Which scientist developed the 1st model of the atom that showed the structure of the inside of an atom?
A. Dalton
B. Borh
C. Rutherford
D. Thomson

The molarity of the hydrochloric acid, HCl solution given the data is 0.079 M

HCl + NaOH —> NaCl + H₂O

From the balanced equation above,

MaVa / MbVb = nA / nB

(Ma × 27.9) / (0.137 × 16.1) = 1

(Ma × 27.9) / 2.2057  = 1

Cross multiply

Ma × 27.9 = 2.2057

Divide both side by 27.9

Ma = 2.2057 / 27.9

Ma = 0.079 M

Thus, the molarity of the HCl solution is 0.079 M

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To determine the closest value for the ΔG° of a nickel-cadmium voltaic cell, we need to understand the relationship between ΔG° and the cell potential (E°). The formula to calculate ΔG° is:

ΔG° = -nFE°

where n is the number of moles of electrons transferred, F is the Faraday constant (approximately 96,485 C/mol), and E° is the cell potential.

For a nickel-cadmium voltaic cell, the cell potential E° is approximately 1.50 V. The number of moles of electrons transferred (n) is 2. Plugging these values into the formula:

ΔG° = -(2)(96485 C/mol)(1.50 V)

ΔG° ≈ -289,455 J

Since 1 kJ = 1000 J, we can convert the result to kJ:

ΔG° ≈ -289.5 kJ

Among the given options, the closest value to the ΔG° for a nickel-cadmium voltaic cell is -125 kJ.

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The pressure of the gas in the final state, when the volume is raised to 4.22 m³ and the temperature is raised to 30.4°C, is approximately 154,485 Pa.

To calculate the number of moles of gas present in the initial state, we can use the ideal gas law equation:

PV = nRT

Where:

P is the pressure of the gas

V is the volume of the gas

n is the number of moles of gas

R is the ideal gas constant

T is the temperature of the gas in Kelvin

First, let's convert the initial temperature from Celsius to Kelvin:

T₁ = 12.1°C + 273.15 = 285.25 K

Now we can calculate the number of moles (n₁) using the initial conditions:

P₁ = 1.96 × 10⁵ Pa

V₁ = 3.22 m³

R = 8.314 J/(mol·K)

n₁ = (P₁ * V₁) / (R * T₁)

Substituting the values:

n₁ = (1.96 × 10⁵ Pa * 3.22 m³) / (8.314 J/(mol·K) * 285.25 K)

n₁ ≈ 28.15 mol

So, there are approximately 28.15 moles of gas present in the initial state.

To calculate the final pressure (P₂) when the volume is raised to 4.22 m³ and the temperature is raised to 30.4°C, we can use the same ideal gas law equation:

P₂ = (n₁ * R * T₂) / V₂

where:

T₂ = 30.4°C + 273.15 = 303.55 K

V₂ = 4.22 m³

Substituting the values:

P₂ = (28.15 mol * 8.314 J/(mol·K) * 303.55 K) / 4.22 m³

P₂ ≈ 154,485 Pa

Therefore, the pressure of the gas in the final state, when the volume is raised to 4.22 m³ and the temperature is raised to 30.4°C, is approximately 154,485 Pa.

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Answer:

I think alkali metals will be the answer.

Answer in the attachment above.....

An extremely efficient enzyme has a small KM and a large kcat.

The conversion rate at the lowest substrate concentration is measured in kcat/km. This interpretation is accurate. kcat/Km is a good indicator of an enzyme's effectiveness since it takes into account both the enzyme's maximum rate, kcat, and its affinity for its substrate (Km).The turnover number, or the number of molecules that may be created per second per active site, of an enzyme is provided by the formula k c a t / kM.Because the substrate concentration is almost usually much greater than the Km, in many situations, enzymes are only better when they have a larger kcat. It seems disingenuous to me to use the ratio when this is plainly the case, yet it still happens much too frequently. It could serve as a useful benchmark when compared to enzymes in particular situations.

complete question:An extremely efficient enzyme has a _____ KM and a _____ kcat.

A) small; small

B) small; large

C) large; large

D) large; small

E) kcat and KM do nothing to predict the efficiency of an enzyme

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Answer:

Displacement reactions occur when a more reactive metal reacts to displace a less reactive metal in a compound.

Explanation:

Answer:

answer is d

i hope this helps you

The reaction that represents natural nuclear decay is 335 U → He + 331 Th, i.e., option C.

Nuclear reactors continue to operate by enclosing the nuclear fission process.

Even after fission has stopped, radioactive decay of fission products and transuranic elements formed in a reactor produces heat.

Fission reactions can be moderated in order to increase fission or unmoderated in order to breed more fuel.

The reaction that represents natural nuclear decay is

Thus, the correct option is C.

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Answer:

3

Explanation:

It's basically saying what number goes into 12 four times, I think.

Increasing the NaCl concentration will increase the osmotic pressure.

Osmotic pressure, alongside the vapor pressure depression, freezing point depression and the boiling point elevation are the colligative properties od solution.

The direction of osmotic pressure is always from the side with the lower concentration of solute to the side with the higher concentration.

π = c(NaCl) × T(NaCL) × R

π is osmotic pressure

c is concentration of solution.

T is temperature in Kelvins.

R is universal gas constant.

Greater the concentration of sodium chloride, the greater is the osmotic pressure, because the osmotic pressure and the concentratio are in direct proportion.

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Diffusion is the process by which particles (such as molecules, ions, or atoms) move from an area of higher concentration to an area of lower concentration, driven by the concentration gradient.

A concentration gradient refers to the difference in concentration between two regions. In diffusion, particles move randomly and collide with each other, causing them to spread out and distribute themselves evenly.

As particles move from higher concentration to lower concentration, the concentration gradient decreases, resulting in the equalization of concentrations over time. This movement occurs due to the natural tendency of particles to achieve a state of equilibrium, where there is no net movement of particles across the concentration gradient.

Diffusion plays a crucial role in various biological, physical, and chemical processes, such as gas exchange in the lungs, the transport of nutrients across cell membranes, and the mixing of substances in solutions.

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Answer:

true

Explanation:

17.0 g of Al₂O₃ forms from 16 g of O₂ and excess Al ,and when the molar mass of  Al₂O₃ is 102 g/mol.

Molar mass is the mass of one mole of a substance. It is usually expressed in units of grams per mole (g/mol). For example, the molar mass of carbon is 12.01 g/mol, which means that one mole of carbon has a mass of 12.01 grams. Molar mass is useful in chemistry because it allows us to convert between mass and moles of a substance, which is important for many chemical calculations.

The molar mass of  Al₂O₃ is 102 g/mol, which means that for every 102 g of  Al₂O₃ produced, 3 × 32 g (or 96 g) of O₂ is consumed.

We can use this ratio to find the mass of  Al₂O₃ formed from 16 g of O₂:

96 g of O₂ produces 102 g of  Al₂O₃

1 g of O₂ produces (102 g / 96 g) of Al₂O₃

16 g of O₂ produces (102 g / 96 g) × 16 g = 17.0 g of  Al₂O₃

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Answer:

44 g

Explanation:

hope this helps

The acid mostly dissociates when dissolves in water.

option C.

A strong acid is an acid that is completely dissociated in an aqueous solution such as water when it is dissolved in it.  Strong acid is a chemical species with a high capacity to lose a proton, H+.

In other words, a strong acid is one which is virtually 100% ionized in solution.

Thus, when a compound is described as a strong acid it means that: the acid mostly dissociates when dissolves in water.

So option C is the correct answer as it explains the meaning of a strong acid.

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Answer:

you have to answer it in your own words and with information you know not from someone else

sorry kiddo

Explanation:

Answer: What type of telescope can you use in a bedroom?

B.An optical telescope

Explanation:

AI-generated answer

Optical telescopes are designed to collect and focus visible light. They use lenses or mirrors to gather and magnify light from distant objects in the sky.

Optical telescopes are suitable for bedroom use because they are compact and easy to set up. They come in various sizes, ranging from small handheld telescopes to larger models that can be mounted on a tripod. You can place an optical telescope near a window or on a balcony to observe celestial objects such as the moon, planets, stars, and even galaxies.

A solution that has many ions in solution and turns pH paper orange is likely to be an acidic solution with a pH between 3 and 5.

The presence of many ions in solution indicates that the solution is likely to be a strong electrolyte, meaning that it contains a high concentration of ions that dissociate completely in water.

This could be due to the presence of a strong acid or a strong salt in the solution. The orange color on the pH paper indicates that the solution has a pH in the acidic range, which is consistent with the high concentration of H+ ions in an acidic solution.

Therefore, the solution can be classified as a strong acidic solution.

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The phase transition which occurs when a substance increases temperature at constant pressure is solid to liquid. The correct option is A.

It can be seen in the attached diagram that when the substance is at 120 degrees C and 925 mmHg, it is in the solid phase. Then, if we increase the temperature while keeping the pressure as constant, it will change to the liquid phase.

The lines represent the combinations of pressures and temperatures where two phases can exist in equilibrium. In another words, these lines show phase change points. The line divides the solid and gas phases, defines sublimation (solid to gas) and deposition (gas to solid).

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Although part of your question is missing, you might be referring to this full question: Consider the phase diagram shown here. A sample of the substance in the phase diagram is initially at 120 degrees C and 925 mmHg. What phase transition occurs when a substance increases temperature at constant pressure?

a) solid to liquid

b) liquid to gas

c) solid to gas

d) liquid to solid

Answer:

Elements are arranged from left to right and top to bottom in order of increasing atomic number

Explanation:

This is what I remember from Chemerstry a few years ago

Answer:

Fossil fuels contribute to greenhouse gases, which is one of their major disadvantages. The most harmful for the environment is coal because it has many more harmful combustion products than other fossil fuels.

Answer:

It means that its outermost energy level is fully filled with electrons.

Explanation:

You can take an example of all group VIII elements such as noble gases, xenon, krypyon.

This atom is very stable hence cannot participate in any type of bonding.

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The balanced chemical equation for the reaction between sodium and oxygen to form sodium oxide is: 4Na + O2 → 2Na2O According to the balanced equation, 4 moles of sodium react with 1 mole of oxygen to produce 2 moles of sodium oxide.

Therefore, the stoichiometric ratio is 4:1:2 (sodium:oxygen:sodium oxide). If you have 8 moles of sodium, you can use the stoichiometry to determine the amount of sodium oxide produced. Since the ratio of sodium to sodium oxide is 4:2, you would expect to produce half the number of moles of sodium oxide compared to the moles of sodium. Therefore, with 8 moles of sodium, you would expect to produce 4 moles of sodium oxide.

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Answer:

The defect of vision suffered by the person is Myopia

Explanation:

The person can't see farther objects but is able to read a book which is placed closely to the eyes, using these observations the person is suffering from MYOPIA(nearsightedness) in which observer see close objects clearly but farther objects appear blurred.

The light entering the eye isn't correctly bent, the eyeball becomes big , or the eye lens become too converging, which converges the light ray in front of the cornea

This defect can be cured by using concave lenses.

Answer:

What are the two animals?

Explanation:

(a) The reaction with Delta H = 12.6 kJ/mol and Delta S = 93 J/K·mol is spontaneous at 25°C.

(b) The reaction with Delta H = 9.5 kJ/mol and Delta S = -94.0 J/K·mol is not spontaneous at 25°C.

To determine whether a reaction is spontaneous at a given temperature, we can use the Gibbs free energy equation: Delta G = Delta H - T·Delta S, where Delta G is the change in Gibbs free energy, Delta H is the change in enthalpy, Delta S is the change in entropy, and T is the temperature in Kelvin.

For a reaction to be spontaneous, Delta G must be negative. If Delta H is negative (exothermic) and Delta S is positive (increase in disorder), the reaction is more likely to be spontaneous.

(a) For the reaction with Delta H = 12.6 kJ/mol and Delta S = 93 J/K·mol, we have Delta G = 12.6 kJ/mol - (25 + 273) K·(93 J/K·mol/1000 J/kJ) = -5.25 kJ/mol. Since Delta G is negative, the reaction is spontaneous at 25°C.

(b) For the reaction with Delta H = 9.5 kJ/mol and Delta S = -94.0 J/K·mol, we have Delta G = 9.5 kJ/mol - (25 + 273) K·(-94.0 J/K·mol/1000 J/kJ) = 3.57 kJ/mol. Since Delta G is positive, the reaction is not spontaneous at 25°C.

To determine the minimum temperature at which a non-spontaneous reaction becomes spontaneous, we can set Delta G equal to zero and solve for T in the equation Delta G = Delta H - T·Delta S. However, in this case, both reactions are either spontaneous or non-spontaneous at 25°C, so we do not need to calculate the minimum temperature.

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Answer:

1 mole of magnesium are required to react with 2.0 mol of hydrochloric acid.

Explanation:

The balanced reaction is:

Mg + 2 HCl → MgCl₂ + H₂

The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products. That is, the law of conservation of mass implies that the sum total of charges before and after the chemical reaction remains constant.

The relationships between the quantities of reactants consumed and products formed depend directly on this conservation law, and therefore can be determined by an equation that describes them. This equality is called the stoichiometric equation.

In this case, by stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), you have:

Then, 1 mole of magnesium are required to react with 2.0 mol of hydrochloric acid.

Answer:

1 mole of magnesium, Mg

Explanation:

The balanced equation for the reaction is given below:

Mg + 2HCl —> MgCl₂ + H₂

From the balanced equation above,

We can see clearly that 1 mole of Mg requires 2 moles of HCl.

Thus, 1 mole of magnesium, Mg is needed for the reaction.

In many acid-base reactions, a starting material with a net Positive charge is usually an acid while a starting material with a net Negative charge is often a base.

In many acid-base reactions, a starting material with a net positive charge is usually an acid, while a starting material with a net negative charge is often a base. Acids are substances that can donate protons (H+) and are therefore positively charged when they lose a proton. Bases, on the other hand, can accept protons (H+) and tend to have a net negative charge when they gain a proton. This is based on the concept of proton transfer in acid-base reactions, where the acid donates a proton (positive charge) to the base, resulting in the formation of a new acid and base. It's important to note that not all acids or bases have a net charge, as their acidity or basicity can also be determined by other factors such as electron pair donation or acceptance.

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