Many heterogeneous catalysts are deposited on high-surface area supports. Why?

Answer:

Earplugs

Explanation:

Because sound waves absorb most sound, the sound is coming from the earplugs which creates the most sound waves rather than water, tissue paper, and air.  Hope i helped :)

Answer:

Earplugs

Explanation:

The silica (SiO2) content in magma can affect its behavior in several ways: Viscosity, Explosive Eruptions, Cooling Rate, Composition of Rocks Formed.

Viscosity: Silica content has a significant impact on the viscosity of the magma, which refers to its resistance to flow. Magmas with higher silica content tend to have a higher viscosity, making them more resistant to flow and less likely to erupt.

Explosive Eruptions: Magmas with high silica content tend to be more explosive when they erupt, because the high viscosity prevents the release of trapped gas. When gas finally escapes, it creates a violent explosion.

Cooling Rate: Silica-rich magmas tend to cool more slowly than magmas with low silica content, allowing more time for mineral crystals to grow and form solid rock.

Composition of Rocks Formed: The silica content of magma affects the type of rocks that are formed when it cools and solidifies. Magmas with high silica content tend to form volcanic rocks such as rhyolites and granites, while magmas with low silica content tend to form basaltic rocks.

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Many agricultural practices involve the emission of greater amounts of methane. The two agricultural practices which result in methane emission is manure management techniques and rice cultivation. The correct options are C and D.

The methane is defined as the simplest hydrocarbon with a chemical formula CH₄. It contains four 'H' atoms and one 'C' atom and it is the simplest alkane.

The main sources of methane emissions from agriculture are enteric fermentation, manure management, rice cultivation and residue burning. The production of methane also occurs animal wastes. Methane emissions occurs from paddy rice when soils are flooded.

Thus the correct options are C and D.

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Answer:

D

Explanation:

I took the test

Answer:

D took the test

Explanation:

Answer:

B

Explanation:

Answer:

The answer is

Explanation:

To find the number of moles of an element given the number of entities contained in that element , we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

N = 1.204 × 10²⁴ lithium atoms

We have

\(n = \frac{1.204 \times {10}^{24} }{6.02 \times {10}^{23} } \\ \)

We have the final answer as

Hope this helps you

Answer: are you in times4learning?

Explanation:

The ideal of combining individual liberty with material equality has not yet been achieved. This goal is as challenging as the transformation of lead into gold. The two concepts appear to be incompatible. The political philosophy that underpins this ideal is liberalism.

This idea arose from the Enlightenment era, and it emphasizes individual liberty, economic freedom, and political rights. Liberalism advocates that the government should have a limited role in economic and social affairs. It is a political idea that has received a lot of criticism over the years. Critics of liberalism argue that this ideal has failed to promote economic growth and reduce inequality.

They point out that it has led to a concentration of wealth among a small elite, resulting in an unequal distribution of resources. Nonetheless, liberalism continues to be a popular political philosophy, and many countries embrace it. However, it remains a challenge to combine individual liberty and material equality, given their conflicting nature. To achieve this goal, societies must strive to find the right balance between individual freedom and collective well-being.

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Answer:

c. ammonia window cleaner

Explanation:

Window cleaners contain ammonia (a base) for the purpose of removing the dust and grease on the windows.

digestive juices, orange(a citrus) juice, and vinegar are all highly acidic.

... give me brainliest please :)) ...

The pH and the pOH of an aqueous solution that is 0.045 M in HCl(aq) and 0.095 M in HBr(aq) at 25 °C is 1.35, and 12.98 respectively.

To calculate the pH and pOH of the solution, we need to use the concentration of the acidic solutions and the dissociation constants of HCl and HBr.

First, calculate the pH:

For HCl (aq):

[HCl] = 0.045 M

HCl is a strong acid and dissociates completely in water, so the concentration of H⁺ ions is equal to the concentration of HCl:

[H⁺] = 0.045 M

Taking the negative logarithm (base 10) of the H⁺ concentration gives us the pH:

pH = -log10(0.045)

pH = 1.35

Now, let's calculate the pOH:

For HBr(aq):

[HBr] = 0.095 M

HBr is also a strong acid, and its dissociation is similar to HCl. The concentration of H⁺ ions is equal to the concentration of HBr:

[H⁺] = 0.095 M

Again, taking the negative logarithm (base 10) of the H⁺ concentration gives us the pH:

pH = -log10(0.095)

pH = 1.02

Since pH + pOH = 14 (at 25 °C), we can calculate the pOH:

pOH = 14 - pH

pOH = 14 - 1.02

pOH = 12.98

Therefore, the pH of the solution is approximately 1.35, and the pOH is approximately 12.98.

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Answer:

The atomic number and the number of protons are the same so I am only going to list the atomic number. In order from top to bottom.

1

1

11

22

47

9

2

31

31

The resonance structures of 4-tert-butylphenol can be drawn as shown below:

   H                H

   |                |

H-C--C--C--C-O-H    H-C--C--C--C-O-

   |                |     |

   H                H     H
In these resonance structures, the aromatic carbons that have high electron density are the ones that are directly attached to the oxygen atom of the hydroxyl group (marked with a red circle in the image). This is because the oxygen atom is highly electronegative and therefore attracts electrons towards itself, increasing the electron density at these aromatic carbons.
The reason why we obtain this product in the experiment is due to the resonance stabilization of the molecule. Resonance structures allow for the delocalization of electrons, which in turn stabilizes the molecule and lowers its energy. This makes the molecule more stable and therefore more likely to be formed as a product in the experiment.

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The answer of the following system at equilibrium is as follows, 1. False, 2. True. 3. False, 4. True, 5. True.

1. False (F): Since the reaction is exothermic (ΔH° = -108 kJ/mol), increasing the temperature will favor the reverse reaction, not the production of COCl2. According to Le Chatelier's principle, adding heat to an exothermic reaction will shift the equilibrium towards the reactants, thus decreasing the amount of COCl2.

2. True (T): Increasing the pressure (by decreasing the volume) will favor the side with fewer moles of gas. In this reaction, there are 2 moles of gas on the reactant side and 1 mole of gas on the product side. Therefore, increasing the pressure will favor the production of COCl2.

3. False (F): Increasing the volume will lower the pressure, favoring the side with more moles of gas. In this case, it will shift the equilibrium towards the reactants (CO and Cl2), thus not favoring the production of COCl2.

4. True (T): Removing COCl2 from the system will shift the equilibrium to the right, favoring its production. According to Le Chatelier's principle, when a product is removed from the system, the equilibrium will adjust to replace the lost product.

5. True (T): Adding Cl2 to the system will shift the equilibrium to the right, favoring the production of COCl2. According to Le Chatelier's principle, when a reactant is added to the system, the equilibrium will adjust to consume the added reactant, thus increasing the amount of product formed.

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In an air-conditioning system, the refrigerant undergoes a cycle of evaporation and condensation to cool the air. The refrigerant starts as a low-pressure gas in the evaporator coil, where it absorbs heat from the surrounding air and evaporates into a low-pressure gas. This evaporation process cools the air as well. The evaporator coil plays a crucial role in this system by facilitating the evaporation of the refrigerant and cooling the air.

On the other hand, the refrigerant transitions from a high-pressure gas to a high-pressure liquid in the condenser. The condenser is responsible for releasing the heat absorbed by the refrigerant in the evaporator to the surrounding air. As the refrigerant condenses into a high-pressure liquid, it releases heat, allowing it to transfer the heat from the inside of a building to the outside.

This cycle of evaporation in the evaporator and condensation in the condenser enables the refrigerant to remove heat from the indoor space and release it outside. By continuously circulating the refrigerant and repeating this process, an air-conditioning system can cool the air inside a building and maintain a comfortable temperature.

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Answer:

vegetative reproduction and asexual reproduction

Explanation:

Answer:

Asexual and vegetation reproduction

Explanation:

Answer:

D.) an opera singer singing at a frequency of 2100 Hz

Explanation:

Wavelength is inversely proportional to frequency.

The one having the LONGEST wavelength is  a lion growling at a frequency of 85 Hz and the correct option is option A.

The electromagnetic spectrum is a range of frequencies corresponding to wavelengths which are a few kilometres to a fraction of the size of an atomic nucleus in the spectrum of electromagnetic waves.

As a wave, light has several basic properties that describe it. One is frequency, which counts the number of waves that pass by a given point in one second.

Another is wavelength, the distance from the peak of one wave to the peak of the next. These properties are closely and inversely related: The larger the frequency, the smaller the wavelength — and vice versa.

A third is energy, which is similar to frequency in that the higher the frequency of the light wave, the more energy it carries.

Therefore, The one having the LONGEST wavelength is  a lion growling at a frequency of 85 Hz and the correct option is option A.

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Answer: a. 1,200 mL

Explanation:

20 x 12 x 5 = 1,200

(L x W x H)

Answer:

Explanation:

6 electrons

carbon dioxide, C has atomic number 6 so it has 6 electrons and oxygen has atomic no 8, i.e 16 electrons.

Universe, Stars, Planets, Asteroids

Answer:

Universe, Stars, Planets, Asteroids

Explanation:

First, let's write the balanced chemical reaction:

2 H2O2 ---MnO2--> 2 H2O + O2

This reaction is a b. Decomposition Reaction of hydrogen peroxide.

Step 1. Let's transform 2.11 mg of H2O2 into moles using the following equation mole = mass / molar mass

Step 2. We are going to use the equation proportion to calculate the quantity in moles of each compound.

Step 3. We are going to transform moles into grams of each compound using the following equation: mass = mole x molar mass

Step 1.

We need to transform 2.11 mg to g. We just need to divide by 1000,

So: 2.11 x 10^-3 g of H2O

mole = 2.11 x 10^-3/34.02

mole = 6.20 x 10^-5 moles

Step 2.

2 moles of H2O2 ---- 2 moles of H2O

6.20 x 10^-5 moles ---- x moles of H2O

x = 6.20 x 10^-5 moles of H2O

2 moles of H2O2 ---- 1 moles of O2

6.20 x 10^-5 moles ---- x moles of O2

x = 3.10 x 10^-5 moles of O2

Step 3.

molar mass of O2 : 32 g/mol

molar mass of H2O: 18 g/mol

mass of H2O = 6.20 x 10^-5 x 18 = 1.12 x 10^-3 g

mass of O2 = 3.10 x 10^-5 x 32 = 9.92 x 10^-4 g

Answer:

C

Explanation:

Hope it helps ~

a. The expected freezing-point depression of the  0.200 m KNO₃ solution is   - 744° C.

b. The expected freezing-point depression is not gonna match the actual freezing-point depression.

A smaller amount of different, non-volatile material is added, causing a decrease in the lowest temperature at which a substance freezes. This is known as freezing-point depression. As the concentration of the solute in the solution changes, so does the solvent's freezing point. The molar concentration of the solute is directly proportional to the difference in the solvent's freezing point from that of the pure solvent.

a. Given:

delta T = i × \(K_{f}\) ×m

i = van't Hoff factor, which for KNO₃ is 2.

Δ \(T_{f}\)  = -1.86 ×.2× .2

= - 744° C

b. The value calculated will not match the actual freezing-point depression for this solution because the concentration of an electrolyte is lower, so this concentration, the clustering of ions will hence cause actual (f.p) depression to be less than expected.

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Answer:

Radiation and conduction

Explanation:

The human body lose heat by these two ways, because everything that touches our bodies and is in a temperature below us will receive part of our heat (conduction), and you can figure out that we lose heat by radiation because a human bright in a heat cam

Answer:

Explanation:

A perfect diamond is a single molecule made of carbon atoms.

DNA is a super long molecule that has information uniquely describing every human being.

When two or more atoms chemically bond together, they form a molecule.

They are very small in size.

They have space between them.

They are in constant random motion.

molecules move when Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.

In 1926, French physicist Jean Perrin received the Nobel Prize in physics for proving, conclusively, the existence of molecules.

Molecules can exist in free state because they are very stable.

The smallest particle of a compound capable of existing on its own is a Molecule-not a atom.

First, we must know Avogadro's number:

1 mol of any substance = 6.02x10^23 formula units (ions, atoms, molecules, etc)

Also, we can say this:

1 mol of Li2O = its mass expressed in grams

(from Li2O molar mass = 30 g/mol approx.)

Now,

1 mol Li2O = 30 g = 6.02x10^23 molecules Li2O

30 g Li2O ----------- 6.02x10^23 molecules Li2O

x ----------- 2.8x10^24 molecules Li2O

x = 140 g approximately

Answer: 140 g

A. The integrations for peaks will likely look "off" with respect to one another., is the correct option.

NMR spectroscopy (NMR spectra) is a analytical tool used in chemistry and biochemistry to determine the structure and composition of a molecule by measuring the magnetic properties of its nucleus. NMR spectra provide information about the number of different types of atoms in a molecule, the environment of these atoms, and the distances and angles between them. This information is then used to generate a detailed picture of the molecule's structure and how it is bonding to other molecules.

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Flaxseeds are used in polyjuice potion in the Harry Potter series.

Flaxseed needs to be picked before the sun rises to be used in Polyjuice potion.

Polyjuice Potion is a potion that allows the drinker to assume the form of someone else.

It is one of the most complicated and powerful potions that witches and wizards can brew.

In the second book, Harry Potter and the Chamber of Secrets, Harry, Ron, and Hermione use Polyjuice Potion to disguise themselves as Crabbe, Goyle, and Millicent Bulstrode to interrogate Draco Malfoy to learn his secret.

There are seven stages in the Polyjuice Potion brewing process, which requires flaxseed as one of its ingredients.

The instructions on when to pick flaxseed to be used in Polyjuice potion is not stated in the book.

However, Hermione Granger, one of the main characters in the series, was shown picking Flaxseed in the second book before the sun rose.

The fact that Hermione was picking flaxseed before sunrise indicates that flaxseed should be picked before sunrise to be used in Polyjuice Potion.

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