Calculate the molarity of a salt solution containing 0.36 mol of NaCl in total volume of 134 mL.
(M = mol
solute/L solution)

4.41 × 10⁻⁴⁵m is the wavelength of the photon and the energy correspond to red color.

The term wavelength is defined as the distance between two identical points that are adjacent crests and troughs.

The SI unit of wavelength is metre mostly represented as m.

The wavelength is mostly represented by λ is the Greek letter lambda.

Given:

E =  4.50x10⁻¹⁹ J/photon

h = Planck constant = 6.626 × 10⁻³⁴

ν = ?

E = hν

ν = E/h

By substituting the values in above question and we get,

= 4.50x10^-19 /  6.626 × 10⁻³⁴

=  0.679 × 10⁻¹⁵

c = 3 × 10⁸

E = hc/λ

λ = hc/E

By substituting the values in above question and we get,

λ = 6.626 × 10⁻³⁴ ×  3 × 10⁸ / 4.50x10⁻¹⁹

λ = 4.41 × 10⁻⁴⁵m

Thus, the wavelength of the photon is 4.41 × 10⁻⁴⁵m and color does this energy correspond to red.

To learn more about the wavelength, follow the link;

https://brainly.com/question/13533093

#SPJ9

Answer:

(C) when bonds in food are broken, energy is released

The number of moles of excess reactant is used in the experiment is 0.33 moles. The number of moles of aluminium sulphates was obtained  0.129 moles if the percentage yield is 77%.

2Al(OH)3(aq) + 3H2SO4(aq) -----> Al2(SO4)3(aq) + 6H2O(l)

Number of moles of Al(OH)3 = 0.500 mol

Number of moles of H2SO4 = 0.500 mol

We have to determine the limiting reactant as follows;

2 moles of Al(OH)3 reacts with 3 moles of H2SO4

0.500 moles of  Al(OH)3 reacts with 0.500 moles ×  3 moles/2 moles

= 0.75 moles of H2SO4.

This means that H2SO4 is limiting reactant

Since  3 moles of H2SO4 reacts with 2 moles of Al(OH)3

0.500 moles of  H2SO4 reacts with  0.500 × 2 moles /3 moles

= 0.33 moles

Only  0.33 moles of excess reactant was used in the experiment.

3 moles of  H2SO4 yields 1 mole of  Al2(SO4)3

0.500 moles of  H2SO4 yields  0.500 moles ×  1 mole/3 moles = 0.167 moles

Theoretical yield of Al2(SO4)3 = 0.167 moles

% yield = actual yield/Theoretical yield × 100/1

Actual yield = % yield × Theoretical yield /100

Actual yield =  77 ×  0.167/100

Actual yield = 0.129 moles

Learn more: https://brainly.com/question/11155928

Answer:

The symbol of each element is, Ne, Na, Mg, and Al.

Explanation:

Below is the list of elements that has an atomic mass of less than 19.3 u.

The atomic mass of Neon is 20.1797 u and the atomic number is 10.

The atomic mass of Sodium is 22.989769 u and the atomic number is 11.

The atomic mass of Magnesium is 24.305 u and the atomic number is 12.

The atomic mass of Aluminium is 26.981539 u and the atomic number is 13.

Here, the symbol of each element is, Ne, Na, Mg, and Al.

Answer:

I think the answer is B. Carbon atom but I'm not 100% sure. Sorry if it's incorrect.

Answer:

a measure of the suitability of water for a particular use based on selected physical, chemical, and biological characteristics.

Water quality is a parameter to qualify based on several key factors. Some of these factors are:

• Conceptration of dissolved oxygen;

• Bacteria levels;

• Amount of salt (salinity);

• Amount of material suspended in the water (turbidity).

Other elements that might be measured to determine water quality are:

• Concentration of algae;

• Pesticides;

• Herbicides;

• Heavy metals.

Answer: 4

Explanation: because the zero doesn't count

Answer:

D H2PO4– + HPO42–

Explanation:

The acid dissociation constant for \(\mathbf{H_3PO_4 , H_2PO^{-}_4 , HPO_4^{2-}}\) are \(\mathbf{7\times 10^{-3}, \ \ 8\times 10^{-8} ,\ \ 5\times 10^{-13}}\) respectively.

\(\mathbf{pka (H_3PO_4) = -log (7\times 10^{-3} )=2.2}\)

\(\mathbf{pka (H_2PO_4^-) = -log (8\times 10^{-8} )=7.1}\)

\(\mathbf{pka (HPO_4^{2-}) = -log (5\times 10^{-13} )=12.3}\)

The reason while option D is the best answer is that, the value of pKa for both

\(\mathbf{H_2PO^{-}_4 ,\ \& \ HPO_4^{2-}}\) lies on either side of the desired pH of the buffer. This implies that one is slightly over and the other is slightly under.

