What is the temperature change that 725 g of aluminum will undergo when 2.35 x 104
J of thermal energy are added to it?

The pH of the solution resulting from mixing 25.0 mL of 0.300 M NH₃ and 50.0 mL of 0.100 M HNO₃ is approximately 4.83.


To find the pH of the solution, we need to determine if the resulting solution is acidic, basic, or neutral. Given that NH₃  is a weak base and HNO₃ is a strong acid, the NH₃  will act as the base and the HNO₃  will act as the acid.

First, we need to calculate the number of moles of NH₃  and HNO₃  that are present in the solution.

For NH₃ :
moles of NH₃  = volume of NH3 (L) × concentration of NH3 (mol/L)
moles of NH₃  = 0.025 L × 0.300 mol/L
moles of NH₃  = 0.0075 mol

Next, we need to determine which species will be present in excess. Since NH₃  has a higher number of moles, it will be the limiting reagent.

The reaction between NH₃  and HNO₃  will result in the formation of NH4+ and NO3-. The NH4+ will determine the pH of the solution.

To calculate the concentration of NH4+ in the solution, we need to determine the concentration of  that reacted with HNO₃ . This can be done by subtracting the moles of  that reacted from the total moles .

moles of NH3 remaining = moles of NH3 initially - moles of NH3 reacted
moles of NH3 remaining = 0.0075 mol - 0.005 mol
moles of NH3 remaining = 0.0025 mol


Therefore, the pH of the solution resulting from mixing 25.0 mL of 0.300 M NH3 and 50.0 mL of 0.100 M HNO3 is approximately 4.83.

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One grain of calcium carbonate, or 64.8 milligrams, is dissolved in one US gallon of water to represent one grain per gallon (gpg), a measure of water hardness (3.785412 L).

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The list that  only includes terms that describe Cesium (Cs) is option (b) i.e atom, element, pure substance .

Atom, is the smallest unit of matter that has the characteristic properties of a chemical element .The atom is the basic building block of chemistry.

Element  is a pure substance consisting of only one type of atom which all have the same numbers of protons. Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions.

Hence ,in the list that  only includes terms that describe Cesium (Cs) is option (b) i.e atom, element, pure substance .

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Answer:

Explanation:

Since Lithium gives away one electron, I believe it goes to Sulfur.

Hope this helps! :)

Answer:

Li*2S

Explanation:

ed tell chem

Answer:

80.07 g/mol

Explanation:

Sulfur's g/mol = 32.07

Oxygen's g/mol = 16.00

32.07 + 16.00(3) = 80.07 g/mol

Answer:

80.07 g/mol

Explanation:

Answer:

[He] 2s2 2p2

Explanation:

Answer:

On the basis of this explanation, if the rate of lactate production is high enough, the cellular proton buffering capacity can be exceeded, resulting in a decrease in cellular pH. These biochemical events have been termed lactic acidosis. ... Every time ATP is broken down to ADP and Pi, a proton is released

Explanation:

Arginine is most likely to be found in a neutral chemical form in a cell under normal physiological conditions. The correct option is C.

Arginine is a chemical compound that is produced by the human body. It is an amino acid that is used to make proteins. It's a part of a group of amino acids known as non-essential amino acids, which implies that the human body can make them in the absence of food intake.

Arginine is a basic amino acid that has a nitrogen group attached to its side chain. Under normal physiological conditions, arginine is mostly in a neutral form. It means that it neither has a positive charge nor a negative charge.

Because of the amino group, arginine can serve as a proton acceptor or donor, depending on the pH of the solution it's in. It can be partially protonated or partially deprotonated in such situations.

Arginine can be found in a variety of food sources, including meat, poultry, and fish. The body can also manufacture arginine, which is an essential component of many proteins.

Arginine has a variety of functions in the human body, including: It is a precursor to nitric oxide, which is a vasodilator that helps to regulate blood pressure.

It plays a key role in the immune system's functions. It is needed for the production of creatine, which is used to generate energy in the muscles. It has a significant impact on wound healing and tissue repair.

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Answer:

-149.0K

Explanation:

Charles's law states that the volume of a gas is directly proportional to the absolute temperature under constant pressure.

The equation is:

V1/T1 = V2/T2

Where V1 is initial volume = 6.00L

T1 is absolute initial temperature = 25.0°C + 273 = 298K

V2 is final volume = 2.50L

T2 is our incognite

Replacing:

6.00L/298K = 2.50L/T2

T2 = 2.50L * 298K / 6.00L

T2 = 124.17K

The temperature is 124.17K - 273.15K =

The oxygen atom is sp3 hybridized in dialkyl ethers. In dialkyl ethers, the oxygen atom forms two sigma bonds with the two alkyl groups that are linked to it as well as two lone electron pairs.

As a result of hybridizing oxygen's one s orbital and three p orbitals, these four electron pairs now occupy four equivalent hybrid orbitals.

Resulting sp3 hybrid orbitals have bond angles of approximately 109.5° and are orientated in a tetrahedral configuration. Due to this hybridization, the oxygen atom may effectively establish covalent bonds with the two alkyl groups, resulting in a molecular structure that is stable.

Stability and reactivity of these compounds are greatly influenced by sp3 hybridization of the oxygen atom in dialkyl ethers.

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For the specified reaction, K is roughly equal to 0.0219.

To calculate the value of the equilibrium constant (K) for the given reaction, we'll use the expression for K, which is the ratio of the product of the equilibrium concentrations of the products to the product of the equilibrium concentrations of the reactants, each raised to the power of their respective stoichiometric coefficients.

For the reaction \(N_2(g) + 3 H_2(g)\) ⇌ \(2 NH_3(g)\), the equilibrium constant expression is:

\(K = [NH_3]^2\) / \([N_2] * [H_2]^3\)

Given the equilibrium concentrations: \([N_2]\) = 1.30 \(M\), \([H_2]\) = 1.30\(M\), and \([NH_3]\) = 0.250 M, we can now substitute these values into the expression:

K = \((0.250)^2\) / \((1.30 * (1.30)^3)\)

Now, we can perform the calculations:

K = 0.0625 / (1.30 * 2.197)

K ≈ 0.0625 / 2.8541

K ≈ 0.0219

Thus, the value of K for the given reaction is approximately 0.0219.

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The equilibrium will shift to the right, producing more NH₃(g).

When the volume is decreased at a constant temperature, the pressure initially rises. By lowering the pressure, the system will find equilibrium again, and in order to do so, the equilibrium must be moved to the side with the fewest moles of gas. Compared to the reactant side, which has four moles of gas, the product side has just two moles. The equilibrium will move to the right as the volume is decreased (with an initial increase in pressure).

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Answer:

D. 34.5g

Explanation:

Using the following formula to calculate the mass of 1.5moles of sodium (Na);

Mole = mass/molar mass

Molar mass of Na = 23g/mol

mass = mole × molar mass

Mass of Na = 1.5mol × 23g/mol

Mass of Na = 34.5g

Based on the information given, it seems that the unknown solid compound was soluble in water at room temperature.

After stirring for some time, all of the compound dissolved in the distilled water. The solution was then drained off and the water was evaporated under vacuum. This caused the compound to precipitate out of the solution and form a solid. The solid was then washed, dried, and weighed to determine its mass. It's possible that this process was used to isolate and purify the compound from impurities or other substances in the original sample. The final weight of the precipitate will depend on the initial quantity of the unknown solid that was added to the distilled water.

A chemistry student added an unknown solid compound to distilled water at a specific temperature. After a certain period of stirring, the compound completely dissolved. The student then separated the solution and evaporated the water under vacuum. This process resulted in a precipitate, which the student washed, dried, and weighed. The weight of the precipitate was recorded, helping to identify the unknown compound and its properties through this experimental procedure.

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The values of all sub-parts have been obtained.

(a) The 6.04 amol/vescile of epinephrine are in each vesicle.

(b) The 3637892 molecules of epinephrine are in each vesicle.

(c) The volume of a spherical vesicle is V = 3.34 × 10⁻¹⁷ L.

(d) The concentration of epinephrine = 0.30 M.

What is molar concentration.

A chemical species' concentration, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per litre, denoted by the unit sign mol/L or mol/dm3 in SI units, is the most often used molarity unit in chemistry.

(a) Evaluate that how many attomoles (amol) of epinephrine are in each vesicle?

As given,

1 fmol = 10⁻¹⁵ mol

1 amol = 10⁻¹⁸ mol

Number of attomoles epinephrine:

= 151 fmol × (10⁻¹⁵ mol)/ 1 fmol × 1amol/10⁻¹⁸ mol

= 151000 amol

Number of attomoles of epinephrine in each vescile:

= 151000 amol/2.5 × 10⁴ vescile

= 6.04 amol/vescile.

(b) Evaluate that how many molecules of epinephrine are in each vesicle?

Number of molecules present in 1 mol of epinephrine:

     = 6.04/vescile × [(10⁻¹⁵ mol)/ 1 fmol] × [6.023 × 10²³ molecules/1 mol]

     = 3637892

(c) Evaluate the volume of a spherical vesicle of radius 200 nm.

Radius of spherical vescile is 2.00 × 10⁻⁷ m

Volume of the spherical vescile is,

V = 4/3 πr³

Substitute value of r respectively,

V = 4/3 π(2.00 × 10⁻⁷ )³

V = 3.34 × 10⁻²⁰ m³

V = 3.34 × 10⁻¹⁷ L

(d) Evaluate the molar concentration of epinephrine in the vesicle if it contains 10 amol of epinephrine.

Number of moles epinephrine = 10 amol

= 1.00 × 10⁻¹⁷mol

Volume of the spherical vescile = 3.34 × 10⁻¹⁷ L

Concentration of epinephrine = (1.00 × 10⁻¹⁷mol)/(3.34 × 10⁻¹⁷ L)

Concentration of epinephrine = 0.30 M

Hence, the values of all sub-parts have been obtained.

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The frequency of light if radiated by an electron moving from orbit n1=2 n1=2 to n2=1n2=1 inside of a He ion is 8.2295 x 10⁶ m⁻¹.

The frequency of light fff radiated by an electron moving from orbit n1=2n1=2 to n2=1n2=1 inside of a he he ion can be found using the Rydberg formula.

The Rydberg constant, denoted by the symbol R∞, is a fundamental constant in physics that appears in the formula describing the wavelengths of spectral lines in the hydrogen atom. It is named after the Swedish physicist Johannes Rydberg, who extensively studied atomic spectra in the late 19th century. The Rydberg constant is a measure of the energy levels of electrons in an atom.

The formula for finding the frequency of emitted light is given by: f = R(1/n12−1/n22)f = R(1/n12−1/n22), where R is the Rydberg constant, n1 is the initial orbit and n2 is the final orbit. The Rydberg constant is equal to 1.0974 x 10⁷ m⁻¹. Substituting the given values into the formula, we get: f = 1.0974 x 10⁷ m⁻¹,  (1/2² − 1/1²)f = 1.0974 x 10⁷ m⁻¹ (1/4 − 1/1)f = 1.0974 x 10⁷ m⁻¹ (3/4)f = 8.2295 x 10⁶ m⁻¹.

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Answer:

it is ductile

Explanation:

i took the test

Answer:

b

Explanation:

The molecular mass of the gas if 200 mL of gas weighs 0.344 grams at STP is 38.53g/mol. Details on how to calculate molecular mass can be found below.

The molecular mass of a gas can be calculated by using the following expression:

Molecular weight of the gas = mass × volume at STP (22.4L)/ volume of gas

= 0.344 × 22.4/0.2

= 7.7056/0.2

= 38.53g/mol

Therefore, the molecular mass of the gas if 200 mL of gas weighs 0.344 grams at STP is 38.53g/mol.

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The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).

An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.

This means that the number of protons in an atom is unique to a specific element.

Iron (Fe) has 26 protons in the nucleus of its atom.

Therefore, an ion with 26 protons is an ion of the element iron (Fe).

Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.

Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons  is Fe (option c)

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Mass of Nd₂(SO₄)₃ : 2.653 g

Reaction

Nd₂Fe₁₄B + 17H₂SO₄ → Nd₂(SO₄)₃ + 14FeSO₄ + B + 17H₂

5 g Nd₂Fe₁₄B

MW = 2. 144,242 + 14. 55.845 + 10.811

MW = 288.484 + 781.83+10.811=1081.125 g/mol

mol :

\(\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{5}{1081.125}=0.0046\)

mol Nd₂Fe₁₄B = mol Nd₂(SO₄)₃=0.0046

so mass of Nd₂(SO₄)₃ :

MW Nd₂(SO₄)₃ = 2.144.242+3.32,065+12.15,999

MW = 288.484+96.195+191.988=576.667 g/mol

\(\tt mass=mol\times MW\\\\mass=0.0046\times 576.667\\\\mass=2.653~g\)

Answer:

Line graph

Explanation:

I did it on Study Island

Radioisotopes are substances that are radioactive and have atoms with an unstable nucleus. The data about the radioisotope can be best organized in a line graph. Thus, option B is correct.

A graph is a tool used to represent the data that contains the numerical data and includes the vertices and points to show the numbers and information in a statistical way. It is used to represent the variables of the tables in an easy and understandable manner.

Graphs can be bars, points, lines, columns, bubbles, areas, pie charts, etc. The line graphs use lines to connect the individual variables and are used to track the changes in radioactive material over a time period. It can easily represent the half-life and the remaining time of the radioactive decay.

Therefore, option B. a line graph will be best to represent the information.

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Lisa's results can be presented in the following table:

Tablet Volume of HCl added (mL)

A                16

B                 15

C                 8

D                 12

b. Lisa should use a bar graph to show her results.

A bar chart or bar graph is described as a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent.

The x-axis can be labeled with the different types of tablets (A, B, C, and D), and the y-axis can be labeled with the volume of hydrochloric acid needed to change the color of the universal indicator.

Each bar in the graph is expected to represent the volume of hydrochloric acid needed for a particular type of tablet.

The bar graph will allow Lisa to easily compare the results for each tablet and determine which one had the best antacid properties.

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Answer:

true

...................

Answer:

I think it is a color but I'm not completely sure

Answer:

Color

Explanation:

Answer:silicon (Si) and geranium (Ge)

Explanation:

Silicon and germanium have the same valency. So the correct option is C.

Valence is also referred valency, in the field of chemistry is  defined as the property of an element which will determine how many other atoms can this atom combine with

This term was introduced in the year 1868. It is mainly used to present the combination ability of an element in general and also the numerical value of that power of combination.

A major challenge for the chemists of the 19th century was the explanation and the systematization of valency.

When there was an absence of a determination of its cause, the efforts started to centre on the development of empirical rules for determining the numerical values of valences.

The number of atoms of hydrogen with which an atom of the atom can combine or can replace a compound is defined as the characteristic valences for the elements.

Therefore the correct option is C.

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Answer:

Similar propoties is the answer

Answer:

28

Explanation:

it states that the atom is neutral, meaning the number of electrons and protons are the same. so if there are 13 electrons, there are 13 protons. And the mass number is neutrons plus protons. So 13+15 is 28