Calculate the molarity of a solution prepared by dissolving 12.9 gg of Na2CrO4Na2CrO4 in enough water to produce a solution with a volume of 720. mL

Answer:

6.22 mol

Explanation:

I think so but I don't know just yet

sorry if im wrong

Answer: C.  Waves don't move matter, just energy.

Explanation:

Answer:

Know this

1mole of a substance contains 6.022x10²³molecules

Now

8.55x10^-15moles x 6.022x10²³molecules/1mole

=5.15x10^9molecules.

The chemoheterotroph Proteus vulgaris is a rod-shaped bacterium that is classified with Enterobacteriaceae.

Proteus vulgaris is a Gram-negative bacterium that is rod-shaped and facultative anaerobic in nature. The bacterium is known for its natural capacity to swarm, which means it can easily move through solid or semi-solid surfaces, including media. It has been identified as a chemoheterotroph.

                                    Enterobacteriaceae is a family of Gram-negative, non-spore-forming bacilli. Proteus vulgaris is one of the members of this family, as well as some other genera such as Escherichia coli, Salmonella, Shigella, and many others. All members of the Enterobacteriaceae family are aerobic or facultatively anaerobic, and most are motile and have peritrichous flagella.

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Answer:

False

Explanation:

Answer:

false

Explanation:

false

When the Earth is in the position shown above, the Southern Hemisphere experiences the start of summer because that hemisphere is tilted towards the Sun.

What is Earth?

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CH₃OH and H₂O interact through hydrogen bonding because it contains an alcohol group, CH₃OH has the potential to produce a hydrogen bond when combined with water.

A new hydrogen bond is developing between an atom of hydrogen that is already covalently bound to another atom that is electronegative and has an unpaired pair of electrons. Not to be confused with a covalent link to a hydrogen atom, hydrogen bonding is a unique form of dipole-dipole attraction that occurs between molecules.

It is the result of an attractive force between two highly electronegative atoms, one of which is a hydrogen atom that is covalently bound to a very electronegative atom such as a nitrogen, oxygen, or fluorine atom, and the other of which is another very electronegative atom.

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The oxidation number of nitrogen varies depending on the compound it is in.


In nitrogen gas (N2), nitrogen has an oxidation number of 0 because it is a diatomic molecule and the oxidation number of each nitrogen atom cancels out the other.

In ammonia (NH3), nitrogen has an oxidation number of -3 because hydrogen has an oxidation number of +1 and the overall charge of the molecule is 0.

In nitrate ion (NO3-), nitrogen has an oxidation number of +5 because oxygen has an oxidation number of -2 and the overall charge of the ion is -1.

In nitrite ion (NO2-), nitrogen has an oxidation number of +3 because oxygen has an oxidation number of -2 and the overall charge of the ion is -1.

In nitrogen oxide (NO), nitrogen has an oxidation number of +2 because oxygen has an oxidation number of -2 and the overall charge of the molecule is 0.

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The appropriate term for the following mixtures are;

A mixture is a substance made when two or more substances are combined, but they are not combined chemically.

The components of a mixture can be easily separated because each component keep their original properties or identity.

A homogenous mixture is a gaseous, liquid or solid mixture that has the same proportions of its components throughout a given sample e.g. juice while heterogenous mixture is a mixture in which the composition is not uniform throughout the mixture e.g. smoke.

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Answer:

Its in my screenshot

Explanation:

Answer: It is a pure substance because it can't be broken down.

Explanation:  The element can't be broken down because it is a pure substance. Elements are generally metals, non-metals, or metalloids. Compounds, in another way, are likewise clean wealthy when two or more fundamentals are linked chemically in an established ratio.

a. Silver coin - Element (Silver is a pure element and is not chemically combined with any other element in a silver coin)

b. Air - Mixture (Air is a mixture of gases, primarily nitrogen and oxygen, with trace amounts of other gases and particles)

c. Coffee - Mixture (Coffee is a mixture of various compounds such as water, caffeine, and organic compounds that give it its flavour and aroma)

d. Soil - Mixture (Soil is a mixture of various substances such as minerals, organic matter, water, and air)

My everyday experiences influenced my response because I have come across these examples in my daily life and have been taught about them in science classes. For example, I know that air is composed of different gases and particles, and that soil is made up of a mixture of substances, including minerals and organic matter. Similarly, I know that a silver coin is made of pure silver and that coffee is made of various compounds.

