What is indicated by 'A' in the figure below?A. -EaB. +VEC. -VED. +Ea

Answer:

4NH3(g) + 3O2(g) → 2N2(g) + 6H2O(g)

Explanation:

It will take approximately 480 years for 99.2% of uranium-232 to decay.

The formula of radioactive half-life = \(\frac{N}{N₀} = (\frac{1}{2})^{n}\)

Where N = amount of isotope remaining

N₀ = original amount of isotope

n = number of half-lives

From the given values:

N = 100 5 - 99.2%

N = 0.8 % = 0.008

N₀ = 100% = 1

Substituting to find n

0.008/1 = (1/2)ⁿ

㏒₁₎₂0.008 = n

n = ㏒0.008/㏒(1/2)

n = 6.96

Therefore, number of half-lives n = 6.96

One half-life = 69 years

6.96 half-lives = 6.96 * 69 = 480.24 years

Therefore, it will take approximately 480 years for 99.2% of uranium-232 to decay.

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Answer:

see below

Explanation:

The lake will have more total thermal energy but the particles in the coffee will be moving faster.

A comparison of hot coffee and cold lake is, the heat from the coffee will be absorbed by the cold lake through convection method of heat transfer.

The principle of conservation of energy states that the total energy of an isolated system is always conserved.

Heat lost by the hot coffee = Heat absorbed by the cold lake

Heat from the coffee will be absorbed by the cold lake through convection method of heat transfer.

Thus, a comparison of hot coffee and cold lake is, the heat from the coffee will be absorbed by the cold lake through convection method of heat transfer.

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Answer:

B. Chlorine gas is yellow-green in color.

Answer:

3.51 x 10²¹ molecules H₂O

Explanation:

To find the amount of molecules in the sample, you need to multiply the amount of moles by Avogadro's Number. Avogadro's Number is a ratio comparing the amount of molecules per every 1 mole. It is important to arrange the ratio in a way that allows for the cancellation of units (moles should be in the denominator). The final answer should have 3 sig figs like the given value (0.00583 = 3 sig figs).

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

0.00583 moles H₂O           6.022 x 10²³ molecules
--------------------------------  x  --------------------------------------  =  3.51 x 10²¹ molecules
                                                          1 mole
                                           

Neutrons and protons, commonly called nucleons, are bound together in the dense inner core of an atom, the nucleus, where they account for 99.9 percent of the atom's mass. ... The neutron was discovered in 1932 by the English physicist James Chadwick.

Hope this helps : )

Answer:

The carbon fiber itself will withstand incredibly high temps. The weak point will be the epoxies or the resins.Ambient-cured epoxies will typically begin breaking down around 100 °C. The heat-cured epoxies that will go up to around 300 °C. As you get into the high temp ratings, the epoxies get trickier to handle, install, cure.Since the compositions of most irons while casting are around the eutectic point (lowest liquid point) of the iron–carbon system, the melting temperatures usually range from 1,150 to 1,200 °C.As is evident, at such high temperatures, the epoxies of Carbon Fibers will melt. So, they are not yet used for iron casting.

Ranking the given gases at 1.00 atm and 298k, from most dense to least dense;

                 \(N_{2}O > O_{2} > HF > CH_{4}\)

Density:

We use the word "density" to indicate how much space (or "volume") an object or substance occupies in relation to the amount of matter contained therein (it's mass). Density can also be defined as the quantity of mass per unit of volume. A dense object is one that is both hefty and small.

Mathematically,

                       D = M/V

Where,

          D is density,

          M is mass and

          V is volume.

Given,

         Pressure = 1 atm

         Temperature = 298 K

We know that from the Universal gas equation,

                      PV = nRT

                         V = nRT/P

                         V = constant

∴ The density of the gases

                         D ∝ M

We know that,

                        \(M_{N_{2}O }= 44.013 g/mol\)

                        \(M_{O_{2} }=32g/mol\)

                       \(M_{HF}=20.01g/mol\)   and

                      \(M_{CH_{4} }= 16.04g/mol\)

Hence,

           Ranking the given gases at 1.00 atm and 298k, from most dense to least dense;

                       \(N_{2}O > O_{2} > HF > CH_{4}\)

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The Microscope part and their right descriptions are as follows

Iris Diaphragm: A. Increases or decreases the light intensity

Objective Lens System: B. After light passes through the specimen, it next enters this lens system

Stage: C. Platform that supports a microscope slide

Adjustment Knob: D. Causes stage (or objective lens) to move upward or downward

Condenser: E. Concentrates light onto the specimen

Other parts of a microscope and their description that you should know about includes;

Eyepiece - The lens that you look through to see the image of the specimen.

