What is the concentration of a 2. 5 l solution containing 1. 3 mol nacl?.

Answer:

the bus will stop here, wouldn't it?

The endpoint and equivalence point are two significant phases that are attained throughout the procedure.

The chemical equivalent between the added titrant and the sample analyte is referred to as the point of equivalence in a titration. Endpoint, on the other hand, is the location where the color of the solution changes. The equivalence point, or the ideal point for the termination of the titration, occurs when the moles of a standard solution (the titrant) equal the moles of a solution of unknown concentration (the analyte). At the titration's equivalence point, just enough titrant is given to totally neutralize the analyte solution.

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The pressure of hydrogen gas formed in mmHg is 745.7 mmHg. In order to find the pressure of hydrogen gas formed in mmHg, we need to make use of the Dalton's Law of Partial Pressures which states that the total pressure of a gas mixture is equal to the sum of the partial pressures of each individual gas present.

We know that the total pressure of gas collected over water is 770.0 mmHg and that the temperature is 25.5 °C. Since the gas was collected over water, we know that it must have contained some amount of water vapor. This means that the total pressure is equal to the sum of the partial pressures of hydrogen gas and water vapor. Let's use this information to find the partial pressure of hydrogen gas.1.

We can use a table or a graph to find this value. A quick search shows that the vapor pressure of water at 25.5 °C is 24.3 mmHg.2.

Now we can use the Dalton's Law of Partial Pressures to find the partial pressure of hydrogen gas. P total = PH₂ + P water PH₂ = P total - P water

PH2 = 770.0 mmHg - 24.3 mmHg

PH2 = 745.7 mmHg.

Therefore, the pressure of hydrogen gas formed in mmHg is 745.7 mmHg.

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Answer:

Volume = 190.8

To find the overall enthalpy change of turning gaseous atoms into their gaseous ions with more than 1- charge, you need to consider the successive electron affinity values of the element. Electron affinity is the energy change associated with adding an electron to a gaseous atom. When an element forms an ion with more than a 1- charge, it has accepted multiple electrons.

To calculate the overall enthalpy change, you should sum up the enthalpy changes for each successive electron addition. For example, if an element forms an ion with a 2- charge, you would consider the first and second electron affinity values.

Keep in mind that the first electron affinity is generally exothermic (energy is released), while the second electron affinity is typically endothermic (energy is absorbed). Therefore, when calculating the overall enthalpy change, you should account for the positive and negative values associated with the successive electron affinity values.

Once you've summed up the enthalpy changes for each electron addition, you will have the overall enthalpy change for converting the gaseous atoms into their corresponding gaseous ions.

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Alpha, beta, and protons can all particles be accelerated by an electric field. Therefore, option 3 is correct.

The physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them, is known as an electric field. It also refers to the physical field of a charged particle system.

Particle acceleration is a straightforward concept: an electric field moves a charged particle from one location to another. Because electric fields do not act on neutral particles, they can only accelerate electrons, protons, ions, and various antiparticles.

Thus, option 3 is correct.

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Answer:

ok.

Explanation:

you're answers are correct.

The scientific statement is

D. There is life on some other planet in the universe aside from Earth.

A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.

Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.

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complete question

Which sentence is a scientific statement?

A.

Food cooked in ceramic pots has a better aroma than food cooked in copper pots.

B.

A tall glass of water tastes better with a lemon wedge and ice cubes.

C.

Today, there are more viewers watching baseball than ice hockey on television.

D.

There is life on some other planet in the universe aside from Earth

The number of observations for carbon dioxide production in response to adding glucose to the fermentation medium is 8.

In the given context, it is stated that there were 9 wells in the experiment where different amounts of glucose were added to the fermentation medium. It is also mentioned that the initial well with only distilled water was used as a control, implying that it did not contain glucose. Therefore, the number of observations for carbon dioxide production in response to adding glucose would be one less than the total number of wells.

As per the provided procedure, there were a total of 9 wells, so the number of observations would be 8. Each well represents a different condition or amount of glucose, and the carbon dioxide production would be measured or observed for each well. These observations would be used to analyze the effects of glucose concentration on carbon dioxide production in the fermentation medium.

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The molarity of the unknown solution will be 1.310 M.It is denoted by M₂.

Molarity is defined as the ratio of the moles to the volume of the solution.

Given data;

Volume of unknown solution,V₁ = 10.5 mL

The volume of diluted solution,V₂ = 80.0 mL

Molarity of new solution,M₁ = 0.172 M

Molarity of unknown solution, M₂=?

For dilution we use the formula as;

M₁V₁=M₂V₂

M₂=M₂V₂/V₁

M₂ = ( 80 × 0.172 ) / 10.5

M₂= 1.310 M

Hence the molarity of the unknown solution will be 1.310 M.

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Answer:

Mass = 312 g

Explanation:

Given data:

Number of molecules of H₂ = 9.4 × 10²⁵

Mass in gram = ?

Solution:

First of all we will calculate the number of moles of H₂.

1 mole of H₂ contain 6.022× 10²³ molecules

9.4 × 10²⁵ molecules  × 1 mol / 6.022× 10²³ molecules

1.56× 10² mol

156 moles of H₂:

Mass in gram:

Mass = number of mole × molar mass

Mass = 156 mol × 2 g/mol

Mass = 312 g

Answer:

Heyaa!! Im Pinky and Im here to inform you that your answer is...

Explanation:

!!! 36.8189451 Grams !!!

  Have an amazing day!!!

~Pinky~!!

The insolubility of calcium sulfide (CaS) in water is due to weak ion-dipole interactions, strong ion-ion interactions, the presence of covalent bonds, and a decrease in entropy upon dissolution.

These factors prevent CaS from dissolving in water and result in its insoluble nature. Calcium sulfide (CaS) is insoluble in water due to several reasons:
1. Ion-dipole interactions: When a salt dissolves in water, the positive ions are attracted to the negative end of water molecules (oxygen atom), and the negative ions are attracted to the positive end of water molecules (hydrogen atoms). However, in the case of calcium sulfide (CaS), the ion-dipole interactions between the calcium ions (Ca2+) and water molecules are very weak. This means that the attraction between the Ca2+ ions and water molecules is not strong enough to overcome the strong attraction between the Ca2+ ions and the sulfide ions (S2-), resulting in the insolubility of CaS in water.

2. Ion-ion interactions: In the case of salts containing Ca2+ ions, they are generally insoluble in water. This is because the ion-ion interactions between the Ca2+ and sulfide ions (S2-) are very strong. The attractive forces between these ions are much stronger than the attractive forces between the ions and water molecules. As a result, the Ca2+ and sulfide ions remain together as a solid rather than dissolving in water.

3. Covalent bonds: Another reason for the insolubility of CaS in water is the presence of covalent bonds in the compound. In CaS, the calcium and sulfur atoms are bonded together by covalent bonds. Covalent bonds are formed by the sharing of electrons between atoms. Breaking these covalent bonds requires a significant amount of energy. Therefore, for CaS to dissolve in water, the energy required to break the covalent bonds would be too high, making it unlikely for the compound to dissolve.

4. ΔS (change in entropy): When a substance dissolves in water, there is often an increase in the disorder or randomness of the system, which is indicated by a positive change in entropy (ΔS). However, in the case of CaS, the possible arrangements for water molecules would decrease upon dissolution, resulting in a negative change in entropy (ΔS). This decrease in entropy further contributes to the insolubility of CaS in water.

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The dye concentration in the original solution is approximately 14.8 M, based on the dilution factor calculated from the given volumes. The final diluted sample had a concentration of 0.019 M.

To calculate the dye concentration in the original solution, we can use the concept of dilution.

Let's denote the concentration of the original solution as C1 (in M).

In the first dilution step:

Volume of the original solution taken = 1.28 mL

Volume after dilution = 100.00 mL

Dilution factor = (final volume) / (initial volume) = (100.00 mL) / (1.28 mL)

In the second dilution step:

Volume of the first diluted solution taken = 2.89 mL

Volume after dilution = 100.00 mL

Dilution factor = (final volume) / (initial volume) = (100.00 mL) / (2.89 mL)

The overall dilution factor is the product of the individual dilution factors. Let's denote it as DF.

DF = (100.00 mL / 1.28 mL) * (100.00 mL / 2.89 mL)

Since the dye concentration in the final diluted sample is 0.019 M, we can use this information to calculate the dye concentration in the original solution:

C1 = (dye concentration in the final diluted sample) * DF

  = 0.019 M * DF

Calculating the dilution factor:

DF = (100.00 mL / 1.28 mL) * (100.00 mL / 2.89 mL)

  = 781.25

Calculating the dye concentration in the original solution:

C1 = 0.019 M * 781.25

  ≈ 14.8 M

Therefore, the dye concentration in the original solution is approximately 14.8 M.

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The melting point of gold is 1947°F. This temperature in degrees Celsius 1063.889°C and in kelvin is 1337.039K.

Temperature is a physical quantity that quantifies our feelings of hotness and coldness. A thermometer is used to measure temperature.

