What is the molarity of a solution prepared by dissolving 7.0 moles of NaCl solute in 585 ml of solution
?

Answer:

This law states that the volume and temperature of a gas have a direct relationship: As temperature increases, volume increases, when pressure is held constant. Heating a gas increases the kinetic energy of the particles, causing the gas to expand.

Explanation:

Considering the Charles's law and STP conditions, the volume of the gas at standard temperature is 12.61 L.

Charles's law establishes the relationship between the volume and temperature of a gas sample at constant pressure.

This law says that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. That is, the volume is directly proportional to the temperature of the gas.

Mathematically, Charles's law states that the ratio between volume and temperature will always have the same value:

\(\frac{V}{T} =k\)

Considering an initial state 1 and a final state 2, it is fulfilled:

\(\frac{V1}{T1} =\frac{V2}{T2}\)

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C (or 273 K) are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

In this case, you know:

Replacing in the definition of Charles's law:

\(\frac{13.4 L}{290 K} =\frac{V2}{273 K}\)

Solving:

\(V2= 273 K\frac{13.4 L}{290 K}\)

V2= 12.61 L

Finally, the volume of the gas at standard temperature is 12.61 L.

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defective greatest formerly knows sd ghost;

Hydrolysis is a chemical reaction in which a compound reacts with water, leading to the decomposition or breakdown of the compound into its constituent molecules or ions. 2-Methyl-2-butene, are three examples of alkenes that, upon hydrolysis, can produce 2-methyl-2-butanol, 3-Methyl-1-butene, and, 1-Methylcyclobutene.

To determine the different alkenes that can be hydrolyzed to form 2-methyl-2-butanol, we need to consider the possible alkene structures that can be rearranged through hydrolysis.

To identify the alkenes that can be hydrolyzed to form this product, we need to consider the possible alkene structures that can undergo the necessary rearrangements. Here are three different alkenes that can be hydrolyzed to form 2-methyl-2-butanol: 2-Methyl-2-butene, 3-Methyl-1-butene, and 2-Methyl-1-butene.

Therefore, 2-Methyl-2-butene, are three examples of alkenes that, upon hydrolysis, can produce 2-methyl-2-butanol, 3-Methyl-1-butene, and, 2-Methyl-1-butene.

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The complete string representing the order of orbital filling without blank spaces is: \(1s^22s^22p^63s^23p^64s^23d^1{0}4p^65s^24d^105p^66s^24f^145d^{10}6p^67s^25f^146d^{10}7p^6\)

To express the order of orbital filling as a string without blank spaces, we follow the Aufbau principle, which states that electrons fill orbitals starting from the lowest energy level and move upward. The order of orbital filling is as follows:\(1s^22s^22p^63s^23p^64s^23d^1{0}4p^65s^24d^105p^66s^24f^145d^{10}6p^67s^25f^146d^{10}7p^6\)

Let's break it down step by step:

1s^2: The 1s orbital can hold up to 2 electrons.

2s^2: The 2s orbital can also hold up to 2 electrons.

2p^6: The 2p orbitals can hold up to 6 electrons.

3s^2: The 3s orbital can hold up to 2 electrons.

3p^6: The 3p orbitals can hold up to 6 electrons.

4s^2: The 4s orbital can hold up to 2 electrons.

3d^10: The 3d orbitals can hold up to 10 electrons.

4p^6: The 4p orbitals can hold up to 6 electrons.

5s^2: The 5s orbital can hold up to 2 electrons.

4d^10: The 4d orbitals can hold up to 10 electrons.

5p^6: The 5p orbitals can hold up to 6 electrons.

6s^2: The 6s orbital can hold up to 2 electrons.4f^14:

The 4f orbitals can hold up to 14 electrons.

5d^10: The 5d orbitals can hold up to 10 electrons.

6p^6: The 6p orbitals can hold up to 6 electrons.

7s^2: The 7s orbital can hold up to 2 electrons.

5f^14: The 5f orbitals can hold up to 14 electrons.

6d^10: The 6d orbitals can hold up to 10 electrons.

7p^6: The 7p orbitals can hold up to 6 electrons.

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Answer:

C

Explanation:

Fluorine has a smaller atomic radius than oxygen.

Answer:

About 28.9 kJ.

Explanation:

Recall the formula for specific heat:
\(\displaystyle q = mC\Delta T\)

Where q is the amount of heat released, m is the mass of the substance, C is its specific heat, and ΔT is the change in temperature.

Therefore, by substitution, we have that:
\(\displaystyle \begin{aligned} q & = (625\text{ g})\left(\frac{0.900 \text{ J}}{\text{g-$^\circ$C}}\right)\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right) \left(82.1^\circ\text{C}-30.7^\circ \text{C}\right) \\ \\ & = (625\text{ g})\left(\frac{0.900 \text{ J}}{\text{g-$^\circ$C}}\right)\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right)(51.4^\circ\text{C}) \\ \\ & = 28.9\text{ kJ}\end{aligned}\)

In conclusion, about 28.9 kJ of energy is needed.

The energy of a photon can be calculated by multiplying Planck's constant by the frequency of the light.

According to this question, the relationship between the energy of a photon and the frequency of light was determined by Ernst Planck. He proposed a equation as follows:

E = hf

Where;

The energy of a frequency 4.0 × 10¹⁴ Hz can be calculated as follows:

E = 6.626 × 10-³⁴ × 4 × 10¹⁴

E = 2.65 × 10-¹⁹J

λ = hc/E

λ = 6.626 × 10-³⁴ × 3 × 10⁸/2.65 × 10-¹⁹

λ = 1.988 × 10-²⁵/2.65 × 10-¹⁹

λ = 7.5 × 10-⁷m

Therefore, 7.5 × 10-⁷m is the wavelength of the photon.

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ANSWER

EXPLANATION

Given that

The number of moles lithium bromide is 5.5 moles

Firstly, write a balanced equation for the reaction

Find the number of moles of bromine using stoichiometry ratio

Let x represents the number of bromine

a) To solve for the k value in the equation T(t) = 70 + 142ekt, we can use the given information that the coffee temperature at 10 minutes was 110°F.

Substituting t = 10 and T(t) = 110 into the equation, we have:110 = 70 + 142ek(10). Subtracting 70 from both sides, we get: 40 = 142ek(10). Dividing both sides by 142, we have: ek(10) = 40/142. Taking the natural logarithm (ln) of both sides, we get: ln(ek(10)) = ln(40/142). Simplifying, we have: k(10) = ln(40/142). Dividing both sides by 10, we get: k = ln(40/142) / 10. Using a calculator, we find that k ≈ -0.0131. b) To find T(t) at 19.5 minutes, we can substitute t = 19.5 into the equation T(t) = 70 + 142ekt: T(19.5) = 70 + 142e(-0.0131)(19.5) Using a calculator, we can evaluate the expression to find T(19.5) ≈ 99.6°F. a) The decay of Lidocaine can be modeled using the equation L(t) = aekt. Given that the half-life of Lidocaine is about 1.5 hours, we can use this information to solve for the k value. Using the half-life formula, we know that: t1/2 = (ln 2) / k. Substituting t1/2 = 1.5 hours, we have: 1.5 = (ln 2) / k. Solving for k, we get: k = (ln 2) / 1.5. Using a calculator, we find that k ≈ 0.4621. b) The exponential model for Lidocaine decay is given by : L(t) = aekt. c) To find how long it will take for the amount of Lidocaine to reduce to 20 mg, we can substitute L(t) = 20 and solve for t. 20 = 200e0.4621t. Dividing both sides by 200, we have: 0.1 = e0.4621t. Taking the natural logarithm (ln) of both sides, we get: ln(0.1) = 0.4621t. Simplifying, we have: t = ln(0.1) / 0.4621. Using a calculator, we find that t ≈ 2.7 hours. Rounded to the tenths, it will take approximately 2.7 hours for the amount of Lidocaine to reduce to 20 mg.

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Answer:

B (40º c)

Explanation:

Rubidium being silvery-white and melting at 39 ºC. Which means 40º C is the closest.

Answer: C

Explanation: because Pangaea broke apart and made smaller continents.

(a) Balanced net ionic equation: Cr³⁺(aq) + 3CO₃²⁻(aq) → Cr₂(CO₃)₃(s); spectator ions: 2NH₄⁺(aq) and 3SO₄²⁻(aq).

(b) Balanced net ionic equation: Ag+(aq) + SO₄²⁻(aq) → Ag₂SO₄(s); spectator ions: K⁺(aq) and NO₃⁻(aq).

(c) Balanced net ionic equation: Pb²⁺(aq) + 2OH⁻(aq) → Pb(OH)₂(s); spectator ions: 2K⁺(aq) and 2NO₃⁻(aq).

(a) To write the balanced net ionic equation for the reaction between Cr₂(SO₄)₃ and (NH₄)₂CO₃, we first need to write the complete ionic equation:

Then, we eliminate the spectator ions (NH₄⁺ and SO₄²⁻) to get the net ionic equation:

(b) For the reaction between AgNO₃ and K₂SO₄, the complete ionic equation is:

Eliminating the spectator ions (K⁺ and NO₃⁻) gives the net ionic equation:

(c) Finally, for the reaction between Pb(NO₃)₂ and KOH, the complete ionic equation is:

Eliminating the spectator ions (K⁺ and NO₃⁻) gives the net ionic equation:

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The molarity of NaOH is \(0.24009 \mathrm{M}$\).

This is the formula for molarity:

\(\text { molarity of } \mathrm{NaOH}=\frac{\text { number of moles of } \mathrm{NaOH}}{\text { volume of } \mathrm{NaOH} \text { solution }(\mathrm{L})}$$\)

First, we need to find the number of moles of \($\mathrm{NaOH}$\) :

\($K H P$\) being "monoprotic" mean s that one mole of KHP is one equivalent. Basically, 1 molecule of KHP only donates \($1 H^{+}$\) ion.

We also know that\($\mathrm{NaOH}$\) is a monoprotic base, because there's only one \($\mathrm{OH}^{-}$\) ion in its chemical formula.

Therefore, 1 mole of KHP will correspond to 1 mole of \($\mathrm{NaOH}$\) in a neutralisation reaction.

In other words, 1 mole of \($\mathrm{NaOH}$\) will neutralise 1 mole of \($\mathrm{KHP}$\).

The number of moles of KHP that was neutralised was:

\($\frac{1.25}{39.098+1.008+8 \times 12.01+4 \times 1.008+4 \times 16}$\)

= 0.00612 moles

Because the mole ratio of K H P to N a O H is 1 : 1 , 0.00612moles of N a O H must have neutralised 0.00612 moles of K H P .

Then, we need to find the volume of the N a O H solution. This is pretty simple, actually, because it was given to us in the question: 28.05  mL , or 0.02549 L .

Finally, we just need to plug these values into the formula for molarity:

molarity of \($\mathrm{NaOH}=\frac{\text { number of moles of } \mathrm{NaOH}}{\text { volume of } \mathrm{NaOH} \text { solution }(\mathrm{L})}$\)

molarity of \($\mathrm{NaOH}=\frac{0.00612 \mathrm{~mol}}{0.02549 \mathrm{~L}}$\)

molarity of \($\mathrm{NaOH}=0.24009 \mathrm{M}$\)

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Answer:

The stability of atoms depends on whether or not their outer-most shell is filled with electrons. If the outer shell is filled, the atom is stable. Atoms with unfilled outer shells are unstable, and will usually form chemical bonds with other atoms to achieve stability.

Explanation:

Answer:

The stability of atoms depends on whether or not their outer-most shell is filled with electrons. If the outer shell is filled, the atom is stable. Atoms with unfilled outer shells are unstable, and will usually form chemical bonds with other atoms to achieve stability.

Explanation:

The density of the substance having a mass of 2.0 g is 0.4 g/mL (Option D)

First, we shall obtain the volume of the substance. This can be obtained as follow:

Volume of substance = (Volume of water + substance) - (Volume of water)

Volume of substance = 75 - 70

Volume of substance = 5 mL

Finally, we shall determine the density of the substance. This is illustrated below:

Density = mass / volume

Density of substance = 2 / 5

Density of substance = 0.4 g/mL

Thus, the density is 0.4 g/mL (Option D)

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Answer:

Atoms can gain, lose, or share electrons during a chemical change. Chemical changes do not affect the nucleus of an atom. For this reason, an atom has the ability to retain its properties or identity even if the number of electrons is different. Therefore, the atom's identity won't change.

Explanation:

W = -P_ext ΔV

545 J = -P_ext × (-2.50 L)

545 J = 2.50 P_ext L

P_ext = -218 Pa

IG: whis.sama_ent

Answer:

Divide the mass of 60 g by the molecular weight. That gives you the number of moles of NO2. Multiply the number of moles of NO2 by Avogadro's number, which is 6.02 x 1023. That gives you the number of molecules of NO2.

Wavelength of the photon of light and then relaxes back to the ground state by emitting an infrared photon (1,200 nm) followed by an orange photon (600 nm) that was absorbed initially is 400nm

Wavelength of the photon that was absorbed initially can be calculated as follows:

Photon's energy is inversely related to its wavelength.

E ∝ 1/λA

Given that the energy of the absorbed photon () equals the total energy of the photons released (E₁ +E₂).

Eₐ=E₁ +E₂

the relationship between E and λ,

1 =   1 + 1

λₐ    λ₁   λ₂

1 =          1        +       1      

λₐ    600x 10⁻⁹    1200x 10⁻⁹

λₐ = 400nm

Therefore, the wavelength of the absorbed photon is 400 nm.

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The number of tablespoons of milk needed for 28 pancakes is determined as 12 tablespoons.

option C is the correct answer.

The number of the tablespoons of milk that would be needed is calculated by applying simple proportion method.

3 tablespoons of milk for 7 pancakes;

3 -----------> 7

? tablespoons of milk for 28 pancakes;

? --------------------> 28

Combine the two equations and solve for the number of tablespoons needed as follows;

? = ( 3 x 28 ) / 7

? = 12

Thus, The number of tablespoons of milk needed for 28 pancakes is determined by applying simple proportion.

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The following are the factors that influence the body's ability to absorb minerals:

The type of minerals the body contains.

supplements that are consumed without food.

Mineral excretion loss.

Nutritional factors and nutrient intake.

the person's state of health.

The bioavailability of oxide forms of trace minerals is typically the lowest, while the sulphate salts of these minerals have a bioavailability of 100%. Complete bioavailability of trace minerals is provided by sulphate salts, which improves flock performance.

The body needs zinc (Zn), copper (Cu), selenium (Se), chromium (Cr), cobalt (Co), iodine (I), manganese (Mn), and molybdenum as essential trace elements.

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Protons and neutrons are present inside the nucleus of an atom while electrons revolve around circular orbits.

What is Proton and Neutrons?

The atom is made up of the subatomic particles electron, proton, and neutron. The atom is made up of a core nucleus that has neutrons and protons in it. The nucleus is surrounded by electrons.

Neutrons are neutral, protons are positively charged, and electrons are negatively charged.

All atoms' nuclei include protons, which are subatomic particles with a positive charge. One proton has a positive charge. The quantity of protons in the element's nucleus determines its atomic number. Two up quarks and one down quark make up protons. The mass of it is 1.007277 amu (atomic mass units).

All atoms, with the exception of hydrogen, include neutrons, which are subatomic particles that are neutrally charged.

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Answer:

D. The energy in light waves comes in units called photons.

Explanation:

its known as quatum theory

The given reaction is already balanced, that is to say tha the number of atoms in the reactants matches the number of atoms in the products. In the reaction, we can see the relationship between CaC2 and H2O. For each mole of CaC2 two moles of H2O react.

So, if 4.8 moles of CaC2 are consumed the moles of H2O needed will be:

Mol of H2O = Mol of CaC2 x 2

Mol of H2O = 4.8 x 2 = 9.6 mol of H2O

Now, to calculate the grams of H2O we will use the following equation and the mass molar of H2O.

Mass molar of H2O =18.01 g/mol

So, if 4.8 moles of CaC2 are consumed in this reaction, 172.9 g of H2O are needed

Answer:

"A"

Explanation:

The magnetic dipole axis of the earth is tilted about 11½° from the rotation axis. This means the magnetic north pole and the geographic north pole are not in the same place. ...

They are also not the sam ehtings :

Magnetic axis is the straight line joining the two poles of a magnet (as the magnetic poles of the earth)

Rotational axis i think is the straight line that joines the north and the south pole of the  .earth .... NOTE: The earth is a bit tilted....

look at the daigram for reference.

The rotational axis of the Earth and its magnetic axis are separated by 11.5 degrees and are not one and the same.

The rotational axis is an imaginary line or axis through which any object rotates and revolves.

The angular momentum vector of the object is divided by the angular momentum magnitude to find the rotational axis of an object.

The rotational axis of the earth is 23.5 degrees.

Thus, the correct option is A.

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Answer:

Colors of transition metal compounds are due to two types of electronic transitions. Due to the presence of unpaired d electrons, transition metals can form paramagnetic compounds. Transition metals are conductors of electricity, possess high density and high melting and boiling points.

Explanation:

The  transition metals are  able to show different properties like varying color and paramagnetism due to presence of unpaired d-electrons.

The transition metals are defined as the elements  in which atoms are present whose d-sub-shell is partially filled .Due to which they give rise to cations with an incomplete d-sub-shell.

They are also defined as the elements which are present in the d-block of the periodic table, which includes groups from three to twelve.These elements are called transition elements as they show a transition between highly electro-positive group 1 and highly electro-negative group 17 elements.

They have characteristic properties due to which they can exist in variable oxidation states , form colored complexes and have catalytic properties as well.These elements are all technologically very important.

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4.33 grams of nitrogen are produced when 7.80 grams of dinitrogen tetrahydride reacts with hydrogen peroxide.

To determine the mass of nitrogen (N2) produced when 7.80 grams of dinitrogen tetrahydride (NaH) reacts with hydrogen peroxide (H2O2), we need to calculate the stoichiometry of the balanced chemical equation and use the molar masses of the compounds involved.

The balanced chemical equation is:

2NaH + 2H2O2 → N2 + 4H2O

From the equation, we can see that 2 moles of NaH react with 2 moles of H2O2 to produce 1 mole of N2. To find the molar mass of N2, we add the atomic masses of two nitrogen atoms:

Molar mass of N2 = 2 × Atomic mass of nitrogen = 2 × 14.01 g/mol = 28.02 g/mol

Now, let's calculate the number of moles of NaH:

Moles of NaH = Mass of NaH / Molar mass of NaH

Moles of NaH = 7.80 g / (22.99 g/mol + 1.01 g/mol) ≈ 0.3088 mol

According to the balanced equation, the molar ratio of NaH to N2 is 2:1. Therefore, the moles of N2 produced will be half the moles of NaH used:

Moles of N2 = 0.3088 mol / 2 ≈ 0.1544 mol

Finally, to find the mass of nitrogen produced, we multiply the moles of N2 by the molar mass of N2:

Mass of N2 = Moles of N2 × Molar mass of N2

Mass of N2 = 0.1544 mol × 28.02 g/mol ≈ 4.33 g

Therefore, approximately 4.33 grams of nitrogen are produced when 7.80 grams of dinitrogen tetrahydride reacts with hydrogen peroxide.

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Answer:

Few metals among them:

Explanation:

Some metals that are expensive and used to make ornaments are:

Rhodium:

Platinum

Gold

Silver

These are just a few of the many metals that are used to make ornaments. The specific metal that is used will depend on the desired look and durability of the ornament.

Sodium (Na) has a smaller radius than Cesium (Cs) due to the increase in number of electron shells in Cs compared to Na.

The atomic radius of an element is determined by the number of electron shells it has. As you move down a group in the periodic table, the number of electron shells increases, resulting in larger atomic radius. Sodium and Cesium belong to the same group in the periodic table, but Cesium has one additional electron shell than Sodium.

This increase in the number of electron shells leads to an increase in atomic radius, making Cesium have a larger atomic radius than Sodium. Therefore, Sodium has a smaller radius than Cesium.

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