What has 146 neutrons.

To get the bottom of the meniscus to the volumetric line of the pipette, tilt the pipette slowly and gently while keeping the top of the meniscus level. Make certain that you are gazing at the meniscus at eye level. Finally, add or subtract liquid as needed until the bottom of the meniscus reaches the volumetric line.

Follow these steps to get the bottom of the meniscus to the volumetric line of the pipette:

Fill the pipette with the liquid to be measured by dipping the tip of the pipette in the liquid and bringing it up to the required volume.

Hold the pipette upright and gently pour the liquid out until the meniscus (the curved surface of the liquid) is slightly above the pipette's calibration point.

To adjust the meniscus, use a clean and dry dropper to add or withdraw tiny drops of liquid from the pipette until the meniscus's bottom is at the pipette's calibration mark.

To maintain precision, hold the pipette upright during this operation and add or withdraw the liquid drop by drop.

Once the meniscus has reached the calibration point, you can transfer the liquid to the container of your choice or take any necessary measurements.

When correcting the meniscus, precision is essential since even little deviations might lead to erroneous results. It is also critical to use the correct pipette for the liquid being measured and to follow any special instructions or protocols supplied by your laboratory or project.

For more such questions on pipette, click on:

https://brainly.com/question/13273684

#SPJ4

Answer:

2.18 grams of Br2 reacts to produce 3.25 grams of KBr

Explanation:

The balanced equation is

2 KI + Br2 → 2 KBr + I2

2 moles of KI and 1 mole of Br2 reacts to produce two molecules of KBr

Mass of two moles of KI = 2 * 166 grams

Mass of one mole of Br2 = 159.808 grams

Mass of two moles of KBr = 2* 119 grams

Thus,  159.808 grams of Br2 reacts to produce 2* 119 grams of KBr

2.18 grams of Br2 reacts to produce {(2* 119)/ 159.808} * 2.18 grams of KBr

2.18 grams of Br2 reacts to produce 3.25 grams of KBr

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 \(NH_{3}\).

Know more about Le Chatelier's principle here:

https://brainly.com/question/2943338

#SPJ8

Answer:

This is a fusion process.

This is a fission process.

Explanation:

Select the statements that are correct regarding this reaction.

This is a fusion process.

This is a fission process.

The mass of the products is exactly equal to the reactants.

Only the number of particles of product equals the number of particles of reactants.

Could be more than one answer

Hydrogen 1 + Lithium 7 yields 2 Helium 4 plus energy

you have merged hydrogen 1  with Lithium 7 to produce a temporary berylium8, so it is fusion, because you are fusing the particles together.

the energy of the impact of the hydrogen on the lithium

causes the temporary berylium 8 to split into 2 helium atoms, so it is then fission, because you are splitting an atom of berylium8.

the mass of the reactants and products are not equal, because some of the energy comes from conversion of the reactant mass to energy by E=mcc

The number of reactant particles does equal the number of product particles, bute answer says ONLY which is not correct

In the given reaction, The mass of the products is exactly equal to the reactants. However this a radioactive  process where, lithium and hydrogen react together forming two helium nuclei.

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the total mass of a system is conserved. In a closed system the mass cannot be lost.

For a chemical reaction, new products are formed by regrouping of atoms from the reactants where no new atom is produced not any lost. Hence, the total mass in the reactant side will be equal to the total mass in the product side.

In the given reaction the number of particles are equal in both side as well mass too equal in both side. The total mass in reactant side and product side is 8.

To find more on mass conservation, refer here:

https://brainly.com/question/14549722

#SPJ2

Answer:

The volume of hydrogen gas produced at s.t.p. is 9.419 dm³

Explanation:

The balanced chemical equation for the reaction is given as follows;

Zn + 2HCl → ZnCl₂ + H₂

Therefore, we have;

One mole of Zn reacts with 2 moles of HCl to produce one mole of ZnCl₂ and one mole of H₂

Number of moles of Zn present = 25/65 = 5/13 = 0.385 moles

Therefore, number of moles of H₂ produced = 0.385 moles

The volume of hydrogen gas produced is given by the relation

PV = nRT, we have;

R = 8.3145 J/(mol·K)

V = nRT/P = 0.385 ×8.3145 ×298.15/(101325)= 0.009419 m³ = 9.419 dm³

The volume of hydrogen gas produced at s.t.p. = 9.419 dm³.