Body tube - The tube that connects the eyepiece to the objective lenses.

Arm - The part of the microscope that supports the body tube and connects it to the base.

Base - The part of the microscope that supports the arm and provides stability.

Illuminator - The light source that provides light for the microscope.

Stage clips - The clips that hold the microscope slide in place on the stage.

Revolving nosepiece - The part of the microscope that holds the objective lenses and allows them to be rotated into place.

The above answer is in response to the full question below;

Match the names of the microscope parts in column A with the descriptions in column B. Place the letter of your choice in the space provided.

1. Iris diaphram

2. Objective lens system

3. Stage

4. Adjustment knob

5. Condenser

Increases or decreases the light intensity

2. After light passes through the specimen, it next enters this lens system

3. Platform that supports a microscope slide

4. Causes stage (or objective lens) to move upward or downward

5. Concentrates light onto the specimen

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A solution with nitrate(V) ion concentrations over 0.05 mg/cm3 has a molarity of around 1.61 x 10-5 mol/L.

We must first convert the amount of nitrate(V) ions in drinking water to moles per litre since the threshold concentration over which "Blue-Baby" Syndrome might manifest is 0.05 mg/cm3.

It is necessary to know the molar mass of nitrate(V) ions in order to convert from mg/cm3 to moles per litre (NO3-).

The formula below can be used to determine NO3-'s molar mass:

N: 14.01 g/mol for the atomic mass

O: 16.00 g/mol is the atomic mass (3 oxygen atoms in NO3-)

NO3-'s total molar mass is equal to 14.01 + 16.00 x 3 = 62.01 g/mol.

Let's now translate the specified concentration from mg/cm3 to moles/liter (M).

As 1 g = 1000 mg, 1 mg/cm3 is 0.001 g/cm3.

1 cm3 = 0.001 g/mL multiplied by 0.001 g/cm3

1 L/1000 mL x 0.001 g/mL = 0.001 g/L

We must change the grams into moles using the molar mass in order to get the molarity:

1.61 × 10-5 mol/L = 0.001 g/L / 62.01 g/mol

As a result, a solution with nitrate(V) ion concentrations over 0.05 mg/cm3 has a molarity of around 1.61 x 10-5 mol/L.

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HCl reacts with NaHCO₃ this way:

The equation is already balanced, it means that 1 mole of HCl reacts with 1 mole of NaHCO₃.

Convert the mass of NaHCO₃ to moles using the molecular mass of NaHCO₃ which is 84g/mol.

Now, use the ration stated before to find how many moles of HCl react with this amount of NaHCO₃:

It means that 0.0056 moles of HCl are needed to react with 0.47g of NaHCO₃.

Answer:

28645 years

Explanation:

Given the formula;

0.693/t1/2 = 2.303/t log (No/N)

Given that N = 1/32 No

Note;

t1/2 = half life of Carbon-14

t = time required for N amount of carbon -14 to remain= 5,730 years

No= amount of carbon 14 initially present

N = amount of carbon-14 after time t

Substituting values;

0.693/5,730 = 2.303/t log (No/1/32No)

0.693/5,730 = 2.303/t log 32

1.21 * 10^-4      = 3.466/t

t = 3.466/1.21 * 10^-4

t = 28645 years

Any preserved imprints, remains and traces of once a living organism from history are called fossils. By utilizing the radioactive property of organic compounds one can determine the age of an object.

The approximate age of the fossilizes remain is 28645 years.

This can be estimated as:

The formula used will be:

\(\dfrac{0.693}{\dfrac{t1}{2}}= \dfrac{2.303}{t} log (\dfrac{No}{N})\)

Where,

Given,

N = \({\dfrac{1}{32} No\)

Replacing values in formula:

\(\dfrac{0.693}{5,730} & = \dfrac{2.30}{t} log \:({{\dfrac{No}{\dfrac{1}{32} No}})\)

\(\dfrac{0.693}{5,730} & = \dfrac{2.30}{t} \;log 32\)

\(1.21 \times 10^{-4} = \dfrac{3.466}{t}\)

\(t = \dfrac{3.466}{1.21} \times 10^{-4}\)

\(t = 28645 \:\text{years}\)

Therefore, the approximate age of the fossil is 28645 years.

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The half-life of a reaction is the time it takes for the concentration of a reactant to decrease to half its initial value. In a first-order reaction, the rate of the reaction is directly proportional to the concentration of the reactant. This means that the rate of the reaction depends on the concentration of compound A.

To calculate the half-life of compound A, you can use the equation:

half-life = (ln(2)) / k

where k is the rate constant for the reaction.

Plugging in the values given in the question, we get:

half-life = (ln(2)) / 0.45

This simplifies to:

half-life = 1.44 / 0.45

Which gives us a final result of:

half-life = 3.2 hours

So the half-life of compound A at 250°C is approximately 3.2 hours.

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Answer: 0.133 mol/l

Explanation: molality = concentration = 0.400 mol/3.0 l

The activity of the sample when it was shipped from the manufacturer is 4.54 mCi

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

n = t / t½

n = 48 / 342.72

n = 0.14

N = N₀ / 2ⁿ

N = 5 / 2^0.14

N = 4.54 mCi

Thus, the activity of the sample during shipping is 4.54 mCi

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1. The molarity of the solution is 7.78 M. 2. There are 0.109 moles of sodium nitrate in 0.33 L of a 0.33 M solution.

2. We are given 3.5 moles of potassium nitrate in 450 mL of solution. To find molarity, we need to convert mL to L:

450 mL = 0.45 L

Then we can use formula:

Molarity = moles of solute/liters of solution

Molarity = 3.5 moles / 0.45 L= 7.78 M

2. We are given volume of 0.33 L and a molarity of 0.33 M for sodium nitrate. To find the number of moles of sodium nitrate, using:

moles of solute = molarity x liters of solution

moles of solute = 0.33 M x 0.33 L  = 0.109 moles

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--The complete Question is 1. What is the molarity of a 450 mL solution containing 3.5 moles of potassium nitrate?

2. How many moles of sodium nitrate are in 0.33 L of a 0.33 M solution? --

Answer:

C.

Explanation:

I search it on Gøogle

The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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2. The pH is 4.22 × 10⁸. 3. pH is 7, 4. pOH is 9.7, 5. diprotic is explained below, 6. Amphoteric is explained below, 7. pH meter, 8. A buffer solution is explained below, 9. Titration is explained below, 10. Difference between strong and weak acids is explained below.

2. pH = -log[H⁺]

pH = -log(4.22 x 10⁻⁸)

pH ≈ 7.375

3. pH + pOH = 14

pH + 7 = 14

pH = 14 - 7

pH = 7

4. pH + pOH = 14

pOH = 14 - pH

pOH = 14 - 4.3

pOH ≈ 9.7

Now,

[H⁺] × [OH⁻] = 1.0 x 10⁻¹⁴

[OH⁻] = 1.0 x 10⁻¹⁴ / [H⁺]

[OH⁻] = 1.0 x 10¹⁴ / 10^(-pOH)

[OH⁻] = 1.0 x 10⁻¹⁴ / 10^(-9.7)

[OH⁻] ≈ 1.99 x 10⁻⁶ M

5. Being diprotic means that a molecule or ion can donate or release two protons (H⁺ ions) in an acid-base reaction.

6. Amphoteric refers to a substance that can act as both an acid and a base.

7. The pH can be measured using a pH meter or a pH indicator.

8. A buffer solution is a solution that can resist changes in pH when small amounts of acid or base are added to it.

9. Titration is a laboratory technique used to determine the concentration of a solution by reacting it with a solution of known concentration (titrant) of another substance.

10. A strong acid is an acid that completely ionizes in water, releasing all of its hydrogen ions. A weak acid is an acid that does not completely dissociate into ions when dissolved in water.

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The correct answer based on relative electronegativity would be:

Br > P > C > Mg

What is Electronegativity?

Electronegativity is a measure of an element's tendency to attract a bonding pair of electrons towards itself when it forms a chemical bond with another element. It is a property of elements that reflects their ability to attract and hold onto electrons in a chemical bond.

Electronegativity is a measure of an element's tendency to attract a bonding pair of electrons. In general, electronegativity increases from left to right across a period in the periodic table and decreases from top to bottom within a group. Therefore, Bromine (Br) would have the highest electronegativity among the given options, followed by Phosphorus (P), Carbon (C), and Magnesium (Mg) with the lowest electronegativity.