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Answer:

astronots there already up there so they might as well do it.

Answer:

2.61

Explanation:

pH+pOH=14, so sub in 11.39 for pOH, then subtract it over to get pH=2.61

if you have any questions, leave them in the comments and i will try to answer them, if this helped, pls give brainliest.

Answer:

Explanation: It will not

a. NH4NO3: acidic b. AgNO3: neutral c. Na2CO3: basic d. Ca(CIO4)2: acidic

The acidity or basicity of salt can be determined by identifying the acid and base used to form the salt and then analyzing the relative strength of the acid and base. If the acid is strong and the base is weak, the resulting salt will create an acidic solution when dissolved in water. If the acid and base are weak, the resulting salt will create a basic solution when dissolved in water.

If the acid and base are strong, the resulting salt will create a neutral solution when dissolved in water. For example, in the case of NH4NO3, NH4+ is the conjugate acid of the weak base NH3, and NO3- is the conjugate base of the strong acid HNO3. Since the conjugate acid NH4+ is soft and the conjugate base NO3- is neutral, the resulting salt NH4NO3 will create an acidic solution when dissolved in water.

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Answer:

A. Antibiotic resistance can sometimes be shared among bacteria.

B. Mutation can cause antibiotic resistance.

D. Antibiotics killing bacteria while allowing mutated bacteria to live is an example natural selection.

Explanation:

Identifying: Archaea have cell walls that lack peptidoglycan and have membranes that enclose lipids with hydrocarbons rather than fatty acids (not a bilayer). ... Bacteria: cell membrane contains ester bonds; cell wall made of peptidoglycan; have only one RNA polymerase; react to antibiotics in a different way than archea do.

Hope this helps, I reported some answer that was absurd, not applicable, incomplete and confusing

Mutation can cause antibiotic resistance, Bacteria that become resistant are an example of evolution. Antibiotics killing bacteria while allowing mutated bacteria to live is an example natural selection The correct options are B, D, and C.

Archaea, like bacteria, lack interior membranes but have a cell wall and swim with flagella.

Archaea differ from bacteria in that their cell wall lacks peptidoglycan and their cell membrane contains ether linked lipids rather than ester linked lipids.

The dispersion of antibiotic resistance in pathogenic bacteria is a simple and elegant example of natural selection at work.

Bacteria can develop antibiotic resistance through mutations that alter antibiotic cellular targets or by acquiring dedicated resistance genes from other bacteria.

Antibiotic resistance can be caused by mutation; bacteria that become resistant are an example of evolution. Natural selection is demonstrated by antibiotics killing bacteria while allowing mutated bacteria to live.

Thus, B, D, and C are correct options.

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Nuclear fusion is a process in which two atomic nuclei combine to form a heavier nucleus, releasing an enormous amount of energy. The key elements involved are hydrogen isotopes, such as deuterium and tritium. Fusion reactions require high temperatures and pressures to overcome the electrostatic repulsion between positively charged nuclei. If successfully harnessed, nuclear fusion has the potential to provide clean, abundant, and sustainable energy, with applications including power generation and fueling spacecraft.

Nuclear fusion is a process that involves the merging of atomic nuclei to release energy. It is the same process that powers the sun and other stars. In the context of energy production, nuclear fusion holds immense potential as a source of clean and abundant energy.

During nuclear fusion, light atomic nuclei, such as isotopes of hydrogen (deuterium and tritium), combine to form a heavier nucleus, typically helium. This process releases an enormous amount of energy due to the conversion of a small fraction of the mass into energy, as described by Einstein's famous equation E=mc².

To initiate and sustain nuclear fusion reactions, extreme conditions are required. The fuel, usually a plasma of deuterium and tritium, must be heated to incredibly high temperatures, around 100 million degrees Celsius. At such high temperatures, the fuel enters a state known as a plasma, where the atomic nuclei are stripped of their electrons, allowing them to move freely.

In addition to high temperatures, high pressures are also necessary to overcome the electrostatic repulsion between the positively charged nuclei. These conditions are typically achieved using powerful magnetic fields or intense laser beams to confine and compress the plasma.

