a student performs an experiment where gas is collected over water in an upside down graduated cylinder. if the atmospheric pressure is 739 mmhg and the level of water in the graduated cylinder is 12.5 cm higher than the level of the water exposed to the atmosphere, what is the total pressure of gases inside the graduated cylinder?

The amount of salt in the tank as a function of time is f(t) = 70 + 4t, where f(t) is the amount of salt in the tank after t minutes.

The rate of salt entering the tank is 2 lb/gal x 2 gal/min = <<2*2=4>>4 lb/min, where the concentration of salt is 2 lb/gal. Initially, the tank contains 70 lb of salt and 280 gal of water. When the brine flows into the tank at a constant rate of 2 gal/min, the concentration of salt in the tank remains constant. When the tank is stirred, the salt will be uniformly distributed throughout the mixture. Let’s assume that t is the time in minutes. As a result, the number of minutes that the solution is in the tank will be t. Since the concentration of salt in the tank remains constant, the amount of salt in the tank after t minutes is 70 lb + 4 lb/min × t.

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Answer:

Explanation:

An element with atomic number 18 is a noble gas.

The element with atomic number 19 will have one extra electron so it can donate one electron or shed one electron to attain noble gas configuration .

It tends to shed one electron to become positively charged ion . Hence they are electro-positive elements .  

Similarly the element with atomic number 17 will have one short  electron so it can gain  one electron  to attain noble gas configuration .

They  tend to gain  one electron to become negatively charged ion . Hence they are electro-negative  elements . They have high  electronegativity .

Answer:

numbers of molecules = 3×6.023×10-23

The cell potential is 0.94 V.

To find the cell potential of the given cell, we can use the standard reduction potentials from a table.

The half-reactions are:

\(Ag^+ + e^- → Ag E° = +0.80 V\)

\(Sn^2^+ + 2e^- → Sn E° = -0.14 V\)

The overall cell potential (Ecell) can be calculated as sown below.

Ecell = E°cathode - E°anode

Ecell = (+0.80 V) - (-0.14 V)

Ecell = +0.94 V

Therefore, the cell potential of the given cell is +0.94 V.

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The products of mild hydrolysis of lipids with dilute NaOH are glycerol and fatty acids.

Glycerol: Lipids are esters of fatty acids and glycerol. During hydrolysis, the ester bonds between the fatty acids and glycerol are broken, resulting in the release of glycerol.

Fatty acids: The other product of hydrolysis is the release of fatty acids. Each lipid molecule contains one or more fatty acid chains attached to the glycerol backbone. These fatty acid chains are liberated as individual molecules during hydrolysis.

Therefore, glycerol and fatty are the products of mild hydrolysis of lipids with dilute NaOH.

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The new concentration of the KCl solution after mixing 1 L new volume is 0.28 M.

Concentration in terms of molarity will be calculated by using the below equation as:

M₁V₁ = M₂V₂, where

M₁ = molarity of old KCl solution = 1.6 M

V₁ = volume of old KCl solution = 175 mL = 0.175 L

M₂ = molarity of new KCl solution = ?

V₂ = volume of new KCl solution = 1 L

On putting all these values on the above equation, we get

M₂ = (1.6)(0.175) / (1) = 0.28 M

Hence resultant concentration is 0.28 M.

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Answer:

29.25g

Explanation:

Number of moles = Mass / Molar mass

Number of moles of NaOH = 20g/(23 + 16 + 1)

= 0.5mol

1 mol of NaOH = 1 mol of NaCl

Therefore, 0.5mol of NaOH = 0.5mol of NaCl

0.5mol = Mass of NaCl / (23 + 35.5)

Mass = 0.5 × 58.5

= 29.25g

I hope this helps! ^^

Explanation:

Hello mr/mrs (name) I unfortunately couldn't pay attention to the class due to some issues I had therefore I don't know what we are doing in class

OR

Hello mr/mrs (name) I could understand what we were doing in class I would like it if you could break it down more or explain better to me

OR just say something it had something to do with your internet such as

Hello mr/mrs (name) I didn't understand what you were saying during our class due to some of my internet issues I was have throughout the day. I hope you can explain what we did during the class.

Those may be some of my excuses I've used before

they have worked for me:)

I don't know if that helped?:/

Answer:

Her speed is 6.8m/s.