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Choosing a biome for a research project can provide a wealth of opportunities to better understand the natural world and contribute to important conservation and management efforts.

There are several convincing reasons for researchers to choose a particular biome for their project, some of which include:

Biodiversity: Biomes are characterized by their unique plant and animal species, which can provide a diverse range of research opportunities, including studying their adaptations, behaviors, and interactions.

Climate Change: Biomes are also influenced by climate change, making them an important area of research to better understand how these ecosystems are being affected by changes in temperature and precipitation patterns.

Human Impacts: Human activities, such as deforestation, agriculture, and urbanization, can have a significant impact on biomes. Studying these impacts can help researchers better understand how to mitigate and manage these effects.

Biogeochemical Cycles: Biomes are also important for studying biogeochemical cycles, such as the carbon and nitrogen cycles, which are essential for sustaining life on Earth.

Conservation: Finally, studying biomes can also contribute to conservation efforts, helping to preserve these unique ecosystems and the species that inhabit them.

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Answer:

B

Explanation:

If the frequency is doubled, the wavelength is only half as long.

If the wavelength Doubled, the frequency is reduced.

Answer:

Explanation:

To calculate the molar internal energy of a gas at a given temperature, you need to know the molar specific heat capacities at constant volume and constant pressure for the gas. These values are typically provided in tables of thermodynamic data, which can be found in various sources such as textbooks or online. Since you mentioned that you want to take the translational and rotational degrees of freedom into consideration, you will need to use the molar specific heat capacity at constant volume, which accounts for these degrees of freedom.

Once you have the molar specific heat capacity at constant volume for the gas, you can use the equation U = Cv * T, where U is the molar internal energy, Cv is the molar specific heat capacity at constant volume, and T is the temperature in kelvins. In your case, the temperature is 298.15 K, so plugging in the appropriate values and solving for U will give you the molar internal energy of carbon dioxide at that temperature.

It's important to note that the molar specific heat capacity at constant volume is typically a function of temperature, so you will need to use the appropriate value for the temperature you are interested in. Additionally, different sources may provide slightly different values for the molar specific heat capacity, so it's always a good idea to consult multiple sources to get a sense of the range of possible values.

An electron has a negative charge.

The charge of an electron is a fundamental property of the particle, and it is denoted by the symbol "e." The magnitude of the charge of an electron is approximately 1.602 × 10^-19 coulombs (C). This value is considered the elementary charge and is used as a reference for other charges. The charge of an electron plays a significant role in determining the behavior and interactions of atoms and molecules. It is opposite in sign to the charge of a proton, which is positive. The electron's charge allows it to interact with other charged particles, such as protons and ions, through electrostatic forces. Electrons are subatomic particles that orbit the nucleus of an atom in specific energy levels or orbitals. They contribute to the overall stability and chemical properties of atoms and participate in chemical bonding and reactions. The movement of electrons between atoms is what enables the formation of chemical bonds and the sharing or transfer of electrons to create ions. In summary, the charge of an electron is negative, and it plays a fundamental role in the structure and behavior of atoms and molecules.

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The mechanism of  the reaction of an alkene with an electrophile attached below

There's 2 steps in reaction between alkene and electrophile

The K in the KI electrophile is attacked by the two pi electrons from the double bond during the first step of the process, which is denoted by a curved arrow. The hydrogen from HBr and a carbon from the double bond combine to produce a C-H sigma bond thanks to the two pi electrons. In order to create a halide anion, the electrons from the H-X bond simultaneously transfer to the halogen. One of the carbons becomes an intermediate carbocation with an electron deficit when pi electrons from the double bond are removed. The positive charge is housed in an unhybridized p orbital on this sp2 hybridized carbon atom.

In order to receive an electron pair from the nucleophilic halide anion, the generated carbocation can now function as an electrophile. The neutral alkyl halide is the end result of electrophilic addition, and the electron pair transforms into an X-C sigma bond.

The HBr, HCl, HI, and HF halides can all take part in this reaction and add on in the same way. Although various halides do react at varying rates, this is because the H-X bond weakens with increasing X due to inadequate orbital overlap.

Your question is incomplete but most probably your full question attached below

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9. The number of mole of the argon contained in the tank is 2.39 moles

10. The volume (in liters) of H₂O produced from the reaction is 73.5 liters

The number of mole of the argon contained in the tank can be obtained as follow:

PV = nRT

Inputting the given parameters, we have:

9.4 × 6.25 = n × 0.0821 × 299

Divide both sides by (0.0821 × 299)

n = (9.4 × 6.25) / (0.0821 × 299)

n = 2.39 moles

Thus, the number of mole of the argon gas in the tank is 2.39 moles

The volume of H₂O produced can be obtained as shown below:

4NH₃(g) + 5O₂(g) -> 6H₂O(g) + 4NO(g)

From the balanced equation above,

4 liters of NH₃ reacted to produced 6 liters of H₂O

Therefore,

49 liters of NH₃ will react to produce = (49 × 6) / 4 = 73.5 liters of H₂O

Thus, the volume of H₂O produced is 73.5 liters

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Explanation:

The freezing point depression is a colligative property. We have to find the mass of ethylene glycol that we have to add to 100.0 g of water to change its freezing point from 0.0 °C to -4.3 °C.

The freezing point depression for a solution can be calculated using the following equation:

ΔTf = kf * molality * i

Where ΔTf is the freezing point depression, kf is the freezing point depression constant (it depends on the solvent and for water is 1.86 °C/m), molality is the molality of the solution and i is the Van't Hoff factor.

The Van't Hoff factor represents the number of particles formed when that compound dissolves. In our case the solute is ethylene glycol, a covalent compound, so it won't form ions when dissolved in the water. Then i is equal to 1.

The temperature must change from 0.0 °C to -4.3 °C, then the freezing point depression is 4.3 °C. So we know that:

i = 1 kf = 1.86 °C/m ΔTf = 4.3 °C

We can replace those values in the formula and find the molality of the solution.

ΔTf = kf * molality * i

4.3 °C = 1.86 °C/m * molality * 1

molality = 4.3 °C/(1.86 °C/m)

molality = 2.31 m

Now we can get the moles of ethylene glycol from the definition of the molal concentration. Molality are the moles of solute per kg of solvent. The mass of water is 100 g.

mass of solvent = 100.0 g * 1 kg/(1000 g)

mass of solvent = 0.100 kg

molality = moles of solute/(mass of solvent in kg)

moles of solute = molality * mass of solvent in kg

moles of solute = 2.31 m * 0.100 kg

moles of solute = 0.231 moles

And finally we can convert the moles of ethylene glycol to grams using its molar mass.

molar mass of C₂H₆O₂ = 62.07 g/mol

mass of C₂H₆O₂ = 0.231 moles * 62.07 g/mol

mass of C₂H₆O₂ = 14.4 g

Answer: 14.4 g of ethylene glycol must be mixed.

Answer:

E

Explanation:

Anything going down Column 1 is going to be more reactive than anything else.

So the only contenders that are in column 1  are Li and Cs. The most reactive ones are the ones going down.

Cs is at the bottom of column 1. The answer is E

Answer:

hope this helps

Explanation:

72

The catalyst for the reaction is I2 and the step which is slower is second step

The rate law expression shows that the rate of the reaction is directly proportional to the concentration of I2. This indicates that I2 is involved in the rate-determining step of the reaction, which is likely the slowest step in the overall reaction.

From the mechanism given, we can see that the first step involves the reaction between CH3CHO and I2 to form CH3I, HI, and CO. The second step involves the reaction between CH3I and HI to form CH4 and I2. The rate of the overall reaction will be limited by the slower of these two steps.

To determine the slower step, we need to look at the reaction intermediates in each step. In the first step, the intermediate HI is a radical, which is highly reactive and likely to react quickly with other species present in the reaction mixture. In contrast, in the second step, the intermediate CH3I is relatively stable and less likely to react quickly with other species.

Therefore, the slower step is likely the second step, which involves the reaction between CH3I and HI to form CH4 and I2. This step is likely rate-determining and determines the overall rate of the reaction.

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the complete question is :

At 800 K, the rate of decomposition of aldehyde (CH3CHO) into CCH and CO follows the rate law: r=K[CCH3CHO][I2]. The decomposition is thought to follow a two-step mechanism:

CH3CHO+I2→CH3I+HI+CHOCH3I+HI→CH4+I2

What is the reaction's catalyst? Which of the two steps is the more difficult?