Rust has the same properties as iron


True

False

Answer: THE SECONED ONE

Explanation:

\(\large\colorbox{orange}{May Be Helpful ✌️ Dear ✌️}\)\(\large\colorbox{orange}{May Be Helpful ✌️ Dear ✌️}\)

Answer:

Se detailed explanation.

Explanation:

Hello,

In this case, since both magnesium and calcium ions are in group IIA, we can review the following similar properties:

- Since both calcium and magnesium are in group IIA they have two valence electrons, it means that the both of them have two electrons at their outer shells.

- They are highly soluble in water when forming ionic bonds with nonmetals such as those belonging to halogens and oxygen's family.

- Calcium has 18 electrons and magnesium 10 which are two less than the total protons (20 and 12 respectively) since the both of them have lost two electrons due their ionized form.

- Their electron configurations are:

\(Ca^{20}=1s^2,2s^2,2p^6,3s^3,3p^6,4s^2\\\\Mg^{12}=1s^2,2s^2,2p^6,3s^2\)

It means that the both of them are at the \(s\) region since it is the last subshell at which their electrons are.

Best regards.

Answer:

3

Explanation:

This is the answer because when it is full moon the tides are higher.

a) S will be the limiting reagent.

b) 66.24 grams of S₂N₂ can be produced when 1.44 moles of S react with 7.62 moles of N₂.

c) N₂ will be the excess reactant.

In first place, the balanced reaction is:

2 S + N₂ → S₂N₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

S: 2 moles

N₂: 1 mole

S₂N₂: 1 mole

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 1 mole of N₂ reacts with 2 moles of S, 7.62 moles of N₂ reacts with how many moles of S?

moles of S= (7.62 moles of N₂× 2 moles of S)÷1 mole of N₂

moles of S= 15.24 moles

But 15.24 moles of S are not available, 1.44 moles are available. Since you have less moles than you need to react with 7.62 moles of N₂, S will be the limiting reagent. Then, N₂ will be the excess reactant.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 2 moles of S form 92 grams of S₂N₂, 1.44 moles of S form how much mass of S₂N₂?

mass of S₂N₂= (1.44 moles of S×92 grams of S₂N₂)÷ 2 moles of S

mass of S₂N₂= 66.24 grams

Finally, 66.24 grams of S₂N₂ can be produced.

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The term (D) extended structure describes the repeated arrangement of the same molecule.

The extended structure is a type of structure that may be described as one in which the subunits are organized in a pattern that is repeated and occur in a ratio that is constant. Diamond and sodium chloride are two examples of extended structures. Extended structures have well-separated hydrophilic and hydrophobic layers made of propagating chains along the calixarene cavity axis. Therefore, the word "extended structure" is the one that is used to describe the repeating arrangement of the same molecules. So, choice D is the right one.

The correct question is as:

Which term describes the repeated arrangement of the molecule?

A. Bonds

B. Atoms

C. Molecular Model

D. Extended Structure

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Answer:

its A

Explanation:

The only one that makes sense

Answer:

c) H2O and HSO4-

Explanation:

The dehydration of 2-methylcyclohexanol occurs in the presence of H2SO4. Recall that acids are proton donors in solution; the equilibrium shown below is then set up,

H2SO4(aq)  +  H2O(l) ⇄H3O^+(aq) + HSO4^-(aq)

The species H2O and HSO4- are two proton acceptors in the system. According to the Brownstead- Lowry definition, a base is a proton acceptor in solution.

Hence H2O and HSO4- are bases present in the dehydration of 2-methylcyclohexanol.

Answer:

or reactions that are not at equilibrium, we can write a similar expression called the reaction quotient QQQ, which is equal to K_\text cK

c

​

K, start subscript, start text, c, end text, end subscript at equilibrium.

Explanation:

Answer:

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From the given data, the name of the hydrated salt would be  \(CoCl_2.83H_2O\).

The formula of the hydrated salt can be determined using the empirical formula approach. That is, we will find the mole equivalent of the anhydrous salt and the water of hydration and then combine them into a single formula after dividing by the smallest mole.

First, we need to determine the mass of the anhydrous salt and the water of hydration.

Mass of crucible (x) = 12.090 g

Mass of hydrated salt + crucible (y) = 16.250 g

Thus, the mass of the hydrated salt can be determined by subtracting x from y.

Mass of hydrated salt = 16.250 - 12.090 = 4.16 g

Mass of hydrate + crucible after evaporating off the water (z) = 12.424 g

Mass of anhydrous salt = z - x

                                      = 12.424 - 12.090

                                      = 0.334 g

Mass of water = 4.16 - 0.334

                        = 3.826 g

Now, let's find the moles:

Molar mass of \(CoCl_2\) = 129.839 g/mol

Molar mass of water = 18.01 g/mol

Mole of \(CoCl_2\) = 0.334/129.839 = 0.00257 mol

Mole of water = 3.826/18.01 = 0.2124 mol

Dividing through by the smallest mole

\(CoCl_2\) =  0.00257 / 0.00257  = 1

water = 0.2124/ 0.00257 = 83

Thus, the formula of the hydrate would be \(CoCl_2.83H_2O\)

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If the [OH-] concentration is 5.9 x 10^(-M), the pOH of the solution is approximately -4.77 and the solution is basic.

To calculate the pOH of a solution, we can use the formula:

pOH = -log[OH-]

Given that the [OH-] concentration is 5.9 x 10^(-M), we can substitute this value into the formula:

pOH = -log(5.9 x 10^(-M))

Calculating this expression, we find:

pOH = -log(5.9 x 10^(-M))

pOH ≈ -log(5.9) + (-log(10^(-M)))

Since log(10^(-M)) is equal to -M, the equation simplifies to:

pOH ≈ -log(5.9) - M

Now, we need the value of M (the exponent) to calculate the exact pOH value. It appears that the value of M is missing in the given information. However, assuming M is a positive value, we can continue the calculation.

If we consider M = 6, for instance, the equation becomes:

pOH ≈ -log(5.9) - 6

Now, we can evaluate the expression:

pOH ≈ 1.23 - 6

pOH ≈ -4.77

Therefore, if the [OH-] concentration is 5.9 x 10^(-M), the pOH of the solution is approximately -4.77.

To determine whether the solution is acidic, basic, or neutral, we can use the relationship between pH and pOH. The sum of the pH and pOH of a solution at 25°C is always equal to 14.

Since pOH = -4.77, the pH would be:

pH = 14 - pOH

pH ≈ 14 - (-4.77)

pH ≈ 18.77

A solution with a pH above 7 is considered basic. In this case, the calculated pH is greater than 7. Therefore, the solution is basic.

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ANSWER

EXPLANATION

Lithium is a group 1 element with an atomic number of 3

At the neutral state, the number of electrons of an atom is equal to the number of protons of an atom.

Since the atomic number is 3, therefore, the number of protons will be 3

recall, the number of protons is equal to the number of electrons

Hence, the number of electrons is 3

If atoms are neutral, that means that the number of protons and electrons in an atom are equal.

One or more electrons are attached to the nucleus of every atom, which is made up of a nucleus. Protons and neutrons, in various numbers, make up the nucleus. Neutrons exist only in the most prevalent type of hydrogen.

Atoms that are neutral or ionized are the building blocks of all solids, liquids, gases, and plasma. A normal atom is 100 picometers across, which is incredibly small. Because of quantum effects, they are so small that it is impossible to predict their behavior with sufficient precision using classical physics, as if they were, say, tennis balls.

An atom's nucleus makes up more than 99.94% of its mass. The electric charge of the protons is positive, the charge of the electrons is negative, and there is no electric charge on the neutrons.

If atoms are neutral, that means that the number of protons and electrons in an atom are equal. This is because protons carry a positive charge, while electrons carry a negative charge. In order for an atom to be neutral, the number of protons and electrons must be the same, so that the positive and negative charges balance out. Therefore, the number of protons and electrons in an atom should be the same, and the atom is neutral.

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Refer to the attachment

According to the molecular geometry, bonds in carbon tetrachloride are polar and that in nitrogen are non polar.

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.

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Answer:a multiplication

Explanation:

In a dilation, multiplication is the mathematical operation which is used with the scale factor. Thus, the correct option is A.

Dilation is a process of changing the size or the shape of an object by decreasing or increasing its dimensions by some scaling factors.

In mathematics, dilation is a function (f) from a metric space (M) into itself which satisfies the identity (d=rd) for all points x, y \in M, where d is the distance from the points x to y and r is some positive real number. In this, the mathematical operation which is used is multiplication.

Therefore, the correct option is A.

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Answer:

First, we need to convert 0.750 g of lidocaine into milligrams (mg):

0.750 g = 750 mg

Next, we can calculate the total volume of the solution needed to administer 750 mg of lidocaine. Since each 150 mL of the solution contains 500 mg of lidocaine, we can set up the following proportion:

(750 mg) / (500 mg) = (x mL) / (150 mL)

Cross-multiplying:

500x = 750 * 150

500x = 112,500

x = 112,500 / 500

x = 225 mL

Now, we know that it will take 225 mL of the solution to administer 750 mg of lidocaine.

To find the time it takes to infuse 225 mL at a rate of 300 mL/hr, we can set up another proportion:

(225 mL) / (300 mL/hr) = (y min) / (60 min)

Cross-multiplying:

300y = 225 * 60

300y = 13,500

y = 13,500 / 300

y = 45 min

Therefore, it will take 45 minutes to administer 0.750 g (or 750 mg) of lidocaine at a rate of infusion of 300 mL/hr.

