F-actin is a polymer of G-actin monomers and exhibits symmetry. (T/F)

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question we have

\(volume = \frac{78}{7.8} \\ \)

We have the final answer as

Hope this helps you

Answer:

hope this helped

Calcium Hydroxide + Sulfuric Acid = Calcium Sulfate + Water

Explanation:

As a gaseous element condenses, the atoms become closer together and they have more attraction for one another.

The transformation of water vapour into liquid is known as condensation. The process is the opposite of evaporation, in which liquid water turns into a vapour. Either the air is chilled to its dew point or it gets too saturated with water vapour to retain any more water, causing condensation to occur.

Attraction - Gas Particles move continuously in a straight path in a gas. They are significantly further apart and move independently of one another because the kinetic energy of the molecule is larger than the attraction force between them. There are often almost no attractive forces between particles.

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Answer: Unknown

Explanation:

In order to solve the question you would require the approximate amount of gravity upon the diver, meaning his acceleration due to gravity.

There are various types of hazards that can be found in a chemistry laboratory. Here are two of them: Chemical Hazards and Physical Hazards.

1. Chemical Hazards: Chemical hazards are substances that have the potential to cause physical or health harm when exposed to humans or the environment. These may include substances that are poisonous, flammable, or explosive. They may be gases, liquids, or solids. Chemical hazards can be toxic or reactive. Toxic chemicals are poisonous and can cause damage to organs, irritation of skin and eyes, and respiratory issues. Reactive chemicals may combust or react dangerously with other substances if they are not handled properly.

2. Physical Hazards: Physical hazards are objects or conditions that have the potential to cause physical harm to individuals in the laboratory. These may include objects such as glassware, sharp objects, and electrical equipment. Glassware can break and cause cuts and lacerations, while sharp objects can puncture or cut skin. Electrical equipment can cause electric shocks or fires if not handled correctly. Physical hazards can also include environmental hazards such as loud noises or extreme temperatures, which can cause hearing loss or thermal burns.

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To ensure safety while carrying out her experiment, Maria should follow proper laboratory protocols and take necessary precautions like handle equipment and glassware carefully,wear appropriate personal protective equipment (PPE),read safety data sheets (SDS) to understand the proper handling,never work alone in the laboratory,etc.

Here are some recommendations:

1.Wear appropriate personal protective equipment (PPE), including safety goggles, lab coat, and gloves, to protect her eyes, body, and hands from potential hazards.

2.Familiarize herself with the properties and potential risks associated with the chemicals she will be working with. Read safety data sheets (SDS) to understand the proper handling, storage, and disposal procedures.

3.Work in a well-ventilated area or use a fume hood to minimize exposure to any fumes or gases that may be generated during the experiment.

4.Handle equipment and glassware carefully to prevent accidents or breakages. Ensure that all equipment is in good condition and appropriate for the experiment.

5.Follow proper techniques for measuring, mixing, and transferring chemicals to prevent spills or splashes. Use appropriate containers and labels to clearly identify and store chemicals.

6.Be aware of emergency procedures, including the location of safety equipment such as fire extinguishers, eyewash stations, and emergency showers.

7.Never work alone in the laboratory. Inform a supervisor or lab mate about the experiment and maintain communication throughout the process.

By following these safety measures, Maria can minimize risks and ensure a safe working environment during her experiment.

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87.9 milligrams of helium are produced by an initially pure 12.0 g 239pu after  20,000 years

The law of exponential decay is given by:

       N=N0 *e^ −λt  

where

   N0 is initial moles of plutonium

   λ is disintegration constant

   t=given time

         λ= ln2/T

  T is half life of  239pu

The number of atoms that have decayed equals the number of undecayed  atoms N subtracted from the initial atoms, that is:

         N0-N=  N0-N0*\(e^{-\frac{ln2 * t}{T} }\)

                   = N0(1-\(e^{-\frac{ln2 * t}{T} }\)  )

         N0=M*(\(N_{A}\))/M

         N0-N=1.3226  * \(10^{22}\)

\(m_{HE}\)=  \(\frac{(N0-N)*m_{HE}}{N_{A}}\)  

         = (1.3226  * \(10^{22}\)) *(4)  / (6.023 * \(10^{23}\)  )

        =0.0879 g

        = 87.9 mg

So ,87.9 milligrams of helium are produced.

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Answer: 2.5 grams

Explanation:

Expression for rate law for first order kinetics is given by:

\(t=\frac{2.303}{k}\log\frac{a}{a-x}\)

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process  

a) to calculate the rate constant:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

\(t_{\frac{1}{2}}=\frac{0.693}{k}\)

\(k=\frac{0.693}{2years}=0.346years^{-1}\)

b) to find amount left after 4 years

\(4=\frac{2.303}{0.346}\log\frac{10}{a-x}\)

\((a-x)=2.5g\)

Thus 2.5 g of cesium would remain from a 10 g sample after 4 years

What should you have ready before introducing a sample or solvent to a separatory funnel. A flask under the separatory funnel, a stopcock closed, and a funnel at the top of the separatory funnel.

A tube used to pour liquids and powders in containers with small holes, having sides that slant inward and a broad opening just at top as well as a narrow aperture at the bottom: Through a funnel, pour the batter into the heated oil. funnel.

The steps that led to that conversion are tracked by a funnel. For instance, e-commerce businesses desire customers to make product purchases on their website. These are possible steps in their funnel: visited website, looked at merchandise, added item to basket, and made purchase.

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Menthol, like methanol, occurs naturally and has several isomers. One structural characteristic of menthol that is responsible for it having enantiomers is that it has a chiral center.

Chiral centers are atoms with four different substituents attached to them, and they are a type of stereocenter. Menthol has a chiral center, which means it has two possible enantiomers.

Enantiomers are molecules that are mirror images of each other and cannot be superimposed on one another.

The two enantiomers of menthol are (1R,2S,5R)-(−)-menthol and (1S,2R,5S)-(+)-menthol. They have identical physical and chemical properties, except for their interaction with polarized light. This is due to the fact that they rotate plane-polarized light in opposite directions.

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Given that a simple cubic structure consists of a single atom in the center of the cube and the lattice constant is a0, we need to find the volume density of atoms and the surface density of atoms in the (110) plane. Volume density of atoms. Volume density is the number of atoms per unit volume of the crystal.

The number of atoms per unit cell is 1 and the volume of the unit cell = a0³∴ Volume density of atoms = Number of atoms per unit volume= 1/a0³Surface density of atoms. The (110) plane passes through the center of each face, and each corner atom contributes 1/8 of an atom to each of the 8 unit cells which share it. Thus each corner atom contributes (1/8)(8) = 1 atom to the plane. There are 2 atoms per unit cell in the (110) plane. Hence, surface density of atoms in (110) plane = Number of atoms in (110) plane / area of the plane= 2 atoms/unit cell / [√2(a0)]²= 2/2a0²= 1/a0². Thus, Volume density of atoms = 1/a0³Surface density of atoms in (110) plane = 1/a0²

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Answer: The pOH value is 2.

Explanation:

Given: \([H^{+}] = 9.9 \times 10^{-13} M\)

pH is defined as the negative logarithm of hydrogen ion concentration.

Hence, pH of the given solution is calculated as follows.

\(pH = -log [H^{+}]\\= - log (9.9 \times 10^{-13})\\= 12\)

The relation between pH and pOH is as follows.

pH + pOH = 14

Therefore, pOH is calculated as follows.

pH + pOH = 14

12 + pOH = 14

pOH = 14 - 12

= 2

Thus, we can conclude that the pOH value is 2.

Answer:

To solve this problem, we need to apply the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction. This means that the total mass of the reactants must be equal to the total mass of the products.

We start by writing a balanced chemical equation for the reaction between baking soda and vinegar:

NaHCO3 + CH3COOH → NaCH3COO + H2O + CO2

This equation tells us that one mole of baking soda (sodium bicarbonate) reacts with one mole of vinegar (acetic acid) to produce one mole of sodium acetate, one mole of water, and one mole of carbon dioxide.

We can use the molar masses of the compounds involved to convert the given masses into moles:

84 g of baking soda is equivalent to 0.8 moles (84 g / 84 g/mol)

60 g of vinegar is equivalent to 1.0 moles (60 g / 60 g/mol)

18 g of water is equivalent to 1.0 moles (18 g / 18 g/mol)

82 g of sodium acetate is equivalent to 1.0 moles (82 g / 82 g/mol)

Answer:

From the given compounds MgO has the highest lattice energy.

The process of breaking down a larger molecule into its monomers is called hydrolysis. Hydrolysis is an essential chemical reaction that allows larger molecules such as polymers to be broken down into smaller, more manageable molecules called monomers.

Hydrolysis is a type of chemical reaction that uses water to break apart the bonds that hold larger molecules together, resulting in the production of monomers. Hydrolysis is the opposite of dehydration synthesis, which is the process by which monomers are joined together to form polymers.

Hydrolysis is a vital process that occurs in living organisms, allowing them to break down complex molecules such as proteins, carbohydrates, and fats into smaller molecules that can be used as energy sources or building blocks for other molecules.

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The term spontaneous in a chemical reaction refers to a process that occurs naturally and without any external influence, driven by a decrease in Gibbs free energy.


In chemistry, a spontaneous reaction is one that can proceed on its own without the need for an external force or energy input. This natural tendency for a reaction to occur is determined by the change in Gibbs free energy (ΔG). If ΔG is negative, the reaction is spontaneous and favors the formation of products.

If ΔG is positive, the reaction is non-spontaneous and favors the reactants. The Gibbs free energy depends on factors such as the change in enthalpy (ΔH) and entropy (ΔS), as well as the temperature of the system. A spontaneous reaction does not necessarily imply that it occurs rapidly; it may still have a slow reaction rate depending on factors like activation energy and catalyst presence.

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The end-to-end separation of the coiled PVC molecule is approximately 91.4 Angstroms.

To compute the end-to-end separation of a coiled PVC molecule, we need to consider its molecular weight, tetrahedral bond angle, and carbon-carbon bond length.

The given values are:

- Number-average molecular weight: 130,737 g/mol

- Tetrahedral bond angle: 109.5°

- Carbon-carbon bond length: 1.54 Å

First, we need to determine the number of carbon-carbon bonds in the PVC molecule. The molecular weight of a single PVC monomer (C₂H₃Cl) is approximately 62.5 g/mol.

Therefore, the number of monomer units in the coiled

PVC molecule can be calculated as follows:

Number of monomer units = 130,737 g/mol ÷ 62.5 g/mol ≈ 2091 units

Since there is one carbon-carbon bond in each PVC monomer unit, we have approximately 2091 carbon-carbon bonds. Now, we can apply the concept of random walk to find the end-to-end separation.

For a random walk in three dimensions, the end-to-end separation can be determined using the following equation:

R = (b² * N)⁰·⁵

Where R is the end-to-end separation, b is the carbon-carbon bond length (1.54 Å), and N is the number of monomer units (2091). R = (1.54² * 2091)⁰·⁵≈ 91.4 Å

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To calculate the internal energy of a monatomic gas, we can use the equation:

Internal Energy (U) = (3/2) * n * R * T

where:

n is the number of moles of the gas

R is the ideal gas constant (R = 8.314 J/(mol·K))

T is the temperature in Kelvin

First, we need to convert the temperature from Celsius to Kelvin:

0 °C + 273.15 = 273.15 K

Now we can plug in the values into the equation:

U = (3/2) * 2.45 mol * 8.314 J/(mol·K) * 273.15 K

Calculating the expression:

U ≈ 10,084.68 J

Therefore, the internal energy of 2.45 moles of a monatomic gas at a temperature of 0 °C is approximately 10,084.68 Joules.

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1. Johann Balmer's equation can be used to determine the wavelength of the absorption/emission lines of the hydrogen atom. 2. Electrical current from a 9-volt battery is not a type of electromagnetic radiation.

1. Johann Balmer's equation can be used to determine the wavelength of the absorption/emission lines of the hydrogen atom. The formula can be expressed as R [1/2² - 1/n²], where R is the Rydberg constant, 1/n² is the energy level of the electron dropping to level n², and 1/2² is the level the electron drops to. The equation's mathematical form is like the equation of wavelengths of visible light (lambda = k /n²), where k is a constant and n is the energy level.

2. Electrical current from a 9-volt battery is not a type of electromagnetic radiation. Electromagnetic radiation is a type of energy that is transported in waves, such as radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. Electrical current from a 9-volt battery, on the other hand, is an electrical current, not a wave of energy.

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Answer:

chlorie (Cl)

Explanation:

aluminum is a metal.

potassium is a metal.

calcium is a metal.

But chlorine is a nonmetal.

brainlest??

Answer:

He has two protons

Li electron has one electron in its outermost orbital.

Number of neutrons of nitrogen = seven neutrons

The second shell of boron: 3 electrons.

Explanation:

An atom is composed of electrons, protons and neutrons. The number of neutrons is determined by subtraction of the atomic number from the mass number.

The electronic configuration is already known for each of atoms in these questions according to standard tables.

Answer:

1.) Make a He atom with a mass of 4. How many protons did you put in the nucleus?

2

2.) Make a Li atom with a mass number of 7. How many electrons did you place in the outermost orbital (ring)?

1

3.) Make a N atom with a mass number of 14. How many neutrons are in the nucleus?

7

4.) Make a B atom with a mass number of 11. How many electrons did you put in the second orbital (ring)?

3

Explanation:

Did it on Edgenuity and got it correct (2020).

The mass of a proton is expressed in scientific notation as 1.67 x 10⁻²⁴ grams.

This notation makes it simpler to express very small or very large numbers since it represents a value that is stated as a number multiplied by a power of 10.

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Smooth endoplasmic reticulum are the structure responsible for the synthesis of fatty acids and steroids, detoxification and inactivation of drugs and potentially harmful substances.

Vertebrate liver cells include smooth endoplasmic reticulum, which aids in the detoxification of medicines and toxins. It has enzymes that can convert medications and metabolic waste products from lipid-soluble to water-soluble forms, allowing for simple removal from the body.

Due to the presence of an organelle known as SER, liver cells in the human body detoxify medications and other toxins. Steroid production also involves SER.

Important tasks carried out by peroxisomes include lipid metabolism and toxic detoxification. Additionally, they participate in oxidation processes that degrade fatty acids and amino acids.

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To determine the maximum amount of Cr2O3 that can be produced and identify the limiting reagent, we need to compare the amounts of Cr(NO3)3 and Na2O and determine which reactant will be completely consumed.

Given:

Mass of Cr(NO3)3 = 1.75 grams

Mass of Na2O = 1.75 grams

First, we need to convert the masses of Cr(NO3)3 and Na2O to moles using their molar masses.

Molar mass of Cr(NO3)3:

(1 x atomic mass of chromium) + (3 x atomic mass of nitrogen) + (9 x atomic mass of oxygen)

= 1(52.00 g/mol) + 3(14.01 g/mol) + 9(16.00 g/mol)

= 152.00 g/mol

Moles of Cr(NO3)3 = Mass / Molar mass = 1.75 g / 152.00 g/mol

Molar mass of Na2O:

(2 x atomic mass of sodium) + (1 x atomic mass of oxygen)

= 2(22.99 g/mol) + 1(16.00 g/mol)

= 61.98 g/mol

Moles of Na2O = Mass / Molar mass = 1.75 g / 61.98 g/mol

Next, we can determine the stoichiometric ratio between Cr(NO3)3 and Cr2O3 using the balanced chemical equation:

2 Cr(NO3)3 + 3 Na2O -> Cr2O3 + 6 NaNO3

From the balanced equation, we can see that the mole ratio between Cr(NO3)3 and Cr2O3 is 2:1.

Now, we compare the moles of Cr(NO3)3 and Na2O to determine the limiting reagent.

Moles of Cr2O3 that can be produced from Cr(NO3)3 = (Moles of Cr(NO3)3) / 2

Moles of Cr2O3 that can be produced from Na2O = (Moles of Na2O) / 3

The limiting reagent is the one that produces the least amount of Cr2O3.

If the moles of Cr(NO3)3 / 2 < Moles of Na2O / 3, then Cr(NO3)3 is the limiting reagent.

If the moles of Cr(NO3)3 / 2 > Moles of Na2O / 3, then Na2O is the limiting reagent.

Now, we can calculate the moles of Cr2O3 produced using the limiting reagent.

Moles of Cr2O3 = (Moles of limiting reagent) * 1

Finally, we can convert the moles of Cr2O3 to grams using its molar mass.

Mass of Cr2O3 = Moles of Cr2O3 * Molar mass of Cr2O3

By comparing the amounts of Cr(NO3)3 and Na2O and calculating the moles and masses of Cr2O3, we can determine the limiting reagent and the maximum amount of Cr2O3 that can be produced.

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Answer:

c

Explanation:

The commercial technology commonly uses plasma is a television. The correct option is c.

Commercial technology is any technology that is employed in the business world, including electric power, radio, television, phones, and other similar devices. These items are employed commercially in a variety of fields. An electrical gadget called television is used to watch entertainment.

Plasma is a substance found in televisions; these gas-filled pockets receive electricity to transform into plasma screens. The UV rays that these plasmas then emit create a picture as they pass through the phosphorus cells.

Thus, the correct option is c. a television, regarding a commercial technology that commonly uses plasmas.

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Group one of the periodic table are known as alkali metals. These elements include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

Group one of the periodic table is known as the alkali metals. These elements include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

                                They are highly reactive metals and share common properties such as being soft, having a shiny appearance, and reacting vigorously with water to produce hydrogen gas and alkaline solutions.

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Answer:

4.0 kg

Explanation:

M = W/g = 39.2/9.8 = 4.0 kg

sorry if its wrong-

Answer:

-400.3 kJ/mol

Explanation:

Answer:

569K

Explanation:

Q = 3.5kJ = 3500J

mass = 28.2g

∅1 = 20°C = 20 + 273 = 293K

∅2 = x

c = 0.449

Q = mc∆∅

3500 = 28.2×0.449×∆∅

3500 = 12.6618×∆∅

∆∅ = 3500/12.6618

∆∅ = 276.4220

∅2 - ∅1 = 276.4220

∅2 = 276.4220 + ∅1

∅2 = 276.4220 + 293

∅2 = 569.4220K

∅2 = 569K

When the temperature is increased, there is the increase in thermal energy of the system. The final temperature of the iron in kelvins is 570 K.

The energy is the ability to do work.

Given is the energy Q = 3.5 kJ = 3500 J, mass of sample m = 28.2 g, specific heat of iron Cp = 0.449 J(g•K).

The initial temperature in kelvins is T1 = 20°C = 20 + 273 = 293K

The heat is related to the temperature difference as

Q = m c ∆T

Substitute the values into the expression,

3500 = 28.2 × 0.449 × ∆T

3500 = 12.6618 × (T2 -T1)

T2 - T1 = 276.4220

T2 = 276.4220 K +293 K

T2 = 569.4220K

The temperature of the iron is approximately 570 K.

Thus, the final temperature of the iron in kelvins is 570K.

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Answer:

5.12x10¹¹ millimeters

Explanation:

Milli is a prefix used in science and engineering to decribe the number as the exponent x10⁻³. In the prefix kilo, the number is at the exponent x10³.

5.12x10⁵ kilometers are:

5.12x10⁵ kilometers * (1000m / 1km) = 5.12x10⁸ meters

5.12x10² meters * (1m / 1000millimeters) = 5.12x10¹¹ millimeters