What would be the concentration of a solution made by adding 250 mL of water to 45.0
mL of 4.2 M KOH?

The mass of the object of density 5g/cm³ and volume 10 cm³ is 50kg.

Defining density How tightly a material is packed together is determined by its density. Its definition is "mass per unit volume". D or, the symbol for density

Density Formula: = m/V,

where is the density, m is the object's mass, and V is its volume.

The units used change depending on the calculation's use of mass and volume units. Density would be expressed in kg/cm³ if the mass is expressed in kg and the volume in cm³.

Density = mass / volume

Mass = density ×  volume

Mass =  5×10

Mass = 50 kg.

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Answer:

a. neutral

b. basic /alkaline

c. acidic

4. 13

Transition Metals is more often used to conduct electricity. Transition metals have free electrons in outer energy levels because d-orbitals shields poorly. That's why transition metals are good conductor of heat and electricity.

Transition metals are similar to main group metals in many ways, including their metallic appearance, malleability and ductility, ability to conduct heat and electricity, and ability to form positive ions.

In the periodic table, transition metals are found between s-block and p-block elements. D-block elements is the name given to them. A family of metals that display instability and transitional behavior between s block and p block elements are referred to as "transition metals."

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The outcome of the two steps would be the formation of solid barium chloride and aqueous zinc hydroxide. a) The formation of 50.0 mL of 1.0 M barium chloride solution in the beaker. b) The formation of solid barium nitrate and aqueous zinc chloride.

When 50.0 mL of 1.0 M barium hydroxide solution is mixed with 50.0 mL of 1.0 M hydrochloric acid solution, a neutralization reaction occurs according to the following balanced chemical equation:

Ba(OH)2(aq) + 2HCl(aq) → BaCl2(aq) + 2H2O(l)

The result is the formation of 50.0 mL of 1.0 M barium chloride solution in the beaker.

When 120.0 mL of 1.0 M zinc nitrate solution is added to the beaker containing the barium chloride solution, a double displacement reaction occurs according to the following balanced chemical equation:

BaCl2(aq) + Zn(NO3)2(aq) → Ba(NO3)2(aq) + ZnCl2(aq)

The result is the formation of solid barium nitrate and aqueous zinc chloride.

However, it is important to note that the solubility of barium nitrate is much lower than that of barium chloride, so some of the barium nitrate may precipitate out of the solution as a solid.

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Answer:  **

H-N-H

   |

  H

Explanation:

Look at a periodic table to determine how many electrons you need to account for. Hydrogen (H) only has 1 electron, while Nitrogen (N) has 5. We have three Hydrogen atoms and one Nitrogen atom, so the total number of electrons will be 3 * 1 + 5 = 8 e-.

Now, place the center atom, which will be Nitrogen and place the three Hydrogens on three sides of it as above in the answer. You should use single bonds for this. Each single bond is a pair of electrons, so since we have three single bonds so far, we have accounted for 2 * 3 = 6 electrons. However, we need 2 more electrons for the total of 8. We put these electrons in as a lone pair above Nitrogen.

We check to see if everything follows the octet rule: Nitrogen has three single bonds, so that's 6 e-, as well as one lone pair, so that's another 2 e- for a total of 8 e-. Check. Now look at Hydrogen: H is the only element whose full orbital is 2 e-. Each H has a single bond with Nitrogen, so each does have 2 e-.

Thus, we know this is the correct diagram, and we are done.

Explanation:

A bond line structure of a compound has H N H in linear plane and a hydrogen is branching upward, and the compound is H N (H) H. The nitrogen has two dots at its bottom represents a lone pair of electrons. So ,the correct answer is option C.

The correct Lewis structure for ammonia (\(NH_3\)) is option C. It shows a bond line structure with three hydrogen atoms (H) bonded to a central nitrogen atom (N) in a linear plane.

One hydrogen atom branches upward from the plane. Additionally, the nitrogen atom in this structure has two dots at its bottom, indicating a lone pair of electrons. This arrangement follows the octet rule, as nitrogen has formed three covalent bonds with hydrogen, completing its valence shell. The lone pair on nitrogen gives ammonia its characteristic properties.

Thus, option C accurately represents the Lewis structure of ammonia, showing the bonding and lone pair arrangement of its atoms.

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Answer:

1.345.0

Explanation:

Hope this helpssss

Answer:

ethyl ethanoate

Explanation:

it helps you

Answer:

Temperature and pressure

Explanation:

As you go down within the earth from the crust to the core, the temperature and pressure levels increases significantly.

The deeper one goes within the earth, the hotter and more pressurized it becomes.

Daria had some beach sand with her. The sand has a 72 gramme mass. She calculated the volume using the graduated cylinder below. The graduated cylinder contains 15 mL of sand.

The volume of the sand is calculated using the graduated cylinder below. The sand's bulk is specified as 72 grammes.

We can use the water displacement method to calculate the volume of the sand. Following is a description of how to estimate the amount of sand using the water displacement method:

The graduated cylinder of water should first be measured for volume.

The graduated cylinder's water volume should then be measured after adding the sand to it. The volume of water increases by the same amount.

Let's use the provided problem to implement this approach.

In the beginning, there is 10 mL of water in the graduated cylinder. The graduated cylinder contains 25 mL of water once the sand has been added.

The amount of sand is therefore equal to the difference between the two volumes, which is: Sand volume equals final water volume minus initial water volume (25 - 10 = 15 mL).

As a result, there are 15 mL of sand in the graduated cylinder.

Answer : 15

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Answer:

What is the question?

Explanation:

The correct answer is 76.9 g of \(Cl_{2}\) is required to react with 19.5 g of \(Al\). Therefore, the correct option is: 76.9 g.

What is Atomic Mass?

Atomic mass, also known as atomic weight or relative atomic mass, is a measure of the mass of an atom of a chemical element. It is expressed in atomic mass units (amu) or unified atomic mass units (u). Atomic mass is a weighted average mass of the naturally occurring isotopes of an element, taking into account their relative abundances.

The balanced chemical equation for the reaction is:

\(2Al\) (s) + 3\(Cl_{2}\) (g) → \(Al_{2}\)\(Cl_{6}\)

From the equation, we can see that the molar ratio between \(Al\)and Cl2 is 2:3. This means that 2 moles of \(Al\) react with 3 moles of \(Cl_{2}\)

To find out how many grams of \(Cl_{2}\) are required to react with 19.5 g of \(Al\) we need to convert the given mass of \(Al\) to moles using its molar mass, and then use the mole ratio from the balanced equation to calculate the amount of \(Cl_{2}\).

The molar mass of \(Al\) is 27 g/mol, and the molar mass of \(Cl_{2}\) is 2 * 35.45 g/mol = 70.9 g/mol.

Moles of \(Al\)= Mass of \(Al\)/ Molar mass of\(Al\)

Moles of \(Al\) = 19.5 g / 27 g/mol ≈ 0.722 mol

According to the mole ratio from the balanced equation, 2 moles of \(Al\)react with 3 moles of \(Cl_{2} .\)

Moles of \(Cl_{2}\)= Moles of \(Al\) * (3 moles of \(Cl_{2}\) / 2 moles of \(Al\))

Moles of \(Cl_{2}\) = 0.722 mol * (3/2) ≈ 1.083 mol

Now, we can convert moles of \(Cl_{2}\) to grams using its molar mass.

Mass of\(Cl_{2}\) = Moles of \(Cl_{2}\) * Molar mass of \(Cl_{2}\)

Mass of\(Cl_{2}\) = 1.083 mol * 70.9 g/mol ≈ 76.9 g

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Answer:

1.b

2.d

3.e

4.a

5.c

6.f

7.g

hope it help

please mark as brainliest

The solute-solvent interactions present in this solution are dipole-dipole interactions and dispersion forces.

The solute in this case is N(CH3)3, and the solvent is CH3CN.

N(CH3)3 is a polar molecule with a nitrogen atom in the center bonded to three methyl (CH3) groups. CH3CN is also a polar molecule.

The types of intermolecular forces that can be present in this solution are:

Therefore, the solute-solvent interactions present in this solution are dipole-dipole interactions and dispersion forces.

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Regenerate response

Answer:

Metastable state

Explanation:

The stability of atoms depends on whether or not their outermost 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.

Answer:

Wavelength (typically measured in nanometers) is the distance between two points in a wave.Frequency (typically measured in Hertz) is the number of waves in a specific time . Frequency and wavelength have both direct and inverse relationships. The crucial difference between frequency and wavelength is that frequency shows the total number of wave oscillations in a given time. As against wavelength specifies the distance between two specific points of a wave.

Explanation:

Frequency is how often something changes per second be it amplitude of a voltage on a wire or be it the bobbing back and forth of a bobblehead. Frequency is how often something moves up and down in a second. If a bobble head moves forward and backward in one second then it has a bobbling frequency of 1 Hertz (Hz). The unit of frequency is Hertz (Hz) or # of cycles or oscillations per second. A wavelength is measured in distance like meters (m). For photons or light or radiowaves the equation is wavelength=speed of light/frequency.

Answer:

Wavelength (typically measured in nanometers) is the distance between two points in a wave, while frequency is how often something changes per second be it amplitude of a voltage on a wire or be it the bobbing back and forth of a bobblehead.

Answer: Nuclear fusion- The simple answer is that deep inside the core of the Sun, enough protons can collide into each other with enough speed that they stick together to form a helium nucleus and generate a tremendous amount of energy at the same time.

Answer:

A mole ratio is ​the ratio between the amounts in moles of any two compounds involved in a chemical reaction.

Mole ratios are used as conversion factors between products and reactants in many chemistry problems.

Explanation:

Answer:

B: All of the choices!

Explanation:

Choice 1: Simply, there is no current without voltage, so it DOES cause current.

Choice 3: Voltage DOES push free electrons around a circuit. Without it, free electrons will move around between atoms, but randomly, so they wouldn't be much use.

Choice 4: Voltage IS measured in volts, so this option is true as well.

Choice 2: Voltage is all of those answers, so it is true! :D

Hope i helped! :]

Answer:

Its B! :D

Explanation: I got it correct!

A Mole should not be considered a base unit in the SI system.

SI system is a metric system which is also known as the International system of units. Most of the measurements across the globe is measured by SI system. SI units are used in nearly every part of the globe, such as science, technology, mathematics and many more. The system includes coherent units known as derived units.

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The valency of elements tends to decrease as we move down the periodic table of non-metal and metal.

The ability of an element to combine is referred to as valency. It is the number of electrons that an elemental atom loses, gains, or shares with another atom to form a stable configuration of electrons.

The occasional table is organized so that components with comparable valencies are set in a similar gathering. Components in a similar gathering have similar number of valence electrons, which decides their substance properties.

The valency of the elements tends to decrease as we move down a periodic table of metals and non-metals. This is because the number of electron shells, or energy levels, increases as we move down a group. The peripheral electrons in a particle are the valence electrons.

The expanded distance between the core and the peripheral electrons brings about more vulnerable fascination between them. As a result, the atom becomes more reactive and can lose or gain electrons more easily.

For instance, in bunch 1 of the occasional table, the valency of the components diminishes as we drop down the gathering. The valencies of lithium (Li), sodium (Na), and potassium (K) are, respectively, 1, 1, and 1.

This is due to the fact that each possesses one valence electron. Because the outermost electron is further from the nucleus and therefore more likely to be lost or gained, the valency decreases as we move down the group.

In conclusion, as we move down the periodic table, from non-metal to metal, the valency of elements tends to decrease. This is because the nucleus and the outermost electrons are less attracted to one another as the energy levels rise.

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Answer:

The cell potential for the given galvanic cell is 0.188 V.

Explanation:

To calculate the cell potential, we can use the Nernst equation:

Ecell = E°cell - (RT/nF)ln(Q)

where E°cell is the standard cell potential, R is the gas constant (8.314 J/mol·K), T is the temperature in Kelvin (25°C = 298 K), n is the number of moles of electrons transferred (in this case, n = 2), F is the Faraday constant (96,485 C/mol), and Q is the reaction quotient.

First, we need to write the half-reactions and their standard reduction potentials:

Sn4+(aq) + 2e- → Sn2+(aq) E°red = 0.15 V

Fe3+(aq) + e- → Fe2+(aq) E°red = 0.77 V

The overall reaction is the sum of the half-reactions:

Sn2+(aq) + 2Fe3+(aq) → Sn4+(aq) + 2Fe2+(aq)

The reaction quotient Q can be expressed as:

Q = [Sn4+][Fe2+]^2 / [Sn2+][Fe3+]^2

Substituting the given concentrations, we get:

Q = (0.00655)(0.01139)^2 / (0.0624)(0.0437)^2 = 0.209

Now we can calculate the cell potential:

Ecell = 0.15 V + 0.0592 V log([Fe2+]^2/[Fe3+]) + 0.0592 V log([Sn4+]/[Sn2+])

= 0.15 V + 0.0592 V log(0.01139^2/0.0437^2) + 0.0592 V log(0.00655/0.0624)

= 0.188 V

Therefore, the cell potential for the given galvanic cell is 0.188 V.

The cell potential for the given galvanic cell in which the given reaction occurs at 25 °C is 0.188 V.

To find the cell potential, we take the Nernst equation:

Ecell = E°cell - (RT/nF)ln(Q)

In which R is the gas constant (8.314 J/mol·K) and E° cell is the standard cell potential.

T temperature in Kelvin (25°C = 298 K), and n is the number of moles of electrons transferred (n = 2), Q is the reaction quotient and F is the Faraday constant (96,485 C/mol).

Firstly, write the half-reactions and then their standard reduction potentials:

Sn⁴⁺(aq) + 2e⁻  → Sn²⁺(aq) E°red = 0.15 V

Fe³⁺(aq) + e⁻ → Fe²⁺(aq) E°red = 0.77 V

The overall reaction is the sum of the half-reactions:

Sn²⁺(aq) + 2Fe³⁺(aq) → Sn⁴⁺(aq) + 2Fe²⁺(aq)

The Q reaction quotient can be written as:

Q = [Sn⁴⁺][Fe²⁺]² ÷ [Sn²⁺][Fe²⁺]²

Substituting the given concentrations, we observe:

Q = (0.00655)(0.01139)² ÷ (0.0624)(0.0437)² = 0.209

Next, we can find the cell potential:

Ecell = 0.15 V + 0.0592 V log([Fe²⁺]²/[Fe³⁺]) + 0.0592 V log([Sn⁴⁺]/[Sn²⁺])

= 0.15 V + 0.0592 V log(0.01139²÷0.0437²) + 0.0592 V log(0.00655÷0.0624)

= 0.188 V

Thus, the cell potential for the given galvanic cell is 0.188 V.

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Answer:

H2SO4(acid), NaOH(base)

Explanation:

Answer:

1 - NO2 at 339 K

2 - Ne at 371 K

3 - H2 at 371 K

4 - H2 at 425 K

Explanation:

Kinetic Energy is directly related to temperature; the higher the temperature the higher the kinetic energy. Kinetic energy is also equal to 12m⋅v2, so if we want a high velocity we want high temp and low mass. So let's list out approximate masses:

m(H2)≈2

m(NO2)≈46

m(Ne)≈20

So we have NO2 at 339 K, the lowest temperature out of the mix, and the highest mass out of the mix, so this is moving the slowest.

In contrast, we have H2 at 425 K, the highest temperature out of the mix, and the lowest mass out of the mix, so this is moving the fastest.

Now we have Ne and H2 at 371 K, since they are at the same temperature they have the same kinetic energy. But H2 is lighter than Ne so it must be faster. To quantify this mathematically, let's assume (this is wrong but just as an assumption for an example) KE at 371 K is 100:

100=12⋅m⋅v2

200=m⋅v2

√200m=v

So H2 is about v=10 and Ne is about v=√10≈3

So the order to recap is:

1 - NO2 at 339 K

2 - Ne at 371 K

3 - H2 at 371 K

4 - H2 at 425 K

Hope that makes it clearer!

A stationary front is a boundary between two different air masses that aren't moving relative to each other, but instead are stationary.An air mass is a massive body of air with uniform temperature and moisture characteristics. An air mass takes on the qualities of the area where it forms. As an air mass moves from one place to another, it carries its temperature and moisture content with it.

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Answer:

100 g/mol

Explanation:

The equation of the reaction;

Ca^2+(aq) + EDTA(aq) -----> (CaEDTA)^2-(aq)

Let CA = concentration of EDTA

VA = volume of EDTA

NA= number of moles of EDTA

CB= concentration of marble

VB = volume of marble

NB= number of moles of marble

CAVA/CBVB = NA/NB

CAVANB=CBVBNA

CB = CAVANB/VBNA

CB = 0.01052 *  23.56  * 1/10.00  * 1

CB = 0.02479 M

number of moles = concentration * volume

number of moles = 0.02479 M * 100.00/1000L

number of moles = 2.479 * 10^-3 moles

number of moles = mass/molar mass

molar mass =  0.2481g/2.479 * 10^-3 moles

molar mass =  100 g/mol

Answer:

Reaction rate

Explanation:

We are told that Ben observes how quickly some dry wood is burning in a campfire.

This is an example of reaction rate because it tells us the speed i.e. how fast the dry wood is reacting with the camp fire.