Ellen needs to calculate which object has a mass of 27 grams. If each object has an identical volume of 3 cm3 , which object has a mass of 27 grams?

Answer:

Rods

Explanation:

Rods are photoreceptor cells in the eye that help us see in low light but play little to no role in color vision. Therefore, they would help Phineas to see shades of grey and large shapes in the dark,

Answer:

rods

Explanation:

The density of nitrogen gas at 15°C is 1.16 g/L. When nitrogen gas is collected over water, the total pressure is equal to the sum of the vapor pressure of water and the partial pressure of nitrogen gas. The vapor pressure of water at 15°C is 12.8 torr. Therefore, the partial pressure of nitrogen gas is 732.2 torr (745 torr - 12.8 torr).

The density of nitrogen gas is calculated using the ideal gas law equation as follows:PV = nRTwhere P is the pressure in atm, V is the volume in L, n is the number of moles, R is the gas constant (0.0821 L·atm/K·mol), and T is the temperature in Kelvin (K).The volume of the container is not given in the problem. Hence, we cannot directly calculate the density. However, we can rearrange the equation to solve for density instead of volume as follows:density (ρ) = (n × M) / Vwhere n is the number of moles, M is the molar mass, and V is the volume in L.

We can assume that the volume of water displaced is negligible. Therefore, the volume of the container is equal to the volume of nitrogen gas. We can also assume that the nitrogen gas behaves ideally. Hence, we can use the ideal gas law to calculate the number of moles as follows:PV = nRTn = (PV) / RTwhere P = 732.2 torr, V = volume of the container in L, R = 0.0821 L·atm/K·mol, and T = (15°C + 273.15) = 288.15 K. Molar mass of nitrogen gas is 28 g/mol.Using these values, we can calculate the density of nitrogen gas as follows:density = (n × M) / V = (PV / RT) × M / V= (732.2 torr × V / (0.0821 L·atm/K·mol × 288.15 K)) × (28 g/mol / 1000 g/L) / V= (732.2 torr × 28 g/mol) / (0.0821 L·atm/K·mol × 288.15 K × 1000) = 1.16 g/LTherefore, the density of nitrogen gas after filling this container is 1.16 g/L.

Nitrogen gas is collected over water at 15°C. The total pressure is 745 torr. The density of nitrogen gas after filling this container can be determined using the ideal gas law equation. The total pressure is equal to the sum of the vapor pressure of water and the partial pressure of nitrogen gas. The vapor pressure of water at 15°C is 12.8 torr.

Therefore, the partial pressure of nitrogen gas is 732.2 torr (745 torr - 12.8 torr).The volume of the container is not given in the problem. However, we can use the ideal gas law to calculate the number of moles of nitrogen gas. We can also assume that the volume of water displaced is negligible and that the nitrogen gas behaves ideally. The molar mass of nitrogen gas is 28 g/mol. Using these values, we can calculate the density of nitrogen gas as 1.16 g/L.Therefore, the density of nitrogen gas after filling this container is 1.16 g/L.

The density of nitrogen gas after filling this container over water at 15°C is 1.16 g/L.

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The net ionic equation for the reaction between aqueous solutions of phosphoric acid (H₃PO₄) and potassium hydroxide (KOH) is:

2H⁺(aq) + 2OH⁻(aq) → 2H₂O(l)

In this reaction, two hydrogen ions (H⁺) from the phosphoric acid combine with two hydroxide ions (OH⁻) from the potassium hydroxide to form two water molecules (H₂O).

When H₃PO₄ dissociates in water, it releases three H⁺ ions, while KOH dissociates to produce one OH⁻ ion. The balanced molecular equation is:

H₃PO₄(aq) + 3KOH(aq) → 3H₂O(l) + K₃PO₄(aq)

However, the net ionic equation focuses on the species directly involved in the reaction, excluding spectator ions that do not undergo any change. In this case, the spectator ions are the K⁺ and the phosphate ion (PO₄³⁻). Therefore, the net ionic equation only includes the hydrogen and hydroxide ions, resulting in the equation mentioned above.

The net ionic equation accurately represents the essential species and stoichiometry involved in the reaction between phosphoric acid and potassium hydroxide.

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The order with respect to A in the given reaction is 2. The order with respect to B in the given reaction is 2. The overall reaction order is 4.