Using Henderson-Hasselbach equation:

\(\mathbf{pH = pKa + log \Big( \dfrac{HPO_4^{2-}}{H_2PO_4^-} \Big)}\)

The compounds that are used for the formulation of the pH 9 buffer are \(\rm H_2PO_4^-\;and\;HPO_4^+\). Thus, option D is correct.

The buffers are the solutions of acids and base of appropriate pH, that are able to limit the change in pH in the reaction mixture.

The buffer pH is adjusted with the compounds that has been able to add base or acid to the solution.

For the formulation of buffer of specific pH, the acid and base solutions are required.

The compounds that are used for the formulation of the pH 9 buffer are \(\rm H_2PO_4^-\;and\;HPO_4^+\), as they are able to provide acid and base to the solution.

Thus, option D is correct.

Learn more about buffers, here:

https://brainly.com/question/1423164

The gradient of a graph shows the slope or rate of change. The graph here shows the relationship between the volume (V) and the absolute temperature (T) of a gas when the gas is kept at a constant pressure.

PV = nRT,

where

P is the pressure,

V is the volume,

n is the number of moles of the gas,

R is the ideal gas constant, and

T is the absolute temperature, the formula for the ideal gas law.

The ideal gas law can be rewritten as V = (nR/P)*T if pressure (P) is constant, volume (V) is plotted on the y-axis, and absolute temperature (T) is is plotted on the x-axis. Axis.

We can see that the gradient (m) of the graph in this equation represents (nr/p) by comparing it to the equation for a straight line, y = mx + c, where y is the dependent variable (V), x is the independent variable. variable (T), m is the gradient, and c is the y-intercept.

So, the correct option is B.

Learn more about ideal gas law, here:

https://brainly.com/question/1409639

#SPJ1

Answer:

Because of the artificial lights influencing the dark night, turning it into a grey.

They has been an occurrence of rainstorms in galetown.

This is simply when a downpour lasts for any length of time, it usually consists of short bursts of heavy rain interspersed with sporadic periods of lighter rain.

As the temperature rises, more ocean water evaporation occurs, releasing energy as well as water vapor into the atmosphere. The additional water vapor causes more rain and snow to fall. Intense downpours are likely to occur in areas that frequently rain. However, dry places are probably going to get even drier.

learn more about rainstorm here:

brainly.com/question/28635776

#SPJ1

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

For more question on atom

https://brainly.com/question/26952570

#SPJ8

Answer:

It will take 19.9 hours to fill the cubic.

Explanation:

First, we can find the volume of the cubic.

\(V_{c}=18.7^{3}ft^{3}=6539.2 ft^{3}=1.85*10^{8} ml\)

Let's multiple this volume times the density

\(V_{c}*\rho=1.85*10^{8} ml * 1.49 g/ml = 2.76*10^{8} g\)

If we divide the spilling rate by V times density we will have:

\(t=\frac{V_{c}}{\rho R}=2.76*10^{5} kg/3.85kg/s=71688.3 s = 19.9 h\)

Therefore, it will take 19.9 hours to fill the cubic.

I hope it helps you!            

The study of chemicals and bonds is called chemistry. when the amount reactant and the product is equal is said to be equilibrium.

The correct answer is 19.9h.

The formula used to solve the question is as follows:-

\(D= \frac{M}{V}\)

The data is given as follows:-

The density of the is as follows:-

\(V*D =1.85*10^8 *1.49 =2.76*10^8\)

Hence, the time will be as follows:-

\(t=\frac{V_c}{Dr}\\ \\=\frac{2.76*10^5}{3.85} \\ = 71688.3s\\=19.9h\)

Hence, the correct time is 19.9h.

For more information about the density, refer to the link:-

https://brainly.com/question/1255220

Answer:

D

Explanation:

The pineal gland regulates salt and water levels.

The pineal gland does not regulate salt and water levels. Therefore, option (D) is correct.

The pineal gland can be described as a pinecone-shaped small gland located in the middle of the human brain. The pineal gland is the main site for melatonin secretion, which regulates the internal clock of the body.

The dimensions of the pineal gland can be described as about 0.3 inches long and weighing 0.1 grams. The pineal gland is made of pinealocytes and supporting cells that are similar to the astrocytes in the brain.

The pineal gland secretes the hormone melatonin and this hormone regulates the circadian rhythm of the body and also reproductive hormones. The secretion of hormones depends upon the quantity of light a person is exposed to.

This hormone is formed in huge amounts when it is dark. The presence of light prevents the secretion of melatonin which controls circadian rhythms.

Learn more about the pineal gland, here:

https://brainly.com/question/13061431

#SPJ2

The right brain part of the brain is affected by a smell, a song, or a photograph.