The significance of nuclear fusion lies in its potential to provide clean and virtually limitless energy. Unlike nuclear fission, which produces radioactive waste and carries risks of meltdowns, fusion reactions produce helium as a byproduct, which is harmless. Fusion reactors have the advantage of using abundant fuel sources, with deuterium extracted from water and tritium produced within the reactor.

While significant challenges remain, scientists and engineers are actively working on developing viable fusion reactors. Successful fusion energy production could revolutionize the world's energy landscape, providing a sustainable and environmentally friendly solution to meet the ever-growing energy demands.

Potential applications of fusion energy include powering cities, industries, and transportation with clean electricity. It could also support space exploration missions, enabling long-duration space travel. Furthermore, fusion reactors have the potential to help address climate change by reducing dependence on fossil fuels and mitigating greenhouse gas emissions.

In conclusion, nuclear fusion holds tremendous promise as a clean and abundant energy source. Through ongoing research and technological advancements, the dream of achieving practical fusion energy production is becoming closer to reality, with the potential to transform our energy future and contribute to a more sustainable world.

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The question probable may be:

"Discuss the process and significance of nuclear fusion in the context of energy production. Explain the key elements involved in nuclear fusion reactions and describe the conditions required to initiate and sustain fusion reactions. Provide examples of potential applications or future prospects of nuclear fusion as a source of clean and abundant energy."

The probability of observing at least one ICU admission, among the next six patients hospitalized for COVID-19 is 0.26491. Option A is correct.

The probability of not observing any ICU admission among the next six patients hospitalized for COVID-19:

Probability of not observing ICU admission = 1 - Probability of observing ICU admission

= 1 - 0.05

= 0.95

Probability of no ICU admission among the next six patients hospitalized for COVID-19:

Probability of no ICU admission in one trial = 0.95

Probability of no ICU admission in six trials (patients)

= 0.95 × 0.95 × 0.95 × 0.95 × 0.95 × 0.95

= 0.73509

Now, we can calculate the probability of observing at least one ICU admission among the next six patients hospitalized for COVID-19:

Probability of at least one ICU admission= 1 - Probability of no ICU admission

= 1 - 0.73509

= 0.26491

Therefore, the answer is A.

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A fuel (the reductant) and an oxidant, typically atmospheric oxygen and combustion.

It undergo a high-temperature exothermic redox chemical reaction that results in oxidized, frequently gaseous products and a mixture known as combustion.

Since a flame only appears when substances undergoing combustion evaporate, combustion does not always result in fire, but when it does, a flame is a distinctive sign of the event.

The heat from a flame may be enough energy to make the reaction self-sustaining, even though the activation energy must be overcome to initiate combustion (such as when using a lit match to start a fire).

A convoluted series of simple radical reactions frequently occurs during combustion.

Thus, A fuel (the reductant) and an oxidant, typically atmospheric oxygen and combustion.

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Answer:

Due to presence of a triple bond between the two N−atoms, the bond dissociation enthalpy (941.4 kJ mol  

−1

) is very high. Hence, N  

2

​

 is the least reactive.

Answer:

2,760 grams NaCl

Explanation:

To find grams of NaCl, you need to (1) convert moles of Na to moles of NaCl (via mole-to-mole ratio from reaction) and (2) convert moles of NaCl to grams (via molar mass from periodic table). The final answer should have 3 significant figures based on the given measurement.

2 Na + Cl₂ --> 2 NaCl

Molar Mass (NaCl) = 22.99 g/mol + 35.45 g/mol

Molar Mass (NaCl) = 58.44 g/mol

47.2 moles Na           2 moles NaCl              58.44 grams

----------------------  x  ---------------------------  x  -------------------------  =
                                   2 moles Na                   1 mole NaCl

= 2,758.368 grams NaCl

= 2,760 grams NaCl

Answer:

\(\% \: error = | \frac{origina - expirimental}{original} | \times 100 \\ | \frac{78.40 - 75.70}{78.40} | \times 100 \\ = \frac{2.7}{78.4} \times 100 \\ =3.44 \\ thank \: you\)

Actual yield : 45.752 g ⇒no option

Given

The theoretical yields of Cl₂ : 65.35 g and 68.08 g

Required

The actual yield

Solution

Reaction

4 HCl (aq) + MnO₂ (s) → MnCl₂ (aq) + Cl₂ (g) + 2H₂O (l)

Because there are two theoretical yields, then we can choose the smallest one because the value is usually determined from the limiting reactant (in this reaction the limiting reactant is MnO₂)

So 65.36 g is The theoretical yields of Cl₂

Then the actual yield :

\(\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\actual=\%yield\times theoretical\\\\actual=70\%\times 65.36=45.752\)

The molarity of a solution of 12.9 g fructose and 31.0 g water is 1.26 M.

