30) The presence of ________ dramatically increases the speed at which an action potential moves along an axon.A) a capsuleB) plasma proteinC) neurilemmaD) glial cellsE) myelin

Answer:

Lattice energy is an estimate of the bond strength in ionic compounds. It is defined as the heat of formation for ions of opposite charge in the gas phase to combine into an ionic solid.

Explanation:

Reflecting telescopes are preferred for scientific research because they are better suited for gathering large amounts of light and producing high-quality images. However, refracting telescopes are still popular for amateur astronomers and for viewing objects on Earth.

Reflecting telescopes are different from refracting telescopes because reflecting telescopes use mirrors, whereas refracting telescopes use lenses. The reflecting telescope was invented in 1668 by Sir Isaac Newton, and it has since become one of the most popular types of telescopes.
Reflecting telescopes use a mirror to gather and focus light, while refracting telescopes use a lens to do the same thing. Reflecting telescopes can be made much larger than refracting telescopes because it is easier to make large mirrors than it is to make large lenses. The mirror in a reflecting telescope is placed at the back of the telescope, and it gathers and reflects light back to a secondary mirror, which then reflects the light to the eyepiece. The eyepiece is where the observer looks through the telescope.In contrast, the lens in a refracting telescope is placed at the front of the telescope, and it gathers and bends light as it passes through. The lens focuses the light onto an eyepiece at the back of the telescope. Refracting telescopes are generally smaller than reflecting telescopes because of the difficulty of making large lenses.
Another difference between reflecting and refracting telescopes is the way they are constructed. Reflecting telescopes have a simple tube that houses the mirrors and eyepiece, while refracting telescopes have a more complex design with a long tube that contains the lens and eyepiece.

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Answer:

               2.22 mole

Explanation:

At STP one mole of an ideal gas occupies 22.4 L of volume.

Hence,

Volume = mol × 22.4 L/mol

solving for mole,

Mole = Volume / 22.4 L/mol

Putting values,

Mole = 49.8 L / 22.4 L/mol

Mole = 2.22 mole

20,000 is the correct answer

What is empirical formula ?

The empirical formula of a chemical compound is the simplest ratio of the number of atoms of each element present in a compound. It represents the smallest whole number ratio of the elements in a compound and gives an indication of the relative proportions of the elements. The empirical formula is not necessarily the same as the molecular formula, which represents the actual number of atoms in a molecule. The molecular formula may be a multiple of the empirical formula and can be determined by analyzing the compound's molecular weight.

Multiply each by 20,000, then we have

C: 2.48925 x 20,000 = 49,785

H: 3.9901 x 20,000 = 79,802

O: 1.000 x 20,000 = 20,000

Multiply each element by in order to have them all reach the smallest whole number will be 20,000.

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Answer: The answer is 2

Explanation:

Answer:

It allows the traveler to justify questionable expense items.

hope that helped <3

Answer:

soil retains water and nutrients

Explanation:

abiotic factors

water

soil

pH

Answer: B

Explanation:

Answer:

okie!

Explanation:

Answer:

ok i. d k u but thnaks for points ill follow u anyways lol

Explanation:

The speed of the particles rises with the temperature of the solid, liquid, or gas. The particles slow down with decreasing temperature.

A liquid can turn into a solid if it is cooled down far enough.

The average kinetic energy of the molecules falls as a liquid cools.

The liquid eventually turns into a solid when the quantity of heat removed is sufficient to cause the molecules to be attracted to one another.

Freezing is the process of transitioning from a liquid to a solid.

It loses thermal energy when the liquid cools. Its constituent particles therefore decelerate down and converge.

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Global winds would be affected if all areas of Earth received the same amount of solar radiation is the distribution of solar heating across the planet produce global wind pattern

The earth climate system depend entirely on the sun for its energy and solar radiation warm the atmosphere and fundamental to atmospheric composition and while the distribution of solar heating across the planet produces global wind pattern and contributes to the formation of clouds and storm and rainfall and scientist say that one percent decreases would lower earth means global temprature by more than degree kelvin and according to the model decrease in solar energy of loss than 10 percent could effectively freeze earth entire surfaces

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Answer:

2, 4, and 5

Explanation:

have a nice day:)

Answer:

2, 4, and 5

Explanation:

Hope this Helps!!!

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Answer:

Baseball: PE

Satellite: KE

Sky Diver: KE

Basketball: PE

Arrow: KE

Cliff Diver: PE

Swinging Girl: PE

Grasshopper: PE

Bobsled: KE

Slingshot: PE

Explanation:

  For a thrown object, KE and PE are in a sort of equilibrium. As the object climbs towards its highest point, it slows down as the initial KE that initiated the movement runs out. At the highest point, it is out of kinetic energy and full of potential energy. Gravity then pulls on the object and causes it to accelerate, thus giving it more KE. The PE at the top of the arc is because at that point, the object has the potential to fall to earth. This is the reasoning behind the baseball, swinging girl, and grasshopper.

  This is, in a way, the same reasoning behind the other potential energy cases as well. The basketball, cliff diver, and slingshot are all about to start moving. The first two will be pulled by gravity and the last one will be propelled be the stretchy slingshot material attempting to snap back into place.

  All of the KE examples are due to the object or person actively moving towards or around something. This means that they have kinetic energy--the energy of movement!

Answer:

Baseball: Potential Energy

Satellite: Kinetic Energy

Sky Diver: Kinetic Energy

Basketball: Potential Energy

Arrow: Kinetic Energy

Cliff Diver: Potential Energy

Swinging Girl: Potential Energy

Grasshopper: Potential Energy

Bobsled: Kinetic Energy

Slingshot: Potential Energy

Explanation:

Water and carbon dioxide are the byproducts of hydrocarbon burning.

A mixture of hydrocarbon is called a hydrocarbon. The hydrocarbons methane (CH4), ethane (C2H6), and ethyne are examples of (C2H2). These compounds are all hydrocarbons since their corresponding molecular formulas show that they are all solely composed of the elements hydrogen and carbon.

The biggest and most intricate carbon molecules are found in coal. Various hydrocarbons produce different amounts of water and carbon dioxide because their hydrogen to carbon ratios vary. The ratio of charcoal to hydrogen is typically higher in longer, more complicated molecules.

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Answer:

i dont know but ill try anyways

Explanation:

........

Answer:

4.9 × 10²³ molecules

Explanation:

Given data:

Number of molecules = ?

Number of moles of oxygen = 0.815 mol

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

0.815 mol  ×  6.022 × 10²³ molecules  / 1 mol

4.9 × 10²³ molecules

A mixture of glucose water can be separated by the method of evaporation. Water being a volatile substance will evaporate and glucose will be left behind.

At 220 °C, aqueous glucose solutions start to break down, and at 251 °C, particles start to form. Particles easily form at a slow heating temperature of 280 °C. A 65% solid residue made up of nanoparticles can be produced when aqueous glucose solutions react at 350 °C with gradual heating, as seen by SEM.

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The student can claim: We can’t know for sure whether or not the mass changed, but it seems reasonable to claim that the mass did not change, given that the ranges of uncertainty overlap.

Since the student used the same electronic balance with an uncertainty of 0.05g to measure the mass of the solution before and after chemical reaction, the conclusion is that the masses are the same within the uncertainty of the balance.

+- value is uncertainty value of measurement.

Accuracy is the closeness of a measurement to the true value.

Balance is an instrument for comparing the mass of two bodies.

The percent error is an error between an observed value and the true value of a measurement.

Percent Error = (Actual Value - Estimated Value / Actual Value) × 100%

There are three types of error in chemistry: gross errors, random errors and systematic errors.

Missing options:

The mass definitely stayed the same because the measurement of 50.25 g was obtained each time.

