A copper atom has a mass of 1.06 x 10 g and a penny has a mass of 2.5 g. a Use this information to answer the question below. Be sure your answers have the correct number of significant digits. How many moles of copper atoms have a mass equal to the a mass of a penny?

To answer this question, we need to first write out the balanced chemical equation for the reaction between c₅h₅nh⁺ and oh⁻:

C₅H₅NH⁺ + OH⁻ → C₅H₅N + H₂O

From the equation, we can see that 1 mole of c₅h₅nh⁺ reacts with 1 mole of oh⁻ to produce 1 mole of c₅h₅n.

We are given that 0.00440 moles of c₅h₅nh⁺ and 0.00289 moles of oh⁻ have reacted. We need to determine which of these two reactants is limiting and will be completely consumed in the reaction.

To do this, we can use the mole ratio from the balanced equation.

For every 1 mole of oh⁻, we need 1 mole of c₅h₅nh⁺ to react. Therefore, the maximum number of moles of c₅h₅nh⁺ that can react is 0.00289 moles (since this is the smaller of the two quantities).

Since we know that 1 mole of c₅h₅nh⁺ produces 1 mole of c₅h₅n, we can conclude that 0.00289 moles of c₅h₅n will be produced when the reaction goes to completion.

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Explanation:

(1) 1 m = 100 cm

1.45 m = 100 × 1.45 cm = 145 cm

(2) 1 kg = 1000 g

325 g = 0.325 kg

(3) 1 L = 1000 mL

0.0024 L= 2.4 mL

(4) 1 km = 1000 m

\(1.55\times 10^4\ m=1.55\times 10^4\times 0.001=15.5\ km\)

(5) 1 mm = 0.001 m

\(4.75\times 10^{-2}\ m=4.75\times 10^{-2}\times 1000\ mm\\\\=47.5\ mm\)

(6) 1 kg = 100000 cg

0.459 kg = 45900 cg

(7) 1 dm = 10⁻⁴ dm

5,995 dm = 5,995 × 10⁻⁴ km

(8) 1 g = 1000 mg

450 g = 450000 mg

(9) 1 dm = 100 m

0.003 dm = 0.3 mm

(10) 1 mL = 0.001 l

4.567 × 10⁴ mL = 45.67 L

Solution :

Sir Isaac Newton was a great scientist. The discoveries of the Newton change the way we see the world. Newton gave us the fundamental principles through which the entire universe is governed.

Newtons 1st law of motion states that a body moves or stays in position until and unless an external force is applied to the body.

This is the law of nature.

An example which do not support this law can be a body having a huge mass and a small boy applies force to move it but is unable to move the body.

The season taking place on Earth when it is at position 3 in the diagram is winter.

During position 3, the Northern Hemisphere of Earth is tilted away from the Sun. This tilt causes the Sun's rays to be spread out over a larger area, resulting in less direct sunlight reaching the Northern Hemisphere. As a result, the Northern Hemisphere experiences winter during this time.

In winter, the days are shorter, and the Sun appears lower in the sky. The reduced sunlight and lower angle of the Sun's rays lead to colder temperatures in the Northern Hemisphere. The opposite is true for the Southern Hemisphere, which is tilted towards the Sun and receives more direct sunlight, experiencing summer during this time. The tilt of Earth's axis and its orbit around the Sun cause the changing seasons. As Earth continues its orbit, the tilt gradually changes, leading to different seasons throughout the year.

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Answer:

About 60 grams.  

Explanation:

The on point answer is 61.28 grams.

Owing to the fact that allene is not a planar molecule, the hydrogen atoms in the molecule do not lie on the same plane.

A planar molecule refers to those molecules that lie on same plane. This means that the atoms in the molecules are all arranged along the same plane.

Now we know that the molecule allene is not a planar molecule. Owing to the fact that allene is not a planar molecule, the hydrogen atoms in the molecule do not lie on the same plane. All the carbon atoms present are sp2 hybridized.

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A compound is a special type of molecule where the atoms that form the molecule are of different elements.

Answer:

the fish is the organism that evolved last

Answer:

To communicate with each other

Explanation:

Cows use sound (mooing) to communicate with each other and their environment. Cows are herd animals and have complex social structures. Mooing is one way that they interact and how they express their emotions

Answer:

B

Explanation:

Two quick google searches later I grace you with the google has bestowed upon me

The device that serves the same function as the packing is mechanical seal . Option (c) is correct.

Packing is the most common form of sealing used in controlling devices. A mechanical seal is considered as a method in which fluid is contained in a vessel for example: pumps and mixers, where one rotating shaft passes through one stationary housing. Mechanical seal is of comparatively low cost. These kind of seals lasts longer than packing.

Therefore, mechanical seals are generally preferred over the commonly used traditional packing seals in applications which controls or prevents leakage problems .Some other advantages of  mechanical seals are that these seals are more durable and they use multiple sealing points in order to eliminate any kind of  leakage.

Thus, the correct option is (c)

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Explanation:

\(C_{(s)} + O_{2(g)} \rightleftharpoons CO_{2(g)}\)

According to le ch-atelier's principle when a chemical reaction at equilibrium subjected to any stress, then the equilibrium shifts in that direction in which effect of stress is reduced.

When we would add more number of carbon in above reaction then rate of forward reaction will increase to attain the equilibrium again.

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True. The Balmer series of lines for the hydrogen atom are found only in the visible region of the spectrum.

The Balmer series of lines for the hydrogen atom are found in the visible region of the spectrum because of the specific energy levels that the electrons must be in to emit the visible light that makes up the series [1]. When an electron moves from a higher energy level to a lower energy level, it releases a photon of light with a specific wavelength that is determined by the energy difference between the two levels. This is known as an emission line and the Balmer series is composed of the emission lines that are seen in the visible spectrum.

The Balmer series of lines are the result of electrons transitioning from the n=3 to n=2 energy levels, n=4 to n=2, n=5 to n=2, and n=6 to n=2. Each of these transitions produces a photon of light with a specific wavelength. The exact wavelengths of the Balmer series lines are determined by the Rydberg formula, which uses the atomic mass and the Rydberg constant to calculate the energy levels of the hydrogen atom.

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Let \(E\) be the experimental result and \(T\) be the theoretical result. If the error percentage of the experiment is to be found, the following formula should be used.

The arithmetic mean of \(3\) experiments is taken and accepted as the experimental result. If we put the data into the formula, we find the percentage of error.

According to the percentage of error, this experiment is not accurate.

The error is a means of expressing the accuracy of a measurement. The percentage error is . The correct option is D.

When there occurs a difference between the value of a physical measurement obtained for a person and its true or most probable value, we say that the measurement includes error.

The absolute error is the difference between the observed value and the true or most probable value of the quantity measured.

The percentage error or relative error is the ratio of the error to the true or most probable value. The relative error is more useful than absolute error. It is given as:

ER = x₀ - xₙ / xₙ

x₀ - observed value

xₙ - true value

ER = 2.1 - 2.7 / 2.7

= -22.22 %

The result is not accurate and has -22.22 % error.

Thus the correct option is D.

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Answer:

I think its A. Earths gravity

Explanation:

Hope this answer helps!

At the center of an atom lies a nucleus that is composed of both protons and neutrons. Revolving around the nucleus, in distinct energy levels or shells, are the electrons.

Quantum numbers (n) symbolize energy levels, which are categorized into subshells (s, p, d, f). In accordance with the Aufbau principle, electrons initially fill the energy levels that possess the lowest energy.

Distinct quantities of electrons can be accommodated in every energy level. For instance, the s subshell permits 2 electrons, the p subshell permits 6, the d subshell permits 10, and the f subshell permits 14. The chemical properties and reactivity of an atom are determined by its electron configuration.

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Answer:

12ml per hour and

69% LOL

1) The rate of percolation would be 0.33 ml/s

Percolation rate = volume of water/time

                             =  600/1800s

                              = 0.33 ml/s

2) The percentage of water absorbed would be 40%

Percentage of water absorbed = amount absorbed/total water x 100

                 amount of water absorbed = 100 - 60

                                                      = 40 ml

                  total amount of water = 100 ml

   Percentage of water absorbed = 40/100 x 100

                                                       = 40%

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806.4 milliliters of bromine are required to react completely with 5 grams of 1,2-dimethoxybenzene.

To calculate the number of milliliters of bromine required to react completely with 5 g of 1,2-dimethoxybenzene, we need to determine the molar ratio between bromine and 1,2-dimethoxybenzene, and then convert the mass of 1,2-dimethoxybenzene into moles.

First, let's write the balanced chemical equation for the reaction:

1,2-dimethoxybenzene + Br2 -> 1,2-dibromo-3,4-dimethoxybenzene

From the balanced equation, we can see that 1 mole of 1,2-dimethoxybenzene reacts with 1 mole of bromine.

Next, we need to calculate the number of moles of 1,2-dimethoxybenzene. The molar mass of 1,2-dimethoxybenzene (C8H10O2) is 138.17 g/mol. Using the formula: moles = mass/molar mass, we can calculate:

moles = 5 g / 138.17 g/mol = 0.036 moles of 1,2-dimethoxybenzene

Since the molar ratio is 1:1 between 1,2-dimethoxybenzene and bromine, the number of moles of bromine required will also be 0.036 moles.

Now, we need to convert moles of bromine to milliliters. The molar volume of an ideal gas at standard temperature and pressure (STP) is approximately 22.4 L/mol. This can be converted to milliliters by multiplying by 1000:

22.4 L/mol * 1000 mL/L = 22,400 mL/mol

Finally, we can calculate the number of milliliters of bromine required:

0.036 moles * 22,400 mL/mol = 806.4 mL of bromine

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Sulfate of iron. The elements that make up ferrous sulfate are 36.8% Fe, 21.1% S, and 42.1% O.

To treat and prevent iron deficiency anemia, a drug called ferrous sulfate—sometimes written sulphate—is taken is administered. The body uses iron to strengthen its red blood cells, which carry oxygen throughout the body.

For the treatment of iron-deficiency anemia, you can take ferrous sulfate as an iron supplement. If you don't obtain enough iron from your diet, you could need ferrous sulfate. Ferrous sulfate is available as a pill and a liquid.

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A substitution reaction has two steps, and doubling the concentration of the alkyl halide is found to double the reaction rate. This is a bimolecular SN2 reaction is a false statement.

Substitution reaction is a single step reaction in which one functional group is substitute by another functional group. An example is halogenation reactions, in which a functional group is replaced by a halogen.

Thus, the statement is false.

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The best thing Ka can do next to determine the objectivity of the source is conduct an internet search for cardiac problems + omega-3 fats. Thus option C is correct.

Cardiac problems are defined as the problems that occurs in heart and blood vassals of heart.

The common cardiac problems are

A significant family of polyunsaturated fats is the omega-3 family.

Thus, the best thing Ka can do next to determine the objectivity of the source is conduct an internet search for cardiac problems + omega-3 fats. Thus option C is correct.  

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Answer:

it is A.

Explanation:

determine whether the evidence cited reflects more than one side

Once you have the correct values for pressure, volume, and temperature, follow these following steps to calculate the mass and number of moles of dinitrogen monoxide gas collected.

To calculate the mass and number of moles of dinitrogen monoxide gas collected, we will use the ideal gas law equation:
PV = nRT
where:
P = pressure in the flask
V = measured volume of the flask
n = number of moles of gas
R = ideal gas constant (0.0821 L atm / K mol)
T =temperature in Kelvin
However, the student question did not provide values for the pressure, volume, or temperature. Assuming that you have these values, you can proceed as follows:
1. Convert the given temperature to Kelvin if it's in Celsius (K = °C + 273.15).
2. Plug in the given values for P, V, and T into the ideal gas law equation
3. Solve for n (number of moles):
n = PV / RT
4. Calculate the mass of dinitrogen monoxide (N₂O) gas using the molar mass (44.013 g/mol):
mass = n × molar mass
5. Round your answers to the appropriate significant digits.

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Answer:

Average atomic mass of the  vanadium = 50.9415 amu

Isotope (I) of vanadium' s abundance = 99.75 %= 0.9975

Atomic mass of Isotope (I) of vanadium ,m= 50.9440 amu

Isotope (II) of vanadium' s abundance =(100%- 99.75 %) = 0.25 % = 0.0025

Atomic mass of Isotope (II) of vanadium ,m' = ?

Average atomic mass of vanadium =

m × abundance of isotope(I) + m' × abundance of isotope (II)

50.9415 amu =50.9440 amu× 0.9975 + m' × 0.0025

m'= 49.944 amu

Explanation:

The abundance of the other isotope is 0.25% and the mass of the other isotope is 49.944 amu.

Natural abundance can be described as the abundance of isotopes of a chemical element naturally found on a planet. The relative atomic mass of these isotopes is the atomic weight of the element in the modern periodic table.

The abundance of an isotope can vary from planet to planet but remains relatively constant in time. The natural abundance of an isotope can be affected by the probability of its creation in nucleosynthesis and by the production of a given isotope as a daughter of the natural radioactive isotope.

Given, the average atomic mass of Vanadium = 50.9415 amu

The mass of one isotope = 50.9440 amu, relative abundance =99.75 %.

The relative abundance of the other isotope = 100 - 99.75 = 0.25 %

50.9415  = 50.9440 × 0.9975 + 0.0025 × M

Mass of other isotope = 49.944 amu

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As volume increases, pressure decreases. This can be deduced from the equation above: P1V1 equals P2V2 and so on. P2 = (780 torr)(400 mL) (500 mL) P2 = 780 torr x 400/500 mL/ 624 torr pressure.

As a result, the gas pressure that a gas experiences is equal to the product of the forces the gas molecules exert on the walls of the its container divided by the entire surface area of a container walls.

The force created when gas molecules slam into surfaces of objects produces gas pressure (Figure 1). Even though there is very little force involved in each collision, any surface with a sizeable area is subject to many of them quickly, which can lead to a high pressure.

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When the temperature rises by 1 Kelvin (1K), the response of water vapor is typically an increase in its concentration in the atmosphere. This is because warmer air can hold more water vapor due to its increased capacity to hold moisture.

As the temperature increases, the kinetic energy of water molecules also increases, leading to greater evaporation from liquid water sources such as oceans, lakes, and rivers. This increased evaporation results in an increased amount of water vapor in the air. Water vapor is a greenhouse gas, meaning it has the ability to absorb and emit infrared radiation. As the concentration of water vapor increases in response to rising temperature, it enhances the greenhouse effect, trapping more heat in the atmosphere. This positive feedback loop can further amplify the temperature increase, leading to more evaporation and an even higher concentration of water vapor.

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