A pool is 37.1 m long and 40.5 m wide. if the average depth of water is 4.80 ft, what is the mass (in kg) of water in the pool? enter your answer in scientific notation.

Answer:The nucleus contains two types of subatomic particles,  

       protons and neutrons.

Explanation:The protons have a positive electrical charge and the neutrons have no electrical charge. A third type of subatomic particle, electrons, move around the nucleus.

C. kinetic energy to electrical energy.

In a beta emission, the mass number of the daughter nucleus remains unchanged while the atomic number of the daughter nucleus increases by one unit. The following are isotopes produced when the following undergo beta emission;

1) potassium-42  ------> Ca - 42

2) iodine-131 ------------> Xe - 131

3)  iron-52 ---------------> Co - 52

4)  sodium-24 -----------> Mg -24

The daughter nucleus formed after beta emission is found one place after its parent in the periodic table.

Regarding the stability of the daughter nuclei, a nucleus is unstable if the neutron-proton ratio is less than 1 or greater than 1.5.

Hence, the following daughter nuclei are stable; Ca - 42, Xe - 131, Mg -24.

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Answer:

B. Volcanoes

Explanation:

B. Volcanoes

Answer:

B:Volcanoes

Explanation:

because valley rift develops

Answer :  The acid ionization constant (Ka) for the given acid HA is 1.1 x 10^(-5), rounded to two significant figures.

To calculate the acid ionization constant (Ka) for the given acid HA, we must first find its pH using the given concentration of the solution. Then, we can use the pH to find the concentration of H+ ions in the solution. Finally, we can plug these values into the expression for Ka to solve for the acid ionization constant.

The pH of the 0.120 M solution of HA is given to be 3.28. This means that [H+] = 10^(-pH) = 10^(-3.28) = 5.01 x 10^(-4) M.
Now, we can use the expression for Ka: Ka = [H+][A-]/[HA],  Since HA is a weak acid, we can assume that it dissociates as follows: HA + H2O ⇌ H3O+ + A- This means that [A-] = [H3O+], and [HA] = initial concentration of the acid (0.120 M) - [H3O+].

Substituting these values, we get: Ka = (5.01 x 10^(-4) M)^2 / (0.120 M - 5.01 x 10^(-4) M) = 1.1 x 10^(-5). Therefore, the acid ionization constant (Ka) for the given acid HA is 1.1 x 10^(-5), rounded to two significant figures.

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Answer:

This equation is already balanced.

Explanation:

If your teacher requires that you put coefficients in front of each compound, then put a 1 in front of every compound.

The periodic table brings order to information about the chemical elements. The chemical elements are arranged in order of increasing atomic number. The horizontal rows are called periods and the vertical columns are called groups. Elements in the same group have similar chemical properties.

Answer:

It is used to represent whole numbers

Explanation:

Answer: Should be A)

Explanation:

the size of planets effects the amount of gravitational force each planet has, like jupiter, it has the most gravity.

The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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Option (B) closer to the end where HCl was introduced is correct because, according to Graham's Law of Diffusion, The Rate of diffusion is indirectly proportional to 1/√(Molar. mass).

The ammonium chloride (NH₄Cl) will form primarily in the middle of the glass tube, where the two gases (NH₃ and HCl) are first able to react with one another. This is because the gases travel through the tube at different velocities, so the reaction will occur where the gases first meet.

As the reaction progresses, the ammonium chloride will continue to form until the reaction is complete and the tube is filled with the solid product.

The reaction of the two gases is reversible, meaning that the NH₄Cl can also break down back into NH₃ and HCl. However, as the gases continue to travel through the tube, the reaction rate of the NH₄Cl breaking down is much slower than the rate at which it is formed.

Therefore, the majority of the ammonium chloride will form in the middle of the tube where HCl is introduced.

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The solution with the highest pH is the one with the lowest concentration of hydrogen ions (H+). In this case, the solution with the lowest concentration of H+ is 0.10 M HBrO4. Therefore, the solution with the highest pH is b. 0.10 M HBrO4.

pH is a measure of the concentration of hydrogen ions in a solution. The lower the pH, the higher the concentration of H+ ions, and the more acidic the solution. The higher the pH, the lower the concentration of H+ ions, and the more basic the solution.

In this case, all of the solutions have the same concentration (0.10 M), but they have different acids. The strength of an acid is determined by its ability to donate H+ ions. The stronger the acid, the more H+ ions it will donate, and the lower the pH of the solution.

The acid with the highest Ka value is the strongest acid, and will therefore have the lowest pH. The Ka values for the acids in this question are:

HBrO3: 2.0 x 10^-9
HBrO4: 1.0 x 10^-8
HClO3: 1.0 x 10^-8
HClO4: 1.0 x 10^-8

Based on these values, the strongest acid is HBrO4, which will have the lowest pH. Therefore, the solution with the highest pH is b. 0.10 M HBrO4.

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The mass of ether that can be put into a 130 mL beaker is approximately 92.3 grams.

To calculate the mass of ether that can be put into a 130 mL beaker, we need to know the density of ether.

The density of ether varies depending on the specific type of ether, but assuming you are referring to diethyl ether, the density is approximately 0.71 g/mL.

Using the density and the volume of the beaker, we can calculate the maximum mass of ether that can be put into the beaker as follows:

Mass of ether = Density x Volume

Mass of ether = 0.71 g/mL x 130 mL

Mass of ether = 92.3 grams

Therefore, the maximum mass of diethyl ether that can be put into a 130 mL beaker is approximately 92.3 grams.

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Answer:

A D F

Explanation:

Its right but its not in order But its A D and F

Answer:

answer in picture

Explanation:

The kinetic energy of the electron ejected is 4.53 x 10^-19 Joules, as Lithium has a work function of 2.90 eV. Light having a wavelength of 1850 Angstroms is shined on Li.

The formula for determining the kinetic energy of an ejected electron is as follows: K.E (max) = hν - φWhere:h = Planck’s constant = 6.63 x 10^-34 Jsν = frequency of the incident light, which can be calculated using the formula c/λ, where c is the speed of light and λ is the wavelengthφ = work function for the given question, we are given that the work function of Lithium is 2.90 eV.

The energy of the incident light can be calculated using E = hc/λ, where h is Planck's constant, c is the speed of light, and λ is the wavelength of the light. Converting the given wavelength of 1850 Angstroms to meters, we get:λ = 1850 x 10^-10 mE = hc/λE = (6.63 x 10^-34 J s) (3 x 10^8 m/s) / (1850 x 10^-10 m)E = 1.07 x 10^-18 JUsing the formula above, we can calculate the maximum kinetic energy of the ejected electron as follows: K.E (max) = hν - φK.E (max) = (6.63 x 10^-34 J s)(3 x 10^8 m/s) / (1850 x 10^-10 m) - 2.90 eVK.E (max) = 7.13 x 10^-19 J - 2.90 x 1.6 x 10^-19 JK.E (max) = 4.53 x 10^-19 JTherefore, the kinetic energy of the electron ejected is 4.53 x 10^-19 Joules.

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Regina conducted an investigation to determine whether earthworms add nutrients to soil. she used two pots of soil. she added three earthworms to the first pot. she did not add any earthworms to the second pot, which was the control. Regina tested the nutrient levels of the soil in both pots after two weeks. The type of investigation is Regina conducting is experimental.

Experimental study is a quantitative method of research which allows to visualize the effects of variable change by keeping other variables in control. These involve random experimental control.

There is an independent variable, a dependent variable and a set up which is meant for control in an experimental study. The control is to establish the validity of the experimental study.

Experiments creates the cause and effect relationship. This experiment was designed to know whether the earthworms add any nutrient to the soil.

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Answer:

\(density = \frac{mass}{volume} \\ \\ density = \frac{20.015}{5.44} \\ \\ { \boxed{ \boxed{density = 3.679 \: g {cm}^{ - 3} }}}\)

Answer:

6

Explanation:

2+2+2=6 :)

Answer:

6

Explanation:

vvvffhjh DC hcf vhcnbfhbc

Answer:

164.088 g/mol

Explanation: hope this helps

Answer:

Calcium nitrate

Explanation:

164.088 g/mol

give me the brainliest plss

Among the given options, NH3 (ammonia) can dissolve in water.

NH3 is a polar molecule, meaning it has a partial positive charge on the hydrogen atoms and a partial negative charge on the nitrogen atom. Water (H2O) is also a polar molecule, with the oxygen atom being partially negative and the hydrogen atoms partially positive.