Molarity is the number of moles of solute dissolved in one liter of a solution. The formula to calculate molarity is:

Molarity (M) = moles of solute / liters of solution

To find the molarity of the given solution, we first need to determine the number of moles of fructose present. We can do this using the molar mass of fructose.

Molar mass of fructose = (6 x 12.01 g/mol) + (12 x 1.01 g/mol) + (6 x 16.00 g/mol)= 180.18 g/mol

The number of moles of fructose present in 12.9 g can be calculated as:

Number of moles of fructose = mass of fructose / molar mass of fructose= 12.9 g / 180.18 g/mol= 0.0716 mol

Number of moles of water = mass of water / molar mass of water= 31.0 g / 18.02 g/mol= 1.722 mol

Now, we can calculate the total volume of the solution.

Total mass of the solution = mass of fructose + mass of water= 12.9 g + 31.0 g= 43.9 g

We can convert this to liters using the density of water.

Density of water = 1 g/mL= 1000 g/L43.9 g = 0.0439 L (volume of solution)

Now that we know the number of moles of fructose and water and the volume of the solution, we can calculate the molarity:

Molarity (M) = moles of solute / liters of solution= 0.0716 mol / 0.0439 L= 1.26 M

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The pH of the buffer prepared by mixing 50.3 mL of 0.196 M NaOH with 141.2 mL of 0.231 M acetic acid is 4.74.

To calculate the pH of the buffer, we'll use the Henderson-Hasselbalch equation: pH = pKa + log([A⁻ ]/[HA]). First, determine the moles of NaOH and acetic acid (CH₃COOH):
Moles NaOH = (0.196 mol/L) x (0.0503 L) = 0.009858 mol
Moles CH₃COOH = (0.231 mol/L) x (0.1412 L) = 0.0325972 mol
Next, find the moles of acetic acid that react with NaOH to form the conjugate base (CH₃COO⁻ ):
Moles CH₃COO⁻ = 0.009858 mol
Moles CH₃COOH (after reaction) = 0.0325972 - 0.009858 = 0.0227392 mol
Now, calculate the concentrations of CH₃COOH and CH₃COO⁻ :
[CH₃COOH] = 0.0227392 mol / (0.0503 L + 0.1412 L) = 0.12086 M
[CH₃COO⁻] = 0.009858 mol / (0.0503 L + 0.1412 L) = 0.05219 M
Finally, apply the Henderson-Hasselbalch equation:
pH = 4.75 + log(0.05219 / 0.12086) = 4.74

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The option that is an intensive property is brittle (option C).

Intensive property of a material is that property that does not depend on the amount or shape of the material, a property of the material at a specific point in space.

The properties of matter that do not depend on the size or quantity of matter in any way are referred to as an intensive property of matter.

Intensive properties of matter include the following: temperature, density, colour, melting and boiling point, etc., because they will not change with a change in size or quantity of matter.

Therefore, brittleness is an intensive property of a material.

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The following action will increase the equilibrium concentration of an inert gas (such as n2) in water: decreasing the pressure of the gas above the liquid. On the other hand, increasing the volume of water and decreasing the temperature of the water would not affect the equilibrium concentration of the inert gas in the water. Therefore, option 1 and 2 are incorrect.

When an inert gas such as nitrogen gas (N2) is added to water, it is not soluble in the water. As a result, equilibrium is established between the gaseous nitrogen and the nitrogen dissolved in the water.The concentration of an inert gas in water will increase if the pressure of the gas above the liquid is reduced. Because the gas will move toward the area of low pressure, more gas molecules will be able to dissolve into the water when the pressure above the water decreases.On the other hand, increasing the volume of water and decreasing the temperature of the water would not affect the equilibrium concentration of the inert gas in the water. Therefore, option 1 and 2 are incorrect.

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Answer:

a b d

Explanation: