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The change in temperature during a chemical reaction can provide information about whether the reaction is exothermic (releases heat) or endothermic (absorbs heat).

The change in temperature of a chemical reaction is often an important indicator of the energy absorbed or released during the reaction. In this case, we have two different reactions occurring in two separate beakers, with different temperature changes.

In beaker A, the temperature increases from 25 to 40 degrees. This suggests that the reaction in beaker A is exothermic, meaning that it releases heat to the surroundings. The reaction is giving off energy, which is reflected in the temperature increase of the beaker.

In beaker B, the temperature decreases from 25 to 20 degrees. This suggests that the reaction in beaker B is endothermic, meaning that it absorbs heat from the surroundings. The reaction is taking in energy, which is reflected in the temperature decrease of the beaker.

It's worth noting that the temperature change alone is not sufficient to determine the nature of the reaction (i.e. exothermic or endothermic). Other factors, such as the reaction equation and the properties of the reactants and products, must also be considered. However, temperature change can be a useful clue in identifying the energy changes that occur during a chemical reaction.

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Explanation:

We are given different isotopes and we have to identify the number of protons and neutrons that are in the nuclueus of each atom.

a) Carbon-14:

By definition two isotopes are atoms that have the same atomic number but different mass number. The atomic number of an atom is equal to the number of protons of that atom, and the mass number is equal to the number of protons plus the number of neutrons.

atomic number = n° of protons

mass number = n° of protons + n° of neutrons

n° of protons = atomic number

n° of neutrons = mass number - n° of protons

n° of neutrons = mass number - atomic number

If two isotopes have the same atomic number but different mass number we can say that two isotopes have the same number of protons but different number of neutrons.

In we pay attention to carbon-14 we can look for its atomic number in the period table: 6. And its mass number is the one that we are given after the name of the element: 14.

n° of protons = atomic number = 6

n° of protons = 6

n° of neutrons = mass number - atomic number = 14 - 6

n° of neutrons = 8

b) Cobalt-60:

atomic number = 27 (from the periodic table)

mass number = 60

n° of protons = atomic number = 27

n° of protons = 27

n° of neutrons = mass number - atomic number = 60 - 27

n° of neutrons = 33

c) Gold-197:

atomic number = 79 (from the periodic table)

mass number = 197

n° of protons = atomic number = 79

n° of protons = 79

n° of neutrons = mass number - atomic number = 197 - 79

n° of neutrons = 118

d) Uranium-235:

atomic number = 92 (from the periodic table)

mass number = 235

n° of protons = atomic number = 92

n° of protons = 92

n° of neutrons = mass number - atomic number = 235 - 92

n° of neutrons = 143

Answer:

a) Carbon-14: n° of protons = 6 n° of neutrons = 8

b) Cobalt-60: n° of protons = 27 n° of neutrons = 33

c) Gold-197: n° of protons = 79 n° of neutrons = 118

d) Uranium-235: n° of protons = 92 n° of neutrons = 143

Answer:

Cooler, denser air flows in underneath the warmer, less dense air, and pushes the warmer air upward. When this air cools, it becomes more dense than the warmer air beneath it. The cooled air sinks and moves under the warmer air.

Answer

Hot air is less dense than cold air, which is why hot air rises and cold air sinks, according to the United States Department of Energy. Hot and cold air currents power the weather systems on earth. The sun plays a major role in heating the planet, which also creates hot and cold air energy systems. Warm air currents typically bring rain, because they form over oceans. That’s why hurricanes and tropical storms form at sea and eventually move toward land.

The comparison between the class barometer data and the air pressure shown in the weather report serves as a means to evaluate the accuracy and effectiveness of the barometer's measurements.

The comparison between the data from the class barometer and the air pressure shown in the weather report revealed a correlation between the two measurements. The class barometer readings were likely taken at the same time as the weather report's air pressure measurement to ensure accurate comparison.

If the class barometer readings closely matched the air pressure indicated in the weather report, it would suggest that the barometer was functioning correctly and providing reliable measurements. This would indicate that the class barometer could be used as a reliable tool for monitoring air pressure changes.

