15_4_4_11=51 what are the missing operations only using 3 of these /,*,-,+

Answer:

The increase in the concentration of reactants increases the frequency of effective collisions.

Explanation:

The concentration of reactants determines the rate of reaction by providing the number of reactants available to yield an effective collision. There is a direct relationship between the concentration of reactants and rate of reaction.

The empirical formula of the compound with 0.123 moles of bromine and 0.123 moles of lead would be  PbBr.

The empirical formula of a compound is the chemical formula of the compound where the component atoms are in their simplest, whole-number ratios.

In this case, the compound contains bromine and lead:

Br = 0.123 mole

Pb = 0.123 mole

Dividing through by the smallest mole

Br = 0.123/0.123 = 1

Pb = 0.123/0.123 = 1

Thus, bromine and lead are present in a 1:1 ratio in the chemical formula.

In other words, the empirical formula of the compound containing 0.123 moles of bromine and 0.123 moles of lead is PbBr.

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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 10.0−mL solution of 0.660 M NH₃ is titrated with a 0.220 M HCl solution. The PH after the following additions of the HCl solution: a) pH = 11.24, b) pH = 8.44, c) pH = 6.37, d) pH = 5.20.

PH stands for potential hydrogen. It is a measure of the acidity or alkalinity of a solution and is measured on a scale of 0-14. A solution with a pH of 0 is highly acidic, a solution with a pH of 7 is neutral, and a solution with a pH of 14 is highly alkaline.

a) pH = 11.24

The pH of the NH₃ solution before any HCl has been added is 11.24, since the initial concentration of NH₃ is much higher than the HCl.

b) pH = 8.44

After 10.0 mL of the HCl solution has been added, the solution is at the equivalence point, where the amount of HCl added is equal to the amount of NH₃ in the solution. The pH of the solution is 8.44, which is the pH of a 1:1 mixture of NH₃ and HCl.

c) pH = 6.37

After 30.0 mL of the HCl solution has been added, the amount of HCl is now three times the amount of NH₃. The pH of the solution is 6.37, which is the pH of a 1:3 mixture of NH₃ and HCl.

d) pH = 5.20

After 40.0 mL of the HCl solution has been added, the amount of HCl is now four times the amount of NH₃. The pH of the solution is 5.20, which is the pH of a 1:4 mixture of NH₃ and HCl.

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Answer:

.

Explanation:

a rare gas of Group 18 (noble gases) of the periodic table, which forms relatively few chemical compounds. About three times heavier than air, krypton is colourless, odourless, tasteless, and monatomic. Although traces are present in meteorites and minerals, krypton is more plentiful in Earth’s atmosphere, which contains 1.14 parts per million by volume of krypton.

the answer is 17.031 g/mol

Answer:

17.031 g/mol

Explanation:

hard to explanation

When discussing distance in the solar system,you use Relative Distance.This tells you the space between two objects with location.

D. Relative distance

The relative distance is the distance that you are felt to cover up, taking the time used to obtain there. Distance relative to a particular reference point, typically one in motion.

Relative distance is calculated measuring distance, using metrics such as time, effort, or cost.

In space, Relative distance means how far apart the planets are when compared to each other and the sun.

Thus, the correct option is D.

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Changing the volume of the reaction container for a reaction involving gases, changing the temperature of the system, and changing the concentrations of reactants or products can all disturb a chemical equilibrium.

Additionally, using a larger container for a reaction in aqueous solution can also cause a shift in the equilibrium.

Chemical equilibrium is a state of balance reached between the forward and reverse reactions in a chemical system. In a chemical equilibrium, the rate of the forward and reverse reactions is equal, and the concentrations of reactants and products remain constant. This is because the rate of the forward reaction is equal to the rate of the reverse reaction, and the system is in a state of dynamic balance.

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Explanation:

The properties of the hydrogen chloride:

Answer:

\(\boxed {\boxed {\sf B. \ 3}}\)

Explanation:

First, identify the elements.

Next, identify any subscripts or coefficients. This would indicate there are multiple atoms of each element or group of elements.

There are none, so each element has 1 atom.

There are 3 elements with 1 atom each, so 3*1= 3

This chemical formula has 3 atoms and B is correct.

Answer:Heart muscle is a type of muscle found in the walls of the heart. It works involuntarily. This mechanism is due to the internal stimulation of the heart, and there are two. These are atrio-ventricular and sinoatrial nodes.

Explanation:Thanks for the score, have a nice day

The muscle tissue of the heart is called cardiac muscle

If more \(H_{2}\) and \(N_{2}\) are added to the reaction 3\(H_{2}\) + N2 → 2\(NH_{3}\) after it reaches equilibrium, two events will occur Shift in Equilibrium and Increased Yield of \(NH_{3}\)

1. Shift in Equilibrium: According to Le Chatelier's principle, when additional reactants are added, the equilibrium will shift in the forward direction to consume the added reactants and establish a new equilibrium. In this case, more \(NH_{3}\) will be produced to counteract the increase in \(H_{2}\) and \(N_{2}\).

2. Increased Yield of \(NH_{3}\): The shift in equilibrium towards the forward reaction will result in an increased yield of \(NH_{3}\). As more \(H_{2}\) and \(N_{2}\) are added, the reaction will favor the production of \(NH_{3}\) to maintain equilibrium. This will lead to an increase in the concentration of \(NH_{3}\) compared to the initial equilibrium state.

It is important to note that the equilibrium position will ultimately depend on factors such as the concentrations of \(H_{2}\), \(N_{2}\), and \(NH_{3}\), as well as the temperature and pressure of the system. By adding more reactants, the equilibrium will adjust to achieve a new balance, favoring the formation of more \(NH_{3}\).

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Answer:

1.07x10^24

Explanation:

thats the answer

Therefore, the number of mole will be 1.065 × \(10^{24}\).

What is mole?

A mole is the quantity of a substance containing 6.023 x \(10^{23}\) particles of that substance. The mole is really the SI unit for a substance's quantity.

It is given that, mass of 230 gram of CoCl2.

Moles = mass / molar mass

Put the value of given data in mole formula.

Moles = 230 / 129.8

Moles = 1.77

It is known that, 1 mole = 6.02 × \(10^{23}\) molecule.

Hence, 177 moles =  6.02 × \(10^{23}\) × 1.77 = 10.65 ×  \(10^{23}\) .

Therefore, the number of mole will be 1.065 × \(10^{24}\).

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When a solution is prepared by dissolving 7.00 grams of NH4Cl in enough water to make 500. ml of solution then its molarity is 2 mol/L

Moles of NH4Cl = given mass / molar mass

moles = \(\frac{7 g}{53,5 g/mol}\) = 0.13 moles of NH4Cl

500 ml = 500 g

Molarity = moles of solute / mass of solvent in kg

Molarity = \(\frac{0.1}{500} . 1000\)

Molarity = 2 mol/L

A mole is a unit of measurement for a chemical substance, and it is from this unit that the word "molarity" is derived. The method of figuring out how much of a substance a specific chemical solution contains is known as molecularity, also known as the molar concentration of a solution. According to mathematics, molarity is: Molarity is the sum of the solute's moles. litres of the solution. Since the volume of the solution will be measured in litres and the number of moles of solute is measured in mol. So, mol L – 1 is the unit of molarity.

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1) False ; 2) K⁺ ion channels are open and responsible for membrane rapid repolarization of a nerve fiber ; 3)Excitatory graded potentials are the result of the opening of receptors operated sodium channels

1) It is false that the movement of Na+ out of a nerve cell following a depolarization event. When a depolarization event occurs in a neuron, sodium channels open, and sodium ions move into the neuron, resulting in the membrane potential becoming more positive.

2. K⁺: K⁺ ion channels are open and responsible for membrane rapid repolarization of a nerve fiber. The rapid repolarization phase of the action potential is the result of the potassium channels opening and potassium ions leaving the cell.

3. Opening of receptors operated sodium channels: Excitatory graded potentials are the result of the opening of receptors operated sodium channels. The result is the depolarization of the postsynaptic neuron and the initiation of an action potential. Inhibitory graded potentials are the result of opening potassium channels, increasing the membrane potential's negative charge to reduce the likelihood of depolarization.

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111900g  is the weight of an object that has the area of 74.6 m² and exerts a pressure of 1500 N/m².

Weight being a force The SI unit for weight is Newton (N), which also happens to be the same as the SI unit for force. When we look at how weight is expressed, we can see how it depends on both mass as well as the acceleration caused by gravity; while the mass might not vary from one location to another, the acceleration caused by gravity does.

Pressure = thrust/ area

              = weight/ area

1500  = weight/ 74.6

weight = 111900g

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Answer:

B. hydrogen only.

Explanation:

The element hydrogen is a made up of only hydrogen atoms which are the particles in the element.

Hydrogen is an element. It has distinct hydrogen atoms that typifies it.

An element is a distinct substance that is made up of one kind of atom. The only kind of atom in element hydrogen is those hydrogen itself.

H2CO3 is carbonic acid and is liable for the carbonation in many drinks (CO2 gas). Orange juice does not contain H2CO3 but has H2C6H6O6.

Vitamin C is called as ascorbic acid. It is required by the body to help wounds heal, to enhance the absorption of iron from plant foods, and to support the immune system.

Acidic solution forming with HCl and water.

HCl + H2O → H3O+ + Cl-

The existence of H3O+ is the hydronium ion, and one definition of an acid is something that donates a proton (H+). HCl in this case does just that.

NaOH + H2O →Na+ + OH- so it donates or makes OH- ions, thus making a basic solution.

An indicator is a substance that alters color when in acid or base.

Three important acids and three important bases

Acids: HCl (hydrochloric acid), CH3COOH (acetic acid), and H3PO4 (phosphoric acid)

Bases:  NaOH (sodium hydroxide), NH3 (ammonia), and NH4OH (ammonium hydroxide)

NH3 + H2O ⇾ NH4OH ⇾ NH4+ + OH-

Ca(OH)2 + H2O ⇾ Ca2+ + 2OH-

NH3 forms OH- ions by accepting H+ from H2O

Ca(OH)2 forms OH- ions by ionizing

H2CO3 is carbonic acid and is liable for the carbonation in many drinks (CO2 gas).  H2C6H6O6 is the formula of ascorbic acid, or vitamin C (assuming you meant H2C6H6O6). This could be orange juice for example.

Thus, Orange juice does not contain H2CO3 but has H2C6H6O6.

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The molar concentration of lithium ions in the Li3PO4 solution is 1.65 M.

To determine the molar concentration of lithium ions in a Li3PO4 solution, we need to consider the ratio of lithium ions to Li3PO4 in the compound.

In Li3PO4, there are three lithium ions (Li+) for every one formula unit of Li3PO4. Therefore, the molar concentration of lithium ions will be three times the molar concentration of Li3PO4.

Given that the molar concentration of Li3PO4 is 0.550 M, the molar concentration of lithium ions will be:

0.550 M × 3 = 1.65 M

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Answer: As a result an increase in kinetic energy also happens.

Explanation:

Potential energy is the energy occupied by an object or substance due to its position.

Kinetic energy is the energy occupied by an object of substance due to its motion.

If the kinetic and potential energy in a system are equal and then an increase in potential energy will occur.

As a  result, there will also occur an increase in kinetic energy also.

Thus, we can conclude that as a result an increase in kinetic energy also happens.

40 ml of the NaOH is required to reach the equivalence point, if you start with 1 m NaOH and 40 ml of 1 m acetic acid.

The molarity of a substance refers to how much of it is present in a given volume of solution (M). Molarity is the measure of the amount of solute per liter of solution. Molarity is also referred to as a solution's molar concentration.

Let the volume of NaOH is V ml.

molarity of NaOH (M₁) is 1 m.

Moles of NaOH(n₁) = molarity × volume

n₁ = 1 × V

n₁ = V mmol

Molarity of CH₃COOH (acetic acid) is 1M

Volume of  CH₃COOH is 40ml.

moles of CH₃COOH = 40 × 1

moles of CH₃COOH = 40 mmol

Reaction:

NaOH (aq) + CH₃COOH(aq) → CH₃COO⁻Na⁺(s) + H₂O

At equivalent point:

moles of acid = moles of base

moles of CH₃COOH = moles of NaOH

40 mml = V mml

∴ V= 40 ml

NaOH required is 40 ml.

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Answer:

it is D

Explanation:

because it is a substance that participants in a chemical reaction.

Answer:

Meiosis

Explanation:

.bnsksksksjabsn...

Answer:

sana makatulong po sainyo

Answer:

To determine the number of moles of solute present in a solution, we can use the formula:

moles of solute = molarity x volume (in liters)

Given that the volume of the solution is 5.0 L and the molarity is 5.0 M, we can calculate the number of moles of solute as:

moles of solute = 5.0 M x 5.0 L

moles of solute = 25 mol

Therefore, there are 25 moles of potassium nitrate (KNO3) present in 5.0 L of a 5.0 M solution.

How many moles of solute are present in 5.0 L of a 5.0 M potassium nitrate (KNO3) solution?

Answer:

25 moles

Answer:

Explanation:

So, to begin answering your question, Earth has a greater gravitational pull than the moon simply because the Earth is more massive. The moon's gravitational pull also affects Earth, though; the rising and falling of the tides are an effect of the moon's gravity.      HOPE THIS HELPS ^^

The oxidation and reduction half-reactions can be described as follows:

Oxidation half-reaction:

Al(s) → Al^3+(aq) + 3e^-

Reduction half-reaction:

3Ag^+(aq) + 3e^- → 3Ag(s)

In a redox reaction,  the oxidation half-reaction involves the loss of electrons (oxidation), while the reduction half-reaction involves the gain of electrons (reduction).

Here, the oxidation half-reaction, aluminum (Al) is being oxidized as it loses three electrons, forming aluminum ions (Al^3+). This indicates the loss of electrons, which is typical of an oxidation process.

In the reduction half-reaction, silver ions (Ag^+) are being reduced as they gain three electrons, forming solid silver (Ag). This indicates the gain of electrons, which is typical of a reduction process.

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.598 moles of H2

Find the balanced equation of the reaction

2Na    + 2 H2 0  ====>  2  Na OH  +  H2

27.5 gm of Na is   27.5/ 22.989 =1.196 moles

from the equation, each mole of Na produces 1/2 mole of H2

 1.196 moles * 1/2 = .598 moles of H2

Moles of sodium

2 mol Na produces 1 mol H2

1 mol produces 0.5mol H2

1.196 mol produces 0.598mol

No of molecules