Answer:

15×108 cm3

Explanation:

#CarryOnLearning

The amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

To calculate the molarity of Kool Aid desired, we need to determine the number of moles of Kool Aid powder and sugar in the package. Since the molecular formula for sugar is C12H22O11, we can calculate its molar mass as follows:

Molar mass of C12H22O11 = (12 * 12.01) + (22 * 1.01) + (11 * 16.00)

= 144.12 + 22.22 + 176.00

= 342.34 g/mol

Given that the package contains 4.25 grams of Kool Aid powder, we can calculate the number of moles of Kool Aid powder using its molar mass:

Number of moles of Kool Aid powder = Mass / Molar mass

= 4.25 g / 342.34 g/mol

≈ 0.0124 mol

Similarly, for the sugar, which has a molar mass of 342.34 g/mol, we can calculate the number of moles of sugar using its mass:

Number of moles of sugar = Mass / Molar mass

= 192.00 g / 342.34 g/mol

≈ 0.5612 mol

Now, to calculate the molarity of the desired Kool Aid solution, we need to determine the volume of water. Given that 1.06 quarts is equal to 1 liter, and we have 2.00 quarts of water, we can convert it to liters as follows:

Volume of water = 2.00 quarts * (1.06 liters / 1 quart)

= 2.12 liters

To find the molarity, we use the formula:

Molarity (M) = Number of moles / Volume (in liters)

Molarity of Kool Aid desired = (0.0124 mol + 0.5612 mol) / 2.12 L

≈ 0.286 M

To prepare 65 mL of the desired molarity, we can use dilution calculations. We need to determine the volume of concentrated solution and the volume of water needed.

Let's assume the concentration of the concentrated Kool Aid solution is C M. Using the dilution formula:

(C1)(V1) = (C2)(V2)where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given that C1 = C M and V1 = V mL, and we want to prepare a final volume of 65 mL (V2 = 65 mL) with a final concentration of 0.286 M (C2 = 0.286 M), we can rearrange the formula to solve for the volume of the concentrated solution:

(C M)(V mL) = (0.286 M)(65 mL)

V mL = (0.286 M)(65 mL) / C M

So, the amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

For more such questions on concentrated visit:

https://brainly.com/question/28564792

#SPJ8

The Spanish group settled territory mainly along the western coast of South America.

According to the provided information, the Spanish territories encompass Mexico, Central America, and half of South America. Since the question asks about the group that settled mainly along the western coast of South America, the answer is the Spanish. The Spanish colonization efforts extended from present-day Mexico down the western coast of South America, including countries such as Colombia, Ecuador, Peru, and Chile. They established various colonies and dominions along this western coastline, including important cities like Lima, Quito, and Santiago. The Spanish presence and influence were significant in shaping the culture, language, and history of these regions in South America.

Learn more about  Spanish group here;

https://brainly.com/question/32041539

#SPJ11

Mg

...

.....

......

..............

Answer:

c and d

Explanation:

the others contain red and blue, c and d contain only one color, therefore meaning there's only one type of atom in them :)

The values t = 13.2 days and ln(1/2) ≈ -0.6931, we can calculate the half-life of the radioisotope using the above formula.To determine the half-life of the radioisotope, we can use the formula for exponential decay.

N(t) = N₀ * (1/2)^(t / T₁/₂), where: N(t) is the quantity of the radioisotope at time t, N₀ is the initial quantity of the radioisotope, t is the elapsed time, T₁/₂ is the half-life of the radioisotope. Given that 4.1 half-lives correspond to 13.2 days, we can set up the equation as follows: (1/2)^(4.1) = N(t) / N₀ = e^(-t / T₁/₂), where e is the base of natural logarithm. Solving for T₁/₂, we have: T₁/₂ = -t / (4.1 * ln(1/2)).

Substituting the values t = 13.2 days and ln(1/2) ≈ -0.6931, we can calculate the half-life of the radioisotope using the above formula.

To learn more about half-life click here: brainly.com/question/24710827

#SPJ11

Answer:

Volume = 190.8

◆ Atomic mass of carbon (C) = 12g

◆ Atomic mass of oxygen (O) = 16g

= 3.57

= 3.57

Simplest ratio :-

= 3.57 : 3.57

= 1 : 1

Empirical Formula = CO

Answer:

balance

Explanation:

Answer:

Because the sun is low on the horizon, sunlight passes through more air at sunset and sunrise than during the day, when the sun is higher in the sky. More atmosphere means more molecules to scatter the violet and blue light away from your eyes.

a) We have a Fe ion with a positive charge +2, therefore we will also have a Fe ion with a +3 charge.

The charge difference is +1, this means that the Fe3+ ion gained an electron, therefore 1 must be put in front.

b) Now, in the second reaction we have 4 oxygens in the reactants and one in the products, so we put the coefficient 4 in front of H2O and thus we will have 4 oxygens in the products.

Now it would be necessary to balance the hydrogens, we have 8 hydrogens in the products and 1 in the reactants, so we put the coefficient of 8 in front of the hydrogen

Now the Mn, there is an atom of Mn in the reactants, the coefficient 1 is placed in front of the Mn+2.

So far the balanced reaction will go like this:

We need to balance the electrons. For that, we see what is the oxidation state of Mn in the molecule MnO4-. Oxygen has an oxidation state of -2.:

The oxidation state in the MnO4 molecule is +7, therefore it must gain 5 electrons to be left with a +2 charge.

And so we have the balanced equation.

Habitat preservation is usually the most efficient method of protecting biodiversity because it involves protecting an entire ecosystem.

The natural world provides a variety of resources that can be taken advantage of for financial gain, such as timber taken from forests and clean water taken from streams and hence the entire ecosystems preservation.

However, anthropogenic economic growth-related land expansion frequently results in a decrease in the ecological integrity of neighboring natural habitat.

A management strategy known as habitat conservation aims to preserve, maintain, and restore habitats in order to stop the extinction, fragmentation, or range reduction of species. It is a focus of numerous groups that is difficult to categorize in terms of a single ideology.

For instance in tropical regions with a high species richness or in leisure activities like hiking and mountain biking that take place in undeveloped areas. Repairing harmed ecosystems is thought to be substantially more valued.

To find more on ecosystems, refer here:

https://brainly.com/question/13979184

#SPJ6

Answer:

2.23L

Explanation:

Using the general gas law as follows:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas constant (0.0821 Latm/molK)

T = temperature (K)

According to the information provided in this question,

Mass of nitrogen = 2800mg

Since 1g = 1000mg

2800mg = 2800/1000

= 2.8g

Using mole = mass ÷ molar mass

Molar mass of nitrogen gas (N2) = 28g/mol

mole = 2.8/28

mole of N2 gas = 0.1mol

Pressure = 98kPa

1 kilopascal (kPa) = 1000pascal (pa)

98kPa = 98 × 1000

= 98000pascal

Since 1 Pascal = 9.869 × 10^-6 atmosphere (atm)

98000pascal = 98000 × 9.869 × 10^-6

= 0.967atm

Temperature = -10°C

Kelvin = °C + 273

Kelvin = -10 + 273

K = 263K

Hence, using PV = nRT

0.967 × V = 0.1 × 0.0821 × 263

0.967V = 2.159

V = 2.159/0.967

V = 2.23

Volume of Nitrogen gas = 2.23 L

The value of Y in the formula when 2.8g of silicon react with 3.2g of oxygen, is 2

The numbers in the formula of a compound determine the ratio of moles of each element in the compound.

Given:

2.8g of silicon

3.2g of oxygen

[relative atomic mass of silicon is 28 and of oxygen is 16]

For silicon, n = 2.8 ÷ 28 = 0.1    (n= moles)

For oxygen, n = 3.2 ÷ 016 = 0.2

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.1 moles.

For Silicon = 0.1/0.1 = 1

For Oxygen = 0.2/0.1 = 2

Taking the mole ratio as their subscripts.

The ratio of Si:O is 1:2

SiO\(_{2}\) is the formula of silicon dioxide.

The value of y in the formula SiO\(_{Y}\) is 2 when 2.8g of silicon react with 3.2g of oxygen.

To know more about moles, click on this link

https://brainly.com/question/22540912

Answer:  A change in the first second and third

Explanation:

An electron in the lowest energy state is called as ground state and is also known as stable energy level.  An electron in the upper energy state is called as excited state and is also known as unstable energy level.

Electronic configuration represents the total number of electrons that a neutral element contains. The electrons are filled according to Afbau's rule in order of increasing energies. As the atomic number of sodium is 11. The electronic configuration of sodium will be represented in ground state as:

\(Na:11:1s^22s^22p^63s^1\)

Thus any electron if occupies a higher shell, the atom is said to be in excited state.

The error which lead to a molarity that is too high or too low is because of the difference in actual mass of the NaOH than the calculated mass.

Hygroscopic refers to the property of a substance that attracts water molecules from the surrounding atmosphere. Sodium hydroxide is a hygroscopic substance, which is why it is suggested to keep the bottle of sodium hydroxide covered to prevent contact with air.

If you use the mass of NaOH to determine the molarity of the solution, an error will occur in the calculated molarity. Standardization of the solution is essential to avoid errors while determining the molarity of a solution. It is necessary to standardize NaOH because it is hygroscopic and can absorb moisture from the atmosphere during the preparation of the solution.

The error that will occur if the mass of NaOH is used to determine the molarity of the solution instead of standardizing the solution is that it will lead to a molarity that is too high. This is because the actual mass of NaOH will be less than the calculated mass. The calculated molarity will be high because the calculated mass is less than the actual mass. This can lead to inaccurate results and affect the reaction that is taking place. Therefore, it is necessary to standardize the solution to get accurate results.

Learn more about Hygroscopic compound here:

https://brainly.com/question/13545535

#SPJ11

Answer:

the other person is right

Explanation:

they're also wrong

Answer:

58% or 55.34%

Explanati

Answer:

its B

Explanation:

I took the test and its that passage way thing. (tell me if this works for you! it will but just wanna make sure!)

The molar entropy of vaporization (∆Svap) for chloroform is 0 J/mol·K. To calculate the molar entropy of vaporization (∆Svap) for chloroform (CHCl₃), we can use the Clausius-Clapeyron equation.

The Clausius-Clapeyron equation relates the vapor pressure, temperature, and enthalpy of vaporization. The equation is as follows:

ln(P₂/P₁) = (∆Hvap/R) * (1/T₁ - 1/T₂)

Where:

P₁ and P₂ are the initial and final vapor pressures, respectively.

T₁ and T₂ are the initial and final temperatures, respectively.

∆Hvap is the enthalpy of vaporization.

R is the ideal gas constant.

We need to rearrange the equation to solve for ∆Svap:

∆Svap = (∆Hvap/R) * (1/T₁ - 1/T₂)

We know that

∆Hvap = 31.4 kJ/mol

T₁ = boiling point of chloroform = 61.7°C = 334.85 K (convert to Kelvin)

T₂ = boiling point of chloroform = 61.7°C = 334.85 K (same as T₁)

R = 8.314 J/mol·K (ideal gas constant)

Substituting the values into the equation, we can calculate the molar entropy of vaporization (∆Svap):

∆Svap = (31.4 kJ/mol / 8.314 J/mol·K) * (1/334.85 K - 1/334.85 K)

∆Svap = (31.4 kJ/mol / 8.314 J/mol·K) * 0

∆Svap = 0

Learn more about molar entropy https://brainly.com/question/32107086

#SPJ11

Answer: The circulatory system.

Explanation: The circulatory system, which is part of the "cardiovascular" system, is one of the eleven organ systems of the human body. Its main function is to transport nutrients to cells and wastes from cells (Figure 3.4. 1). This system consists of the heart, blood, and blood vessels.

The blood cells carry nutrients from food to the rest of the cells in the body.

The human circulatory system moves important nutrients and minerals throughout the body and metabolic waste products out from the body. The human circulatory system contains blood, blood vessels, heart, and lymph.

The human circulatory system provides essential nutrients, minerals, oxygen, and hormones to different parts of the body and is responsible for collecting toxins from the cells and tissues to be purified or eliminated from the body.

The human circulatory system contains a wide network of blood vessels. These constitute arteries, veins, and capillaries. The primary function of blood vessels is to transport nutrients and oxygenated blood to all parts of the body.

The Circulatory system helps in sustaining all the organ systems and transports blood, nutrients, oxygen, and hormones throughout the body. It secures cells from pathogens and acts as an interface for cell to cell interaction.

Learn more about the Circulatory system, here:

https://brainly.com/question/10103458

#SPJ2

Answer:

10.554 amu

Explanation:

X1 has 10 amu with 72.3%

X2 has 12 amu with 100 - 72.3 = 27.7%

So average mass = 10(72.3%) + 12(27.7%)

= 10(0.723) + 12(0.277)

= 7.23 + 3.324

= 10.554 amu

Answer:

C- transforemed or changed

Explanation:

matter can be changed by application of heat or cold

Answer:

Final temperature = 149 K

Explanation:

Given data:

Initial temperature = 25°C (25+273 = 298 K)

Initial volume = 4.5 L

Final temperature = ?

Final volume = 9.0 L

Solution:

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

T₂ = T₁V₂/V₁  

T₂ = 4.5 L × 298 K / 9.0 L

T₂ = 1341 L K / 9.0L

T₂ = 149 K