The rate law of a chemical reaction expresses how the rate of the reaction depends on the concentrations of the reactants. In the given reaction, the rate law is stated as rate = k[A]^2 [B]^2, where k is the rate constant and [A] and [B] represent the concentrations of A and B, respectively.

The order with respect to A is determined by the exponent of [A] in the rate law, which is 2 in this case. This means that the rate of the reaction is directly proportional to the square of the concentration of A. Thus, doubling the concentration of A would result in a fourfold increase in the rate of the reaction, and halving the concentration of A would lead to a decrease in the rate by a factor of four. Similarly, the order with respect to B is determined by the exponent of [B] in the rate law, which is also 2 in this case. Therefore, the rate of the reaction is directly proportional to the square of the concentration of B.

The overall reaction order is the sum of the individual orders with respect to each reactant. In this case, the order with respect to A and B is 2, and when added together, the overall reaction order becomes 4. Understanding the order with respect to each reactant and the overall reaction order is crucial for understanding the rate behavior of the reaction and designing appropriate reaction conditions or mechanisms. In this particular reaction, the rate is highly dependent on the concentrations of both A and B, with their squares contributing significantly to the overall reaction rate.

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The concentration of the aqueous solution of Ca(OH)2 with a pH of 11.31 is approximately 0.00126 M.

To calculate the concentration of Ca(OH)2, we first determine the pOH of the solution by subtracting the pH from 14: pOH = 14 - 11.31 = 2.69. The pOH represents the negative logarithm (base 10) of the hydroxide ion concentration.

Using the pOH value, we can find the concentration of OH- ions: [OH-] = 10^(-pOH) = 10^(-2.69) ≈ 0.00126 M.

Since each formula unit of Ca(OH)2 dissociates into two OH- ions, the concentration of Ca(OH)2 is twice the concentration of OH- ions. Therefore, the concentration of the Ca(OH)2 solution is approximately 2 * 0.00126 M, which is 0.00252 M.

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When a bond is formed between a hydrogen atom and a sulfur atom, the electrons are shared to form a covalent bond.

In the process of bond formation between a hydrogen atom and a sulfur atom, the outermost electron shell of hydrogen (which has one electron) and the outermost electron shell of sulfur (which has six electrons) are involved. Both hydrogen and sulfur need to achieve a stable electron configuration, typically by filling their valence shell with a total of two electrons for hydrogen and eight electrons for sulfur.

To form a covalent bond, the hydrogen atom shares its electron with the sulfur atom. The electron pair is shared between the two atoms, allowing both atoms to achieve a more stable electron configuration. This sharing of electrons enables each atom to have a filled valence shell, satisfying the octet rule for both hydrogen and sulfur.

Therefore, in the case of a hydrogen-sulfur bond, the electrons are shared rather than transferred, indicating the formation of a covalent bond. The covalent bond allows the two atoms to share electrons in a mutually beneficial manner, resulting in a stable molecule.

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The subatomic particle that plays the greatest part in determining the properties of an element is the electron (B).

The properties of an element are primarily determined by its atomic structure. Elements are characterized by the number of protons, neutrons, and electrons they possess.

Protons and neutrons are located in the nucleus of an atom, while electrons orbit around the nucleus in energy levels or shells.

The electron configuration of an atom, specifically the arrangement and distribution of electrons in the outermost shell, is what primarily influences the chemical and physical properties of an element. The behavior of atoms in chemical reactions, bonding patterns, and electrical conductivity are all related to the movement and interactions of electrons.

Although protons and neutrons contribute to factors such as atomic mass and stability, the electron's involvement in chemical reactions and interactions is most significant in determining an element's properties.

Therefore, the subatomic particle that plays the greatest part in determining the properties of an element is the electron (B).

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Answer:

The last one, Positive charge occupies a very small volume in the atom.

Explanation:

Answer:

Cells are uncountable becasue they move around your body, make up your skin and other organs as well. And because when you grow, the cells multiply, and that makes it very hard for scientists to count cells in a human's body.

Explanation:

Hope this helped!

Arrhenius theory of acids and bases proposed by Svante Arrhenius in 1884 states that when an acid is added to water, hydrogen ions (H+) are produced. The correct answer is c. hydrogen ions.

