Define diffusion use the words concentration gradient in a sentence.

Answer:

Explanation:

Driving a car (burning gas is a chemical change) and almost all the plastics we use are made by chemical reactions of different components.

The upthrust keeps a ship afloat. The upthrust keeps swimmers on top of the water. Things weigh less in water.

The upward force exerted on a body by the fluid in which the body is submerged is called the upthrust or buoyant force. The property of liquid to exert an upward force on a body immersed in it is called buoyancy. Being a force upthrust is measured in newton or kgf in the system of international units. Examples Pushing an empty can into water experiences the buoyant force. Pushing a cork into water into water experiences the buoyant force. Reason for Upthrust The thrust ating on on the sides of walls of the body get neutralised because they are equal in magnitude and opposite in the directions. There is a pressure difference between the lower and upper faces of block. Since force is the product of pressure and area, The difference in pressure due to liquid is on th two faces of causes a net upward force called upthrust on the body immersed in the fluid.

Answer: upthrust an upward force exerted by a fluid that opposes the weight of an immersed object.It is the force that pushes an object up. ... the upward force that a liquid or gas exerts on a body floating in it.

When a body is placed in water, Up thrust = V x d x g

From the above formula we can say that the following are the factors that affect up thrust:

Acceleration due to gravity - (g)

Density of the liquid - (d)

Volume of the body submerged in the liquid - (V), or volume of the liquid displaced (v)

Explanation:

Physical changes only change the state of substance not it's chemical composition.

Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.

Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.

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Your question is incomplete , but most probably your full question was,how does physical changes work?

The molarity of this solution is 0.150M if it is made by adding 2.50 pounds of ammonium nitrate to 25.00 gallons of water.

The molarity of this solution can be determined by using the following formula;

Molarity = number of moles ÷ volume

The number of moles of ammonium nitrate can be calculated as follows;

Mole = mass (M) / Molar mass (MM)

Atomic mass of N= 14, H=1, O=16; therefore

Molar mass of ammonium nitrate = 14 + 1(4) + 14 + 16(3)

Molar mass of ammonium nitrate = 14 + 4 + 14 + 48

Molar mass of ammonium nitrate = 80g/mol

Now we convert the given pounds of ammonium nitrate into grams as follows;

1 pounds = 454g

2.50 pounds = 2.50 × 454 g = 1135g

Hence mole of ammonium nitrate = 1135 / 80 = 14.19 moles

Now using the formula of molarity to determine the molarity of this solution as follows;

Molarity of ammonium nitrate in water (solution) = number of moles of ammonium nitrate ÷ volume of water

Converting gallons into litres as follows;

1 gallon = 3.79Litres

25 gallons = 25 × 3.79 litres = 94.75 litres

Therefore, Molarity = 14.19 / 94.75

Molarity of ammonium nitrate solution = 0.150M

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Answer:

The students should create a project in which they each look at a unique trait that each have (for example, detached ear lobes) and look at their parents to see if they too have this trait. To take it a step further, look at their grandparents for this trait, and ask them about their parents and if they have this trait, this could tell them whether the trait has always, been apparent within the family, if it skipped a generation, or the genetics of one parents were more dominant then the other.

The substance combined with germanium that will cause the germanium to emit free electrons is the aluminum. Correct answer: letter D.

Adding aluminum to germanium will cause the germanium to emit free electrons. This is because aluminum has one more electron in its outermost shell than germanium does. When the two atoms are combined, the extra electron from the aluminum will fill the outermost shell of the germanium atom, and the germanium atom will then become unstable and emit an electron.

Aluminum and germanium are elements of the periodic table. Some similarities between the two are:

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Answer:

[H₂] = 0.0011M

Explanation:

Based on the chemical equation:

H₂(g) + I₂(g) ⇄ 2HI(g)

And Kc is defined as:

Kc = [HI]² / [H₂] [I₂]

Where Kc = 54

And [] represents equilibrium concentration of each compund.

Replacing:

54 = [0.030M]² / [H₂] [0.015]

[H₂] = [0.030M]² / 54* [0.015]

A preheat coil is used on an energy-recovery wheel to address two main reasons: to prevent frost formation and to improve energy efficiency.

Frost formation is a common issue in energy-recovery systems, especially in colder climates or during winter months. When cold outdoor air passes through the energy-recovery wheel, the moisture in the air can condense and freeze on the wheel's surface.

This frost buildup reduces the wheel's effectiveness in transferring heat and can even lead to operational issues.

By incorporating a preheat coil, the incoming outdoor air is warmed up before it reaches the energy-recovery wheel, preventing frost formation and ensuring continuous operation.

The second reason for using a preheat coil is to improve energy efficiency. In some situations, the outdoor air may be too cold for the energy-recovery wheel to effectively transfer heat.

By preheating the outdoor air using a coil, the incoming air temperature is raised to a level that allows for more efficient heat transfer within the wheel.

This enhances the overall energy-recovery process, reducing the workload on the primary heating system and improving the HVAC system's efficiency.

In summary, a preheat coil is used on an energy-recovery wheel to prevent frost formation and improve energy efficiency by raising the temperature of the incoming outdoor air.

This ensures uninterrupted operation, enhances heat transfer, and optimizes the performance of the energy-recovery system, particularly in colder climates or during winter seasons.

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Answer:

False.

Explanation:

Dimensional analysis is a way of converting quantities. The study of space and time is cosmology.

By the use of the Boyle's law as we can see in the solution below, the pressure is  51.5 units.

Boyle's law is a principle in physics that describes the relationship between the pressure and volume of a gas at a constant temperature.

It states that the pressure of a gas is inversely proportional to its volume, meaning that if the volume of a gas is decreased, the pressure will increase proportionally, and if the volume is increased, the pressure will decrease proportionally.

Using the Boyles law;

P1V1 = P2V2

P2 = P1V1/V2

P2 = 12.8 * 40.2/10

P2 = 51.5

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A small amount of heat Q flows from a system A at high temperature (350K) to a system B at low temperature (250K). If Q = 0. 5 J, mA = 1. 2 kg, and mB = 0. 6 kg, the total entropy change of the system be 0.00057J/K.

Firstly we will be taking Q as a positive number,

Then, the entropy lost by A is Q/TA

= (-0.5 J)/(350 K)

= -1/700 J/K

= -0.00143 J/K.

Now, the entropy gain by B is Q/TB

= (0.5 J)/(250 K)

= 1/500 J/K

= +0.00200 J/K.

Therefore, the total entropy change of the system will be the the sum of entropy lost by A and entropy gain by B.

Hence the total entropy would be =0.00057 J/K.

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Answer:

only 2 electrons can be occupied in atomic orbital.

Answer:

Explanations:

Here,we want to get the new pressure of the gas

To get this, we have to use the gas law that relates volume and pressure

This is the Boyle's law and it can be represented as follows:

Where 1 represents the initial values and 2 represents the final values

We have to convert the volumes to the same scale

We have to convert the liters to ml by multiplying by 1000

We have this as 1.42 * 1000 = 1420 mL

The values are:

Initial

Pressure = 21.31 kPa

Volume = 342.41 mL

Final

Pressure =?

Volume = 1420 mL

We substitute the values as follows:

I'm pretty sure the answer is A.

Answer:

where is the answer??

Please do not just take the points without awnsering the question.

Answer:

Hey there!

22.0 has three significant figures.

Let me know if this helps :)

Answer:

65.0 g NH3 x

mol NH3

17.04 g NH3

x  

6.02x1023 NH3 molecules

mol NH3

= 2.30x1024 NH3 molecules

(have uh good day)

Answer:

mole of Neon = 65L/22.4L

=2.901moles of Neon

1 mole of a substance contains 6.022x10^23atoms

So 2.901moles will contains

2.901 x 6.022x10^23atoms

=1.747 x 10^24atoms

Answer:

6 liquids

Explanation:

because yea

Graduated cylinder is used for accuracy

1nm=10^-6 cm.

476 nm = 4.76E-5 cm

The average velocity of an object that travels a total displacement of 24 meters in 3 seconds is 8 m/sec.

The term average velocity is defined as the ratio of the total distance traveled by the object to the total time taken by the object to cover that amount of distance.

Average velocity is calculated by dividing the displacement by the total time.

Given:

Displacement = 24 meters

Time =  3 seconds

By using the formula as follows:

Average speed = Total distance / Total time

S = 24 / 3

S = 8 m/sec.

Thus, the average speed of the object is 8 m/sec’s.

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Heree some the properties of salts:

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The decomposition of 58.67 grams of mercury(II) oxide (HgO) should have produced  4.33 grams of oxygen (\(O_2\)).

The chemical equation for the decomposition of mercury(II) oxide is:

\(2 HgO \rightarrow 2 Hg + O_2\)

From the equation, we can see that 2 moles of mercury(II) oxide produce 1 mole of oxygen gas. The molar mass of HgO is 216.59 g/mol, while the molar mass of O2 is 32.00 g/mol.

First, we need to calculate the number of moles of HgO that were decomposed:

moles of HgO = mass of HgO / molar mass of HgO

moles of HgO = 58.67 g / 216.59 g/mol

moles of HgO = 0.2709 mol

According to the chemical equation, 2 moles of HgO produce 1 mole of O2. Therefore, the number of moles of O2 produced can be calculated as follows:

moles of \(O_2\) = 0.2709 mol / 2 = 0.1355 mol

Finally, we can calculate the mass of \(O_2\) produced:

mass of \(O_2\) = moles of \(O_2\) x molar mass of \(O_2\)

mass of \(O_2\) = 0.1355 mol x 32.00 g/mol

mass of \(O_2\) = 4.33 g

Therefore, 4.33 grams of oxygen should have been produced.

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Answer:

80C

Explanation:

As a substance gets hotter, or as a substance gets closer to the state of gas, the particles in the substance move faster, become more spread out and have more energy. This is why Gas has the most energy while solids have the least. Therefore, the hotter a substance is the more energy it has.

A glass of water at 80°C will have the most amount of energy

Explanation:

So, from this, we can conclude that glass with water at a higher temperature that is 80°C will have a  higher amount of energy than a glass of water at 20°C.

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Answer:

non of them it is

halogen elements

The ideal gas law relates to the pressure, volume, and temperature of the gas. The volume of the gas bubble at 99.3 kPa is 73.47 mL.

The inverse relationship between the pressure and the volume of the gas at constant temperature is given by Boyle's law. The formula for the Boyle's law is given as:

\(\rm P_{1}V_{1} = P_{2}V_{2}\)

Given,

Initial pressure = 1.60 atm

Initial volume =45.0 mL

Final pressure = 0.98 atm (1 atm = 101.325 kPa)

The final volume is calculated as:

1.60 * 45 = 0.98 * V

V = 73.47 mL

Therefore, the volume of the gas bubble is 73.47 mL.

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The balanced chemical equation for the reaction between iron oxide and carbon dioxide can be given by: Fe2O3 + 3CO2 → 2FeCO3. The above equation indicates that for every 3 moles of carbon dioxide, 1 mole of Fe2O3 is consumed in the reaction.

Hence, to produce 12 moles of carbon dioxide, we can set up a proportion that relates to the number of moles of Fe2O3 required for the reaction.

The proportion can be given as:3 moles CO2 / 1 mole Fe2O3 = 12 moles CO2 / x moles Fe2O3.

Cross-multiplying the above equation, we get:3 moles CO2 × x moles Fe2O3 = 12 moles CO2 × 1 mole Fe2O3.

Simplifying further, we get:x moles Fe2O3 = (12/3) moles CO2 = 4 moles CO2.

Hence, 4 moles of iron oxide would be required to produce 12 moles of carbon dioxide.

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Answer:

The rate reduces by a factor cf /2.

Answer:

All 3

Explanation:

Decomposers break apart complex organic materials into more elementary substances: water and carbon dioxide, plus simple compounds containing nitrogen, phosphorus, and calcium. All of these components are substances that plants need to grow.

Some decomposers are specialized and break down only a certain kind of dead organism. Others are generalists that feed on lots of different materials. Thanks to decomposers, nutrients get added back to the soil or water, so the producers can use them to grow and reproduce.