It will take approximately 75 minutes for 0.750 g of lidocaine to be administered through the IV at a rate of 300 mL/hr.

To calculate the time it takes to administer 0.750 g of lidocaine, we need to use the information provided.

Given:

Each 150 mL of the solution contains 500 mg of lidocaine.

The rate of infusion is set at 300 mL/hr.

First, we need to determine the amount of lidocaine administered per mL of the solution:

500 mg of lidocaine per 150 mL of solution = 500 mg / 150 mL ≈ 3.33 mg/mL

Next, we can convert the amount of lidocaine to be administered (0.750 g) to milligrams:

0.750 g * 1000 mg/g = 750 mg

Now, we can calculate the total volume of the solution needed to administer 750 mg of lidocaine:

750 mg / 3.33 mg/mL ≈ 225.23 mL

Finally, we can find the time it takes to administer 225.23 mL of the solution at a rate of 300 mL/hr.:

Time (in hours) = Volume (mL) / Rate (mL/hr.)

Time (in hours) = 225.23 mL / 300 mL/hr ≈ 0.75077 hr.

Converting hours to minutes:

Time (in minutes) ≈ 0.75077 hr * 60 min/hr ≈ 45.05 min

Therefore, it will take approximately 75 minutes for 0.750 g of lidocaine to be administered.

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Answer:

b.  1.9 × 10-3

Explanation:

Answer:1.9x10-3

Explanation:

average

The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.

To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.

Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):

K2S -> 2K+ + S2-

Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):

MgI2 -> Mg2+ + 2I-

Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):

K+ + I- -> KI

Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):

Mg2+ + S2- -> MgS

Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:

2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS

To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).

Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:

S2- + Mg2+ -> MgS

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A pressure of 12.5 atm is required to pop a kernel of popcorn. It's worth noting that this is a very high pressure, and it's the build-up of this pressure that causes the kernel to "pop".

To calculate the pressure required to pop a kernel of popcorn, we need to use the ideal gas law, which relates the pressure (P), volume (V), temperature (T), and number of moles of gas (n) in a system:

PV = nRT

Where R is the universal gas constant. We can assume that the temperature inside the popcorn kernel just before it pops is the same as the temperature in the microwave (100°C or 373 K). We also know that the only gas inside the kernel is water vapor, which has a molecular weight of 18 g/mol.

To calculate the number of moles of water vapor that is produced during the popping of the kernel, we can use the mass of water in the popcorn:

n = m/M

Where m is the mass of water (16.7 g) and M is the molar mass of water (18 g/mol). This gives us:

n = 16.7 g / 18 g/mol = 0.9286 mol

Now we can rearrange the ideal gas law to solve for pressure:

P = nRT / V

Substituting the known values, we get:

P = (0.9286 mol)(0.0821 Latm/molK)(373 K) / 3.1 L

P = 12.5 atm

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Answer:

D.

Explanation:

Answer:

Energy per mole of photons = 2.31 × 10^2 KJ/mol

Explanation:

Energy, E = hf;

Where h is Planck's constant = 6.63 ×10^-34, and f is frequency of the photons.

E = 6.63 × 10^-34 × 5.8 × 10^14

E = 3.84 × 10^-22 KiloJoules

I mole of photons contains Avogadro's number of particles, 6.02 × 10^23

Therefore, the energy per mile of photon is 3.84 × 10^-22 KJ × 6.02 × 10^23

Energy per mile of photon = 2.31 × 10^2 KJ/mol

Answer:

the answer is copper pipe

When fossil fuels burn, several forms of energy are produced, including:

Heat energy: The primary form of energy released during fossil fuel combustion is heat. Fossil fuels contain chemical energy stored for millions of years, and when they burn, this energy is released in the form of heat. The heat energy can be harnessed for various purposes, such as heating buildings or generating steam to drive turbines.

Light energy: Burning fossil fuels can also produce light energy in the form of flames or glowing embers. This light energy is a byproduct of combustion.

Mechanical energy: Heat generated by burning fossil fuels can be converted into mechanical energy. This is typically achieved by using heat to produce steam, which drives a turbine connected to a generator. The rotating turbine converts the heat energy into mechanical energy, which is further transformed into electrical energy.

Electrical energy: Through the process described above, burning fossil fuels can ultimately generate electrical energy. The mechanical energy produced by the turbine is converted into electrical energy by the generator. Electrical energy can power various devices, appliances, industries, and infrastructure.

It's critical to note that while burning fossil fuels can produce useful forms of energy, it also results in the release of carbon dioxide and other greenhouse gases. This contributes to climate change and environmental concerns. As a result, there is a global shift towards cleaner and renewable energy sources to mitigate these negative impacts.