The mass definitely stayed the same because the ranges of uncertainty overlap exactly.

We can’t know for sure whether or not the mass changed, but it seems reasonable to claim that the mass did not change, given that the ranges of uncertainty overlap.

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Explanation:

Bromine is a halogen in group VII A of the periodic table with atomic number 35,an atomic weight of 79.91, and a density of 3.12 Mg.In the solid state it forms a cubic crystal with a melting point of -72 C and boiling point of 58 C.

Bromine's liquid state at 25°C indicates melting point below 25°C and boiling point above 25°C.

The observation of bromine being a liquid at 25°C reveals important details about its melting and boiling points. Since it exists as a liquid at this temperature, it signifies that its current state is beyond its melting point.

Therefore, bromine's melting point is below 25°C. However, since bromine has not transitioned into a gaseous state at 25°C, it indicates that its temperature is still below its boiling point. This suggests that the boiling point of bromine lies above 25°C.

The relatively narrow temperature range between its melting and boiling points makes bromine unique among elements and allows it to exist as a liquid at room temperature.

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1.73 minutes are required to deposit 2.61 g cr from a cr³⁺(aq) solution using a current of 2.50 a

Electroplating is a process of depositing a metal onto a conductive surface by using electrolysis. In this process, an electric current is passed through an electrolyte solution containing ions of the metal to be deposited. The metal ions are reduced at the cathode, which is the surface where the metal is being deposited. The rate at which the metal is deposited depends on the current and the time for which the current is applied.

To calculate the time required to deposit a certain amount of metal, we can use Faraday's law of electrolysis, which states that the amount of metal deposited is proportional to the amount of electric charge that passes through the cell. The equation for this is:

mass of metal deposited = (current x time x atomic mass of metal) / (Faraday's constant x charge on ion)

In this problem, we are given the current (2.50 A), the mass of metal to be deposited (2.61 g), the charge on the Cr³⁺ ion (3+), and the Faraday's constant (96,500 C/mol). The atomic mass of Cr is 52.0 g/mol.

Substituting these values into the equation, we get:

2.61 g = (2.50 A x time x 52.0 g/mol) / (96,500 C/mol x 3)

Simplifying this equation gives:

time = (2.61 g x 96,500 C/mol x 3) / (2.50 A x 52.0 g/mol)

time = 103.9 s or 1.73 minutes (rounded to two decimal places)

Therefore, it would take approximately 1.73 minutes to deposit 2.61 g of Cr from a Cr³⁺(aq) solution using a current of 2.50 A.

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Answer:

The answer is option 4.

Explanation:

Chloroplast is the place where they absorb sunlight to perform photosynthesis to produce food.

Given :

Actual value observed , \(v_a=1.92\ g/ml\).

Expected value , \(v_e=1.89\ g/ml\).

To Find :

The student's percent error.

Solution :

Percentage error is given by :

\(P=|\dfrac{v_a-v_e}{v_e}|\times 100\ \%\)

Putting given values in above equation, we get :

\(P=|\dfrac{1.92-1.89}{1.89}|\times 100\ \%\\\\P=1.587\ \%\)

Therefore, percentage error is 1.587 %.

Hence, this is the required solution.

Answer:

Proton (p for positive): Positive +1 charge, relative mass of 1

Neutron (sounds like neutral): no charge, relative mass of 1

Electron (sounds like electric): negative charge, relative mass of 0.0005

Answer:

The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

Explanation:

When dehydrated, the expected changes in urine include a decrease in volume (flow rate), an increase in solute concentration (specific density), and a potential increase in acidity (pH).

1. Urine Volume (Flow Rate):

When dehydrated, your body tries to conserve water by reducing urine production.

As a result, urine volume tends to decrease, and the flow rate may be lower than usual.

2. Solute Concentration (Specific Density):

Dehydration leads to the loss of water from the body, causing the urine to become more concentrated.

Solute concentration, measured by specific density, increases in dehydrated individuals.

The specific gravity of urine, a measure of solute concentration, typically rises when dehydrated.

3. Acidity (pH):

The normal pH range of urine is slightly acidic, typically around 6 to 7.

In cases of dehydration, the urine pH may become more acidic due to the reduced volume of water available for dilution.

However, it's important to note that the change in urine pH may vary depending on individual factors and the degree of dehydration.

It's essential to stay hydrated and maintain a balance of fluids to ensure normal urine volume, solute concentration, and acidity levels. If you have concerns about your hydration status or notice significant changes in urine characteristics, it's recommended to consult a healthcare professional for an accurate evaluation.

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Answer:

1) eathquake

earthquake is the natural calamities where there is the vertical and horizontal shaking of the

earth crust. it is cause due to overlappibg of the different plates that are present in the earth surface. when this plates intersect or expand the earth occurs

consequences are it causes loss of life and human property , degards the environment , it leads to flood, landslides etc The damage caused by earthquakes is from ground shaking, ground rupture, landslides, tsunamis, and liquefaction.

Next - volcanic eruption

its is the out flow of the larva from the inner of the earth to other surface. it is cayse due to high pressure exerted on the surface of the earth that leads to explode the inner larva.

its consequences are it degards the environment and loss of the beauty of the nature , there is loss of human life , widlife , etc. volcanic eruption include infectious disease, respiratory illness, burns, injuries from falls, and vehicle accidents related to the slippery, hazy conditions caused by ash. When warnings are heeded, the chances of adverse health effects from a volcanic eruption are very low.

The sprinter's speed after 2 seconds is 9 m/s.

Use the equation of motion to solve this problem:

v = u + at

where

v = final velocity (what we need to find)

u = initial velocity (0 m/s for a stationary object)

a = acceleration (4.5 m/s²)

t = time (2 s)

Plugging in the values:

v = 0 + (4.5 m/s²) × (2 s)

v = 9 m/s

Therefore, the sprinter's speed 2 seconds later is 9 m/s.

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Complete question:

A sprinter leaves the starting blocks with an acceleration of 4.5m/s^2. What is the sprinter's speed 2 s later?

Answer:

1. atom

2. element

3. pure substances

4. mixture

5. Homogenous Mixture/Heterogenous/Heterogenous

6. Basic

7. Similar: Both made up of atoms, have bonds connecting the atoms together, and are pure substances Different: Compounds are made up of different elemnts in a ratio, elements are distinguished by their atomic number, elements cannot be broken down into further elements

8. Heterogenous

9. Yes, as long as the elements don't have a chemical reaction with each other. Breahting air is the most common exmaple. There are many different elements in the air yet they do not react.

10. The mixture can be put through a filter to get the sugar and the black pepper by itself as the pebbles would be too large to pass through the filter. Next, the mixture can be set in water and stirred to have the sugar dissolve in the water. Since black pepper does not dissolve in water, the black pepper can be further filtered to get only the black pepper on its own. Finally, the sugar water can be evaporated to get the sugar on its own.

Explanation:

The quantity of heat released from the reaction above is -1667.46 kJ.

To calculate the quantity of heat absorbed or released in the given reaction, we can use the molar mass of Na (sodium) and the given enthalpy change (-822 kJ/mol).

First, we need to determine the number of moles of Na used. Using the molar mass of Na (22.99 g/mol), we can convert the given mass to moles:

46.7 g Na / 22.99 g/mol = 2.03 mol Na

Since the stoichiometry of the reaction is 2 moles of Na to 1 mole of Cl₂, we know that 2.03 mol Na will react with an equal number of moles of Cl₂.

Now, we can calculate the heat absorbed or released by multiplying the moles of Na by the enthalpy change:

2.03 mol Na * (-822 kJ/mol) = -1667.46 kJ

Therefore, when 46.7 g of Na and excess Cl₂ are used in the reaction, approximately -1667.46 kJ of heat is released.

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