Explanation:

K.E= 1/2mv²

or, 2543.2= 1/2×110×v²

or, 2543.2 = 55v²

or, 2543.2/55 = v²

or, 46.24 = v²

or, 6.8² = v²

v = 6.8 m/s

answer

6.8

explanation

k.e=1/2v^2

2543.2=55v^2

46.24=v^2

6.8^2=v^2

v=6.8

Answer:

acting together to break down rocks and minerals to form soil.

Explanation:

There are a whole range of weathering processes at work near the surface of the soil, acting together to break down rocks and minerals to form soil. ... As rocks and sediments are eroded away, so more of the solid rock beneath becomes vulnerable in turn to weathering and breakdown.

Answer:

Diffusion and Dispersion.

Explanation:

The two processes that took place in the given experiment are Diffusion and Dispersion.

When a crystal of potassium magnet is added placed in the bottom of a beaker which contains cold water, after 5 minutes the particles of potassium magnet will diffuse with water through diffusion process and the colour of water turns purple.

After few hours, the colour of solution goes light purple because the tiny particles which were diffused earlier will dispersed in the water and the particles will spread and make the solution lighter in colour.

Hence, the two processes are Diffusion and Dispersion.

Answer:

Thermal energy is taken from heat sink in higher temperature. A thermal power machine does mechanical energy using part of the heat.

Part of heat taken are given in cold reservoir in lower temperature

Explanation:

Wavelength (L) is calculated using: L = gT²/2π, here g=9.8 m/s2 and T is wave period in seconds.

Wavelength of a wave describes how long the wave is and the distance from the "crest" (top) of one wave to the crest of next wave is called wavelength. We can also measure from the "trough" (bottom) of one wave to trough of next wave and get the same value for the wavelength.

We measure wavelength in following ways:

Use photometer to measure the energy of wave.

Convert energy into joules (J).

Divide energy by Planck's constant, 6.626 x 10⁻³⁴, to get the frequency of  wave.

Divide speed of light, ~300,000,000 m/s, by frequency to get wavelength.

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Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Answer:

Mass = 12.12 g

Explanation:

Given data:

Mass of CH₄ = 48 g

Mass of H₂ produced = ?

Solution:

Chemical equation:

CH₄ →   C + 2H₂

Number of moles of CH₄:

Number of moles = mass/molar mass

Number of moles = 48 g/ 16 g/mol

Number of moles = 3 mol

Now we will compare the moles of CH₄  and H₂.

               CH₄          :           H₂

                  1             :           2

                  3            :          2/1×3 = 6 mol

Mass of  H₂:

Mass = number of moles × molar mass

Mass = 6 mol × 2.02 g/mol

Mass = 12.12 g

Answer:

The validation of seafloor spreading in the 1950s and 60s

Explanation:

The theory of seafloor spreading was supported by numerous evidence including thermal probes that showed that heat flow over the mid-ocean ridges measured up to four times those measured in general bottom sediments, which are taken as due to the presence of molten Earth material close to the ridge crest

The ridge crest also show signs unusually seismic wave velocities that are considered to be due to microfracturing and thermal expansion from upwelling magma

Answer:

v=50km/hr

Explanation:

Given:

s= 300km

t= 6 hours

Required:

v=?

Formula:

v=s/t

Solution:

v=s/t

v=300km/6h

v=50km/hr

Hope this helps ;) ❤❤❤

Answer:

products

Explanation:

when chemicals react new substances are created called PRODUCTS

Answer:

the _products_ are new substances that are created by following a chemical reaction.

Explanation:

^^

The value of the equilibrium constant for the reaction O2 + 4NO2 ⇌ 2 N2O5 at 25°C  is (95)¹/².

The given reaction is:

                            N2O5 ⇌ 2NO2 + (1/2) O2

The given equilibrium constant for the reaction at 25°C is 95.

Now, consider the reaction

                 O2 + 4NO2 ⇌ 2N2O5

Let's take the reciprocal of the equilibrium constant for the given reaction:

N2O5 ⇌ 2NO2 + (1/2) O2

Kp = 1/Kc

∴ 1/95 = Kp

The equation for the reaction

          O2 + 4NO2 ⇌ 2N2O5

can be represented as the sum of the equation for the given reaction and its reverse:

                   N2O5 ⇌ 2NO2 + (1/2) O2...(1)

Reverse of equation (1)

                           2NO2 + (1/2) O2 ⇌ N2O5... (2)

Now, multiply equation (1) by 2 and add it with equation (2).