According to the International System of Units, the SI unit of temperature is Kelvin, which is represented by the symbol K. In the fields of science and engineering, the Kelvin scale is widely accepted or used. However, in most parts of the world, temperature is measured using the Celsius or Fahrenheit scale.

Thus, The melting point of gold is 1947°F. This temperature in degrees Celsius 1063.889°C and in kelvin is 1337.039K.

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Answer:

2.38 g of oxygen (O2).

Explanation:

What is given?

Mass of potassium chlorate (KClO3) = 6.06 g.

Molar mass of KClO3 = 122.4 g/mol.

Molar mass of oxygen (O2) = 32 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation. Remember that the decomposition of a compound produces two or more products:

Now, let's convert 6.06 g of KClO3 to moles using its molar mass:

You can see in the chemical equation that 2 moles of KClO3 produce 3 moles of O2. By doing a rule of three with this data, we obtain that:

The final step is to convert from 0.0743 moles of O2 to grams using its molar mass, like this:

The answer is that we will produce 2.38 g of oxygen (O2) from the decomposition of 6.06 g of potassium chlorate (KClO3).

Answer

Procedure

Considering the following chemical equation, which is already balanced

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

We assume there is enough oxygen to react with all propane and thus, propane is the limiting reactant

Therefore we use the equation to determine the amount of propane

189.68g CO₂ /

doAnswer:

Explanation:

i  don¨t lf it rigtht but i thnk it C3h8 an a thank u

Answer:

Chapter 2.

Explanation:

Since the chapter is going to be talking about how animals have to get food and why it is difficult, you will find that "consumers" are included in this topic.

Consumers are organisms that eat other organisms to get energy. Therefore, in Chapter 2, you will be learning about organisms and how they get food, and consumers will be in that as well.

I hope this helps!

-No one

Answer: If a substance has a boiling point of \(78^{o}C\) then it is true that it will also change from a gas to a liquid at 78 °C while the gas loses energy.

Explanation:

The temperature at which vapor pressure of a liquid substance becomes equal to the atmospheric pressure is called boiling point of substance.

At the boiling point, liquid phase and vapor phase remains in equilibrium.

This means that as liquid phase changes into vapor phase and also vapor phase changes into liquid phase at the boiling point.

Thus, we can conclude that if a substance has a boiling point of \(78^{o}C\) then it is true that it will also change from a gas to a liquid at 78 °C while the gas loses energy.

During electrolysis, a current is passed through the molten MgCl2, and when this happens, the Mg2+ ions move to the negative electrode where they PICK UP OR GAIN ELECTRONS. This is reduction. The Cl- ions move to the positive electrode where they LOSE ELECTRONS. This is oxidation.

Answer:

Baseball: PE

Satellite: KE

Sky Diver: KE

Basketball: PE

Arrow: KE

Cliff Diver: PE

Swinging Girl: PE

Grasshopper: PE

Bobsled: KE

Slingshot: PE

Explanation:

  For a thrown object, KE and PE are in a sort of equilibrium. As the object climbs towards its highest point, it slows down as the initial KE that initiated the movement runs out. At the highest point, it is out of kinetic energy and full of potential energy. Gravity then pulls on the object and causes it to accelerate, thus giving it more KE. The PE at the top of the arc is because at that point, the object has the potential to fall to earth. This is the reasoning behind the baseball, swinging girl, and grasshopper.

  This is, in a way, the same reasoning behind the other potential energy cases as well. The basketball, cliff diver, and slingshot are all about to start moving. The first two will be pulled by gravity and the last one will be propelled be the stretchy slingshot material attempting to snap back into place.

  All of the KE examples are due to the object or person actively moving towards or around something. This means that they have kinetic energy--the energy of movement!

Answer:

Baseball: Potential Energy

Satellite: Kinetic Energy

Sky Diver: Kinetic Energy

Basketball: Potential Energy

Arrow: Kinetic Energy

Cliff Diver: Potential Energy

Swinging Girl: Potential Energy

Grasshopper: Potential Energy

Bobsled: Kinetic Energy

Slingshot: Potential Energy

Explanation:

The new temperature in °C is -31.3 °C.

When 8.0 J of thermal energy is removed from an ideal gas consisting of 2.2×10^22 atoms at 20 °C, the new temperature is calculated using the formula:

ΔT = ΔQ / (n * Cv)

where ΔT is the change in temperature, ΔQ is the change in thermal energy, n is the number of atoms, and Cv is the molar specific heat at constant volume.

First, we need to calculate the molar specific heat at constant volume (Cv) for an ideal gas. For a monoatomic ideal gas, Cv is given by:

Cv = (3/2) * R

where R is the gas constant.

Next, we substitute the given values into the formula:

ΔT = 8.0 J / (2.2×10^22 atoms * (3/2) * R)

To convert the temperature change from joules to degrees Celsius, we need to divide ΔT by the molar specific heat capacity (Cv) in J/(mol·K). Rearranging the formula, we get:

ΔT = ΔT / Cv

Finally, we substitute the value of Cv and evaluate the expression:

ΔT = 8.0 J / (2.2×10^22 atoms * (3/2) * 8.314 J/(mol·K))

After performing the calculations, the new temperature is approximately -31.3 °C.

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Explanation:

a) K(s) + I2(s)  --> KI(s)

The balanced equation is;

2K(s) + I2(s)  --> 2KI(s)

b) Mg(s)  +  Br2(l)  --> MgBr2(s)

The balanced equation is;

Mg(s)  +  Br2(l)  --> MgBr2(s)

c) KBr(aq)  +  AgNO3(aq)  --> KNO3(aq)  + AgBr(s)

The balanced equation is;

KBr(aq)  +  AgNO3(aq)  --> KNO3(aq)  + AgBr(s)

d) KClO3(s)  --> KCl(s)  +  O2(g)

The balanced equation is;

2KClO3(s)  --> 2KCl(s)  +  3O2(g)

e) C2H6(g)  +  O2(g)  -->  CO2(g)  + H2O(l)

The balanced equation is;

2C2H6(g)  +  7O2(g)  --> 4CO2(g)  + 6H2O(l)

f) Al(s)  +  O2(g)  --> Al2O3(s)

The balanced equation is;

4Al(s)  +  3O2(g)  --> 2Al2O3(s)

g) P4(s)  +  H2(g)  --> PH3(g)

The balanced equation is;

P4(s)  +  6H2(g)  --> 4PH3(g)

Examples of radioactive machines and sources include X-ray machines (producing X-rays), nuclear reactors (producing gamma rays and neutrons), and radioactive isotopes (emitting alpha, beta, or gamma radiation). Shielding materials such as lead, concrete, and water are commonly used to protect against ionizing radiation.

Radioactive machines and sources are used in various fields such as medicine, industry, and research. One commonly encountered radioactive machine is the X-ray machine, which produces X-rays.

X-rays are a form of ionizing radiation that can penetrate the body and create images of bones and tissues. X-ray machines are used for diagnostic purposes in medical settings, helping to identify fractures, tumors, and other medical conditions.

Another example is nuclear reactors, which produce both gamma rays and neutrons. Gamma rays are highly penetrating electromagnetic radiation, while neutrons are subatomic particles that can cause ionization upon interaction with matter.

Nuclear reactors are used to generate electricity, conduct scientific research, and produce radioisotopes for medical and industrial applications.

Radioactive isotopes are another source of ionizing radiation. They can emit different types of radiation, including alpha particles, beta particles, and gamma rays. For instance, alpha particles consist of two protons and two neutrons, and they have low penetration power.

Beta particles are high-energy electrons or positrons, while gamma rays are electromagnetic waves with high energy and penetration ability.

To protect against ionizing radiation, various shielding materials are employed. Lead is commonly used due to its high density, which effectively absorbs and attenuates gamma rays and X-rays.

Concrete is another commonly used material, providing sufficient thickness to reduce the penetration of gamma rays. Water is also used as a shielding material, particularly in nuclear reactors, as it can effectively absorb neutrons.

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Answer:

Oil and water: mixture/heterogeneous

Explanation:

1. Oil and water: mixture/heterogeneous

Oil and water do not mix to a uniform consistency throughout

2. Copper wire: element

3. Chalk: compound

4. Sugar and water: mixture/homogeneous

Sugar and water mix perfectly and create a solution.

5. Water: compound

6. Salt and water: mixture/homogeneous

Salt and water also create a solution (saline)

7. Aluminum foil: element

8. Air in a balloon: mixture/homogeneous if random air or element if filled with specific gas like helium

9. Nitrogen: element

10. Pizza: mixture/heterogeneous

Each substance on the pizza can be readily identified and seperated

Answer

Tropical storms like hurricanes form over warm ocean waters, which supply the energy for hurricanes and typhoons to grow and move, often over land.

Hurricanes take in the heat from warm waters, which gives them power. In the clouds, water condenses and forms droplets, releasing even more heat

Explanation:

hope that helps

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The Combination of sand and salt in a bowl is :