which surface events are examples of weathering

The sum is given as 27.258 +40.13 =   67.39

The term significant figures refers to the number of nonzero values in a digit. It refers to the number of figures that we could assign a place value in a given measurement.

We can see that in the number 27.258, there are five significant figures while in the number 40.13 there are four significant figures. This means that the result ought to have four significant figures.

We have the sum; 27.258 +40.13 =   67.39. This is the result because the number of significant figures must correspond to the least number of significant figures in the sum.

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An acylation phase and a diacylation phase are the first two phases of the reaction. The peptide bond is broken and an ester is created between the substrate and enzyme in the first phase.

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Answer:

E = 3.6×10⁻¹⁹ J

Explanation:

Given data:

Wavelength = 550 nm  (550 ×10⁻⁹ nm)

Energy of wave = ?

Solution:

Formula:

E = h c/λ

c = 3×10⁸ m/s

h = 6.63×10⁻³⁴ Js

Now we will put the values in formula.

E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s /550 ×10⁻⁹ nm

E = 19.89×10⁻²⁶ J.m /550 ×10⁻⁹ nm

E = 0.036×10⁻¹⁷ J

E = 3.6×10⁻¹⁹ J

The current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

To calculate the current in amperes, we need to use Faraday's laws of electrolysis and the stoichiometry of the reaction.

Faraday's laws state that the amount of substance produced or consumed during electrolysis is directly proportional to the quantity of electricity passed through the cell. The relationship is given by:

Q = nF

Where Q is the electric charge in coulombs (C), n is the number of moles of substance involved in the reaction, and F is Faraday's constant, which is equal to 96,485 C/mol.

In this case, the substance being produced is Cl2, and we know the mass of Cl2 produced, which is 4.8 x 10^5 g.

First, we need to calculate the number of moles of Cl2 produced:

Molar mass of Cl2 = 35.45 g/mol

Moles of Cl2 = mass / molar mass = (4.8 x 10^5 g) / (35.45 g/mol) ≈ 1.354 x 10^4 mol

Now we can calculate the quantity of electricity passed through the cell using Faraday's laws:

Q = nF

Q = (\(1.354 x 10^4\)mol) * (96,485 C/mol)

Q ≈ 1.308 x 10^9 C

The quantity of electricity is given in coulombs. To find the current, we need to divide this value by the time in seconds.

Given that the time is 18 hours, we convert it to seconds:

Time = 18 hours * 60 minutes/hour * 60 seconds/minute

Time = 6.48 x 10^4 seconds

Finally, we can calculate the current:

Current (I) = Q / Time

I = (1.308 x 10^9 C) / (6.48 x 10^4 s)

I ≈ 2.02 x 10^4 Amperes

Therefore, the current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

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Answer:

Exothermic reaction!

Explanation:

Exo -> Releases Heat

Endo -> Absorbs Heat

Answer:

because some things have a higher density than other things

Explanation:

Answer:

some things float bc they have air inside of them which makes them rise bc air rises and gravity pulls so theyre working against each other. some things sink bc theyre heavy and gravity is already pulling them down so them being heavy just makes them sink faster. hope this helps!!!

Explanation:

Answer:

hedges are used to be courteous in expressing (counterclaims)

The new volume of the balloon after heating it to a temperature of 51 °C is approximately 2.39 L.

Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.

It is expressed as;

\(\frac{V_1}{T_1} =\frac{V_2}{T_2}\)

Given that:

Substituting the given values and solve for V₂:

\(V_1T_2 = V_2T_1\\\\V_2 = \frac{V_1T_2}{T_1} \\\\V_2 = \frac{2.2\ *\ 324.15}{298.15 }\\ \\V_2 = 2.39 \ L\)

Therefore, the final volume is 2.39 litres.

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Answer:

56.67 g of NH₃.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

N₂ + 3H₂ —> 2NH₃

Next, we shall determine the masses of N₂ and H₂ that reacted and the mass of NH₃ produced from the balanced equation. This is illustrated below:

Molar mass of N₂ = 14 × 2 = 28 g/mol

Mass of N₂ from the balanced equation = 1 × 28 = 28 g

Molar mass of H₂ = 1 × 2 = 2 g/mol

Mass of H₂ from the balanced equation = 3 × 2 = 6 g

Molar mass of NH₃ = 14 + (3×1) = 14 + 3 = 17 g/mol

Mass of NH₃ from the balanced equation = 2 × 17 = 34 g

SUMMARY:

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂ to produce 34 g of NH₃

Next, we shall determine the limiting reactant. This can be obtained as follow:

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂.

