What is the pH of a buffer that contains 0.15 M CH3COOH and 0.10 M NaCH3COO (Ka = 1.8 × 10–5)?

Answer:

Cellular respiration is used to create usable energy from the foods that living things eat. It's important to know that the reactions involved in cellular respiration are catabolic, meaning they break down molecules into smaller ones. This differs from anabolic reactions, which build bigger molecules from smaller ones

Diatomic

consist of two atoms bonded together. In contrast, monatomic elements consist of single atoms (e.g., Ar, He). Many compounds are diatomic, such as HCl, NaCl, and KBr. Diatomic compounds consist of two different elements. There are seven pure elements that form diatomic molecules.

Key Takeaways: Diatomic Elements

Diatomic elements are pure elements that form molecules consisting of two atoms bonded together.

There are seven diatomic elements: hydrogen, nitrogen, oxygen, fluorine, chlorine, iodine, bromine.

These elements can exist in pure form in other arrangements. For example, oxygen can exist as the triatomic molecule, ozone.

This is a list of the seven diatomic elements. The seven diatomic elements are:

Hydrogen (H2)

Nitrogen (N2)

Oxygen (O2)

Fluorine (F2)

Chlorine (Cl2)

Iodine (I2)

Bromine (Br2)

All of these elements are nonmetals, since the halogens are a special type of nonmetallic element. Bromine is a liquid at room temperature, while the other elements all gases under ordinary conditions. As the temperature is lowered or pressure is increased, the other elements become diatomic liquids.

Astatine (atomic number 85, symbol At) and tennessine (atomic number 117, symbol Ts) are also in the halogen group and may form diatomic molecules. However, some scientists predict tennessine may behave more like a noble gas.

While only these seven elements routinely form diatomic molecules, other elements can form them. However, diatomic molecules formed by other elements are not very stable, so their bonds are easily broken.

compounds

are formed by the chemical combination of two or more element. example water is a compound because two elements water and hydrogen come to form it.

Answer: Sí

Explanation: ya que una mascota es inofensiva, pero para fotografiar a un animal salvaje, debes esperar pacientemente el momento perfecto

(a) Van der Waal's forces. Van der Waal's forces are weak electrostatic interactions between non-polar molecules.

These weak forces arise from the fluctuating dipoles within the molecules, which cause temporary charges to develop and attract each other. This attraction leads to the formation of weak intermolecular bonds, which are mainly responsible for the attraction between non-polar molecules. These forces are weak in comparison to other intermolecular forces, such as hydrogen bonding and ionic bonds, but are still important for the stability of non-polar molecules and their ability to dissolve in other non-polar solvents.Van der Waals forces are attractive intermolecular forces between molecules caused by the fluctuating dipole moments of molecules.

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complete question:The attraction that non-polar molecules have for each other is primarily caused by —

(a) Van der Waal's forces (b) Difference in electronegativities

(c) Hydrogen bonding (d) High ionisation energy​

Answer:

first choice

Explanation:

energy is written on the left side is its absorbed

2 elements came together so bonds are formed.

Answer:

\(T_f=25.0\°C\)

Explanation:

Hello.

In this case, considering that the sample of hot copper is submerged into the water and the container is isolated, the heat lost by the copper is gained by the water so we can write:

\(Q_{Cu}=-Q_w\)

In terms of mass, specific heat and temperature we write:

\(m_{Cu}C_{Cu}(T_f-T_{Cu})=-m_wC_w(T_f-T_w)\)

Whereas the final temperature is the same for both copper and water because they are in contact until thermal equilibrium is reached. In such a way, the required maximum temperature no more than the equilibrium temperature and is computed as shown below:

\(T_f=\frac{m_{Cu}C_{Cu}T_{Cu}+m_wC_wT_w}{m_{Cu}C_{Cu}+m_wC_w}\)

Thus, plugging the given data in the formula, we obtain:

\(T_f=\frac{10.3g*0.385\frac{J}{g\°C}*100\°C +47.0g*4.184\frac{J}{g\°C}*23.5\°C }{10.3g*0.385\frac{J}{g\°C}+47.0g*4.184\frac{J}{g\°C}}\\\\T_f=25.0\°C\)

Which is a small change considering the initial one, because the mass of water is greater than the mass of copper as well as for the specific heats.

