Calculate the change in the internal energy of a gaseous system that absorbs 21 J of heat and does 8.0 J of work by expanding.

A. 32 J
B. –32 J
C. –29 J
D. 29 J
E. 13 J
F. –13 J

Answer: kinetic or A :)

Explanation: kinetic energy Alpha particles have typical kinetic energy of 5 MeV (or ≈ 0.13% of their total energy 110 TJ/kg) and have a speed of about 15 000 000 m/s or 5% of the speed of light.

hope this helped !! - hailey

The medicine that has to be given by the nurse to prevent cerebral palsy in the new-born is magnesium sulphate.

The term "cerebral palsy" refers to a collection of conditions that impair mobility and posture development and are thought to be caused by non-progressive abnormalities. Insults that caused cerebral palsy are thought to have happened during foetal development or early childhood. A significant risk factor for cerebral palsy is preterm delivery, and that risk rises sharply as gestational age decreases. Right now, 25% of all new occurrences of cerebral palsy are caused by babies delivered before 34 weeks of pregnancy. Cerebral palsy risk is higher when there are several pregnancies. MgSO4 was infused continuously at a rate of 2 g/h for up to 12 hours after a 6 g loading dose. Given before delivery, magnesium sulphate is known to regulate the vasculature and minimize hypoxia effects by neutralising cytokine or excitatory amino acid damage, which may lower the risk.

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Options:

conduct an experiment

form a hypothesis

draw a conclusion

state the cause

Answer:

'State the cause' is not part of the scientific method.

Explanation:

The scientific method has three wholistic steps:

A cause is neither a scientific term nor is it part of the  processes of experimentation.

I hope this was helpful.

The reaction as described is an addition reaction in which a saturated product is obtained.

The information we have from the question is that; the starting material is a 6 membered ring with an internal alkene between carbons 1 and 2. The product is a six membered ring with a bond to X on carbon 1 and a bond to Y on carbon 2.

We  know that an addition reaction is one in which a molecule is added across the double bond to yield  a saturated product. The reaction A described has to do with he addition of a molecule XY to a six member alkene to obtain the saturated product as described.

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Answer:

D

Explanation:

cause overall charge is +1 so will attract

The energy of the wave is 2.11 * 10^-18 J while the energy per mole is 3.5 * 10^-42 J/mol.

We know that the energy of the photon is dependent on the wavelength of the light as we know. In this case, we can see that the wavelength of the light is obtained as 94 nm. We shall now proceed to find the parameters as required in the question.

We have the following;

E = hc/λ

E = energy of the radiation

h = Plank's constant

c = speed of light

λ = wavelength

Then we have;

E = 6.6 * 10^-34 * 3* 10^8/94 * 10^-9

E = 2.11 * 10^-18 J

The energy per mole is obtained from;

2.11 * 10^-18 J/6.02 * 10^23

= 3.5 * 10^-42 J/mol

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Explanation:

if we have a neutral 15N is means that the atomic mass of it is 15.

So it has:

7 protons

7 electrons

and 15-7 = 8 neutrons

Answer: 7 protons, 7 electrons and 8 neutrons.

Intensive properties do not change as the size of an object changes but Extensive properties change as the size of an object changes; here the properties can not change because the amount of the water stays the same

The physical properties of matter can be divided into  intensive and extensive properties and the terms are introduced in 1917 by Richard C Tolman.

Intensive properties are independent of the presence of number of substance and they are bulk properties, here the Characteristic doesn’t change.

The size of intensive properties cannot change, examples are Density, temperature, pressure etc. It can not depend on the amount of matter and also intensive properties are fixed, countable.

Extensive properties are dependent on the presence of  number of substance, easily identified, Size of Extensive properties changes and  It can be computed.

extensive properties depend on the amount of matter, often changes and are not countable; For example Volume, size, mass, length, weight

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Answer:

group 15 ( the nitogen group)

Explanation:

To make the conversion from meters to nanometers we must see what is the relationship between these two units. One meter is equal to 10^9 nanometers, therefore, the equivalence will be:

Answer: 6.33x10^-3 m are equivalent to 6.33x10^6nm

Answer:

Iron?

Explanation:

Answer:

conservation of mass

Answer:

\(\lambda=3451*10^{10}m\)

Explanation:

From the question we are told that:

Energy state \(e=3.50 eV\)

Time \(t=2ms\)

Generally the equation for energy of Photon is mathematically given by

\(E=e-e_0\)

\(E=3.6*10^{-19}J\)

\(E=5.7*10^{-19}J\)

Generally the equation for Wave-length of Photon is mathematically given by

\(\lambda=\frac{hc}{E}\)

\(\lambda=\frac{6.626*10^{-34}*3*10^8}{5.76*10^{-19}}\)

\(\lambda=3451*10^{10}m\)

Answer:

Normal Fault -> Tension

Reverse Fault -> Compression

Strike-Slip Fault -> Shearing

Explanation:

Normal Fault -> Tension

[] A normal fault is when the walls are being pulled apart and is caused by tension

[] Example:

         <-       ->

Reverse Fault -> Compression

[] A reverse fault is when the walls are being pushed together and is caused by compression

[] Example:

         ->        <-

Strike-Slip Fault -> Shearing

[] A strike-slip fault is when the walls are being pushed apart in parallel directions and is caused by shearing

[] Example:

         /\         \/

Note: The page you provided also gives the answers for this specific question.

Have a nice day!

     I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather

Answer:

Independent Variable: Number of Coils Wrapped Around

Dependent Variable: Number of Paperclips Magnet Picks Up

Possible Research Question: How does the number of wire wraps affect the strength of an electromagnet?

Trends noticed in the data: As the number of wire wraps (coils) around the nail increases, the magnetic strength of the electromagnet also increases. There is a positive correlation between the number of wire wraps and the number of paper clips the magnet picks up.

Claim based on the data: The magnetic strength of an electromagnet increases as the number of wire wraps (coils) around the nail increases.

Evidence from the chart or graph supporting the claim: The graph shows that as the number of wire wraps increases from 4 to 12, the number of paper clips the magnet picks up also increases from 6 to 25. This suggests a positive correlation between the two variables.

To prepare a 1M solution of l2 in 250mls of water, you will need to add 250 grams of l2 to 250mls of water.

What do you mean by solution?

A solution is a mixture of one or more substances that have been dissolved in a solvent. It can refer to a wide variety of mixtures, including solutions in chemistry, physics, mathematics, and other fields. Solutions can be either gas, liquid, or solid in nature.

To make a 1M solution of l2 in 250mls of water, you need to add 250 grams of l2 to 250mls of water. This is because the molarity of a solution is defined as the number of moles of solute per liter of solution. Since we are making a 1M solution, this means we need 1 mole of l2 per liter of solution. Since 250mls is 0.25 liters, we need 0.25 moles of l2. Since the molar mass of l2 is 145.93 g/mol, 0.25 moles of l2 would be equal to 36.48 grams, but we must round up to the nearest whole number, which is 250 grams.

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Answer:

a network of buoys.

Explanation:

It is operated by noaa. The buoys transmit some of the data on a daily basis to NOAA through a satellite in space.

Steel is produced from pig iron through a process known as steelmaking or iron and steel production.

The pig iron obtained from the blast furnace contains high amounts of carbon, impurities, and other elements. To convert pig iron into steel, the carbon content needs to be reduced to desired levels, and impurities must be removed.One common method of steelmaking is the basic oxygen process (BOP). In this process, pig iron is placed in a vessel called a converter, where oxygen is blown through the molten metal. The oxygen reacts with the carbon and impurities, causing them to oxidize and form gases that are released. Alloying elements and desired additives can be added at this stage to achieve specific steel properties. Another method is the electric arc furnace (EAF), where an electric arc is used to heat and melt the pig iron, allowing impurities to be oxidized and removed.The advantages of using steel are numerous. Steel is strong, durable, and versatile, making it suitable for a wide range of applications. It has high tensile strength, which means it can withstand heavy loads and pressures. Steel is also resistant to corrosion, making it ideal for construction, infrastructure, and transportation projects. It is a recyclable material, contributing to sustainability and reducing environmental impact. Additionally, steel can be fabricated into various shapes and sizes, allowing for customization and flexibility in design.References:

A. Ghosh and A. Chatterjee, Ironmaking and Steelmaking: Theory and Practice, PHI Learning, 2008.

R.H. Tupkary and V.R. Tupkary, An Introduction to Modern Iron Making, Khanna Publishers, 2010.

J.R. Davis, ed., ASM Specialty Handbook: Carbon and Alloy Steels, ASM International, 1995.

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Answer:

they're examples of cell organelles

Explanation:

because it is ♥╣[-_-]╠♥

Answer:

Waters' boiling point decreases with increases in elevation because of the atmospheric pressure.

For example, the higher in elevation you are. The lower the atmospheric pressure is. In other words heated water reached boiling point quicker.

My friend, let's take an example

Say you have gone camping in the mountains. And that you meet a river on way up. From the river, you are going to take water because you know you will need it. So you took the water and continued the journey up. Now you have come to a high altitude. Now you are thirsty. We can't trust water so we boil it to kill germs and bacteria. You notice that the water has boiled quickly. Now the reason is that higher altitudes have low atmospheric pressure. So the boiling point decreases.

Now you might be wondering why I gave such a lengthy description. My aim is to tell the answer with some imagination so that it will get stuck in your head for a really long time so that you don't have to waste points and time.

Have a good day!

1 moles of a monoatomic gas increases its volume from 1 to 3 while the pressure also increases from 250 to 1000. So, the temperature of the gas increased from 30.1 K to 120.3 K.

If the temperature and the number of moles of the gas remain constant, the pressure and volume of the gas are inversely proportional to each other. This relationship is described by the ideal gas law:

PV = nRT

where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the universal gas constant, and T is the temperature of the gas. In this case, you have given that the number of moles of the gas (n) is 1 mole, the temperature (T) is constant, and the pressure (P) and volume (V) both change. We can use the ideal gas law to solve for the final temperature of the gas.

First, we can rearrange the ideal gas law to solve for T:

T = (PV)/(nR)

We can then use the initial and final values of P and V to calculate the initial and final temperatures of the gas.

Initial temperature: T1 = (250 * 1)/(1 * 8.31) = 30.1 K

Final temperature: T2 = (1000 * 3)/(1 * 8.31) = 120.3 K

Therefore, the temperature of the monoatomic gas increased from 30.1 K to 120.3 K as the volume increased from 1 to 3 while the pressure increased from 250 to 1000.

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Question- 1 moles of a monoatomic gas increases its volume from 1 to 3 while the pressure also increases from 250 to 1000. What is the change in temperature of gas is?

Answer:

A.

Carrying a 98 kg box across a room.

D.

Carrying a 98 kg box up the stairs

Answer: Hello, there! your answer is Below

D.

Carrying a 98 kg box up the stairs.

Explanation:

Work is done whenever a force moves something. Everyday examples of work include walking up stairs, lifting heavy objects, pulling a sledge and pushing a shopping trolley. Whenever work is done, energy is transferred from one place to another.

Hope this Helps you!!!

Have a great day!!!

Answer:

Method 1 isn't safe for humans.

Answer: Method 2 is not environment friendly, or D.

Explanation: Recycled water, or graywater, is very harmful to the fish and if used to contain them within the farm, it would make the fish overall very sick, and the fish would be refused from being sold into stores. Thus, this is the correct answer.

a) The balanced chemical equation for the reaction is: 2H₂ + O₂ → 2H₂O

b) the number of moles of O₂ required is approximately 1.004 moles.

c)  approximately 45 liters of H₂ and 22.5 liters of O₂ are needed to obtain 45 liters of H₂O.

a) Balancing the chemical equation:

The balanced chemical equation for the reaction is: 2H₂ + O₂ → 2H₂O

b) Calculating the number of moles of the reactants needed to obtain 45 liters of H₂O:

From the balanced equation, we can see that for every 2 moles of H₂O produced, we need 2 moles of H₂ and 1 mole of O₂. Since the stoichiometry is based on moles, we need to convert the given volume of H2O into moles.

To convert volume to moles, we need to use the ideal gas law, PV = nRT. At standard temperature and pressure (STP), the molar volume of an ideal gas is 22.4 liters.

Given that we have 45 liters of H2O, we can calculate the number of moles as follows:

moles of H₂O = (volume of H₂O) / (molar volume at STP)

            = 45 liters / 22.4 liters/mol

            ≈ 2.008 moles of H₂O

Since the stoichiometry of the reaction is 2 moles of H₂O for every 2 moles of H₂, we need an equal number of moles of H₂. Therefore, the number of moles of H₂ required is also approximately 2.008 moles.

For O₂, since the stoichiometry is 1 mole of O₂ for every 2 moles of H₂O, we need half the number of moles of H₂O. Thus, the number of moles of O₂required is approximately 1.004 moles.

c)  the volume of the reactants:

Since the stoichiometry of the balanced equation is 2 moles of H₂for every 1 mole of O₂ and 2 moles of H₂O, we can deduce the volume of the reactants based on their molar volumes at STP.

For 2.008 moles of H₂, the volume can be calculated as follows:

volume of H₂= (moles of H₂) * (molar volume at STP)

            = 2.008 moles * 22.4 liters/mol

            ≈ 45 liters of H₂

For 1.004 moles of O₂, the volume can be calculated similarly:

volume of O₂= (moles of O₂) * (molar volume at STP)

            = 1.004 moles * 22.4 liters/mol

            ≈ 22.5 liters of O₂

Therefore, approximately 45 liters of H₂and 22.5 liters of O₂ are needed to obtain 45 liters of H₂O

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Answer:

As the temperature of water increases, the speed of sound waves traveling through it also increases. Therefore, if the water temperature increases from 0°C to 20°C, the speed of the sound wave traveling through it will increase.

The speed of a sound wave in water will increase if the water's temperature increases from 0°C to 20°C due to increased particle collisions resulting from higher kinetic energy.

The best statement that describes how the speed of a wave will change if the water temperature increases from 0°C to 20°C is - The wave speed will increase because the particles will collide more frequently.

This is because an increase in temperature of a fluid (like water) results in an increase in the speed of sound through it. When the temperature increases, the kinetic energy of the particles also increases. As a result, these molecules move around faster, thereby leading to increased collisions which essentially helps the sound wave to propagate faster. So, the speed of the sound wave increases with an increase in temperature.

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Answer:

see attachment

Explanation:

see attachment for your answer.

Hope this helps.

-Rishabh

We must melt about 3.8 kg of brass A, 4.1 kg of brass B, and 6.5 kg of brass C to obtain about 14.5 kg of the desired alloy

we can set up a system of equations based on the conservation of mass and the desired composition:

0.533x + 0.247y + 0.220z = 14.5 (desired composition of copper, zinc, and nickel)

The given information includes:

Brass A: 41% copper, 23% zinc, 36% nickel

Brass B: 54% copper, 23% zinc, 23% nickel

Brass C: 56% copper, 26% zinc, 18% nickel

Using this information, we can write the following equations:

0.41x + 0.54y + 0.56z = 0.533(x + y + z) (copper)

0.23x + 0.23y + 0.26z = 0.247(x + y + z) (zinc)

0.36x + 0.23y + 0.18z = 0.220(x + y + z) (nickel)

Simplifying each equation, we get:

0.067x - 0.027y - 0.023z = 0 (copper)

-0.017x + 0.017y + 0.003z = 0 (zinc)

-0.020x - 0.027y + 0.038z = 0 (nickel)

We can solve the equations using substitution method or elimination method and our values will be:

x = 3.8462

y = 4.1077

z = 6.5461

In conclusion, we need to melt about 3.8 kg of brass A, 4.1 kg of brass B, and 6.5 kg of brass C to obtain about 14.5 kg of the desired alloy.

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