Therefore, 80 g of N₂ will react with = (80 × 6)/28 = 17.14 g of H₂.

We can see from the calculation made above that a higher mass (i.e 17.14 g) of H₂ than what was given (i.e 10 g) is required to react completely with 80 g of N₂. Thus, H₂ is the limiting reactant and N₂ is the excess reactant.

Finally, we shall determine the maximum mass of ammonia (NH₃) produced from the reaction.

To obtain the maximum mass of NH₃, the limiting reactant will be used because all of it is consumed in the reaction.

The limiting reactant is H₂ and the maximum mass of NH₃ can be obtained as follow:

From the balanced equation above,

6 g of H₂ reacted to produce 34 g of NH₃.

Therefore, 10 g of H₂ will react to produce = (10 × 34)/6 = 56.67 g of NH₃.

Therefore, 56.67 g of NH₃ is produced from the reaction.

The volume change when all of the reactants combine to form products then the volume increases by a factor of 6/5

Changing the volume occupied by a gas will change its concentration, and therefore, change the rate at which it reacts with other substances called volume in the reaction

Here given reaction is

2CH₄O( g) + 3O₂( g) → 4H₂O( g) + 2CO₂( g)

Then, if the reaction is conducted and maintained at standard temperature and pressure (STP) then all the reactant combine to form product then the volume increases by a factor of 6/5

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The balanced chemical equation for the reaction between potassium hydroxide (KOH) and potassium chloride (KCl) is:

KOH + HCl → KCl + H2O

it can be seen that for every one mole of potassium hydroxide that reacts, one mole of potassium chloride is produced.

Therefore, if 3 moles of potassium hydroxide react completely, then 3 moles of potassium chloride will be produced. This is because the mole ratio of potassium hydroxide to potassium chloride is 1:1.

Thus, the answer is 3 moles of potassium chloride.

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The creation of water (H2O), as well as the production of heat and light, signal the release of bond energy when hydrogen gas (H2) combines with oxygen gas (O2).

Bond Energy, commonly referred to as average bond enthalpy or just bond enthalpy, is a measurement that provides information about how strong a chemical bond is. "The average value determined from the bond dissociation enthalpies (in the gaseous phase) of all the chemical bonds of a certain type in a given chemical compound," is how the word "bond energy" is defined by the IUPAC. As a result, the average amount of energy needed to break one of these chemical bonds may be thought of as the bond energy of a chemical bond in a specific molecule.

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The energy of the photon of light can be obtained as 6.27 * 10^-20 J.

We know that a photon has to to do with a particular unit of light. We know that light can be said to be composed of very tiny corpuscles and these corpuscles of light is what we call the photon of the light.

We can be able to us the equation that is derived by Max Plank to be able to get the value of the energy of the photon of light. Now we know that a photon of light can have an energy that is able to be obtained by;

E = hf

h = Plank's constant

f = Frequency

Then;

E = 6.6 * 10^-34 Js * 9.5 * 10^13 Hz

= 6.27 * 10^-20 J

Thus as we can see from the parameters in the question, the energy of the photon is 6.27 * 10^-20 J.

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The mass of the unknown element cobalt is obtained as 40 g. This can be seen from the calculation that we have in the solution.

If you have a compound that contains an unknown element, you can use the molar mass of the compound to find the relative atomic mass of the unknown element

We can see that the question has already given us the mass of the sample as we have and the percentage of the cobalt that we have in the sample.

50 = x/80 × 100

x = 50/100 × 80

= 40 g

Thus we would have a total of about 40 g of cobalt in the sample.

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Missing parts;

A sample of the compound weighs 80 grams.  If the mass percent of cobalt is 50%, How many grams of cobalt are in the sample?

Considering the definition of pH, the pH is 6.35 and the solution is acidic.

pH is the Hydrogen Potential and it is a measure of acidity or alkalinity. pH indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]

The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.

In this case, being [H⁺]=4.5×10⁻⁷ M, you can replace this value in the definition of pH:

pH= -log (4.5×10⁻⁷ M)

Solving:

pH= 6.35

Finally, the pH is lower than 7, the solution is acidic.

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The aromatic ring in phenacetin exhibits an AB pattern because it has two mutually coupled nuclei that are unrelated to other protons or whose shift differences is equal to the coupling constant.