However, if there were significant discrepancies between the class barometer readings and the air pressure reported in the weather report, it could indicate a calibration issue with the barometer or potential inaccuracies in its measurements. In such a case, it would be necessary to investigate the reasons behind the discrepancies and determine the reliability of the class barometer for future use. It helps to determine the barometer's reliability as a tool for monitoring air pressure changes in the local environment.

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The percent by mass of acetic acid in the vinegar is 2.33%.

Below are the steps to solve the given problem using the data table given below:

Step 1: Calculate the mass of the vinegar. Given,Mass of flask and vinegar solution- 25.17gMass of flask- 15.12gMass of vinegar solution = Mass of flask and vinegar solution - Mass of flask= 25.17 g - 15.12 g= 10.05 g

Step 2: Calculate the moles of NaOH used in the titration.Molarity of NaOH solution is 0.1 M.Moles of NaOH = Molarity × Volume of NaOH usedMoles of NaOH = 0.1 M × 39.00 mL (since the initial volume of NaOH is 0.00 mL)Moles of NaOH = 0.0039 moles

Step 3: Determine the moles of acetic acid used in the reaction.The balanced chemical equation for the reaction between NaOH and acetic acid (the main component of vinegar) is given below:CH3COOH + NaOH → CH3COONa + H2OMoles of NaOH = Moles of CH3COOH (since they react in a 1:1 ratio)Moles of CH3COOH = 0.0039 moles

Step 4: Calculate the mass of acetic acid used in the reaction.Molar mass of acetic acid is 60.05 g/mol.Mass of CH3COOH = Moles of CH3COOH × Molar mass of CH3COOH= 0.0039 moles × 60.05 g/mol= 0.234 gStep 5: Calculate the percent by mass of acetic acid in the vinegar.Percent by mass of acetic acid = (Mass of CH3COOH / Mass of vinegar solution) × 100%= (0.234 g / 10.05 g) × 100%= 2.33%.

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Answer: 51.6667c    324.817K

Explanation:

125°F temperature in degrees Celsius is 51.67  °C and in kelvins is 324.67 kelvin.

Temperature is a bodily amount that expresses the hotness of a count number or radiation. There are 3 kinds of temperature scales.

Temperature is the diploma or depth of the warmth present in a substance or a machine, expressed primarily based on the comparative scale and proven by a thermometer. In other phrases, Temperature is the degree of hotness or coldness of a frame measured by the usage of Celsius, Kelvin, and Fahrenheit scales.

Temperature is measured with thermometers. commonplace thermometers include a tumbler rod with a totally skinny tube in it. The tube carries a liquid that is furnished from a reservoir, or "bulb," at the base of the thermometer. every now and then the liquid is mercury, and every so often it is pink-colored alcohol.

To convert °C into Fahrenheit:-

F = 9/5 °C + 32

°C = (F - 32)× 5/9

    = (125 -32) × 5/9

    = 93 × 5/9

     = 51.67  °C

°C into Kelvin:-

K= °C  + 273

k =  51.67 + 273

   = 324.67 kelvin.

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Material's ability to move through a medium is referred to as its diffusion coefficient. It is determined by the nature of  medium, ion's size, and charge. Cl- ion has greater diffusion coefficient than Fe(CN)₆_₃ ion, which explains why Cl- ion moves faster than Fe(CN)₆_₃ ion.

The migration of ions in a solid is described by the diffusion of ions. It is a slower process that depends on the ion's charge, radius, mobility, and diffusion coefficient. The diffusion of ions is related to the Brownian motion of ions caused by their thermal energy. The smaller ions move quicker and cover a greater distance over time than larger ones, as a result of Brownian motion.

During the diffusion in a solid experiment, Cl ion moved faster and further than Fe(CN)₆ because of the following reasons: The diffusion rate is determined by the ion's charge and size. The rate of diffusion of an ion is directly proportional to the size and inversely proportional to the ion's charge. The Cl ion has a smaller size and a greater charge than the Fe(CN)6 ion.

