match the name of the following polyatomic ions to the correct symbol

See , from the equation we can see that for forming two mole of H2O 2Mole of H2 has to react.

Mass of 2 Mole H2O is 18*2gm or 36gm.

So for forming 36 gm H2O 2×2 I.e. 4 gm H2 has to take part in reaction.

Therefore, to form 1 gm H2O 4÷36 gm of H2 has to take part.

So, for forming 47gm H2O (4÷36)×47 gm H2 has to take part

I.e. 5.22 gm of H2 has to take part

So, ans is 5.22 gm of hydrogen.

Hope it helps!!!

Answer: Mass of hydrogen gas that must react will be 5.22 grams.

Explanation:

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]   ....(1)

Given mass of water = 47 g

Molar mass of water = 18 g/mol

Putting values in above equation, we get:

[tex]\text{Moles of }H_2O=\frac{47g}{18g/mol}=2.61mol[/tex]

For the given balanced chemical equation:

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

By Stoichiometry of the reaction:

2 moles of water are formed from 2 moles of hydrogen gas.

So, 2.61 moles of water will be formed from [tex]\frac{2}{2}\times 2.61=2.61mol[/tex] of hydrogen gas.

Now, calculating the mass of hydrogen by using equation 1:

Moles of hydrogen gas = 2.61 moles

Molar mass of hydrogen gas = 2 g/mol

Putting values in equation 1, we get:

[tex]2.61mol=\frac{\text{Mass of hydrogen gas}}{2g/mol}\\\\\text{Mass of hydrogen gas}=5.22g[/tex]

Hence, mass of hydrogen gas that must react will be 5.22 grams.

Hydrogen bonding, a particularly strong dipole-dipole force, causes a powerful attraction between water molecules, which results in a high boiling point.

Answer is: electrons.

According to the Bohr model of the atom:

1. Electrons orbit the nucleus in orbits that have a set size and energy.

2. Energy levels of electrons are discrete (certain discrete values of energy).

3. Electrons can jump from one energy level to another, absorbing or emitting electromagnetic radiation with a frequency ν (energy difference of the levels).

The electron (symbol: e⁻) is a subatomic particle whose electric charge is negative one elementary charge.

Proton is a subatomic particle with a positive electric charge of +1e elementary charge.

Beside negatively charged electrons, atoms have positively charged protons, so atoms have neutral charge.

Answer: D relative humidity

Explanation: Just took the test.

Relative Humidity is the amount of water vapor in air, as a percentage of the maximum amount the air could hold at the same temperature. The other options refer to different concepts in weather science and chemistry.

The amount of water vapor in the air, compared to the maximum amount that can be held at a specific air temperature is called Relative Humidity. This term is a measure used in weather science to describe the percentage of moisture in the air in relation to the maximum amount the air could hold at the same temperature.

For example, if the Relative Humidity is 50%, it means that the air is carrying 50% of the total moisture it could hold at that particular temperature.

Other options like Dew Point, Precipitation, and Crystallization refer to different concepts. Dew Point is the temperature at which the air is saturated and water vapor begins to condense into dew. Precipitation is any form of water particles, liquid or solid, that fall from the atmosphere and reach the ground. Crystallization is a process in chemistry involving the formation of solid crystals from a homogeneous solution.

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Answer:

Seeing The 50 N upwards and Ur mom meaning:

Explanation:

Ur Mom banged the 50 N

the answer is the first one aneroid measures air pressure using a metal chamber thats sensitive to pressure changes and is using no liquid.

Aneroid

Aneroid Barometers if anybody have a barometer at home , it is probably an aneroid barometer . The word aneroid means with out liquid .An aneroid barometer has an airtight metal chamber , as shown in figure 6 metal chamber is sensitive to change in air pressure.

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I think it is A. DSM

Psychologists and psychiatrists use the Diagnostic and Statistical Manual of Mental Disorders (DSM) to diagnose mental disorders, with the current version being DSM-5, published by the American Psychiatric Association in 2013.

Psychologists and psychiatrists diagnose mental disorders in patients using the Diagnostic and Statistical Manual of Mental Disorders (DSM). This manual provides a comprehensive set of criteria for diagnosing various mental health conditions.

It includes detailed descriptions of each disorder, diagnostic criteria, prevalence information, and associated risk factors. The DSM is not only utilized by mental health professionals but also by researchers, health insurance companies, and policymakers. Developed and published by the American Psychiatric Association, the DSM has undergone several revisions, with the most recent edition being DSM-5, released in 2013.

The correct answer to the question of which tool allows professionals to diagnose mental disorders is D. Diagnostic and Statistical Manual of Mental Disorders.

Final answer:

The cell membrane regulates the movement of materials in and out of the cell through selective permeability and transport proteins.

Explanation:

The cell membrane is responsible for regulating the movement of materials in and out of the cell. It is selectively permeable, allowing some substances to pass through while blocking others. This selective permeability helps to maintain the internal environment of the cell and ensures the cell's survival.

Transport proteins in the cell membrane act as channels or pumps to facilitate the movement of specific molecules in and out of the cell. These proteins play a crucial role in maintaining the balance of salts, nutrients, and proteins within the cell.

An example of a transport protein is ion channels. Ion channels regulate the movement of ions such as sodium, potassium, calcium, and chloride across the cell membrane. These ions are essential for various cellular processes and maintaining membrane potential.

Answer : The kinetic energy is, [tex]3.716\times 10^{3}J/mol[/tex]

Explanation :

The formula for kinetic energy is:

[tex]K.E=\frac{3}{2}RT[/tex]

where,

R = gas constant = 8.314 J/mol.K

T = temperature = [tex]25.0^oC=273+25.0=298.0K[/tex]

Now put all the given values in the above kinetic energy formula, we get:

[tex]K.E=\frac{3}{2}\times (8.314J/mol.K)\times (298.0K)[/tex]

[tex]K.E=3.716\times 10^{3}J/mol[/tex]

Therefore, the kinetic energy is, [tex]3.716\times 10^{3}J/mol[/tex]

The answer to this question is A. Humidity.. because humitity causes steam

the answer is C. water vapor

Answer : The correct option is, (D) Velocity

Explanation :

Velocity : It measures the speed of an object in a particular direction. It is a vector quantity. It depends on the magnitude and the direction. The S.I unit of velocity is, [tex]m/s[/tex]

Distance : It measures the length between the two objects. The S.I unit of distance is, meter.

Speed : It is defined as the distance traveled per unit of time. It does not have a direction. The S.I unit of speed is, [tex]m/s[/tex]

Acceleration : It is defined as the rate of change of velocity of an object with respect to time. The S.I unit of acceleration is, [tex]m/s^2[/tex]

Hence, the motion we can determine from the given data is, velocity.

You are riding a bicycle home from school. The average speed 5 m/s headed towards south.The motion that determine from this data is D. Velocity .

You can determine the velocity from the given data, as it includes both the speed (5 m/s) and the direction (south).

It is important to distinguish between speed and velocity:

Correct question is: You are riding a bicycle home from school. The average speed 5 m/s headed towards south. What motion can you determine from this data?
A. Acceleration
B. Distance
C. Speed
D. Velocity

The correct answer is option B, that is, add 1.46 grams of NaCl to 250 milliliters of H₂O.

First there is a need to find the moles of NaCl in 250 ml of 0.10 M NaCl,

Moles of NaCl = molarity × volume = 0.10 M × (250/1000L) = 0.025 mol

The corresponding mass of NaCl is,

Mass of NaCl = moles × molar mass = 0.025 mol × 58.5 g/mol = 1.46 g

Thus, there is a need to dissolve 1.46 grams of NaCl solid into 50 ml of H₂O and dilute to 250 ml.

The most appropriate procedure to prepare a 0.10 M NaCl solution with a volume of 250.0 mL is to dissolve 1.46 g of NaCl in 50 mL of water and dilute to 250 mL.

The most appropriate procedure to prepare a 0.10 M NaCl solution with a volume of 250.0 mL is option D. Dissolve 1.46 g of NaCl in 50 mL of H2O and dilute to 250 mL.

To determine the amount of NaCl needed, we can use the molarity formula:

Molarity = (moles of solute) / (volume of solution in liters)

Using the given molarity of 0.10 M and the volume of 0.250 L (250 mL), we can rearrange the formula to solve for moles of solute:

moles of solute = molarity * volume of solution

Substituting the values, we get:

moles of solute = (0.10 M) * (0.250 L) = 0.025 moles

And finally, we can calculate the mass of NaCl needed using the molar mass:

mass = moles of solute * molar mass

mass = (0.025 moles) * (58.4 g/mol) = 1.46 g

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98.857g Na

To find this, set up an equation as so:

4.3 mol Na = [tex]\frac{22.99g Na}{1 mol Na}[/tex]

Multiply everything on the top and divide that by everything on the bottom to get the final answer of 98.857g Na.

Hope this helps!

The substances and their chemical formulas are: water (H2O), hydrogen ion (H+), hydronium ion (H3O), and hydroxide ion (OH-)

1. H+ matches with the chemical formula H2O, which represents water.

2. H2O matches with the chemical formula H2O, which represents water.

3. H3O matches with the chemical formula H3O, which represents the hydronium ion.

4. OH- matches with the chemical formula OH-, which represents the hydroxide ion.

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Hey There,

When one nucleus after another is split,

C) A chain reaction begins

Best Of Luck,

- I.A. -

Answer: A chain reaction begins

The electromagnetic spectrum encompasses all electromagnetic wave frequencies, including visible light, option C is correct. A television remote control does not use radio waves but instead uses infrared light, option D is correct. A material that lets some light pass through, creating a diffused effect, is termed translucent, option C is correct.

The entire range of electromagnetic wave frequencies is known as the electromagnetic spectrum. This spectrum includes all types of electromagnetic radiation, from radio waves and microwaves to infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. The electromagnetic spectrum is categorized by wavelength or frequency, with radio waves being at the low-frequency end and gamma rays at the high-frequency end, option C is correct,

Among the devices listed, the one that does not utilize radio waves is a television remote control. Instead, a television remote typically uses infrared light to communicate with the television. Radio waves are widely used in telecommunications, such as by cellular telephones, radar systems, and satellites to transmit and receive signals, option D is correct.

A material that allows only some light to pass through, neither completely transparent nor completely opaque, is described as translucent. Translucent materials may scatter light as it passes through, allowing light to pass but not detailed images, creating a softer, diffused effect. Examples of translucent materials include frosted glass and some plastics, option C is correct.

12.  The answer is; the satellite cools off by radiation

In the vacuum of space, there is no medium for convectional heat transfer. Only electromagnetic radiation transfer energy through space. The satellite will, therefore, lose heat through infra-red radiation, not convection.

13.   The answer is; heat will transfer to her feet by conduction

When the beachgoer wears her sandals, he makes contact with the sandals and his foot and sandal becomes one thermodynamic system.  The heat transfer by conduction, as it passes through the skin, seeks thermal equilibrium.  

15.  The answer is; elastic potential to kinetic

The more the string of the bow is pulled, the higher the elastic potential energy it gains. This is because the string is stretched and has the capacity to restore normal size when released.  When the string is released and begins to rapidly restore, it transfers this energy to the arrow, pushing the arrow forward.

16.    The answer is; Reduced friction means increased efficiency.

By lubricating the moving components of the engine, friction is reduced. Friction causes a loss of energy as the energy is lost through heat as the components rub against one another. Reduction of friction, therefore, reduces this loss and more energy is channeled towards the drive shaft.

17.  The answer is; It increases friction by air resistance.

A parachute is designed to increase drag exceptionally hence reduce the speed of a moving object drastically. Drag is induced by frictional resistance. When the parachute deploys, air is impeded from passing smoothly over the parachute hence enormous air resistance is developed causing the space shuttle to reduce speed.  

This answer explains concepts related to satellite cooling, heat transfer in sandals, potential energy of particles, energy changes in a bow and arrow, and the effect of reducing friction in an engine.

12. When a satellite in space receives no direct sunlight, it cools off by radiation.

13. When a beachgoer leaves her sandals on the shore and puts them back on after swimming, the bottom of her feet feel hot because the sandals were warmed by radiation.

14. In the given scenario, particle C has the greatest potential energy.

15. As a bow is drawn and released, the energy change that occurs is from elastic potential to kinetic.

16. Reducing friction in an engine will result in reduced heat transfer.

17. The parachute helps the space shuttle come to a complete stop during landing by increasing friction by air resistance.

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1.atoms

2.two

3. Elements are combined to make compounds

4.fewer

5. Larger  

6. Starch is made up of three Elements.

I’m not sure about the other two but I hope this helped!!

Answer: Isabel has to recall the information about using a manual stick shift. For this reason, she is using long-term, explicit, declarative and episodic memory system.

Human memory system can be broadly classified as: sensory memory, short-term memory and long-term memory.

Long-term memory is used to recall information. If the information are about facts, events and experiences then explicit, declarative and episodic memory helps to recall all information. This will help Isabel to recall all information about driving a car with a manual stick shift and she will be able to drive her sister's car.

Isabel is using her procedural memory system to recall the information needed to operate a manual stick shift car. Procedural memory is a type of long-term memory that stores information about how to perform various skills and tasks, including those that involve motor skills and sequences of actions.

In this case, Isabel has previously learned how to operate a manual transmission car, and this knowledge is stored in her procedural memory. However, after many years of driving an automatic car, the specific motor skills and sequential actions required to shift gears in a manual car may have become less automatic for her.

When she gets into her sister's car with a manual transmission, she needs a few minutes to reacquaint herself with the physical movements and coordination required to shift gears. During this process, she is accessing her procedural memory to retrieve the previously learned information about operating a manual stick shift, and her brain is working to reestablish the neural pathways and muscle memory associated with this skill.

To learn more about procedural, click here.

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The molecules  of hydrogen gas that are  formed is  when 48.7 g  of sodium are added to water  is  6.375  x 10²³  molecules

  calculation

2 Na +2H₂O →  2 NaOH  +H₂

Step 1: find the moles  of sodium (Na)

moles =mass÷   molar mass

from periodic table the molar mass of Na = 23 g/mol

moles= 48.7 g÷ 23 g/mol =2.117 moles

Step 2:use the mole ratio to determine  the  moles of H₂

  from  given equation  Na:H₂ is 2:1

therefore the moles  of H₂ = 2.117 moles x 1/2=1.059 moles

Step 3: find the molecules of H₂ using the Avogadro's law

According  to  Avogadro's  law  1 mole = 6.02 x 10²³ molecules

                                                      1.059 moles = ?  molecules

by cross multiplication

= [(1.059 moles x 6.02 x10²³  molecules) /  1 mole] =6.375  x 10²³  molecules

43 degrees

angle of reflection is equal to the angle of incidence

The answers that apply are;

When air is compressed, it means the same volume of space is occupied by more air molecules. This, therefore, means that the molecules are hitting each other with a higher frequency hence become hotter with more compression. It weighs more because there are more molecules in the same volume of space.

Answer:

air weighs more

air molecules are closer together  

air is colder

Explanation: Trust me, I did the test and it was correct

Answer:

Copper and Iron

Explanation:

Metals, like copper and iron, are good conductors of heat; that is because  metals are bounded by a 'cloud' of free electrons and these electrons can carry easily kinetic energy through the metal

On the other hand, foam and wood are isolators, that is, they are bad conductors of heat.

Answer:

B

Explanation:

True!

Energy can change from Potential to Kinetic and so on.

This is actually called energy transformation!

Knowing the mass and radius of the Earth and the distance of the Earth from the sun, we can calculate the mass of the sun (right), again by using the law of universal gravitation. The gravitational attraction between the Earth and the sun is G times the sun's mass times the Earth's mass, divided by the distance between the Earth and the sun squared. This attraction must be equal to the centripetal force needed to keep the earth in its (almost circular) orbit around the sun. The centripetal force is the Earth's mass times the square of its speed divided by its distance from the sun. By astronomically determining the distance to the sun, we can calculate the earth's speed around the sun and hence the sun's mass.

Astronomers determine the gravitational force between celestial objects by observing their motion and applying Kepler's law together with the Doppler effect. This allows the calculation of the masses involved and hence gravitational forces. These methods work for celestial bodies near or far.

Astronomers determine the gravitational force between two celestial objects indirectly by using observations and mathematical laws. For example, by observing the orbits of stars close to the galactic center and using Kepler's third law, we can estimate the mass of a black hole in a far-off galaxy. Similarly, by measuring the orbital speed of gas in the rotating accretion disk of distant galaxies, we can calculate the gravitational force exerted by the central object.

The Doppler effect is another important tool in this process, which is used to measure radial velocities of the orbiting material and thus derive the speed at which it moves around. This speed tells us about the central body's gravitational force. Gravitational effects between two bodies also allow the calculation of masses of astronomical objects.

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Gastrointestinal Tract. Radiation damage to the intestinal tract lining will cause nausea, bloody vomiting and diarrhea. This is occurs when the victim's exposure is 200 rems or more. The radiation will begin to destroy the cells in the body that divide rapidly.

Answer: the correct answer is

Explanation:

Electrons are the negatively charged particles present inside the atom revolving around the nucleus. These are the subatomic particles of an atom but along with this they also exhibit wave nature explained by french scientist De Broglie.

Photon is discrete packet of energy of an electromagnetic radiation.They exhibit both properties of wave and particle. Photons exhibit's particle nature in photoelectric effect and wave nature in interference experiments.

Hence, the correct answer is option (B).