Best regards!

The maximum temperature of the water in the insulated container after the copper metal is added is 25 °C

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

Mass of water (Mᵥᵥ) = 47 g

Temperature of water (Tᵥᵥ) = 23.5°C

Specific heat capacity of water (Cᵥᵥ) = 4.184 J/gºC

Mass of copper (M꜀) = 10.3 g

Temperature of copper (M꜀) = 100 °C

Specific heat capacity of copper (C꜀) = 0.385 J/gºC

The equilibrium temperature of the mixture can be obtained as follow:

Heat loss by copper = Heat gained by water

Q꜀ = Qᵥᵥ

M꜀C꜀(M꜀ – Tₑ) = MᵥᵥCᵥᵥ(Tₑ– Mᵥᵥ)

10.3 × 0.385 (100 – Tₑ) = 47 × 4.184 (Tₑ – 23.5)

3.9655 (100 – Tₑ) = 196.648 (Tₑ – 23.5)

Clear bracket

396.55 – 3.9655Tₑ = 196.648Tₑ – 4621.228

Collect like terms

396.55 + 4621.228 = 196.648Tₑ + 3.9655Tₑ

5017.778 = 200.6135Tₑ

Divide both side by 200.6135

Tₑ = 5017.778 / 200.613

Thus, the equilibrium temperature of the mixture is 25 °C. Therefore, the maximum temperature of the water in the insulated container is 25 °C

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Answer:The green skateboard experienced the strongest force because it changed speed the most.

Explanation:

The mass of iron (II) oxide that must be used to produce 10.6 g of iron would be 14.37 grams.

Iron is produced from iron (II) oxide by reacting with carbon monoxide according to the following equation:

\(Fe_2O_3 + 3CO -- > 2Fe + 3CO_2\)

The equation already obeys the law of conservation of atoms. Hence. it is a balanced equation.

The mole ratio of iron (III) oxide that reacts and the iron that is produced according to the equation is 1:2.

Now, in a particular reaction involving iron (III) oxide and carbon monoxide, 10.6 grams of iron were produced. The amount of iron (III) oxide used can be obtained using the mole ratio from the balanced equation of the reaction.

Recall that: mole = mass/molar mass

Molar weight of iron = 56 g/mol

Mole of 10.6 g of iron = 10.6/56

                                    = 0.19 moles

Since the mole ratio is 1:2, the equivalent mole of iron (III) oxide that reacts can be obtained:

                  0.19/2 = 0.09 moles

Molar mass of iron (III) oxide = 159.69 g/mol

Mass of 0.09 mol iron (III) oxide = 0.09 x 159.69

                                                    = 14.37 grams

Thus, the amount of iron (III) oxide that must be used to produce 10.6 g of iron would be 14.37 grams.

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Answer:

In 100 ways

Explanation:

The ratio of neutrons to protons, or the N/Z ratio, plays a crucial role in determining a nucleus' stability. The range of N/Z ratios in which nuclei are stable is generally referred to as the belt of stability.

If the forces between the constituents of the nucleus are equal, an atom is stable. If these forces are out of balance or if the nucleus has an excessive amount of internal energy, an atom is unstable (radioactive).

Z = 104 for Rutherfordium, element 104. The isotopes 261Rf and 262Rf, having masses of 261 and 262, respectively, have the longest half-lives. Accordingly, N/Z ratios are:

261Rf: N/Z = (261-104)/157 = 1.08

262Rf: N/Z = (262-104)/158 = 1.09

These N/Z ratios are a little bit higher than the average belt of stability values, which are about 1.0 for heavy nuclei. These isotopes are thought to be reasonably stable because they are close enough.

Z = 109 for Meitnerium, element 109. The isotopes 278Mt and 282Mt, with masses of 278 and 282, respectively, have the longest half-lives. Accordingly, N/Z ratios are:

278Mt: N/Z

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the mass of the H2CO3 produced = 0.351 g and the percentage yield of H2CO3 = 24.9% Solution:- 2NaHCO3 → Na2CO3 + H2CO3 since we know that no of moles = mass / molar mass molar mass…

The statement of "the mass of the H2CO3 produced is 1.31 g and the the percentage yield of H2CO3 is 96.43%."

The percentage yield is the percent ratio of actual yield to the theoretical yield. It is obtained by dividing the observed yield by the theoretical yield and multiplying by 100%.

Given:

2NaHCO3 → Na2CO3 + H2CO3

3.81 g of NaHCO3, 2.86 g of Na2CO3

Solution:

One mole of sodium carbonate and one mole of hydrogen carbonate are produced from two moles of sodium bicarbonate.

Gram to mole conversion,

\(3.81\;.\frac{1\;mole}{84\;g}\;=\;0.0453\;mol\;of\;NaHCO3\\2.86\;.\frac{1\;mole}{105.98\;g}\;=\;0.0269\;mol\;of\;Na2CO3\)

Initially to find the mass of H2CO3, moles of H2CO3 can be calculated by using the determined moles of NaHCO3.

\(0.0453\;mol\;NaHCO3.\frac{1\;mol\;H2CO3}{2\;mol\;NaHCO3}\;=\;0.0227\;mol\;H2CO3\)

So, the moles of hydrogen carbonate

\(0.0227\;mol\;H2CO3.\frac{62.03\;g\;H2CO3}{1\;mol\;H2CO3} = 1.408\;g\;H2CO3\)

Therefore the mass of the product is 1.408 g.

The actual yield of H2CO3 can be determined from mass of sodium bicarbonate and sodium carbonate.

Mass of H2CO3 = Mass of NaHCO3 - Mass of Na2CO3

Mass of H2CO3 = 3.81 g - 2.86 g

Mass of H2CO3 = 0.95 g

Now the percent yield,

% yield

\(= \frac{experimental\;yield}{theoretical\;yield}. 100\\= \frac{0.95\;g}{1.408\;g}. 100\)

= 67.47%

≈ 67.5%

Therefore, the percentage yield of the product is 67.5%.

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Answer:

Tetrahedral

Explanation:

The molecular geometry of SiCl₄ is a tetrahedral shape. According to the VESPR molecular theory, the compound has a shape of a tetrahedron.

The Voltage is the pressure from the electrical circuit of the power source that passes the current.

The Voltage is defined as the pressure from the electrical circuit of the power source that will passes the charged electrons that is the current through the conducting loop, it will enable them to do work  because of the illuminating the light. The in simple terms is : voltage = pressure, and it is denoted as the volts and the symbol is the V.

The voltage is described as the force that causes the flow of the charged particles. The Voltage is also called as the electromotive force.

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Answer:

The Answer is False.

Explanation:

Hope this helps!

At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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The correct answer is "decendent." Embalming authorization may be given by the bailee, next of kin, or spouse, but not by the decedent.

The term "decedent" refers to the person who has died; they are unable to give consent for embalming or any other post-mortem procedures. According to legal and cultural customs, the choice to embalm is often taken by the designated representative, such as the bailee (person in charge of the body), next of kin, or spouse.

Hence, embalming authorization may be given by the bailee, next of kin, or spouse, but not by the decedent.

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The concentration of the acid is \(0.25 M\).

Titration is a laboratory technique used to determine the concentration of a substance in a solution by reacting it with a standardized solution of known concentration.

The titration formula can be given by,

(Volume of the Base) \(\times\) (Normality of the Base) = (Volume of the Acid) \(\times\) (Normality of the Acid)

\(\Rightarrow V_1N_1=V_2N_2\)

Given, the volume of the base (\(NaOH\)), \(V_1 =25 ml\).

The concentration of the base (\(NaOH\)), \(M_1=0.5 M\).

The equivalence of the base (\(NaOH\)) is \(1\).

Hence, the normality of the base (\(NaOH\)), \(N_1=\frac{0.5}{1}N=0.5N\).

Given, the volume of the acid (\(HCl\)), \(V_2 =50 ml\).

Let us assume that the normality of the acid (\(HCl\)) \(N_2\).

Substitute the values in the given formula of titration.

\((25\times0.5)=(50 \times N_2)\\\Rightarrow 12.5=50N_2\\\Rightarrow N_2=\frac{12.5}{50} N\\\Rightarrow N_2=0.25 N\)

Hence, the normality of the acid (\(HCl\)), \(N_2=0.25 N\).

The equivalence of the acid (\(HCl\)) is \(1\).

Therefore, the concentration of the acid, \(M_1=\frac{0.25}{1}=0.25 M\).

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Answer:

\(\text{pH}=3.6\)

Explanation:

Given that,

\([H^+]=2.5\times 10^{-4}\ M\)

We need to find the pH of a solution with \([H^+]=2.5\times 10^{-4}\ M\).

We know that,

\(\text{pH}=-\text{log}[H^+]\\\\=-\text{log}[2.5\times 10^{-4}]\\\\=-(-3.6)\\\\=3.6\)

So, the pH of the solution is 3.6.

HAZWOPER training and certification recognize:

The correct option is both A and C

HAZWOPER (Hazardous Waste Operations and Emergency Response) training and certification recognize that a large number of victims (as much as 80%) in hazardous waste incidents or emergencies will self-present or be self-referred for medical treatment.

Additionally, HAZWOPER training acknowledges that victims may use any entrance they can access at a hospital, not just the emergency department entrance.

This is because individuals affected by hazardous materials may arrive at different areas of the hospital seeking medical assistance.

Therefore, option d. Both A and C are correct statements regarding the recognition of HAZWOPER training and certification.

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Answer:

Exothermic Reaction/ Combination Reaction

Explanation:

It is a combination reaction and the nature of the reaction is exothermic.  

Answer:

22.25 °C

Explanation:

Determine the final temperature when a 25.0 g piece of iron at 85.0 °C is placed into 75.0 grams of water at 20.0 °C.

Answer:

the entropy of this system is 4.9452  × 10⁻²³ J/K

Explanation:

Given the data in the question;

we take a look at the Boltzmann formula for entropy;

s = k × In( W )

k is the Boltzmann's constant ( 1.38 × 10⁻²³ m² kg s⁻² K⁻¹ )

W is the number of energetically equivalent possible microstates or system configurations ( 36 )

so we substitute

s = 1.38 × 10⁻²³  × In( 36 )

s = 1.38 × 10⁻²³ × 3.5835

s = 4.9452  × 10⁻²³ J/K

Therefore, the entropy of this system is 4.9452  × 10⁻²³ J/K

121.523 nm  is the wavelength (in nm) of the photon absorbed for a transition of an electron.

\(n_1=1 ,n_2=2\)

\(1/\lambda=1.09737 *10^7*1/1^2 *1/2^2=8230275m^-1\)

\(\lambda=1/8230275\)

1.215x10^-7 m=121.523 nm

since the dating between wave frequency and wavelength is inverse, gamma rays have extraordinarily tiny wavelengths that are best a small portion of the size of atoms, whereas different wavelengths can extend as a long way as the universe. No of the medium they are passing via, electromagnetic radiation's wavelengths are commonly expressed in phrases of the vacuum wavelength, but this isn't always said explicitly.

The wavelength of electromagnetic radiation influences how it behaves. speed of mild = wavelength x frequency power = Planck's consistent x frequency Wave wide variety = 1/wavelength in cm. The wavelengths of different elements of the electromagnetic spectrum are displayed collectively with a difficult approximation of the wavelength size.

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Answer:

i think it will be the first one

Explanation:

If 50 J of heat is added to an aluminum can with a mass of 21.3 g, 0.38°C  is its temperature change. Specific heat capacity of aluminum is 0.903 J/g∘C.

Heat is energy that is transmitted from one body to the other as a result of a temperature differential. When two bodies of differing temperatures come into contact, energy is transferred (i.e., heat flows) from the hotter to the colder.

A substance can absorb heat without increasing its temperature by transitioning from one physiological body to the another, for as from such a solid to a liquid, from either a liquid to a vapour, either from one stable state to another.

q=m×c×ΔT

substituting all the given values in the above equation, we get

50 =21.3 ×0.903 ×ΔT

ΔT =19.23/50 =0.38°C

Therefore, 0.38°C is the temperature change.

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Answer:

When sugar dissolves,these whole sucrose molecules separate from one another

Answer:

the answer woul be 89 if you do the math right

Explanation:

Answer: all of the water on the Earth

Explanation:

The hydrosphere is made up of all the water that we have on Earth. Included in the hydrosphere are the water that we have underground, those in the Earth's surface, and those that we have in the air.

On Earth, we can find water in the seas, lakes, oceans, streams, rivers etc. Water also comes in form of rain as well.