               2N2O5 ⇌ 2NO2 + O2...(3)

Now, write the equilibrium constant expression for equation (3):

Kp' = PNO2² . PO2 / PN2O5²

We know that:

PNO2² / PN2O5² = 1/Kp (from equation (1))

∴ Kp' = PO2 / Kp

       = Kp/PO2

∴ Kp' = 95 / P(1/2)O2

Since the given temperature is 25°C, the partial pressure of oxygen is taken as 0.25 atm at standard temperature and pressure.

Now, substitute the given values in the above equation:

Kp' = 95/0.25

      = 380

Therefore, the value of the equilibrium constant for the reaction O2 + 4NO2 ⇌ 2N2O5 is (95)¹/² at 25°C.

Thus, option C is correct. Conclusion: The value of the equilibrium constant for the reaction O2 + 4NO2 ⇌ 2N2O5 is (95)¹/² at 25°C.

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Answer:

Intramolecular

The follow up answer for "The two strands of a DNA molecule are separate molecules that are held together by weak electrostatic attractions." is Intermolecular.

The next answer is Intermolecular

The scenario describes intramolecular forces.

Intramolecular forces are the forces that keep atoms together inside a molecule. Intermolecular forces are forces that exist among molecules. determine intermolecular appeal between H-Cl molecules and intramolecular attraction within H-Cl molecules.

The most powerful intermolecular forces are dipole-dipole interactions. A dipole-dipole pressure is while the high-quality aspect of a polar molecule draws the bad facet of every other polar molecule.

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Answer:

commonly used

kilograms per cubic meter(kg/m³) and

grams per cubic centimeter(g/cm³)

Explanation:

hope it helps you

Answer:

148 g H₂SO₄

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

RxN:   Ca(OH)₂ + H₂SO₄ → CaSO₄ + H₂O

Given:   3.01 moles H₂O

Step 2: Balance RxN

Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O

Step 3: Define conversions

Molar Mass of H - 1.01 g/mol

Molar Mass of S - 32.07 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂SO₄ - 2(1.01) + 32.07 + 4(16.00) = 98.09 g/mol

Step 4: Stoichiometry

\(3.01 \ mol \ H_2O(\frac{1 \ mol \ H_2SO_4}{2 \ mol \ H_2O} )(\frac{98.09 \ g \ H_2SO_4}{1 \ mol \ H_2SO_4} )\) = 147.625 g H₂SO₄

Step 5: Check

We are given 3 sig figs. Follow sig fig rules.

147.625 g H₂SO₄ ≈ 148 g H₂SO₄

A neutralization reaction between an acid and a metal hydroxide typically produces water and a salt. So, the answer to your question is b.

The formation of hydrogen gas or oxygen gas is not a common outcome of neutralization reactions, and sodium hydroxide is not a product of neutralization between an acid and a metal hydroxide.
                                        The products of a neutralization reaction between an acid and a metal hydroxide. A neutralization reaction between an acid and a metal hydroxide produces water and a salt (Option b). This is because the hydrogen ion (H+) from the acid reacts with the hydroxide ion (OH-) from the metal hydroxide to form water (H2O), while the remaining cation from the metal hydroxide and the anion from the acid combine to form a salt.

                                     Therefore, option b is the most appropriate answer to your question. It is essential to note that the type of salt produced depends on the acid and the metal hydroxide used in the reaction.

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Answer:

2

Explanation:

I'm not that sure plz tell me if this is right

Answer: 98.08 g/mol

:))))))))

Answer:

Ammonia and oxygen without catalyst | NH3 + O2 → N2 + H2O. With supply of heat, ammonia reacts with oxygen and produce nitrogen gas and water as products. Nitrogen of ammonia is oxidized to nitrogen gas from -3 oxidation state to 0 oxidation state.

Explanation:

40 Ne has 10 electrons which consist of 10 protons and 10 neutrons

Neon is a chemical element which is rare gas or noble gas as it has a stable octet electronic configuration, meaning it has 8 valence electrons in its outermost shell.

Neon belongs to group 0/VIII and period 1 of the periodic table.

An element is a substance which takes part in a chemical reaction. There are different classes of elements which includes the metals, nonmetals and the metalloids.

So therefore, 40 Ne has 10 electrons which consist of 10 protons and 10 neutrons.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities 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 we have

\(n = \frac{4.5 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 7.47508...\)

We have the final answer as

Hope this helps you