Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars a day. The actual process requires water, but a simplified equation is
4Fe(s) + 3O₂(g) → 2Fe₂O₃(s) ΔH = -1.65×10³kJ
(a) How much heat is released when 0.250 kg of iron rusts?

Answer:

Pure copper(II) sulfate is white. It is also known as anhydrous copper(II) sulfate because it has no water in it.

When water is present in a sample of copper(II) sulfate it turns blue. It is still a dry solid, because the individual water molecules are trapped within the ionic lattice surrounding the copper(II) ions. Solutions of copper(II) sulfate are also blue.

This colour change can be used to detect the presence of water (or water vapour).

Answer:

8.24 mL

Explanation:

Density can be defined as mass per unit volume, according to the relationship shown in the attached image. Moles (a unit of measurement for small entities) can also be related to mass. Let's look at two formulas which would be useful for answering this question.

\(\boxed{\text{Density}=\frac{\text{Mass}}{\text{Volume}} }\)

\(\boxed{\text{Mole}\times\text{Mr}=\text{Mass (in grams)}}\) , where Mr stands for relative molecular mass

From the periodic table the Mr of nickel is 58.7.

Multiply the number of moles by the Mr:

Mass of Ni

= 1.25(58.7)

= 73.375 g

Calculate the volume of Ni:

Volume

= mass ÷density

= 73.375 ÷8.90

= 8.24 ml (3 s.f.)

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Answer:

here's your answer...

Explanation:

Full moon, also hey lol.

have a germ-free day.

Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Answer: transporting oxygen-rich blood to the body

Explanation:

Answer:

Fossil fuels are made naturally, however they are considered non-renewable since they take such a long time to form.

Answer: The difference between these 3 isotopes is the number of neutrons.

The atomic mass of an atom is the number of protons plus neutrons. We know that the atomic number of magnesium is 12, so therefore there are 12 protons.

In Magnesium-24, there are 24-12 neutrons = 12 neutrons.

In Magneusium-25, there are 25-12 neutrons = 13 neutrons

In Magnesium-26, there are 26-12 neutrons = 14 neutrons

Answer:

4.1g of Cr will make (317/104) x 4.1 = 12.5g of CrCl3

Answer:

\(\huge\boxed{\sf Atom}\)

Explanation:

Atom:

Element:

\(\rule[225]{225}{2}\)

Answer:

0.3011 X10²³

Explanation:

hope this helps u

Answer:

D.  One variable should change and the others should be kept the same

Explanation:

Variable in an experiment are defined as the things that changes. There are three variables in an experiment: dependent, independent, and controlled.

Independent variable is defined as the variable which is changed by researcher during an experiment and it influence the dependent variable to be changed. Controlled variables are required to be constant in an experiment and observe them carefully.

In an experiment, it is important to change only one variable that is independent variable because changing other variables can make the result confusing and if only one variable will be changed, it would be easy to observe changes in other variables.

Hence, the correct answer is "D.  One variable should change and the others should be kept the same".

The approximate current share price of ABC common stock can be calculated using the dividend discount model. The model takes into account the expected growth rate of earnings and dividends, the discount rate, and the most recent dividend.

The dividend discount model is commonly used to estimate the intrinsic value of a stock based on the present value of its expected future dividends. In this case, we have two years of extraordinary growth followed by a constant growth rate. To calculate the current share price, we need to determine the present value of dividends for the extraordinary growth period and the constant growth period.

First, we calculate the present value of dividends during the extraordinary growth period. We use the formula: Present Value = Dividend / (1 + Discount Rate)^t, where t is the number of years. In this case, we have two years of extraordinary growth, so we calculate the present value of dividends for each year.

Next, we calculate the present value of dividends during the constant growth period using the formula: Present Value = Dividend * (1 + Constant Growth Rate) / (Discount Rate - Constant Growth Rate).

Finally, we sum up the present values of dividends for both periods to obtain the approximate current share price.

Please note that the calculation involves several assumptions and approximations, and it's important to consider other factors and conduct a thorough analysis before making investment decisions.

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Answer:

1.238 years will it take

Explanation:

The isotope decay of an atom follows the equation:

Ln[A] = -kt + ln[A]₀

Where [A] could be taken as the amount of the isotope after t years

[A] = 1.00mg

t = ?

k is the decay constant; k = ln2 / Half-life

k = ln 2 / 2.86 years = 0.2424 years⁻¹

[A]₀ is the initial amount of the isotope = 1.35mg

Replacing:

ln1 = -0.2424years⁻¹*t + ln 1.35

0.2424years⁻¹*t = ln 1.35

t =

Answer:

3

Explanation:

6.07 has 3 digits and all are significant

n specifies B. The energy and average distance from the nucleus, l specifies C. The subshell - orbital shape, ml specifies A. The orbital orientation.

n is known Principal quantum number

l is known Azimuthal quantum number

ml is known Magnetic quantum number

The energy and usual distance from the nucleus are described by the fundamental quantum number, or n.

The subshell and orbit's shape are described by the orbital quantum number, or l.

The orbit's direction is described by the magnetic quantum number, ml.

So, n specifies B. The energy and average distance from the nucleus.

l specifies C. The subshell - orbital shape.

ml specifies A. The orbital orientation.

Thus, n specifies B., l specifies C., ml specifies A.

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In the context of atomic orbital (AO) wavefunctions, the terms "radial node" and "nodal plane" refer to different aspects of the wavefunction's behavior.

A radial node is a region in the AO wavefunction where the probability of finding an electron is zero along the radial direction. In other words, it represents a spherical shell where the electron is unlikely to be found. The number of radial nodes is determined by the principal quantum number (n) of the orbital. For example, the 2s orbital has one radial node, while the 2p orbital has no radial nodes.

On the other hand, a nodal plane is a flat plane within the AO wavefunction where the probability of finding an electron is zero along a particular direction. It represents a surface that divides the orbital into two regions of opposite phases. The number of nodal planes is determined by the angular quantum numbers (l and m) of the orbital. For example, the 2s orbital has no nodal planes, while the 2p orbital has one nodal plane (the xz or yz plane).

Radial nodes arise from the radial part of the wavefunction because they depend on the distance from the nucleus. The radial part determines the distribution of the electron density as a function of distance, and the nodes correspond to regions where the density drops to zero.

On the other hand, nodal planes arise from the angular part of the wavefunction because they depend on the orientation and shape of the orbital. The angular part describes the angular distribution of the electron density around the nucleus, and the nodal planes correspond to regions where the phase of the wavefunction changes sign.

In summary, radial nodes are related to the distance from the nucleus and arise from the radial part of the wavefunction, while nodal planes are related to the orientation and shape of the orbital and arise from the angular part of the wavefunction. The 2s orbital has one radial node and no nodal planes, while the 2p orbital has no radial nodes and one nodal plane.

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When the dry ingredients of a cake are combined, the result is a mixture. Option 3.

In chemistry, mixtures are substances that are obtained by mixing two or more chemically different substances together with each substance maintaining its chemical identity. In other words, the components of a mixture are still chemically unique and can be separated by physical means.

Mixtures can be homogeneous or heterogeneous. Homogenous mixtures are mixtures in which the components are uniformly dispersed throughout the entire mixture. For heterogeneous mixtures, the components are not uniform throughout the mixture.

Thus, when the dry ingredients of a cake, such as flour, sugar, etc., are combined, what we are going to have is a mixture. Whether this mixture would be homogenous or heterogeneous will depend on the level of mixing. Whatever the case may be, the components can still be separated by physical means.

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Answer:

bro Ur in my school lol

Explanation:

Answer:

Explanation:

There will be no attractive or repulsive force between the two types of magnets. its A i took this quiz and got it correct. ^^

Answer:

22.98977 g/

Brainliest please

Answer:

molecular mass if Na  

2

​  

Co  

3

​  

=2×23×12+3×16

=46+12+48

=106

no.of mole =  

molecular wt.

Given wt.

​  

5=  

106

wt

wt=s30

​

Explanation:

Answer:

See explanation

Explanation:

A pure liquid has a sharp boiling point. Now we know that the boiling point of water is 100°C.

If Laura begins to heat each liquid with a thermometer inserted into each liquid, the liquid that boils at exactly 100°C is pure water while the rest are solutions.

Answer:

hydrogen gas

Explanation:

Zn + 2HNO3 ------ Zn(NO3)2 + H2⬆️

Answer:

box a=240, box b= 6, box c=50

Explanation:

The ring rolls slower than the disk when both objects are at rest and roll down a hill together. Option B is correct.

When a ring and a disk roll down a hill together, the ring will roll slower than the disk. This is because the distribution of mass in a ring is different from that of a disk. In a ring, the mass is concentrated towards the outer circumference, while in a disk, the mass is evenly distributed throughout.

As the objects roll down the hill, they convert potential energy into kinetic energy. The rotational kinetic energy of a rolling object depends on its moment of inertia, which is influenced by the mass distribution. Since the mass is concentrated towards the outer circumference of the ring, it has a larger moment of inertia compared to the disk. This higher moment of inertia results in a slower rotation and, therefore, a slower rolling speed for the ring compared to the disk.

Hence, B. is the correct option.

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--The given question is incomplete, the complete question is

"A ring and a disk both at rest roll down a hill together. Which rolls slower? A) disk B) ring C) both roll at the same speed D) not enough information to answer the question."--

In the compound iodine heptafluoride: (hints: write out the molecular formula of this compound before answering the question. Also be sure you clearly understand the concepts of charge, oxidation numbers, how to determine charge and oxidation numbers, and - most important of all! - the similarities and the differences between charges and oxidation numbers)

Each fluorine atom has a charge of 1

The interhalogen compound iodine heptafluoride, often known as iodine(VII) fluoride or iodine fluoride, has the chemical formula IF7.   As anticipated by VSEPR theory, it exhibits a unique pentagonal bipyramidal structure.  The molecule is capable of undergoing the Bartell process, a pseudorotational rearrangement that is similar to the Berry mechanism but for a heptacoordinated system.  It produces colorless crystals that melt at 4.5 °C and have a very narrow liquid range with a boiling point of 4.77 °C. The dense mist has an unpleasant, musty smell. The molecule is symmetrical with D5h. suggestion

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The energy as heat needed to increase the temperature of 0.40 mol of tungsten by 10.0 K is 96.8J.

The energy of a substance can be calculated using the following formula;

Q = mc∆T

Where;

According to this question, the molar heat capacity of tungsten is 24.2 J/K•mol. The energy as heat needed to increase the temperature of 0.40 mol of tungsten by 10.0 K is as follows:

Q = 0.40 × 24.2 × 10

Q = 96.8J

Therefore, 96.8J is the energy of the tungsten metal.

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Answer:

Nucleic acid

Explanation:

Because nucleic acid is the molecule that carries genetic information because it helps to develop or functioning an organism

Answer:

45 °C.

Explanation:

From the question given above, the following data were obtained:

Heat (Q) = 1125 J

Mass (M) = 250 g

Final temperature (T₂) = 55 °C

Specific heat capacity (C) = 0.45 J/gºC

Initial temperature (T₁) =?

The initial temperature of the iron can be obtained as illustrated below:

Q = MC(T₂ – T₁)

1125 = 250 × 0.45 (55 – T₁)

1125 = 112.5 (55 – T₁)

Divide both side by 112.5

1125/112.5 = 55 – T₁

10 = 55 – T₁

Collect like terms

10 – 55 = –T₁

–45 = –T₁

Multiply through by –1

45 = T₁

T₁ = 45 °C

Therefore, the initial temperature of the iron is 45 °C