced from 0.15 moles of propanol.

An atom's radius is well under 1 nanometer, or one billionth of a meter.

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The heat energy teaspoon of boiling water and a swimming pool full of room temperature water then swimming pool have more heat energy than the teaspoon of boiling water

Heat energy is the result of movement of tiny particles called as atom, molecule, or ion in solid liquid and gases and heat energy is the transfer from one object to the another and in Celsius scale water freezes at 0°C and boil at 100°C to 90°C however the swimming pool contains a lot more water therefore the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool that's why heat energy is more in the swimming pool then in teaspoon of boiling water

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The method used to separate a mixture of ethyl alcohol and water is distillation. Thus option (d) is true.

Distillation is defined as a process involving the conversion of liquid into vapor that is subsequently condensed back into liquid form.

It is a widely used method for separating the mixture based on difference in conditions required to change the phase of components.

Some of the types of distillation are:

Thus, the method used to separate a mixture of ethyl alcohol and water is distillation. Thus option (d) is true.

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Your question is incomplete, but most probably your complete question was

The apparatus in Image A above is used to separate a mixture of ethyl alcohol and water. The mixture is heated in the flask on the left and the ethyl alcohol drips into the flask on the right after condensing in the cooling tube in the middle. Which method was used to separate the mixture?

a. chromatography

b .filtration

c .sorting

d distillation

1.00 pint of milk is equal to 473.18 milliliters, based on the conversion factor of 1 pint = 473.18 milliliters.

To convert pints to milliliters, we can use the conversion factor of 1 pint = 473.18 milliliters.

Since we have 1.00 pints of milk, we can multiply it by the conversion factor to find the volume in milliliters:

1.00 pint * 473.18 milliliters/pint = 473.18 milliliters.

Therefore, 1.00 pint of milk is equivalent to 473.18 milliliters. It's important to note that this conversion factor is based on the standard definition of a pint, which is equal to 473.18 milliliters. In some countries, the pint may have a different value, so it's essential to use the appropriate conversion factor based on the specific context or region.

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A molecule is an electrically neutral group of atoms that act as a unit.

The smallest unit of an element or compound that still possesses all of its chemical characteristics is called a molecule. Atoms share electrons to create molecules. A molecule might include anywhere from two to thousands of atoms. Hydrogen is the smallest molecule and is made up of two hydrogen atoms. A protein, which can include millions of atoms, is the biggest molecule.

Chemical bonds keep molecules bound to one another. Ionic and covalent bonds are the two primary types of chemical bonds. When one atom gives an electron to another atom, an ionic bond is created. When two atoms share electrons, covalent bonds are created.

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Answer:

carbon dioxide

Explanation:

carbon dioxide is a compound

Based on the data provided for the two monoprotic acids, the molarity of the acid HA is 0.181 M.

Using the balanced chemical equation for the reaction between HA and NaOH, we can write :

HA + NaOH → NaA + H2O

We know that the number of moles of NaOH used in the titration is given by : n(NaOH) = M(NaOH) x V(NaOH)

where

M(NaOH) is the molarity of NaOH

V(NaOH) is the volume of NaOH used.

We know that the number of moles of NaOH used is equal to the number of moles of HA in the first flask.

Thus, n(HA) = n(NaOH)

We can calculate the number of moles of HA from the volume of NaOH used :

n(HA) = M(NaOH) x V(NaOH) = 0.0906 M x 0.0873 L = 0.00789 mol

Since the acid HA is monoprotic, the number of moles of HA is equal to the number of moles of H+ in the solution.

Thus, n(H+) = n(HA)

We can use the volume and concentration of the acid in the second flask to calculate the number of moles of H+ in the solution. The volume of the solution in the second flask is 50.0 mL, which is equal to 0.0500 L. The total volume of the HA and HB solutions in the second flask is 37.2 mL + (50.0 mL - 37.2 mL) = 12.8 mL.

Since HB is also monoprotic, the number of moles of H+ contributed by HB is equal to the number of moles of HB in the solution.

We can use the total volume and concentration of the solution in the second flask to calculate the number of moles of HB :

n(HB) = C(HB) x V(HB) = C(HB) x (12.8 mL/1000)

where C(HB) is the concentration of HB in the solution.

The concentration of the solution in the second flask is : n(H+)_total = n(HA) + n(HB)

= C(HA) x (43.5 mL/1000) + C(HB) x (12.8 mL/1000)

Since the acid HA is monoprotic, the number of moles of H+ contributed by HA is equal to the number of moles of HA in the solution.

We can use the total number of moles of H+ and HA in the solution to calculate the molarity of the acid HA :

C(HA) = n(HA) / (43.5 mL/1000) = n(H+)_total / (43.5 mL/1000)

Therefore,C(HA) = n(H+) / (43.5 mL/1000) = [0.00789 mol] / [43.5 mL/1000] = 0.181 M

Therefore, the molarity of the acid HA is 0.181 M.

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The wavelength of the light is approximately 500 nm. The energy of the photon of light is approximately 6.56 x 10-20 J.

Answer: Question 1:The formula relating wavelength, frequency, and the speed of light is given by:c = fλHere,λ = wavelength, f = frequency, c = speed of lightI. n the problem, frequency is given as 5.98 x 1014 s-1. Therefore, using the formula, the wavelength of light can be calculated as follows:λ = c/f= (3 x 108 m/s)/(5.98 x 1014 s-1)≈ 500 nm

Therefore, the wavelength of the light is approximately 500 nm.

Question 2:The formula relating energy and frequency of light is given by:E = hfwhereE = energy of photonh = Planck's constant = 6.626 x 10-34 J s (Joule seconds)f = frequency of lightIn the problem, the frequency of light is given as 9.89 x 1013 Hz. Therefore, using the formula, the energy of the photon of light can be calculated as follows:E = hf= (6.626 x 10-34 J s) x (9.89 x 1013 Hz)≈ 6.56 x 10-20 J

Therefore, the energy of the photon of light is approximately 6.56 x 10-20 J.

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The mass of \(Al_{2} S_{3}\) produced is 15.616 grams.

The reaction taking place is as follows:

\(2Al+ 3S\) →\(Al_{2} S_{3} (s)\)

Moles of Al = mass/molar mass = 10.0g/27.0g/mol

= 0.370 mol

Moles of S = mass/molar mass = 15.0g/(32.065g/mol)

= 0.468 mol

Al and S reacts in the molar ratio of 2:3.

2 moles of Al reacts with 3 moles of S

0.370 moles of Al will react with S = (3/2)*0.370mol

= 0.555 mol

Similarly, 0.468 moles of S will react with Al = 2/3 *0.468mol

= 0.312 mol

Thus, Al is in excess and S is the limiting reactant (some of Al will be left over ,S will completely react)

So, moles of \(Al_{2} S_{3}\) produced=1/3*0.312 mol of S

= 0.104 mol

Mass of \(Al_{2} S_{3}\) produced = moles*molar mass of \(Al_{2} S_{3}\)

= 0.104mol*150.158g/mol

= 15.616 grams

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Answer:: 1100 j

Explanation:

Solid aluminum has a specific heat capacity of 0.90 J/ gK joules of heat are absorbed to raise the temperature of 24.0 grams of aluminum from 300. K to 350. K is 11.080 J

Heat is the transfer of kinetic energy from one medium or object to another from an energy source to a medium or object

Here given data is

Specific heat capacity = 0.90 J/gK

Temperature = 300. K to 350. K = 350 - 300 = 50 K

Mass =  24.0 grams

We have to calculate the heat = ?

Q =mCΔT

Q =  24.0 grams× 0.90×50 K

Q = 11.080 J

11.080 J  heat are absorbed to raise the temperature

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Answer: (D) environmental chemistry

Explanation:

The environmental chemistry is branch of chemistry would study how pollution effects marine life. option D is correct.

Environmental chemistry is the study of the biochemical and chemical processes that occur in natural places like in forest, water bodies in air in soil and related to animals too.

Environmental chemistry is wide range of studies than air, water, soil, and chemicals. This also gives the brief account about the marine life with studying the life cycle of marine animals and plants too.

Therefore, environmental chemistry is branch of chemistry would study how pollution effects marine life. option D is correct.

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Answer: 0.0128 L soln.

Explanation:

Answer:

A. They cause heat to flow from the system to the surroundings.

Explanation:

Answer:

A. They cause heat to flow from the system to the surroundings.

Explanation:

a p e x , just took the quiz

Answer:

Mass of copper deposited = 31.75 g

Explanation:

According to Faraday's second law of electrolysis, when the same quantity of electricity is passed through different electrolytes, the relative number of moles of the elements deposited are inversely proportional to the charges on the ions of the elements.

From this law, it can be seen that the higher the charge, the lower the number of moles of a given element deposited.

Number of moles of aluminium in 9 g of aluminium = mass / molar mass

Molar mass of aluminium = 27 g

Number of moles of aluminium = 9/27 = 1/3 moles

Charge on aluminium ion = +3

3 moles of electrons will discharge 1 mole of aluminium,

1 mole of electrons will discharge 1/3 moles of aluminium

Number of moles of electrons involved = 1 mole of electrons

Charge on copper ion = +2

1 mole of electrons will discharge 1/2 moles of copper.

Mass of 1/2 moles of copper = number of moles × molar mass of copper

Molar mass of copper = 63.5 g

Mass of copper deposited = 1/2 × 63.5 = 31.75 g

Potassium Peramanganate .

The equation is followed as

\(\\ \ast\sf\hookrightarrow {K\atop Potassium}+{MnO_4\atop Manganeese\:Oxide}\longrightarrow {KMnO_4\atop Potassium\:Peramanganete}\)

Answer:

Electrons are shared in pairs!

Explanation:

I'm doing learning about  Covalent Bonding too:)