The right brain is more intuitive and visually oriented. It is occasionally referred to as the analog brain. It thinks less logically and with more creativity. According to out-of-date research by Sperry, the right brain aids in creativity.

Posterior parietal cortex of the parietal lobe of the brain mainly deals with the photographs.

The olfactory bulb, a structure in the front of the brain, processes smells before sending data to other regions of the body's central nervous system.

To know more about smelling part of brain visit

https://brainly.com/question/3655509

#SPJ1

The right brain part of the brain is affected by a smell, a song, or a photograph.

What is Right Brain?

The right brain is more intuitive and visually oriented. It is occasionally referred to as the analog brain. It thinks less logically and with more creativity. According to out-of-date research by Sperry, the right brain aids in creativity.

Which part of brain deals with photograph?

Posterior parietal cortex of the parietal lobe of the brain mainly deals with the photographs.

Which part of brain deals with Smell?

The olfactory bulb, a structure in the front of the brain, processes smells before sending data to other regions of the body's central nervous system.

The enthalpy change of the reaction C(diamond) → C(graphite) is -2.9 kJ.

The given information is ΔHrxn for the reaction C(diamond) → C(graphite) can be calculated with the given equations:Equations:  C(diamond) + O2(g) → CO2(g) ΔH = −395.4 kJ  2 CO2(g) → 2 CO(g) + O2(g) ΔH = 566.0 kJ  C(graphite) + O2(g) → CO2(g) ΔH = −393.5 kJ  2 CO(g) → C(graphite) + CO2(g) ΔH = −172.5 kJThe required reaction can be obtained by adding the equations (1) and (4), as follows:C(diamond) + O2(g) + 2CO(g) → C(graphite) + 3CO2(g)Addition of the two equations (1) and (4) results in a reaction whose products are C(graphite) and CO2.

To get the final equation that involves only the required reactants and products, the equation (2) should be added, which consumes CO2 and produces O2, as shown below:C(diamond) + O2(g) → CO2(g)  ΔH = −395.4 kJ [eq. (1)]  2 CO(g) → C(graphite) + CO2(g)  ΔH = −172.5 kJ [eq. (4)]  2 CO2(g) → 2 CO(g) + O2(g)  ΔH = 566.0 kJ [eq. (2)]  C(diamond) + O2(g) + 2CO(g) → C(graphite) + 3CO2(g)  ΔHrxn=ΣΔHf(products)−ΣΔHf(reactants)  ΔHrxn=[(3 mol CO2)(-393.5 kJ/mol) + (1 mol C(graphite))(0 kJ/mol)] − [(1 mol C(diamond))(0 kJ/mol) + (1 mol O2)(0 kJ/mol) + (2 mol CO(g))(−172.5 kJ/mol)] − [(2 mol CO2)(566.0 kJ/mol)]  ΔHrxn=−2.9 kJ.

for such more questions on reaction

https://brainly.com/question/11231920

#SPJ8

Answer:

The correct answer is - 0.570 grams

Explanation:

The balanced chemical reaction is given by

Cu(NO3)2(aq)     + 2NaOH(aq)    -------->    Cu(OH)2(s)      + 2NaNO3(aq)

        1.0 mole            2.0 mole                 1.0 mole          2.0 mole

number of mol of Cu(OH)2,

n = Molarity * Volume

= \(35.0*0.167 = 5.845\) millimoles

As clear in the equation, 1 mole of Cu(NO3)2 gives 1 mole of Cu(OH)2 , So, 5.845 millimoles of Cu(NO3)2 will produce 5.845 millimoles of Cu(OH)2

Mass of Cu(OH)2 = number of mol * molar mass

= \(97.5*5.845*10^-3\)

= 0.570 grams

Thus, the correct answer is - 0.570 grams

Answer: Understanding oxidation-reduction reactions

Explanation:

Rusting occurs when electrons are exchanged between iron and oxygen.

Answer:

Force F = 20N .

Mass m = 2.0 kg

Initial velocity u = 0

acceleration, a = 10m/s  

2

t = 1 sec.

Now Refer to the attachment, See the free body diagram of the block.

Force works on the block:-

Weight, W = mg

W = 2 × 10

W = 20N (which is Downward)  

Normal force N = mg cos37

N = 20 × 0.80  

N = 16 N. (perpendicular & upward to the plane )

Here Applied Force, P = 20N (which is down along the plane)

Now For Final Speed, We know the formula:-

v = u + at

v = 0 + 10 × 1

v = 10 m/s

the Distance travelled s = ut + 0.5 at×t

s = 0 + 0.5 ×10×1×1

s = 5 m.

Now,

(a)     So work done by the force of gravity in 1 sec. = F × d

             ⇒20 N × 5m      

             ⇒100 J.

(b) Here the weight act as downward, so distance travelled in downward.

             ⇒5 × sin37

             ⇒5 × 0.6  

             ⇒3 m.

so work done by gravity,

               ⇒20 N × 3 m

              ⇒60 J.

(c) Now, work done by all the forces  

               ⇒change in Kinetic energy

  ⇒

2

1  m(v2

−u  2

)

⇒0.5×2.0×(10  2

−0  2  )

⇒ 100 J.

⇒W.D by frictional force  

                 = work was done by all forces -( work was done by Normal force + work done by applied force + work done by gravity )  

                 = 100 J - (100 + 60 +0 )

                 = 100 - 1

     Hope this helps you≅        

Answer:

\(\frac{40}{18}Ar => \frac{40}{17}Cl + \frac{0}{1}e\\\)

Explanation:

The process of positron emission is better understood by the following reaction:

Positron emission may be defined as a subordinate type of radioactive decay called which is effectively known as beta decay. Due to this emission, a proton that is present inside a radionuclide nucleus significantly transformed into a neutron while liberating a positron and an electron neutrino.

According to the context of this question, Argon-40 undergoes the process of beta decay. Through which X element is formed which is known as chlorine. The atomic number (Z) of chlorine is 17, while the atomic mass (A) is 40 which is as identical to argon.

Therefore, the appropriate values for A and Z and the chemical symbol for X are 40 and 17 respectively.

To learn more about Positron emission, refer to the link:

https://brainly.com/question/4598666

#SPJ2

13.8 g of magnesium chloride is equal to 8.73 x 10 22 formula units ( MgCl2 ). chlorhydrate of magnesium. a two-chloride ion and one magnesium-based inorganic molecule.

This drug is a mineral supplement used to prevent and cure low levels of magnesium in the blood. Certain brands are also used to treat symptoms of too much stomach acid, including indigestion, heartburn, and stomach discomfort.

Chloride of magnesium

It serves as a crucial coagulant in the production of tofu, soy, drinks, and infant formula milk. Magnesium chloride is also employed in the brewing of beer as a taste ingredient and in food coloring.

MgCl2 mass = 13.8 g

Molar mass of MgCl2 = 95.2 g/mol

Number of moles of MgCl2 = ( mass of MgCl2 / Molar mass of MgCl2)

           = ( 13.8g ) / ( 95.2g/mol) = 0.14496 mol

Number of MgCl2 moleucles ( or number of formula units) = Moles of MgCl2 x avagadro number

                       = 0.14496 mol x 6.022 x 10^ 23

                   = 8.73 x 10^ 22

To know more about magnesium chloride visit:

https://brainly.com/question/30671024

#SPJ1

Answer:

The answer is C or 3 which ever but it that one

Explanation:

Answer: 33.3 moles

Explanation: 67.2 g H2 = 67.2/2.016 = 33.3 moles

The pumpkin seeds have to wrap in the towel and wet the towel slightly then place it in a warm place. The pH condition should be about neutral.

The seed germination of every plants need optimum sunlight and temperature. As well they must be provide with wet condition if requires. The optimum temperature for pumpkin seed germination is 15 -16 degree Celsius.

High humidity and high temperature are reported to be good condition for pumpkin seed germination. Hence, the air must not be too dry.

First wrap the seeds in a sand paper towel and soak the seeds in warm water for 2- 3 hours. 6 inch peat pot is generally used to plant the seeds. And do not place them in very deeper soil moisture.

Find more on seed germination:

https://brainly.com/question/29093380

#SPJ1

Answer:

I can say that knowledge of separating mixtures can help us in daily life and within society in the following ways:

1. Purification of water: Separation techniques are used to purify water for drinking and industrial purposes. It is essential to remove impurities from water to prevent diseases.

2. Recycling: Separation techniques are used to separate materials for recycling. This helps reduce the amount of waste in landfills and helps conserve resources.

3. Food industry: Separation techniques are used in the food industry to separate unwanted particles from food products. This helps ensure that the food we eat is safe and free from contaminants.

4. Medicine: Separation techniques are used in the pharmaceutical industry to separate and purify chemicals for use in medicine. This helps ensure that medicines are safe and effective.

5. Environmental protection: Separation techniques are used to remove pollutants from the environment. This helps protect our natural resources and prevent pollution-related health problems.

6. Oil and gas industry: Separation techniques are used to separate crude oil and natural gas into their various components. This helps in the production of energy and other useful products.

In summary, knowledge of separating mixtures is essential in our daily lives and within society. It helps ensure that we have access to safe and clean water, food, medicine, and energy, and also helps protect the environment.

Explanation:

Answer:

a. chemical change

Explanation:

A chemical change can cause an odor, however a physical change cannot, and the use of thermal energy will only make an object colder, not give it an odor.