Deshielding occurs for the ring protons of benzene due to their larger chemical shift (7.3 ppm vs. 5.6 ppm for the vinylic protons in cyclohexene) and the fact that the magnetic field induced outside of the ring is the same orientation as that of the external field.

Protons are present in benzene at levels of 6–8 ppm.This value is larger than that of the protons in those other hydrocarbon like alkanes & alkenes because of the aromatic ring's deshielding effect.

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The percentage of water entering the small intestine that is absorbed by the small intestine is 98%

Percentage = (Volume absorbed / Total volume) × 100

Percentage = (9400 / 10200) × 100

Percentage absorbed by the small intestine = 92%

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N₂0₄ is the formula represents the binary molecular compound dinitrogen tetroxide. Therefore, option B is correct.

Binary molecular compounds are made up of exactly two nonmetal elements. HF, NO2, and P2O5 are a few examples. It is extremely simple to name binary molecular compounds. The first element is given its element name, followed by ide; the second element is given its root (hydr, bor, carb, ox, fluor, etc.).

In N₂0₄ molecule there are two nitrogen atoms at the suffix so, it is binary and in oxygen atom its suffix is 4 so, it is tetroxide. Therefore, N₂0₄ is the formula represents the binary molecular compound dinitrogen tetroxide.

Thus, option B is correct.

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Answer:

pretty sure its B

Explanation:

Answer:

b :)

Explanation:

right on edge 2020

Answer:

Copper, Sodium, and Francium

Explanation:

Answer:

hi here goes your answer

Explanation:

iv. The lower the PH, the weaker the base

Answer:

4 or 3 atoms; leaning towards 4 more

Explanation:

Answer:

3 atoms

Explanation:

Answer:

43.5

Explanation:

Hope that helps

The moles of \(N_2\) and \(H_2\) that were present originally in the reaction will be 1.5 moles and 2.5 moles respectively.

The two reactants,  \(N_2\) and \(H_2\), react in a closed container to form \(NH_3\). The normal stoichiometric ratio of the reaction is according to the following equation:

\(N_2 (g) + 3H_2 (g) --- > 2NH_3 (g)\)

The stoichiometric ratio of  \(N_2\), \(H_2\), and \(NH_3\) is 1:3:2.

This means for every 1 mole of ammonia formed, 0.5 moles of \(N_2\) and 1.5 moles of \(H_2\) is required.

However, 1 mole of \(N_2\) and 1 moles of \(H_2\) remained after the reaction has ceased.

Thus, total amount of  \(N_2\) present originally = 1 + 0.5

                                                                           = 1.5 moles

Total amount of  \(H_2\) present originally = 1 + 1.5

                                                               = 2.5 moles

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INFORMATION:

We have the next balanced ionic equation:

2Al(s) + 3Cu²⁺(aq) → 2Al³⁺(aq) + 3Cu(s)

And we must determine the half-reaction that represents the reduction that occurs

STEP BY STEP EXPLANATION:

To determine it we must use the given information about the ionic charge of atoms given in the formula

We can see that there is a reduction in the formula since we initially have 3Cu²⁺ and then we obtain 3Cu

Since the initial ionic charge for Cu is 2+, we need to add 2e¯ to obtain Cu. Then, the reduction half-reaction would be Cu²⁺ + 2e¯ → Cu

ANSWER:

(4) Cu²⁺ + 2e¯ → Cu

Statements a, b, c, d, and e are correct In context to earths atmosphere.

The most abundant gas in the atmosphere is indeed oxygen, and carbon dioxide is important for plants as it is used in the process of photosynthesis. The troposphere is the layer closest to the Earth's surface and it does shield us from chunks of rock from space. The stratosphere is located 50 to 80 kilometers from Earth's surface and it does contain the ozone layer which protects us from ultraviolet radiation. The troposphere gets colder the higher you go because the temperature decreases with altitude.

Statement f is not correct. The amount of water vapor in the air varies depending on the humidity and temperature. Water vapor is not present in the atmosphere in constant amount.

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Correct question is:

Which statements about Earth’s atmosphere are correct? Check all that apply.

a. The most abundant gas in the atmosphere is oxygen. Carbon dioxide in the atmosphere is important for plants.

b. The troposphere shields Earth from chunks of rock from space.

c. The stratosphere is located 50 to 80 kilometers from Earth’s surface.

d. The troposphere gets colder the higher you go.

e. The ozone in the stratosphere protects us from ultraviolet radiation.

f. The amount of water vapor in the air is nearly constant.

Answer:

not the right answer but I need this for the answer the question thing