A thermometer reads a temperature to be 38.0 °C. What is the temperature in
Kelvin? (Kelvin = 'Celsius + 273.15)
K

it's the third one The chemical equation will have two arrows pointing in different directions. !

Answer:

the answer is option 1 2H2+O2

\(M_{A}V_{A}=M_{B}V_{B}\\(80.0)(4.00)=V_{B}(12.4)\\V_{B}=\frac{(80.0)(4.00)}{12.4} \approx \boxed{25.8 \text{ mL}}\)

Answer:

identify and name the landforms in the following diagrams

Compounds produces their hydrated forms by reacting with water molecules. This water content will make their weight measurement slightly erroneous.

Dehydration is the process of removing water from a compound. Dehydration can be done by drying the compounds in room temperature or by heating.

Some compounds mostly existing in the hydrated form such as copper sulphate, magnesium sulphate etc. They rapidly reacts with water and form their hydrated compounds such as hexahydrate, pentahydrated etc according to the number of water molecules attached .

Most of the compounds are existing in their anhydrous form and they can be easily weighed without the extra weight added by the water content absorbed.

If the compound is moisturized from air there may be extra weight of water when we measure its mass. Thus, they have to heated to be dehydrated to correct the weight measurements.

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Answer:

The pressure is 5.62 atm.

Explanation:

An ideal gas is a theoretical gas that is considered to be composed of randomly moving point particles that do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P * V = n * R * T

In this case:

Replacing:

P* 5.005 L= 1.255 mol* 0.082 \(\frac{atm*L}{mol*K}\) *273.5 K

Solving:

\(P=\frac{1.255 mol* 0.082 \frac{atm*L}{mol*K} *273.5 K}{5.005 L}\)

P= 5.62 atm

The pressure is 5.62 atm.

Answer:

0.0723371390261859

Answer:

Scientists noticed that the mass of atoms was (usually) in excess of the known mass of protons present in those elements.

The discovery of neutral particles in the nuclei of atoms is attributed to Ernest Rutherford in 1920.

Answer:

Exothermic Reaction

Product  = Calcium hydroxide + hydrogen

Explanation:

For the 6s subshell, the magnetic quantum number is zero while for the 4f subshell we have -3, -2, -1, 0, 1, 2, 3.

The magnetic quantum number takes on values between 0 to (n - l). It gives the orientations of the sublevels. The four types of quantum numbers are;

For the 6s subshell, the magnetic quantum number is zero while for the 4f subshell we have -3, -2, -1, 0, 1, 2, 3.

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Answer:

0.00182 cm

Explanation:

Area of the aluminum foil = 22.86 cm ×22.86 cm = 522.58 cm^2

Density = mass/area × thickness

Density × area × thickness = mass

Thickness = mass/ Density × area

Thickness = 2.568 g/2.70 g/cm^3 × 522.58 cm^2

Thickness= 0.00182 cm

Answer:

Measure the mass of the empty beaker and record the value.

Add the measured mass of metal to the beaker and record the total mass.

Add excess acid to the beaker containing the metal and allow the reaction to occur.

Once the reaction is complete, reweigh the beaker containing the reaction products.

Calculate the mass of the reaction products by subtracting the initial mass of the beaker and metal from the final mass of the beaker and products.

mass of reaction products = (final mass of beaker and products) - (initial mass of beaker and metal)

By subtracting the initial mass of the beaker and metal from the final mass of the beaker and products, we can determine the mass of the reaction products without removing them from the beaker. This method ensures that all the products are accounted for and no mass is lost during the reaction.

In Part A, "it" refers to "a single idea for the poetry collection."

In Part B, "it" refers to "the correct answer."

A phrase is a group of words that forms a part of a sentence and does not contain a subject and verb. Phrases are used to add structure and detail to sentences, and they can be used to perform various grammatical functions in a sentence.

There are several different types of phrases, including noun phrases, verb phrases, adjective phrases, and adverb phrases.

Therefore, below are some examples of phrases:

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Answer:

B.

Explanation:

just did it

Answer:

32.2 g of Na will produce 43.4 g of Na2O.

Explanation:

The balanced chemical equation for the reaction between sodium and oxygen shows that 4 moles of sodium react with 1 mole of oxygen to produce 2 moles of sodium oxide:

4Na(s) + O2(g) → 2Na2O(s)

To solve this problem, we can use the following steps:

Step 1: Convert the mass of Na given in the problem to moles using the molar mass of Na.

molar mass of Na = 23 g/mol

moles of Na = mass of Na / molar mass of Na

moles of Na = 32.2 g / 23 g/mol

moles of Na = 1.4 mol

Step 2: Use the mole ratio from the balanced chemical equation to determine the moles of Na2O produced.

From the balanced chemical equation, we can see that 4 moles of Na react to produce 2 moles of Na2O.

moles of Na2O = (moles of Na / 4) x 2

moles of Na2O = (1.4 mol / 4) x 2

moles of Na2O = 0.7 mol

Step 3: Convert the moles of Na2O to grams using the molar mass of Na2O.

molar mass of Na2O = 62 g/mol

mass of Na2O = moles of Na2O x molar mass of Na2O

mass of Na2O = 0.7 mol x 62 g/mol

mass of Na2O = 43.4 g

Therefore, 32.2 g of Na will produce 43.4 g of Na2O.

The pressure is directly proportional to temperature (when the pressure decrease the temperature decrease too). Because the air parcel expands so the molecules will not interact with each other as much.

The energy of the particles does not change but the fact that the particles are more spaced out means the parcel is cooler.

so now, the warmer a parcel of air the more water vapor it can hold. so, if a parcel of air cools it's ability to hold water vapor drops and if it drops to a low enough point that is when the water vapor will condense and turn back into liquid water. This is how clouds and precipitation form on the the windward side of the mountain.

Clouds and precipitation form on the windward side of the mountain due to change in temperature and pressure.

Temperature of any substance is directly proportional to the pressure of that substance.

If the temperature of the wind increases so that winds get warmer and at the same time pressure of gas also increases, due to which particles will go far from each other. After this warm air rises up and cools down will condenses to form clouds, after this precipitate will falls on the windward side of the mountain.

Hence due to temperature and pressure precipitate will form on the windward side of the mountain.​

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ANSWER

Fe³⁺ is being reduced

Fe³⁺ + 3e⁻ → Fe

EXPLANATION

Fe³⁺ is reduced as in the reaction, Fe goes from +3 to 0 which indicates the gain of electrons.

The uncertainty in velocity is determined by the lower limit of velocity obtained from the equation. However, without knowing the exact value of the velocity, we cannot determine the specific uncertainty in velocity.

To calculate the uncertainty in velocity, we need to consider the uncertainty in the distance and the mass of the object.

Given that the distance has an accuracy of 10%, we can determine the uncertainty in distance as 10% of 3 nm, which is 0.3 nm.

Now, to find the uncertainty in velocity, we can use the Heisenberg uncertainty principle, which states that the product of the uncertainty in position and the uncertainty in momentum (mass times velocity) is greater than or equal to Planck's constant divided by 4π.

Let's assume the mass of the object is 3 Mg (3 million grams), which is equivalent to 3 x 10^9 g.

Using the uncertainty principle, we can write the equation as follows:

(0.3 nm) * (3 x 10^9 g * v) ≥ h/(4π)

Simplifying, we get:

v ≥ h / (4π * 0.3 nm * 3 x 10^9 g)

Plugging in the known values for Planck's constant (h ≈ 6.626 x 10^(-34) J·s), we can calculate the minimum value of velocity.

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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:

Composition: All hydrocarbons are made up of only two types of atoms: carbon and hydrogen. They are like building blocks that contain carbon and hydrogen stuck together.

Organic Nature: Hydrocarbons are special because they are part of a group of compounds that come from living things or things that were once alive. They have carbon and hydrogen in them, which is what makes them different from other types of compounds.

Explanation:

Under specific temperature and pressure conditions, a gas acts as an ideal gas. Particularly, the optimal conditions for the petrol' behaviour are low pressure and high temperature.

An ideal gas is a hypothetical gas made up of numerous tiny particles moving randomly all the time. Intermolecular forces, molecular size, and volume are all presumptions that apply to ideal gases. Additionally, it is presummated that they collide in completely elastic collisions in which there is no kinetic energy loss. The ideal gas law, PV=nRT, which has P as the pressure, V as the volume, n as the number of moles, R as the gas constant, and T as the temperature, can be used to describe the behaviour of an ideal gas. This law offers a helpful model for how many actual gases behave when exposed to situations like high temperatures and low pressures.

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Answer:  The student's conclusion is inaccurate, smoke is a chemical change, but steam is a physical change.

Explanation:

When boiling water changes into steam, the matter composition of water is still the same (it remains H₂O). In this case, only the physical state of the water is changed from a liquid to a vapor (gas). When collected, the water vapor (gas) returns to its original liquid form proving that NO chemical reaction has taken place.

In contrast, a fire is a combustion chemical reaction that converts a fuel material (such as wood, fuel, or paper) and oxygen into carbon dioxide (CO₂) and water (H₂O). As an exothermic chemical reaction, the fire gives off heat in addition to the gaseous smoke. Unlike boiling, the fire permanently alters the fuel material as a result of the chemical reaction process.

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Answer:

Ok, thank you

Explanation:

Answer:

\(2NH_{3 (g)} + 3O_{2 (g)} +2CH_{4 (g)} --> 2HCN_{(aq)} + 6H_{2}O_{(l)}\)

Explanation:

Answer:

Calculation:

1.2ml x 100mmol/l = 120mmol

Preparation Steps:

1. Measure out 58.44g of NaCl.

2. Dissolve the NaCl in 1 liter of distilled water.

3. Measure out 1.2ml of the solution and transfer it to a separate container.

4. The resulting solution is a 1.2ml of 100mmol/l of standard Nacl.

Based on the observations, the change is physical.

This is because the matter is still the same composition after the change, while a chemical change would change the composition.

Based on the observations, both physical and chemical changes have occurred during the experiment.

Observation 1: Water droplets form on the inside of the glass lid. This is a physical change.

Observation 2: Bubbles rise as the water starts boiling. This is a chemical change.

A physical change is a transformation in a substance's state, shape, or form that does not alter its chemical composition or create new substances. During a physical change, the original substance remains the same, and no chemical bonds are broken or formed.

A chemical change, also known as a chemical reaction, involves the conversion of one or more substances into new substances with different chemical compositions. Evidence of a chemical change includes the production of gas, formation of a precipitate, release or absorption of heat or light, and changes in color and odor.

In observation 1, the water vapor in the air comes into contact with the cooler glass surface of the lid and condenses back into liquid water. Condensation is a physical change where a gas changes into a liquid.

Observation 2- Boiling is the process of converting liquid water into water vapor (gas) by absorbing heat energy. The heat causes water molecules to gain energy and transform into gas, forming bubbles that rise to the surface. This change involves the breaking of intermolecular forces between water molecules and is a chemical change.

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Answer:

The most stable conformation of the following compound has

A. An axial methyl group and an axial ethyl group.

B. An axial methyl group and an equatorial ethyl group.

C. An axial tert-butyl group.

D. An equatorial methyl group and an equatorial ethyl group.

E. An equatorial methyl group and an axial ethyl group.

Explanation:

The most stable conformation in the cyclohexane ring is the one in which both the substituents are in the equatorial position.

Among the given options,

option D  An equatorial methyl group and an equatorial ethyl group.

When the substituents in the cyclohexane ring are in equatorial positions then, the steric repulsions will be reduced.

Answer is option D.

The molecular formula of the compound is N₂H₄

we'll begin by calculating the number of mole of the unknown gas. This can be obtained as follow:

Volume (V) = 200 mL = 200 / 1000 = 0.2 L

Pressure (P) = 1.81 atm

Temperature (T) = 25 °C = 25 + 273 = 298 K

Gas constant (R) = 0.0821 atm.L/Kmol

PV = nRT

1.81 × 0.2 = n × 0.0821 × 298

0.362 = n × 24.4658

Divide both side by 24.4658

\(n \: = \frac{0.362}{24.4658} \)

mole of compound = 0.0148 mole

mass of compound = 0.473 g

\(molar \: mass \: = \frac{mass}{mole} \\ \\ molar \: mass \: = \frac{0.473}{0.0148} \\ \\ \)

Nitrogen (N) = 0.414 g

Hydrogen (H) = 0.0591 g

Divide by their molar mass

N = 0.414 / 14 = 0.0296

H = 0.0591 / 1 = 0.0591

Divide by the smallest

N = 0.0296 / 0.0296 = 1

H = 0.0591 / 0.0296 = 2

Therefore, the empirical formula of the compound is NH₂

Molar mass of compound = 31.96 g/mol

Empirical formula = NH₂

Molecular formula = Empirical formula × n = Molar mass

[NH₂]n = 31.96

[14 + (2×1)]n = 31.96

16n = 31.96

Divide both side by 16

n = 31.96 / 16

n = 2

Molecular formula = [NH₂]n

Molecular formula = [NH₂]₂

Thus, the molecular formula of the compound is N₂H₄

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Answer:

n = 0.21 moles

Explanation:

Given that,

Volume, V = 0.84 L

Pressure, P = 4.6 atm

T = 222 K

We need to find the number of moles of Neon gas. We know that,

PV = nRT

Where

n is the number of moles

R i the gas constant, R = 0.08206 L-atm/mol-K

Put all the values,

\(n=\dfrac{PV}{RT}\\\\n=\dfrac{4.6\times 0.84}{0.08206 \times 222}\\\\n=0.21\ \text{moles}\)

So, there are 0.21 moles of Neon gas.

Answer: unlike, will not scatter

Explanation:

Colloids are unlike solutions because their dispersed particles are much larger than those of a solution. The dispersed particles of a colloid cannot be separated by filtration, but they scatter light, a phenomenon called the Tyndall effect.

The amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

To find the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C, we can use the equation Q = mcAT.
First, we need to find the value of m, which is the mass of the water in grams. In this case, it is given as 200 grams.
Next, we need to find the value of AT, which is the change in temperature in degrees Celsius.

This can be calculated by subtracting the initial temperature from the final temperature, which gives us 60 C - 20 C = 40 C.
The specific heat capacity of water, C, is given as 4.18 Joules per gram per degree Celsius.
Now we can plug in the values into the equation:
Q = mcAT
Q = (200 g) x (4.18 J/g°C) x (40°C)
Q = 33,440 J
Therefore, the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

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Answer:

A

Explanation: