Which of the following is a main difference in cell structure between an onion cell and a human cheek cell? OA. There is no difference between an onion cell and a human cheek cell. OB. An onion cell has a cell wall. OC. An onion cell contains one nucleus, whereas a human cheek cell contains two nuclei. OD. A human cheek cell contains chloroplasts.​

Answer:

92.93 g

Explanation:

Number of half lives that have elapsed in eight days =8/14.3 = 0.559

Fraction of the radioactive nuclide that remains after 0.559 half lives is given by

N/No=(1/2)^0.559

Where N= mass of radioactive nuclides remaining after a time t

No= mass of radioactive nuclides originally present

N/No=(1/2)^0.559= 0.679

Mass of nuclides present eight days before= 63.1g/0.679

Mass of nuclides present eight days before=92.93 g

Taking into account the definition of a system of linear equations and molar mass, the molar masses of elements A and B are 26.778 \(\frac{g}{mole}\) and 17.998\(\frac{g}{mole}\) respectively.

A system of linear equations is a set of two or more equations of the first degree, in which two or more unknowns are related.

Solving a system of equations consists of finding the value of each unknown so that all the equations of the system are satisfied. That is to say, the values ​​of the unknowns must be sought, with which when replacing, they must give the solution proposed in both equations.

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

Being the molar masses of the compounds:

and considering the definition of molar mass of a compound, the system of equations to be solved is

\(\left \{ {{3mA + mB=98.33\frac{g}{mole} } \atop {mA + 2mB=62.77\frac{g}{mole} }} \right.\)

where mA and mB are the molar masses of elements A and B respectively.

There are several methods to solve a system of equations, it is decided to solve it using the substitution method, which consists of clearing one of the two variables in one of the equations of the system and substituting its value in the other equation.

Isolating the variable mB from the first equation:

mB= 98.33 \(\frac{g}{mole}\) - 3mA

and substituting in the second equation, you get:

mA + 2× (98.33 \(\frac{g}{mole}\) - 3mA)=62.77\(\frac{g}{mole}\)

Solving:

mA + 2× 98.33 \(\frac{g}{mole}\) - 2×3mA=62.77\(\frac{g}{mole}\)

mA + 196.66 \(\frac{g}{mole}\) - 6mA=62.77\(\frac{g}{mole}\)

mA - 6mA=62.77\(\frac{g}{mole}\) - 196.66 \(\frac{g}{mole}\)

(-5)mA= - 133.89 \(\frac{g}{mole}\)

mA= (- 133.89 \(\frac{g}{mole}\) )÷ (-5)

mA= 26.778 \(\frac{g}{mole}\)

Remember that mB= 98.33 \(\frac{g}{mole}\) - 3mA, replacing the value of mA:

mB= 98.33 \(\frac{g}{mole}\) - 3×(26.778 \(\frac{g}{mole}\))

mB= 80.334 \(\frac{g}{mole}\)

mB= 17.998 \(\frac{g}{mole}\)

Finally, the molar masses of elements A and B are 26.778 \(\frac{g}{mole}\) and 17.998\(\frac{g}{mole}\) respectively.

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Answer:

sub my channel pls

Explanation:

CoolBoiAmeen

STEP-BY-STEP EXPLANATION

Metals are ductile because of the ability of the atoms to roll over each other into new positions without breaking the metallic bond.

Metals are ductile also because the delocalized electrons are free to move. The metallic bond is formed by the electrostatic attraction between the positively charged ions of the atom of the metal and the negatively delocalized electron.

Answer:

Extinction

Explanation:

When a species becomes extinct, every last specimen has died out

Step 1: Write the balanced "molecular equation:

\(2HI(aq) + CrCO₃ (s) → CrI₂ (s) + H₂O(l) + CO₂(g)\)

Step 2: Carbon dioxide and water are written in molecular form. Consult the solubility and net ionic equation rules on the information page to determine which of the other substances will dissociate:

\(2HI(aq) + CrCo₃ (s) → Crl₂ (s) +H₂O(l)+CO₂(g)\)

yes no yes

Step 3: Dissociate all soluble salts, strong acids, and strong bases (except calcium hydroxide), Leave together all "not soluble" salts and weak acids or bases:

\( {2H₂O}^{ + } (aq) + {2I}^{ - } (aq) + CrCO₃ (s)→ {Cr}^{2 + } (aq) + {2I}^{ - }(aq) + 3H₂O(l) + CO₂(g)\)

Step 4: Cross out "spectator lons that appear on both sides of the reaction (these lons do not participate in the chemistry) and rewrite the "net" reaction using the smallest possible coefficients:

\( {2H₂O}^{ + } (aq) + CrCO₃ (s) →3H₂O + CO₂ + {Cr}^{2 + } \)

Answer:

H3PO4 (phosphoric acid) is weak acid

Explanation:

This is because weak acid is an acid that ionizes only slightly in an aqueous solution.

Answer:

Explanation:

a) For a first-order reaction, the rate of the reaction is proportional to the concentration of the reactant, i.e., rate = k[A]. The integrated rate law for a first-order reaction is given by:

ln([A]t/[A]0) = -kt

where [A]t is the concentration of the reactant at time t, [A]0 is the initial concentration, k is the rate constant, and t is time.

If a reaction is 50% complete in 30.0 min, it means that [A]t/[A]0 = 0.5. Substituting these values into the equation above, we can solve for the rate constant:

ln(0.5) = -k(30.0 min)

k = 0.0231 min^-1

Now, if the reaction is 75% complete, it means that [A]t/[A]0 = 0.25 (since 50% is half of the initial concentration and 75% is a quarter of the initial concentration). Substituting this value and the rate constant into the equation above, we can solve for the time t:

ln(0.25) = -0.0231 min^-1 * t

t = 61.3 min

Therefore, for a first-order reaction, the reaction will be 75% complete after 61.3 min.

b) For a zero-order reaction, the rate of the reaction is independent of the concentration of the reactant, i.e., rate = k. The integrated rate law for a zero-order reaction is given by:

[A]t = -kt + [A]0

where [A]t is the concentration of the reactant at time t, [A]0 is the initial concentration, k is the rate constant, and t is time.

If a reaction is 50% complete in 30.0 min, it means that [A]t = 0.5[A]0. Substituting these values into the equation above, we can solve for the rate constant:

0.5[A]0 = -k(30.0 min) + [A]0

k = 0.0167 M/min

Now, if the reaction is 75% complete, it means that [A]t = 0.25[A]0. Substituting this value and the rate constant into the equation above, we can solve for the time t:

0.25[A]0 = -0.0167 M/min * t + [A]0

t = 45.0 min

Therefore, for a zero-order reaction, the reaction will be 75% complete after 45.0 min.

Answer:

connections, patterns

Explanation:

the investigation is to find, discover or sometimes create an idea of something

The waves that  has the greatest wavelength is Wavelength shown with 1 wavelength stretched over a long distance.

A wave could be a disturbance or variety that voyages through a medium or space, carrying vitality without transporting matter. Waves can take different shapes and happen totally different sorts of waves, counting mechanical waves and electromagnetic waves.

Mechanical waves require a medium to propagate, meaning they require a substance like water, discuss, or a strong fabric to transmit the wave. Illustrations of mechanical waves incorporate water waves, sound waves, and seismic waves. In these waves, particles of the medium sway or vibrate in a design, exchanging energy from one molecule to another.

Electromagnetic waves, on the other hand, don't require a medium and can travel through vacuum, such as in space. Electromagnetic waves comprise of electric and attractive areas swaying opposite to each other and to the heading of wave engendering. Illustrations of electromagnetic waves incorporate obvious light, radio waves, microwaves, infrared waves, bright waves, X-rays, and gamma beams.

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The ball's potential energy is transferring into kinetic energy

Brainly if correct? Thanks!

Answer:

A

Explanation:

The balls potential energy is changing to kinetic energy

Answer:

Preventing erosion – Land Reclamation

Protecting nesting areas – Protecting Biodiversity

Preventing littering – Land Reclamation

Preventing habitat disruption – Protecting Biodiversity

Protecting native species – Protecting Biodiversity

Preventing contamination of soil – Land Reclamation

Explanation:

I really hope I'm right! I tried my hardest, please give me brainliest :)

have a good day!

When two objects have the same mass and applied force to them then their acceleration will be the same. Therefore, option (B) is correct.

The acceleration of an object is described as the rate of change of velocity with respect to time. The acceleration is a vector parameter as it contains magnitude and direction. Acceleration is equal to the second derivative of position w.r.t. time and is equal to the first derivative of velocity of an object w.r.t. time.

According to Newton's second law of motion, acceleration is inversely proportional to the mass of the body.

F = ma

or, a = F/m

The acceleration depends upon two factors applied force and the mass of the object. If both factors are the same for an object then the acceleration will be the same.

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Based on the provided steps, we are conducting an experiment involving copper(II) sulfate solution and zinc powder. We are measuring the temperature change that occurs when zinc reacts with copper(II) sulfate.

Measurement:

Initial temperature (°C): This is the temperature of the copper(II) sulfate solution before adding zinc powder. Use a thermometer to measure and record this temperature.

Final temperature (°C): This is the highest temperature reached by the solution after adding the zinc powder and allowing the reaction to occur. Watch the thermometer for a couple of minutes and record the highest temperature observed.

Temperature change (°C): Calculate the difference between the initial and final temperatures. Subtract the initial temperature from the final temperature and record the result as the temperature change.

Follow the steps provided to carry out the experiment and record the corresponding measurements in the table. Make sure to use the pipette to transfer 10 milliliters of copper(II) sulfate solution to test tube 3, then add 0.25 grams of zinc powder to the test tube.

Monitor the temperature using a thermometer and record the initial and final temperatures accurately. Finally, calculate the temperature change by subtracting the initial temperature from the final temperature and record the value in the table.

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The application of force in the direction of the motion of an object. The second scenario involves applying force to a moving item that is traveling in the opposite direction.

A force is an influence that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. A force has both a direction and a magnitude.

Force is used to describe a body's tendency to modify or change its state as a result of an external cause. When force is applied, the body can also alter its size, shape, and direction.

A push or pull that an object experiences as a result of interacting with another item is known as a force. Every time two items interact, a force is exerted on each of the objects. The force is no longer felt by the two objects when the interaction ends.

Thus, Force applied to an item in motion that originates in any direction constitutes the third situation where force is created.

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12.0 grams of \(Pb(NO_3)_2\) would produce 10.1 grams of \(PbCl_2\) precipitate .

To determine the number of moles of lead(II) chloride (\(PbCl_2\)) precipitate that could be produced from reacting 12.0 grams of lead(II) nitrate (\(Pb(NO_3)_2\)), we need to first write and balance the chemical equation for the reaction between these two compounds:

\(Pb(NO_3)_2 (aq) + 2NaCl (aq) = PbCl_2 (s) + 2NaNO_3 (aq)\)

From the balanced equation, we can see that one mole of \(Pb(NO_3)_2\) reacts with 2 moles of NaCl to produce one mole of \(PbCl_2\).

The molar mass of \(Pb(NO_3)_2\) is:

207.2 g/mol (Pb) + 2(14.0 g/mol) + 6(16.0 g/mol) = 331.2 g/mol

To determine the number of moles of \(Pb(NO_3)_2\) present in 12.0 grams of the compound, we can use the following formula:

moles = mass/molar mass

moles of \(Pb(NO_3)_2\) = 12.0 g / 331.2 g/mol = 0.0362 mol

From the balanced equation, we know that 1 mole of \(Pb(NO_3)_2\) reacts to produce 1 mole of \(PbCl_2\). Therefore, 0.0362 moles of \(Pb(NO_3)_2\) will produce 0.0362 moles of \(PbCl_2\)

The molar mass of \(PbCl_2\) is:

207.2 g/mol (Pb) + 2(35.5 g/mol) = 278.7 g/mol

Therefore, the mass of \(PbCl_2\) that could be produced is:

mass = moles x molar mass = 0.0362 mol x 278.7 g/mol = 10.1 g

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Answer:

\(\boxed{\text{Q1. 3.6 g; Q2. 0.2 A}}\)

Explanation:

Q1. Mass of Cu

(a) Write the equation for the half-reaction.

Cu²⁺ + 2e⁻ ⟶ Cu

The number of electrons transferred (z) is 2 mol per mole of Cu.

(b) Calculate the number of coulombs

q  = It  

\(\text{t} = \text{1.0 h} \times \dfrac{\text{3600 s}}{\text{1 h}} = \text{3600 s}\\\\q = \text{3 C/s} \times \text{ 3600 s} = \textbf{10 800 C}\)

(c) Mass of Cu

We can summarize Faraday's laws of electrolysis as

\(\begin{array}{rcl}m &=& \dfrac{qM}{zF}\\\\& = &\dfrac{10 800 \times 63.55}{2 \times 96 485}\\\\& = & \textbf{3.6 g}\\\end{array}\\\text{The mass of Cu produced is $\boxed{\textbf{3.6 g}}$}\)

Note: The answer can have only two significant figures because that is all you gave for the time.

Q2. Current used

(a) Write the equation for the half-reaction.

Ag⁺ + e⁻ ⟶ Ag

The number of electrons transferred (z) is 1 mol per mole of Ag.  

(a) Calculate q

\(\begin{array}{rcl}m &=& \dfrac{qM}{zF}\\\\2.00& = &\dfrac{q \times 107.87}{1 \times 96 485}\\\\q &=& \dfrac{2.00 \times 96485}{107.87}\\\\& = & \textbf{1789 C}\\\end{array}\)

(b) Calculate the current

t = 3 h = 3 × 3600 s = 10 800 s

\(\begin{array}{rcl}q&=& It\\1789 & = & I \times 10800\\I & = & \dfrac{1789}{10800}\\\\& = & \textbf{0.2 A}\\\end{array}\\\text{The current used was $\large \boxed{\textbf{0.2 A}}$}\)

Note: The answer can have only one significant figure because that is all you gave for the time.

Answer:

calculate

ture

chemical equation:

2S03(g) 2502(g) + O2(g)

(a)

temperature and give its units.

In the vapour phase, sulphur trioxide dissociates according to the follow

Write , expression for this dissociation reaction.

producing a pressure of 10 atm. Calculate the value of Kp

At a particular temperature, 75% of sulphur trioxide is dissociate

The acceleration of the car is -2.3m/s².

Acceleration is the rate at which the direction and speed of motion change over time. It is said to have been accelerated when something changes its direction and moves faster or slower. Motion on a circle accelerates even when the speed is constant because the direction is constantly changing.

Velocity is the rate at which displacement changes. The rate at which speed changes is known as acceleration. Because it consists of both magnitude and direction, velocity is a vector quantity. Since acceleration is merely the rate at which velocity changes, it too is a vector quantity.

v = u +at

0 = 35 + a×15

15a = -35

a = -35/15

a = -2.3m/s².

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Answer:

B. -2.3 m/s²

Explanation:

To answer this question, we have to use the following formula:
\(\boxed{a = \frac{v - u}{t}}\),

where:

• a ⇒ acceleration

• v ⇒ final velocity

• u ⇒ initial velocity

• t ⇒ time taken for the change in velocity to occur

From the question, we know that initially, the car was travelling at 35 km/h. Therefore, u = 35 km/h. The question also tells us that the car comes to a full stop, meaning its final velocity is 0 m/s. Therefore, v = 0 km/h. It takes the car 15 seconds to stop, so t = 15 s.

Using the information above and substituting it into the formula, we can calculate the acceleration of the car:

\(a = \frac{0 - 35}{15}\)

  = -2.3 m/s²

Therefore, the acceleration of the car is -2.3 m/s², and the correct answer is B.

Answer: MM = 16.55 g/mol

Explanation: Freezing point depression is a phenomena that explains why adding a solute to a solvent decreases the solvent freezing point: when a substance begins to freeze, its molecules slows down and rearrange itself forming a solid. If a solute is added, the molecules from the solvent interfere in the formation of the solid. To guarantee the transformation, the solution has to cooled down even more.

Freezing point and molality concentration is related by

\(\Delta T=T_{f}_{(solvent)}-T_{f}_{(solution)}=K_{f}.m\)

where

ΔT is freezing point depression

\(T_{f}_{(solvent)}\) and \(T_{f}_{(solution)}\) are freezing point of solvent and solution, respectively

\(K_{f}\) is freezing point depression constant

m is molality concentration

Dibenzyl ether is the solvent and has the following properties: \(K_{f}=\) 6.27 and \(T_{f}\) = 3.6°C.

Molality concentration is

\(m=\frac{T_{(solvent)}-T_{(solution)}}{K_{f}}\)

\(m=\frac{3.6-1}{6.27}\)

m = 0.415

Molality concentration is moles (n) of solute dissolved in a mass, in kilogram, of solvent.

\(m=\frac{moles}{mass(kg)}\)

n = m(mass of solvent in kg)

n = 0.415(0.035)

n = 0.0145

Molar mass (M) is the weight of one sample mole and can be calculated as

\(n=\frac{m}{M}\)

M = \(\frac{m}{n}\)

m in grams

Molar mass of compound X is

\(M=\frac{0.24}{0.0145}\)

M = 16.55

Molar mass of molecular compound X is 16.55g/mol

Answer

Pressure is decreased

Explanation

As the pressure on a gas increases, the volume of the gas decreases because the gas particles are forced closer together. Conversely, as the pressure on a gas decreases, the gas volume increases because the gas particles can now move farther apart.

Answer:

2000 millimeters

Explanation:

Answer:

All of these properties are due to the chemical structure of the compound. The chemical structure includes the bonding angle, the type of bonds, the size of the molecule, and the interactions between molecules. Slight changes in the chemical structure can drastically affect the properties of the compound.Some atoms become more stable by gaining or losing an entire electron (or several electrons). When they do so, atoms form ions, or charged particles. Electron gain or loss can give an atom a filled outermost electron shell and make it energetically more stable.

Explanation:

The chemical structure of the compound is responsible for all of these properties. The chemical structure includes the bonding angle, bond type, molecule size, and intermolecular interactions. Slight changes in the chemical structure can have a significant impact on the compound's properties.

A chemical compound is a substance made up of many identical molecules that contain atoms from more than one chemical element and are held together by chemical bonds. A molecule made up of only one element's atoms is thus not a compound.

An atom's valence shell electrons determine how it interacts with neighboring atoms, and thus its chemical properties. Because sodium and lithium both have one valence electron, their chemical properties are similar.

The number of electrons in an atom's outermost shell determines its reactivity, or proclivity to form chemical bonds with other atoms. This outermost shell is referred to as the valence shell, and the electrons found within it are referred to as valence electrons.

Thus, The chemical structure of the compound is responsible for all of these properties.

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Answer:

See answer below

Explanation:

This is pretty easy to solve. First you need to understand that an ionic compound is usually formed between a metal and a non metal. This usually happens between elements from group 1 through group 10 or 11 of the periodic table. A covalent compound is always given in non metal elements from the periodic table, and it's usually the elements from group 13 through group 17.

Some compounds there are missing some atoms, but I manage to find this question and saw the atoms missing, so, in my answer you will see the corrected compound. so don't be surprised.

According to what I state above, then the covalent compounds are:

C₆H₅N

PCl₃

C₂H₄O

NH₃

N₂

SO₄²⁻

The ionic compounds are:

CaO

CdBr₂

WO₂

Na₂O

CsF

Hope this helps

Explanation:

The ball is falling down,

At height of 2.1m, there is both potential and kinetic energy with the ball.

the mechanical energy is 172.1J which will be equal to the sum of kinetic and potential energy.

172.1= Ep + Ek

172.1= mgh + 0.5×m×v^2

172.1 =( 7.26 × 9.81 × 2.1 ) + (0.5 × 7.26 × v^2)

172.1 = 149.6 + 3.63v^2

3.63v^2= 22.5

v^2 = 6.198

v= \( \sqrt{6.198} \)

v= 2.49

or u can write it 2.5m/s^2

Answer:

To find the volume of the rock, subtract the initial volume of the water from the final volume of the water: 50 mL - 30 mL = 20 mL. Therefore, the volume of the rock would be equal to 20 mL or 20 cc.

Explanation:

Answer:

Pb(ClO₄)₂ (aq) + 2 NaCl (aq) -----> 2 NaClO₄ (aq) + PbCl₂ (s)

Explanation:

This chemical reaction is a double-displacement reaction. In these reactions, the cation of one compound is swapped with the cation of another.

So, lead (II) (Pb²⁺) from lead (II) perchlorate (Pb(ClO₄)₂) will be swapped with sodium (Na⁺) from sodium chloride (NaCl). When creating the new compounds, there may need to be more than one ion of a particular type in order to make the overall compound neutral.

An equation is balanced when there is an equal amount of each element on both sides of the reaction. If these amounts are unequal, you can add coefficients to modify the quantities of particular compounds.

The unbalanced reaction:

Pb(ClO₄)₂ (aq) + NaCl (aq) -----> NaClO₄ (aq) + PbCl₂ (s)

Reactants: 1 lead, 3 chlorine, 8 oxygen, 1 sodium

Products: 1 lead, 2 chlorine, 4 oxygen, 1 sodium

The balanced reaction:

Pb(ClO₄)₂ (aq) + 2 NaCl (aq) -----> 2 NaClO₄ (aq) + PbCl₂ (s)

Reactants: 1 lead, 4 chlorine, 8 oxygen, 2 sodium

Products:  1 lead, 4 chlorine, 8 oxygen, 2 sodium

Answer:C) travel through solids and liquids

Explanation:

Though S waves can travel through solids, they cannot travel through liquids.

HOPE THIS HELPS!!!

Sound wave travel through solids and liquids. Therefore, the correct option is option C among all the given options.

A wave is anything that moves energy through a medium from one location to another. Transverse waves, longitudinal waves, as well as surface waves are the three primary forms of waves.

Transverse waves transport a medium back and forth with a right angle to the energy motion to transmit energy. In order to carry energy ahead, longitudinal waves compress and expand the medium. On the contrary hand, surface waves move the material in a clockwise direction to transmit energy. Sound wave travel through solids and liquids.

Therefore, the correct option is option C.

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