According to Arrhenius theory of acids and bases, which was proposed by Swedish scientist Svante Arrhenius in 1884, an acid is a substance that dissociates in water to produce hydrogen ions (H+) while a base is a substance that dissociates in water to produce hydroxide ions (OH-). Therefore, when an acid is added to water, hydrogen ions (H+) are produced. Selecting the correct option from the given optionsAccording to Arrhenius,  The correct option from the given options is c. hydrogen ions. Hence, the correct answer is option c. hydrogen ions.

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Answer:

The wavelength of x-ray is 1 ×10⁻¹⁰ m.

Explanation:

Given data:

Frequency of xray = 3×10¹⁸ Hz

Wavelength of xray = ?

Solution:

Formula:

Speed of light = wavelength × frequency

c = λ × f

λ = c/f

This formula shows that both are inversely related to each other.

The speed of light is 3×10⁸ m/s

Frequency is taken in Hz.

It is the number of oscillations, wave of light make in one second.

Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.

Now we will put the values in formula.

λ = 3×10⁸ m/s  / 3×10¹⁸ Hz

Hz = s⁻¹

λ = 1 ×10⁻¹⁰ m

The wavelength of radiation is 1 ×10⁻¹⁰ m.

The concentration of B at equilibrium cannot be determined solely based on the information provided. Therefore, the answer is "e. none of these."

To determine the concentration of B at equilibrium, we need to know the equilibrium constant (K) for the given reaction. The equilibrium constant is a ratio of the concentrations of the products to the concentrations of the reactants, each raised to the power of their respective stoichiometric coefficients.

However, in this case, the equilibrium constant is not given. Without the value of K, we cannot calculate the concentration of B at equilibrium. The concentration of A alone does not provide enough information to determine the concentration of B.

Therefore, the correct answer is "e. none of these," as we cannot determine the concentration of B at equilibrium based on the given information.

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Sulfurous acid is a weak acid with the molecular formula H2SO3. It has two acidic hydrogen atoms, which can be sequentially neutralized. The successive neutralizations of each acidic hydrogen of sulfurous acid are as follows:

First acidic hydrogen: H2SO3 + NaOH → NaHSO3 + H2O

The molecular equation is H2SO3 + 2NaOH → Na2SO3 + 2H2O

The net ionic equation is H2SO3 + 2OH- → SO32- + 2H2O

Second acidic hydrogen: NaHSO3 + NaOH → Na2SO3 + H2O

The molecular equation is HHSO3 + NaOH → Na2SO3 + H2O

The net ionic equation is HSO3- + OH- → SO32- + H2O

Overall reaction: H2SO3 + 2NaOH → Na2SO3 + 2H2O

The molecular equation for the overall reaction is H2SO3 + 2NaOH → Na2SO3 + 2H2O

The net ionic equation for the overall reaction is H2SO3 + 2OH- → SO32- + 2H2O

In summary, the molecular and net ionic equations for the successive neutralizations of each acidic hydrogen of sulfurous acid are given above.

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Answer:

0.363 g

Explanation:

2As + 3Cl₂      →   2AsCl₃

calculate the number of moles of arsenic

Number of moles = mass/ molar mass

Number of moles =  0.150 g/ 75 g/mol

Number of moles = 0.002 mol

compare the moles of arsenic with arsenic chloride.

                         As             :             AsCl₃

                          2              :                2

                        0.002        :              0.002

Mass of arsenic chloride produced:

Mass = number of  moles × molar mass

Mass = 0.002 × 181.28 g/mol

Mass = 0.363 g

Mass of arsenic chloride produced is 0.363 g when 0.150 g of arsenic reacts with excess chlorine.

Arsenic trichloride is an inorganic compound with the formula AsCl₃, also known as arsenous chloride or butter of arsenic.

This poisonous oil is colourless, although impure samples may appear yellow. It is an intermediate in the manufacture of organoarsenic compounds

Given data:

Solution:

Chemical equation:

2As + 3Cl₂      →   2AsCl₃

Let's, calculate the number of moles of arsenic ;

Number of moles = mass/ molar mass

Number of moles =  0.150 g/ 75 g/mol

Number of moles = 0.002 mol

Now we will compare the moles of arsenic with arsenic chloride.

                         As             :             AsCl₃

                          2              :                2

                        0.002        :              0.002

Mass of arsenic chloride produced:

Mass = number of  moles × molar mass

Mass = 0.002 × 181.28 g/mol

Mass = 0.363 g

Therefore,Mass of arsenic chloride produced is 0.363 g when 0.150 g of arsenic reacts with excess chlorine..

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The balanced equation for the neutralization reaction between NaOH and H2SO4 can be given as follows: H2SO4 + 2NaOH → Na2SO4 + 2H2OThe stoichiometry of the reaction shows that 1 mole of H2SO4 reacts with 2 moles of NaOH.

We can calculate the moles of NaOH that reacted as follows:0.164 M NaOH = 0.164 moles/Liter

Therefore, the number of moles of NaOH present in 32.63 mL can be calculated as follows:

0.164 moles/L * 0.03263 L

= 0.00535 moles

Now we know that 0.00535 moles of NaOH were present in 25.00 mL of H2SO4. Since the stoichiometry shows that 1 mole of H2SO4 reacts with 2 moles of NaOH, we can calculate the number of moles of H2SO4 that were present in 25.00 mL of H2SO4 as follows:

0.00535 moles of NaOH * 1 mole of H2SO4/2 moles of NaOH

= 0.002675 moles of H2SO4

Now that we know the number of moles of H2SO4 present in 25.00 mL of solution, we can calculate the molarity of the solution as follows:

Molarity = Moles of solute/Volume of solution (in liters)

Molarity = 0.002675 moles/0.02500 Liters

= 0.107 M H2SO4

Therefore, the molarity of the H2SO4 solution is 0.107 M.

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They all are liquid (at room temperature), all are homogeneous mixture.

Answer:

B

Explanation:

G=gas while mass means the molecular weight

Answer:

Larger predators would cause the rabbit to run faster to outrun their predator, so speed is a variation. Also their environment where they might need to blend in with their surroundings so skin color.

The volume of the unit cell in a body-centered cubic crystal of element X can be calculated as 1.96 x 10^-22 cubic meters.

In a body-centered cubic (BCC) crystal structure, there is one atom at each of the eight corners of the unit cell and one atom at the center of the unit cell. The atom at the center of the unit cell is shared between eight adjacent unit cells.

The diagonal of the unit cell can be calculated using the radius of the atom. In a BCC structure, the diagonal (d) of the unit cell is equal to four times the radius (r) of the atom.

d = 4r = 4 * 125 pm = 500 pm

To convert picometers (pm) to meters (m), we divide by 10^12:

d = 500 pm / (10^12 pm/m) = 5 x 10^-10 m

The volume of the unit cell (V) can be calculated using the formula:

V = (d^3) / (4√3)

V = (5 x 10^-10 m)^3 / (4√3) = 1.96 x 10^-22 cubic meters

Therefore, the volume of the unit cell in a body-centered cubic crystal of element X is approximately 1.96 x 10^-22 cubic meters.

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Answer:F =MAX

Explanation:I did that

Answer:

F=MAX

Explanation:

I DID THAT TODAY AT 9:05AM FRIDAY 1/22/2021    

When 50 NBr3 molecules and 57 NaOH formula units react according to the given balanced equation, the result is the formation of 150 NaBr formula units.

According to the balanced equation provided:

2 NBr3 + 3 NaOH -> N2 + 3 NaBr + 3 HOBr

From the equation, we can see that 2 moles of NBr3 react with 3 moles of NaOH to form 3 moles of NaBr.

To determine the number of NaBr formula units formed, we need to convert the given quantities into moles.

Given:

Number of NBr3 molecules = 50

Number of NaOH formula units = 57

To convert the number of NBr3 molecules to moles, we need to divide the given quantity by Avogadro's number. Similarly, for NaOH formula units, we can directly consider them as moles.

Using Avogadro's number (6.022 x 10^23 molecules/mol), we can calculate the number of moles for NBr3 and NaOH:

Number of moles of NBr3 = 50 / (6.022 x 10^23)

Number of moles of NaOH = 57

Now, we can use the mole ratios from the balanced equation to determine the number of moles of NaBr formed. From the equation, we know that 2 moles of NBr3 react to form 3 moles of NaBr.

Number of moles of NaBr = (Number of moles of NBr3) x (3 moles of NaBr / 2 moles of NBr3)

Finally, we can convert the number of moles of NaBr to the number of NaBr formula units using Avogadro's number:

Number of NaBr formula units = (Number of moles of NaBr) x Avogadro's number

Calculating these values, we find that 50 NBr3 molecules and 57 NaOH formula units react to form 150 NaBr formula units.

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Answer:

A

Explanation:

They react violently with water

According to the electronic configuration and position in periodic table the alkali metals group has the most reactive elements.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Thus, the 0. 15 M solution of a weak acid is found to be 1. 3% ionized which is having Ka is 0.00195.

Given that the concentration of the weak acid is 0.15 M and it is found to be 1.3% ionized. We are to find the value of Ka of this weak acid. We know that for a weak acid HA, Ka is the equilibrium constant of its ionization reaction in water, which can be written as follows;

HA + H2O ⇌ H3O+ + A-

Where Ka = [H3O+][A-] / [HA]

Let the initial concentration of HA be C then the degree of ionization α is given by;α = ionized / CIn this case, the degree of ionization is 1.3% which can be expressed as 0.013 and the initial concentration of

HA is 0.15

M.α = 0.013,

C = 0.15M

So, the concentration of A- is Cα and the concentration of H3O+ is also Cα, because, in the equilibrium equation; [H3O+]:[A-] is 1:1.

On substituting these values in the Ka expression, we get;
Ka = [H3O+][A-] / [HA]

= Cα × Cα / (C - Cα)

But, C - Cα ≈ C in the case where α is very small in comparison to C.

So, Ka = Cα × Cα / Cα

= Cα= 0.15 M × 0.013

= 0.00195

Therefore, the value of Ka for this weak acid is 0.00195.

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Biphenyl has a higher boiling point than naphthalene due to stronger intermolecular forces between its molecules such as dispersion forces and π-π interactions, present in the biphenyl molecule.

The higher boiling point of biphenyl compared to naphthalene can be attributed to the structural differences between the two compounds and the resultant differences in intermolecular forces. Biphenyl consists of two phenyl (C6H5) rings connected by a single bond. Each phenyl ring has a delocalized π electron system, which creates regions of electron density above and below the plane of the molecule. These π electron systems allow for strong dispersion forces and π-π interactions between adjacent biphenyl molecules. The extended surface area of the molecule and the presence of these strong intermolecular forces contribute to a higher boiling point for biphenyl.

On the other hand, naphthalene is a fused aromatic hydrocarbon composed of two benzene rings. It also exhibits dispersion forces and π-π interactions, but the molecular shape of naphthalene is different from biphenyl. Naphthalene has a planar structure with a central carbon bridge, resulting in a smaller surface area compared to biphenyl. The reduced surface area and weaker intermolecular forces in naphthalene lead to a lower boiling point compared to biphenyl.

In summary, the higher boiling point of biphenyl compared to naphthalene can be attributed to the larger surface area and stronger intermolecular forces, such as dispersion forces and π-π interactions, present in the biphenyl molecule.

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Answer:

True

Explanation:

If you were to change up the order the answer may be incorrect

The scientific process is linear and most commonly follows the same sequence of steps in the same order. However, it need to follow all the steps for all scientific process. Hence, the statement is false.

A scientific process is a well designed approach to investigate or analyze the problem and to test a relevant hypothesis. The steps included in the scientific process starts from a scientific question.

The question then generates a hypothesis based on the observations and standard data. The testing is conducted with well designed experiment with all practical tools available.

The experimental results are thoroughly evaluated and the reaches with a conclusion. The results are communicated through various journals. This is the general way of a scientific process. But not every scientific strictly need to follow this. Hence, the statement is false.

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The volume of a 0.540 M NaOH solution that contains 12.5 g of NaOH is approximately 0.718 L.

To calculate the volume of the solution, we can use the formula:

Volume (L) = Mass (g) / Concentration (Molarity) * Molar Mass (g/mol)

First, we need to determine the molar mass of NaOH, which is 22.99 g/mol for sodium (Na), 16.00 g/mol for oxygen (O), and 1.01 g/mol for hydrogen (H). Adding these values together gives us a molar mass of 39.99 g/mol for NaOH.

Now, we can substitute the given values into the formula:

Volume (L) = 12.5 g / 0.540 M * 39.99 g/mol

Simplifying the calculation:

Volume (L) = 0.718 L

Therefore, the volume of the 0.540 M NaOH solution that contains 12.5 g of NaOH is approximately 0.718 L.

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Answer:

Copper

Explanation: