suppose you mix 100.0 g of water at 24.9 c with 75.0 g of water at 71.0 c. what will the final temperature of the mixed water in c?

Answer:

a. catalyst

Explanation:

a catalyst slows activation energy down for a reaction

The maximum amount of strong base that can be added to the buffer without significantly changing the pH is 0.35 mol.

Sodium carbonate is a white, odorless powder that is commonly used in various applications such as in the manufacture of glass, soaps and detergents, water softening, and as a food additive. It is an ionic compound made up of sodium cations (Na+) and carbonate anions ( 2-). It is also known as washing soda, soda ash, or sal soda.

According to given data, Number of moles of NaH = 0.35 mol. To calculate the initial pH of the buffer, we need to use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where pKa is the acid dissociation constant of the weak acid in the buffer (in this case, carbonic acid, ), [A-] is the concentration of the conjugate base (in this case, bicarbonate ion, H-), and [HA] is the concentration of the weak acid (in this case, carbonic acid, ).

The pKa of carbonic acid is 6.35, and the concentrations of H- and  can be calculated using the initial amounts of NaH  and Na2and the stoichiometry of the reaction:

[H-] = [NaH] = 0.35 mol / (0.35 mol + 0.50 mol) = 0.411 M

[NaH] - [H-] = 0.35 M - 0.411 M = -0.061 M

substituting these values into the Henderson-Hasselbalch equation, we get:

pH = 6.35 + log(0.411 / (-0.061))

pH = 9.17

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Answer:

The difference between an atom and an ion has to do with net electrical charge. An ion is a particle or collection of particles with a net positive or negative charge. ... A stable atom contains the same number of electrons as protons and no net charge. When electrons are added or removed, the stable atom becomes an ion.Apr 12, 2015

Explanation:

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Answer: D: both teams will remain in place.

Explanation: if both teams have the same amount of force, they will cancel each other out and stay in place.

Answer:

it is 75 degrees

Explanation:

Volume is 138.7 mL.

The equation for calculation of volume is as follows:-

\(\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}\)

STP:-

Temperature=273 K

Pressure=1 atm

\(\frac{1 atm\times250mL}{273 K} =\frac{2 atm\times V_2}{303\ K}\\V_2=138.7\ mL\)

Hence, the volume is 138.7 mL.

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Answer:

The linear sequence of amino acids within a protein is considered the primary structure of the protein. Proteins are built from a set of only twenty amino acids, each of which has a unique side chain. The side chains of amino acids have different chemistries.

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To calculate the moles of oxygen in the reaction vessel, we will use the ideal gas law, which states:

PV = nRT

where P is the pressure in atmospheres, V is the volume in liters, n is the number of moles, R is the gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.

Is the temperature in Kelvin. First, we need to convert the temperature from Celsius to Kelvin:

T = 24.5oC + 273.15 = 297.65 K

Now we can plug in the values we know:

28.3 atm * 0.193 L = n * 0.0821 L·atm/mol·K * 297.65 K

Simplifying this equation, we get:

n = (28.3 atm * 0.193 L) / (0.0821 L·atm/mol·K * 297.65 K)

n = 0.0228 mol

Therefore, there are 0.0228 moles of oxygen in the reaction vessel.

Answer:

1

Explanation:

Ag+

From the given reaction, it is clear that, Ag is gaining electrons from the base NH₃ . Hence, according to Lewis concept of acids and bases, Ag⁺ is the Lewis acid.

There are various concepts to define acids and bases. Among which the first was Arrhenius theory. This theory states that, acids are substances which can furnish H+ in solution and bases are substances giving OH- in solution.

Then Bronsted- Lowry concept states acids as proton donor and bases as proton acceptors. The most applicable theory for acids and bases is Lewis concept.

According to Lewis theory of acids and bases, acids are electrons acceptors and bases are electron donors.

The given reaction is written as:

\(\rm Ag^{+} + 2NH_{3} \rightarrow Ag(NH_{3})_{2}\)

Here, Ag⁺ is the Lewis acid which accepts an electron from the Lewis base NH₃.

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Answer:

Explanation:    Nitrogen has been the group 15 element of the periodic table that has atomic number 7. Nitrogen is likely to form three covalent bonds.  the answer is 3.

Answer:

your answer for that problem is 34.5

The concentration of the final solution will be 0.2886 M.

50.6 g of NaCl is dissolved in 600 mL of water.

Mole of 50.6 g NaCl = 50.6/58.44 = 0.8658 mol

Molar concentration of the oiriginal solution = 0.8658/06 = 1.4431 M

25 mL of 1.4431 M of the solution is diluted up to the 125 mL mark.

m1 = 1.4431, v1 = 25 ml, v2 = 125 mL

m2 = m1v1/v2 = 1.4431 x 25/125 = 0.2886 M

The concentration of the final solution will be 0.2886 M

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The volume of 0.500-M KOH(aq) should be added to 100 ml of a buffer solution initially containing 0.13 mol HF and 0.16 mol of NaF is 100 mL of 0.500 M KOH. ka = 6.8 × 10⁴ and pH is 3.59

given that :

ka = 6.8 × 10⁴

and pH is 3.59

moles of HF = 0.13 mol

moles of NaF = 0.16 mol

the pH formula is given as :

pH = pka + log [base]/[acid]

pH = -log(6.8 × 10⁻⁴) + log (0.16 ) / 0.13

pH =  3.33  + 0.0899

pH = 3.5

Thus, the volume of 0.500 M KOH should be added to a buffer solution 0.500 M.

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A litmus test for cult organizations is that strict hierarchy and control mechanisms are part of the structure.

A litmus test for cult organizations is that charismatic leaders are often central to the structure. Cults are typically defined by a hierarchical structure with a charismatic leader at the top who has complete authority over their followers. This leader is often seen as having divine or special powers and is considered infallible. The leader's followers are expected to unquestioningly obey their commands and are often subjected to psychological manipulation and isolation from outside influences. In many cases, the cult leader will also be involved in the day-to-day operations of the organization, including the financial and legal aspects. This emphasis on a charismatic leader as a central figure in the organization is a defining feature of many cults.

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When sodium phosphate reacts with sulfuric acid, forming sodium sulfate and phosphoric acid, the stoichiometric coefficient for sulfuric acid in the balanced chemical equation is 3.

In every balanced chemical equation, the total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side. The stoichiometric coefficient is the number written in front of each reactants and products that tells how many moles of each are needed in the reaction.

The chemical equation for the given reaction is:

\(Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(Na_{2} SO_{4}\) + \(H_{3} PO_{4}\)

Put the necessary stoichiometric coefficient to balance each element.

Balancing Na:

\(2Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(H_{3} PO_{4}\)

Balancing P:

\(2Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

Balancing S:

\(2Na_{3} PO_{4}\) + \(3H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

Notice that H and O are already balanced.

Hence, the balanced chemical equation for the reaction is:

\(2Na_{3} PO_{4}\) + \(3H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

where 3 is the stoichiometric coefficient of sulfuric acid, \(H_{2} SO_{4}\).

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Answer:

heterogeneous mixture

Explanation:

the particles of each substance can be seen and the mixture has more than one set of properties.

1. Gravitational lensing is the phenomenon that we call a massive object that can distort the light of more distant objects behind it.

2. WIMPs (weakly interacting massive particles) are defined as subatomic particles that have more mass than neutrinos but do not interact with normal matter.

3. The rotation curves of spiral galaxies provide strong evidence for the existence of dark matter.

4. Baryonic matter made from atoms with nuclei consisting of protons and neutrons, represents what we call ordinary matter.

5. Models show that the evolution of the universe is better-explained when we include the effects of dark matter along with the effects of luminous matter.

6. Matter consisting of particles that differ from those found in atoms is generally referred to as exotic matter.

What is dark matter? Dark matter is a kind of matter that scientists assume to exist since it does not interact with light and cannot be seen through telescopes. Dark matter is believed to account for approximately 27% of the matter in the universe. Dark matter interacts gravitationally with visible matter and radiation, but it doesn't interact with electromagnetism, making it completely invisible to telescopes that observe electromagnetic radiation, such as radio waves, infrared light, visible light, ultraviolet light, X-rays, and gamma rays.

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Answer:

0.13 grams of O2

Explanation:

Just did worksheet

heat is transferred from your hand to the ice cube

Answer:

Heat is transferred from your hand to the ice cube.

Answer:

Because they cannot be separated into more then one type of substance.

Explanation:

Answer:

Elements are made of only one kind of atom. The particles can be a single atom or a molecule made of only one kind of atom. There is no physical change that can separate elements into more than one kind of substance. This makes an element a pure substance.An element is made up of only one type of atom. An element cannot be broken down into a simpler form.

All of the above forces (ionic interactions, H-bonding, van der Waals forces, metal ions, and disulfide bonds) play a role in stabilizing the 3-dimensional structure of proteins. Thus, the correct answer is Choice 6 of 6: all of the above.

Ionic interactions occur between positively and negatively charged amino acid residues, which helps to maintain the overall charge balance of the protein. H-bonding involves the sharing of electrons between atoms, and helps to hold the protein's secondary and tertiary structures in place. Van der Waals forces are relatively weak interactions between atoms, but they can contribute to the stability of the protein by helping to hold the atoms in place. Metal ions can also play a role in stabilizing the protein by binding to specific amino acid residues. Disulfide bonds form between cysteine residues and help to hold the protein's tertiary structure in place.

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A dehydration reaction (or condensation reaction) is the process in which water molecules are produced as a polymer is formed from monomers.

A chemical reaction is the process by which substances called reactants are transformed to another substance known as products through the breaking up or building up of bonds between the reactants.

There are different types of chemicals reaction which includes condensation reaction.

Condensation reaction involves the combination of two smaller molecules known as monomers to for one larger molecule known as polymer with the loss of water molecule.

Condensation reaction is specifically called dehydration reaction due to the loss of water molecule that is involved.

Therefore, a dehydration reaction (or condensation reaction) is the process in which water molecules are produced as a polymer is formed from monomers.

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The horizontal component of velocity is constant throughout the motion. The distance traveled by the projectile is given by the equation d = V^2 sin2θ/g where d is the distance traveled.

Carl Lewis at the 1992 Olympics in Barcelona, Spain, won gold medals for the long jump (28 feet 5.5 inches).

This resulted from an initial velocity of 9.5 m/s at an angle of 40 degrees to the horizontal.Initial velocity is the initial speed and direction of a moving object at a particular instant in time.

Its direction is typically measured in degrees, with 0 degrees being to the right, 90 degrees being up, and 180 degrees being to the left. The horizontal is the axis that runs from left to right.

The angle between the horizontal and the initial velocity vector is referred to as the angle of projection. This is usually referred to as the theta symbol.

The vertical component of velocity is equal to the initial velocity multiplied by the sine of the angle of projection. This is due to the fact that velocity can be broken down into horizontal and vertical components.

The horizontal velocity is constant throughout the motion and the vertical velocity changes due to gravity.

Therefore, the vertical component of velocity is zero at the top of the motion and maximum at the bottom.

The maximum height reached by the projectile is given by the equation h = V^2 sin^2θ/2g where h is the maximum height, V is the initial velocity, θ is the angle of projection, and g is the acceleration due to gravity.

On the other hand, the horizontal component of velocity is equal to the initial velocity multiplied by the cosine of the angle of projection.

This is due to the fact that velocity can be broken down into horizontal and vertical components.

The horizontal velocity is constant throughout the motion and the vertical velocity changes due to gravity.

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Answer:

Elements are pure substances which are composed of only one type of atom. Compound are substances which are formed by two or more different types of elements that are united chemically in fixed portions.

Answer:

The concentration of a conjugate base is twice that of the concentration of a conjugate acid

Explanation:

This is because at the midpoint, the number of moles of acid equals half the number of moles of base at the midpoint. This means that at the midpoint, half the analyte has been titrated.

Since the concentration of the conjugate acid is half that of the conjugate base at the midpoint, this implies that the concentration of the conjugate base is twice that of the conjugate acid.

Thus, at the midpoint of a titration curve the concentration of a conjugate base is twice that of the concentration of a conjugate acid

Answer:

Explanation:

This practical can be used to introduce the idea that the relative amounts of a fuel and oxygen (from air) are important in combustion, and that there will be an optimum ratio in which the two substances react. This leads on to the idea of chemical equations.

In the case of a class experiment, where students generate the hydrogen themselves under strict supervision, all the hydrogen generators must be collected once the test tubes have been filled and before any flames are lit, to prevent the possibility of accidental or deliberate ignition of the hydrogen in the generator. This has caused a number of accidents in the past. Alternatively the test tubes could be filled with hydrogen beforehand, or by students under supervision, from a steady cylinder supply.

The atomic number of an element represents the number of protons in an atom of that element. Since the isotope given is Mn-59, the atomic number of manganese (Mn) remains the same, which is 25.

If an atom of Mn-59 has a charge of +5, it means that it has lost 5 electrons. The number of protons in an atom is equal to its atomic number, and the number of electrons is equal to the number of protons in a neutral atom. Therefore, if the atom has lost 5 electrons, the number of protons remains the same, which is 25.

So, an atom of Mn-59 with a charge of +5 has 25 protons.

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(I would appreciate a thanks, a rating and/or a Brainliest rating if this helped you)

Answer:

2.35 x 10^-19 joules

Explanation:

The energy (E) of a photon can be calculated using the following formula:

 E = hν

where h is Planck's constant (6.626 x 10^-34 joule seconds) and ν is the frequency of the radiation.

So, to calculate the energy of a photon with a frequency of 3.54 x 10^14 hertz, we can substitute the values in the formula:

 E = (6.626 x 10^-34 J s) x (3.54 x 10^14 Hz)

E = 2.35 x 10^-19 joules

Therefore, the energy of a photon of radiation with a frequency of 3.54×10^14 hertz is 2.35 x 10^-19 joules.