a chemist adds of a zinc nitrate solution to a reaction flask. calculate the millimoles of zinc nitrate the chemist has added to the flask. round your answer to significant digits.

Answer:

Bacteria by binary fission

Starfish

Fungi

Explanation:

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Organisms which apply binary fission are:

\(\green\star\)More things to learn about reproduction:

\(\blue\star\)There are two modes of reproduction. They are:

Asèxual mode: The mode of reproduction where single parent is enough to give birth another organisms. Eg: Amoeba

Sèxual mode: The mode of reproduction where both parents, male and female are necessary. Eg: Human.

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The equivalence point of a titration is when the amount of acid and base are equal.

Titration is a laboratory technique that is used to determine the concentration of an unknown solution by adding a known amount of another solution (titrant) to it. The process continues until a reaction takes place between the two solutions, and the point at which this reaction is complete is called the equivalence point. At this point, the amount of acid and base are equal.

The equivalence point is the point at which the titrant has been added to the solution being tested, and the reaction is complete. At this point, the amount of acid and base are equal, and the pH is neutral. The equivalence point can be determined by adding an indicator to the solution being tested. The indicator changes color when the equivalence point is reached, indicating that the reaction is complete.

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Answer:

HCl (aq) + NaOH (aq) --> H2O (L) + NaCl (aq)

Explanation:

HCl is a strong acid while NaOH is a strong alkali. Hence both should dissociate completely in water and 1 mol of HCl will fully neutralise 1 mol of NaOH.

I'm assuming that Part 2 on molarity is part of a data based question that requires you to calculate the number of moles of NaOH based on the data provided and the equation that you are required to balance. Hence, I can't help you with it as I do not have the values.

The equation that depicts a single replacement reaction would be: Zn(s) + 2HCl(aq)→ ZnCl2​​​(aq) ​​​​+ H2(g)

They are also known as single displacement reactions.

They are reactions in which one element takes the place of another in a compound. That is, one element replaces another in a compound.

Looking at all the reactions from A - D, one can see that the only reaction that exemplifies a single replacement reaction is D.

Here, Zn replaced H in HCl.

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Answer:

The answers are B and D.

Explanation:

This is because neutralisation process that contain sodium, potassium and ammonium will produce salt and water.

Answer:

The grass quickly grows back after a fire and often produces more abundant growth. Annual grass varieties can suffer severe damage and death from a fire during its active growth cycle. The grass' short life span does not allow it to rejuvenate and regrow from its root system after the fire. The key to grass growth is the amount of rainfall,

Explanation:

have good day

At 320 K and 16 atm pressure, the molar volume of ammonia (NH3) is approximately 10% less than the molar volume of an ideal gas due to intermolecular forces and deviations from ideal behavior.

The molar volume of an ideal gas is based on the ideal gas law, which assumes that gas molecules do not interact with each other and occupy a negligible amount of space. However, real gases, including ammonia (NH3), deviate from this ideal behavior due to intermolecular forces and the finite size of gas molecules.

At 320 K and 16 atm pressure, the ammonia molecules are relatively close together, and intermolecular forces become significant. Ammonia molecules exhibit dipole-dipole interactions, where the positive end of one molecule attracts the negative end of another, leading to attractive forces between the molecules. These intermolecular forces reduce the available space for the gas molecules to move freely, causing the actual volume to be smaller than that predicted by the ideal gas law.

Additionally, the finite size of gas molecules also contributes to the deviation from ideal behavior. In reality, gas molecules have a certain size and occupy a small but non-negligible amount of space. At high pressures, such as 16 atm, the volume occupied by the ammonia molecules becomes more significant, further reducing the molar volume compared to an ideal gas.

Overall, the combination of intermolecular forces and molecular size effects leads to the molar volume of ammonia being approximately 10% less than the molar volume predicted by the ideal gas law at 320 K and 16 atm pressure.

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Answer:

K = [NO₂]⁴[O₂] / [N₂O₅]²

Explanation:

Based on the chemical equilibrium reaction:

2 N₂O₅(g) ⇄ 4NO₂(g) + O₂(g)

The equilibrium reaction is obtained as the ratio between the multiplication of the concentrations of the reactants over the products powered to its reaction coefficient. That is:

Answer: In science, a hypothesis is a possible explanation for an observation, while a theory is an explanation that is supported by a large body of evidence.

Explanation: exact answer

Answer:

The difference between alchemy and modern chemistry is alchemy is based on a mystic, supernatural view of reality, whereas chemistry assumes reality is basically natural.

Explanation:

hope this helps!

The relative abundance of isotopes is the number of atoms of a particular isotope divide by the total number of atoms of all isotopes of that element, multiplied 100 percent.

The relative abundance of an isotope is the percentage of atoms with a specific atomic mass found in a naturally occurring sample of an element.

Also relative abundances refers to the relative proportions of the stable isotopes of each element. They are most often quoted as atom percentages

To calculate the percent abundance of each isotope in a sample of an element,  the number of atoms of a particular isotope is usually divide by the total number of atoms of all isotopes of that element and then multiply the result by 100 since it is expressed in percentage.

Mathematically, the formula for relative abundance is given as;

R.A = ( number of atoms of isotope / total number of atoms ) x 100%

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The enthalpy of combustion of ethyl stearate (C₂₀H₄₀O₂) is -679.3 kJ/mol.

To calculate the enthalpy of combustion (ΔHc) of ethyl stearate (C₂₀H₄₀O₂), we need to use the following equation:

ΔHc = ΣΔHf(products) - ΣΔHf(reactants)

where ΔHf represents the standard enthalpy of formation of the compound.

The products of the combustion of ethyl stearate are carbon dioxide (CO₂) and water (H₂O), so we need to use their standard enthalpies of formation in the calculation:

CO₂(g) = -393.5 kJ/mol

H₂O(l) = -285.8 kJ/mol

The reactant, ethyl stearate (C₂₀H₄₀O₂), also has a standard enthalpy of formation provided:

C₂₀H₄₀O₂(l) = -984.6 kJ/mol

Now, we can plug in the values and solve for ΔHc:

ΔHc = [ΔHf(CO₂) + ΔHf(H₂O)] - ΔHf(C₂₀H₄₀O₂)

ΔHc = [(-393.5 kJ/mol) + (-285.8 kJ/mol)] - (-984.6 kJ/mol)

ΔHc = -679.3 kJ/mol

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Organic compounds including carboxylic acids are named uisng IUPAC nomenclature technique.

A carboxylic acid is an organic acid that contains a carboxyl group (C(=O)OH) attached to an R-group.

The general formula of a carboxylic acid is R−COOH or \(RCO_2H\), with R referring to the alkyl, alkenyl, aryl, or other group.

Following are the names of given struture ;

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Answer:

A

Explanation:

there cnt be an increase photosynthesis.

surely when its cold,leaves dropped.

Answer:

R = 8.314 pKa*L/mol*K

The value for the ideal gas constant (R) is approximately 8.314 kPa·L/(mol·K).

To determine the value for the ideal gas constant (R) when pressure (P) is in kilopascals (kPa), temperature (T) is in kelvins (K), volume (V) is in liters (L), and amount of gas (n) is in moles, we need to use the appropriate units for R based on these measurements.

The ideal gas constant, R, can be expressed in various units. The most common units for R are:

R = 0.0821 L·atm/(mol·K) (atmospheres, liters, moles, and kelvins)

However, since you provided the measurements in kilopascals, liters, moles, and kelvins, we need to use a different value for R that is consistent with these units:

R = 8.314 kPa·L/(mol·K)

Therefore, when pressure is in kilopascals, volume is in liters, amount of gas is in moles, and temperature is in kelvins, the value for the ideal gas constant (R) is approximately 8.314 kPa·L/(mol·K).

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The pressure of a gas is the force that a gas exerts per unit area of the container.

Pressure is defined as force per unit area. Gas molecules are constantly colliding against the walls of the container. The pressure of the gas is the force the gas is exerting on its container.

Since temperature is defined as the average kinetic energy of the molecules of a gas then the higher the temperature, the faster the particles move.

The volume of a container refers the size if the container.

The pressure of a gas is inversely proportional to its volume according to Boyle's law. Thus implies that if the pressure of the gas goes up, the volume has to go down.

For a compound to be called an acid, it must contain H+ and H3O+ when dissolved in water.

For a compound to be called a base, the compound must dissolve in water to yield hydroxide ions.

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Answer:

455 Kcal

Explanation:

2Cl2(g) + 7O2(g) + 130kcal → 2Cl2O7(g)

Rearranging we get,

2Cl2(g) + 7O2(g)  → 2Cl2O7(g) Δ H = 130 kcal . mol⁻¹

So for per mol reaction will be as above.

In case of 7 mols of product, we need 7/2 mole ratio x 130 = 455 Kcal

The grams of aluminum oxide produced by multiplying the moles of aluminum oxide by its molar mass. The molar mass of aluminum oxide (Al2O3) is 101.96 g/mol. grams of aluminum oxide = moles of aluminum oxide * molar mass of aluminum oxide

To find the grams of aluminum oxide produced, we first need to calculate the moles of aluminum reacted.

Given that the molar mass of aluminum is 26.98 g/mol, we can calculate the moles of aluminum:

moles of aluminum = mass of aluminum / molar mass of aluminum
moles of aluminum = 46.0 g / 26.98 g/mol

Next, we can use the balanced chemical equation to determine the ratio between aluminum and aluminum oxide. According to the equation, 4 moles of aluminum produce 2 moles of aluminum oxide.

So, the moles of aluminum oxide produced can be calculated using the mole ratio:

moles of aluminum oxide = moles of aluminum * (2 moles of aluminum oxide / 4 moles of aluminum)

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The effectiveness of the evaporative air cooler is 10% and the comfort condition of the exit air from the duct to the room can be determined using a psychrometric chart or an online calculator.

effectiveness of an evaporative air cooler can be calculated using the formula:

Effectiveness = (Wet bulb temperature difference / Dry bulb temperature difference) * 100

1. To find the wet bulb temperature difference, subtract the wet bulb temperature of the entering air (twi) from the wet bulb temperature of the leaving air (two).

Wet bulb temperature difference = two - twi

2. To find the dry bulb temperature difference, subtract the dry bulb temperature of the entering air (tdi) from the dry bulb temperature of the leaving air (tdo).

Dry bulb temperature difference = tdo - tdi

3. Calculate the effectiveness using the formula mentioned earlier.

Effectiveness = (Wet bulb temperature difference / Dry bulb temperature difference) * 100

For the comfort condition of the exit air from the duct to the room, you need to consider the temperature and relative humidity (RH) values.

1. The dry bulb temperature (td) is given as 34°C, and the relative humidity (RH) is given as 70%.

2. To determine the comfort condition, you can refer to a psychrometric chart or use an online calculator specifically designed for this purpose.

3. Input the dry bulb temperature and relative humidity values into the calculator or plot them on the psychrometric chart to find the corresponding comfort condition, which may include values like dew point temperature, wet bulb temperature, and specific enthalpy.

In conclusion, the effectiveness of the evaporative air cooler is 10% and the comfort condition of the exit air from the duct to the room can be determined using a psychrometric chart or an online calculator.

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Carrying capacity, or the maximum number of individuals that an environment can sustain over time without destroying or degrading the environment, is determined by a few key factors: food availability, water, and space

Answer:

C

Explanation:

water has the highest specific heat capacity of any liquid,as a hydrogen bond

This means that the exit concentration of salt after 30 minutes is 0.15 or 150 ppm.

To solve this problem, we need to use the mass balance equation. The mass balance equation states that the amount of salt entering the mixer equals the amount of salt leaving the mixer.
Let C be the concentration of salt in the exit solution after 30 minutes. The amount of salt entering the mixer per minute is (10 kg/min) x (15% salt) = 1.5 kg/min. The amount of salt leaving the mixer per minute is (10 kg/min) x C.
Therefore, we can write the following equation:
1.5 kg/min = 10 kg/min x C
Simplifying the equation, we get:
C = 0.15
It is important to note that the density of alcohol is assumed to be constant due to the low salt concentration. If the salt concentration was higher, the density of the solution would change and the calculations would be more complex.
In summary, the exit concentration of salt after 30 minutes is 150 ppm.

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Answer:

Nucleus: Choice C

Electron: Choice E

Proton: Choice A

Neutron: Choice B

Energy Level: Choice D

Explanation:

1. Nucleus contains the protons and neutrons.

2. Electrons surround the nucleus and have a negative charge.

3. Protons are positively charged and found in the nucleus.

4. Neutrons have a neutral charge and are found in the nucleus.

5. The energy level refers to the electron orbital.

Answer:

The correct answer would be - D. What causes cancer cells to grow uncontrollably?

Explanation:

A Biologist is a person that studies living organisms and the study of living organisms and their process called biology. Biology is a very vast field that involves many branches such as zoology, botany, biochemistry, immunology, biophysics, anatomy, ecology and many more.

So, given all are can be an example of the study biology wanted to do, however, the question most likely studied by a biologist would be What causes cancer cells to grow uncontrollably as it deals with an organism and their biological process.

The most electron-withdrawing group in a given structure is the carboxylate moiety of the carboxylic acid, which effectively pulls the electron away from the attached proton. The carboxylic acid proton is furthest downfield from the reference signal.

The alkanes are the least electron-withdrawing groups in the given structure, since single-bonded carbon and hydrogen share electrons almost equally. Alkane protons have the highest magnetic fields.

Carboxylic acids are a class of organic compounds derived from alkanes. Carboxylic acids have a COOH functional group called a carboxyl group.

The carboxyl group of a carboxylic acid is formed from a carbon atom (C) bonded to a hydrogen atom with a double bond (C=H) to a hydroxyl group (-OH) with a single bond. Carboxylic acids have many uses for humans as they are precursors to the formation of other compounds. For example, the formation of esters, ketones, as well as aldehydes.

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The propagation step in the free radical chlorination of methane is:

∙CH₃ + Cl∙ → CH₃Cl

In the free radical chlorination of methane, the propagation step is a crucial part of the overall reaction mechanism. It involves the interaction between a methyl radical (∙CH₃) and a chlorine radical (Cl∙), resulting in the formation of chloromethane (CH₃Cl).

During the propagation step, the methyl radical (∙CH₃) and chlorine radical (Cl∙) combine to produce chloromethane (CH₃Cl). This reaction occurs through the abstraction of a hydrogen atom from methane by the chlorine radical, forming a new C-Cl bond and generating a new methyl radical. The overall reaction can be represented as follows:

∙CH₃ + Cl∙ → CH₃Cl

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A replacement reaction is one wherein a set of atoms is replaced by another atom in a molecule. In the given reactions is 2Na + Cl₂ → 2NaCl is not a replacement reaction.

A displacement reaction also known as a replacement reaction can be defined as one wherein an atom is displaced by another atom in a molecule. For example, when iron (Fe) is added to a solution of copper sulfate (CuSO₄), it displaces the copper (Cu) metal.

A single replacement reaction can be described as a kind of redox reaction when an element moves out of a compound, one element is replaced by the other in its own compound.

\(A +BC\longrightarrow AB +C\)

Double replacement reactions take place mostly in aqueous solutions wherein the ions precipitate and the exchange of ions occurs. The double replacement reaction can be represented as:

\(AB +CD\longrightarrow AC +BD\)

Therefore, option (D) is correct.

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Among SF2, H2O, NO2-, H2O2, and CO2, H2O has 1 double bond and 1 single bond in its Lewis structure.

To determine which molecule or ion has 1 double bond and 1 single bond in its Lewis structure, let's examine the Lewis structures for each of the given molecules and ions:

1. SF2 (Sulfur difluoride):

  Lewis structure:

      F

      |

  F-S-F

  In SF2, there are no double bonds. Both sulfur (S) and fluorine (F) form single bonds.

2. H2O (Water):

  Lewis structure:

    H

    |

  H-O-H

  In H2O, there is one double bond between the oxygen (O) atom and one of the hydrogen (H) atoms.

3. NO2- (Nitrite ion):

  Lewis structure:

   O

  ║

  N=O

  In NO2-, there is one double bond between the nitrogen (N) atom and one of the oxygen (O) atoms.

4. H2O2 (Hydrogen peroxide):

  Lewis structure:

    H     O

    |     |

  H-O-O-H

  In H2O2, there are no double bonds. Both oxygen (O) atoms form single bonds.

5. CO2 (Carbon dioxide):

  Lewis structure:

     O

    ║

  O=C=O

  In CO2, there are two double bonds between the carbon (C) atom and the oxygen (O) atoms.

From the given molecules and ions, the one that has 1 double bond and 1 single bond in its Lewis structure is H2O (Water).

Therefore, H2O has 1 double bond and 1 single bond in its Lewis structure.

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