The diffusion of Cl ion is therefore faster and covers a greater distance than the diffusion of Fe(CN)₆. Cl- ion has a greater diffusion coefficient than Fe(CN)₆_₃ion. A material's ability to move through a medium is referred to as its diffusion coefficient. It is determined by the nature of medium, the ion's size and charge. Cl- ion has greater diffusion coefficient than Fe(CN)₆_₃ ion, which explains why Cl- ion moves faster than Fe(CN)₆_₃ ion.

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The equilibrium concentration of S2−, can be x,x[ S 2 − ]=[ Zn 2 + ]=0.20 MKsp=[Zn2+][S2−]=1.1×10−21=0.20x20x=sqrt(1.1×10−21/0.20)=5.5×10−20 M[Zn2+]=[S2−]=5.5×10−20 MTherefore, the precipitating concentration of ZnS is 5.5 × 10−20 M.

Zinc sulfide is a compound that is colorless, transparent, and refractive. The mineral wurtzite is its most common form, although sphalerite occurs as a red, yellow, greenish, or black color. It is a chemical compound made up of the elements zinc and sulfur, and its chemical formula is ZnS.What is Ksp?Ksp (solubility product constant) is the equilibrium constant for a solid substance dissolving in an aqueous solution. It reflects the degree of saturation of a solution with a solute. For a compound that is ionically dissociated, it is equivalent to the product of the concentrations of the ions, each raised to the power of their stoichiometric coefficient. Zn(NO3)2 is the chemical formula for zinc nitrate. Zinc nitrate is a salt with a colorless or white crystalline appearance that is easily soluble in water and ethanol.What is the formula for Zinc sulfide?ZnS is the chemical formula for zinc sulfide.What is the formula for sulfide?The sulfide ion is a negatively charged polyatomic ion with the chemical formula S2-. It can be made by reacting an acid with a sulfide salt or by reducing sulfur with an appropriate reducing agent.ZnS will precipitate when the ion product is greater than the solubility product constant, which is equal to 1.1 x 10-21. Therefore, let's compute the equilibrium constant for the reaction ZnS(s)⇌Zn2+(aq)+S2-(aq)The equilibrium expression for this reaction isKsp=[Zn2+][S2−]The equilibrium concentration of Zn2+ can be computed from the concentration of Zn(NO3)2:0.20 M Zn(NO3)2⇌0.20 M Zn2+The equilibrium concentration of S2−, can be x,x[ S 2 − ]=[ Zn 2 + ]=0.20 MKsp=[Zn2+][S2−]=1.1×10−21=0.20x20x=sqrt(1.1×10−21/0.20)=5.5×10−20 M[Zn2+]=[S2−]=5.5×10−20 MTherefore, the precipitating concentration of ZnS is 5.5 × 10−20 M.

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Well, look up the atomic weights of copper and oxygen; add them appropriately; divide the total for the copper by the total for the molecule; then multiply by 100 to get it as a percentage.

Answer:

Pb₂O₄

Explanation:

The given species are:

        Pb⁴⁺               O²⁻  

Now, to solve this problem, we use the combining powers which corresponds to the number of electrons usually lost or gained or shared by atoms during the course of a chemical combination.

                                          Pb⁴⁺               O²⁻  

Combining power               4                    2

Exchange of valencies        2                    4

Now the molecular formula is  Pb₂O₄

Answer:

omg my friends name is Noah

Explanation:

THIS IS THE COMPLETE QUESTION BELOW

46.9 gram sample of a substance has a volume of about 3.5 centimeters3. It is solid at a room temperature of 23ºC. Out of the four substances whose properties are given, which is the most likely identity of this substance?

Substance Density (g/cm3) Melting Point (°C) Boiling Point (°C)

molybdenum 10.28 2,623 4,639

mercury 13.53 -39 357

hafnium 13.31 2,233 4,603

lead 11.34 327 1,749

A.

molybdenum

B.

mercury

C.

hafnium

D.

lead

Answer :

The correct option is OPTION C.