BH3 (borane) is a nonpolar molecule. It does not possess a significant charge separation and does not readily form hydrogen bonds with water molecules. Therefore, BH3 is not expected to dissolve in water to a significant extent.

Therefore, NH3 (ammonia) can dissolve in water, while BH3 (borane) does not readily dissolve in water.

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Answer:

yes

Explanation:

yes they're very common.

Hello. You have not presented the image that presents the two elements mentioned in the question. This makes it impossible for your question to be answered. However, I will try to help you as best I can.

To say whether the compounds obey the law of multiple proportions, you should observe whether one of the elements, formed from the compounds, maintains a fixed mass, while the other element presents the mass in a varied amount of small, whole numbers, spread across the formed compounds .

This is because the law of multiple proportions states that an element must have a fixed mass when reacting with another element to create compounds. This reaction will allow this element to keep the mass fixed, while the other element will generate different compounds, where each one presents a part of the mass of the forming element, in small and whole numbers.

Answer:

31.6%

Explanation:

find the molecular formular

(52×2)+(16×3)=152

since the %of oxygen is required

MF of o in Cr2O3 =16×3=48

%O= 48/152×100= 31.6%

The pH of the sol-gel solution plays a crucial role in determining the size and shape of the silica nanoparticles produced during the freeze drying assisted sol-gel process.

The pH of the solution used in the freeze drying assisted sol-gel process can have an influence on the spherical shape and particle size of silica nanoparticles (SNPs). When the pH is adjusted, it affects the hydrolysis and condensation reactions that occur during the sol-gel process. This, in turn, can impact the formation and growth of the silica nanoparticles.

In general, at higher pH values, the hydrolysis reaction is favored, leading to the formation of larger silica particles. On the other hand, at lower pH values, the condensation reaction is favored, resulting in the formation of smaller particles.

Furthermore, the pH also influences the surface charge of the SNPs, which can affect their stability and aggregation behavior. At specific pH values, the surface charge can be neutralized, leading to particle aggregation.

Overall, the pH of the sol-gel solution plays a crucial role in determining the size and shape of the silica nanoparticles produced during the freeze drying assisted sol-gel process.

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The given statement ," Greenhouse gases affect the temperature of the earth by blocking sunlight from reaching the earth" is true.

Generally the greenhouse effect is defined as a process that occurs when gases in Earth's atmosphere usually trap the Sun's heat. The process of greenhouse gases makes Earth much warmer than it would be without an atmosphere. Basically greenhouse effect is one of the things that makes our Earth a comfortable place to live.

Generally greenhouse gases are also known as GHGs are gases in the earth's atmosphere that trap heat. Basically, during the day time, the sun shines through the atmosphere, warming the earth's surface. During the night time the earth's surface cools, releasing heat back into the air.

Hence, the given statement is true.

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The temperature at which the equilibrium constant for the given reaction is equal to 2.6.

To find the temperature at which the equilibrium constant for the reaction 2 NO2(g) ⇌ N2O4(g) is equal to 2.6, you can use the van't Hoff equation:ln(K2/K1) = -(ΔH/R) × (1/T2 - 1/T1)Where K1 and K2 are the equilibrium constants at temperatures T1 and T2, respectively, ΔH is the enthalpy change of the reaction, and R is the gas constant (8.314 J/mol·K).Given: K1 = 8.8 at T1 = 298 K, K2 = 2.6 (the desired equilibrium constant), and ΔH = -57.2 kJ/mol.First, convert ΔH to J/mol: ΔH = -57,200 J/mol.

Now, you can plug the values into the van't Hoff equation:ln(2.6/8.8) = -(-57,200 J/mol) × (1/T2 - 1/298 K) / (8.314 J/mol·KAfter solving for T2, you will find the temperature at which the equilibrium constant for the given reaction is equal to 2.6.

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Answer:

The answer is compound because they consist of multiple things.

Answer: D. 4

Explanation:

For numbers with decimal point, we should start counting from the first number that non-zero from the left.

0.0001372

We start counting from 1, since it is the first non-zero number

1, 3, 7, 2

There are in total 4 significant figures

Hope this helps!! :)

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