(C) Hafnium

Explanation;:

We were given the mass of substance as (m) = 46.9 g

The Volume of substance as (V) = 3.5 Cm^3

But we know Density of substance.= Mass/it's Volume

Then Density=46.9/3.5

=13.4g/Cm^3

From the questionthe given substance is solid at room temperature, and let us take Mercury as an example , Mercury is liquid at room temperature. ThenMercury cannot be the answer.

Base on the determined density which is 13.4 and the density of Hafnium also is 13.31 g/cm3 and it is solid at room temperature. Therefore, Hafnium is the only likely element here.

Precipitates are insoluble ionic solid products of a reaction, formed when certain cations and anions combine in an aqueous solution. The determining factors of the formation of a precipitate can vary.

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass of block = 25 g

volume = 24.5 cm³

The density of the block is

\(density = \frac{25}{24.5} \\ = 1.020408163...\)

We have the final answer as

Hope this helps you

Answer:

7.30g Potassium Chloride (KCl)

Explanation:

You are given 12.0 grams of KClO3, so start with that!

12g KClO3\(\frac{12g KClO3}{ } \frac{1 mol KClO3}{122.55g} \frac{2 mol KCl}{2 mol KClO3} \frac{74.55g KCl}{1 mol KCl} = 7.299877601\)≈7.30

Answer

6.9 x 10¹²Hz

Explanation:

Given parameters:

Wavelength of the wave  = 4.35 x 10⁻⁵m

Unknown:

Frequency of the wave = ?

Solution:

The speed of a wave is related to the wavelength and frequency using the expression below;

          C  = Fλ

C is the speed of light = 3 x 10⁸m/s

F is the frequency

λ  is the wavelength

Insert the given parameters and solve;

      3 x 10⁸  = F x 4.35 x 10⁻⁵

         F  = \(\frac{3 x 10^{8} }{4.35 x 10^{-5} }\)   = 6.9 x 10¹²Hz

Answer:

1.0 g/cm3

Explanation:

yeah that's the density of water

Answer:

a 1 g/cm3

Explanation:

per google- A common unit of measurement for water's density is agram per milliliter (1 g/ml) or 1 gram per cubic centimeter (1 g/cm3)

Answer:

Evaporation

Explanation:

Boiling the water will make it evaporate, leaving the solid at the bottom of the solution

Answer:

The mass of an atom is equal to the protons plus neutrons. Protons and neutrons are particles located inside the nucleus of an atom and give an atom most of it's mass. Therefore, all we need to do is simply add 26+19 to get 45 as the correct answer, making choice 2 correct.

The unit price per ounce is $0.55. The correct option is b. $0. 55

From the question,

We are to calculate the unit price per ounce

First, we will calculate the how many ounces are in 283.5 grams

From the give information,

28.35 g = 1 ounce

∴ 283.5 g = \(\frac{283.5}{28.35}\) ounces

283.5g = 10 ounces

Now,

Since the unit price is 283. 5 grams at $5. 48

That means

The unit price is 10 ounces at $5. 48

Now,

If 10 ounces cost $5.48

Then,

1 ounce will cost \(\frac{\$5.48}{10}\)

1 ounce will cost $0.548 ≅ $0.55

Hence, the unit price per ounce is $0.55. The correct option is b. $0. 55

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The density of tetrahydrofuran needed for a chemistry student to do the experiment is 0.888 g/mL

Tetrahydrofuran has an ethereal smell and is visible as a transparent, colourless liquid. not as dense as water. 6 °F flash point Air is lighter than vapours.

Because it can dissolve different resins even at room temperature and is miscible with water and the majority of organic solvents, THF is frequently employed as a solvent for specialised resins such photosensitive resins. Additionally, it serves as a solvent for Wittig and Grignard processes.

Regardless of the sequence of introduction, if two compounds are totally soluble in one another, they are said to be miscible. Tetrahydrofuran (THF), for instance, and water mix well.

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Answer

                    Explanation:O2 = 1.7×10-3M;

N2 = 6.4×10-3M;

NO = 1.1 10-5M.

To solve this problem, we need to use the equilibrium expression for the base dissociation reaction of pyridine:

C5H5N + H2O ↔ C5H5NH+ + OH-

where Kb is the base dissociation constant for pyridine, defined as:

Kb = [C5H5NH+][OH-]/[C5H5N]

We can use the Kb value to determine the concentration of hydroxide ions produced when pyridine dissolves in water. We can assume that the initial concentration of pyridine is equal to the final concentration of pyridine, since pyridine is a weak base and only partially dissociates in water.

We can also assume that the concentration of hydroxide ions produced is much smaller than the initial concentration of pyridine, so we can neglect its contribution to the total concentration of the solution.

First, we can calculate the concentration of hydroxide ions produced by pyridine:

Kb = [C5H5NH+][OH-]/[C5H5N]

1.7 x 10^-9 = [x][x]/[0.10-x]

where x is the concentration of hydroxide ions produced by pyridine.

Simplifying the expression, we get:

x^2 / (0.10 - x) = 1.7 x 10^-9

Since x is much smaller than 0.10, we can assume that (0.10 - x) is approximately equal to 0.10:

x^2 / 0.10 = 1.7 x 10^-9

Solving for x, we get:

x = sqrt(1.7 x 10^-9 x 0.10) = 1.2 x 10^-5 M

Therefore, the concentration of hydroxide

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26 moles of oxygen (O₂) are required to react completely with 4 moles C₄H₁₀.

In this balanced chemical equation, 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O, the stoichiometric coefficients indicate the molar ratios of reactants and products in the reaction.

To find the number of moles of O₂ needed to react with 4 moles of C₄H₁₀, we can use the stoichiometric coefficients as conversion factors. We see that 2 moles of C₄H₁₀ react with 13 moles of O₂. To find the number of moles of O₂ reacting with 4 moles of C₄H₁₀, we can set up a proportion as follows:

(4 moles C₄H₁₀) × (13 moles O₂ / 2 moles C₄H₁₀)

The "moles C₄H₁₀" units cancel out, leaving us with moles of O₂:

(4 × 13) / 2 = 26 moles O₂

Therefore, 26 moles of oxygen (O₂) are required to react completely with 4 moles of butane (C₄H₁₀).

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Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question we have

\(volume = \frac{112}{13.6} \\ = 8.23529\)

We have the final answer as

Hope this helps you

Answer:

There are 0.0305 calories in 0.128 joules

Explanation:

Given that,

Heat absorbed, Q = 0.128 J

We need to find the heat energy absorbed in calories.

We know that the relation between joules and calories is as follows :

1 calorie = 4.184 J

1 J = (1/4.184) J

So,

\(0.128\ J=\dfrac{0.128 }{4.184}\\\\=0.0305\ cal\)

So, there are 0.0305 calories in 0.128 joules

The answer is D. Sixteenth, since only 1/16 of the original sample remains after 1.0 minute

To solve this problem, we need to use the concept of half-life. The half-life of an isotope is the time it takes for half of a sample to decay.
In this case, the half-life of 20o is 15 seconds. This means that after 15 seconds, half of the sample will have decayed, leaving only half of the original amount. After another 15 seconds (30 seconds in total), half of this remaining sample will decay, leaving only a quarter of the original amount. This process continues every 15 seconds.

To find out what fraction of the sample remains after 1.0 minute (or 60 seconds), we need to determine how many half-lives occur in that time period.
60 seconds divided by 15 seconds per half-life gives us 4 half-lives.

After the first half-life, we are left with half of the original amount. After the second half-life, we are left with a quarter of the original amount. After the third half-life, we are left with an eighth of the original amount. And after the fourth half-life, we are left with a sixteenth of the original amount.

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Answer:

its A

Explanation:

Answer:

Pulmonary circulation.

Explanation:

The question is asking you to identify a process.  The process is pulmonary circulation.  While your blood certainly transports nutrients, water, and waste materials, that answer simply does not match the structure of the question.