A system undergoes a two-step process. In step 1, it absorbs . J of heat at constant volume. In step , it releases J of heat at atm as it is returned to its original internal energy. Find the change in the volume of the system during the second step and identify it as an expansion or compression.

Answer:

C = 2

D = 6

E = 1

Explanation:

just took the test :)

Answer: theres 5

Explanation: valence electrons are the electrons in the outer shell. I took that test a few weeks ago :0

Answer:  2.36 grams

Explanation:   One molecule of NaCl has an atomic mass of 58.4 amu.  That consists of one atom each of sodium (23 amu) and chlorine (35.4 amu).

Na  23                     (23/58.4)    = 0.3934

Cl   35.4                  (35.4/58.4) = 0.6066

      58.4 amu

For Na:  (6 grams)*(0.3934) = 2.36 grams

Explanation:

Valence electrons are those electrons found in the outermost shell of an atom. In other words, these are the electrons that can be gained or lost during a chemical reaction.

Answer:

By their properties ;)

Explanation:

\(\Large \boxed{\sf by \ their \ properties}\)

Every element has a set of particular characteristics. Each has a unique atomic and mass number because they contain a different ratio of protons and neutrons. The number of protons in an element mirrors the element's atomic number. The mass number equals the sum of the element's protons and neutrons.

According to increasing atomic numbers, chemical elements get organized. Periods and groups are the names of the horizontal rows and vertical columns, respectively. The chemical characteristics of elements within the same group are comparable due to their similar valency and number of outer electrons.

Answer:

the method is fractional distillation

1) a) The apparatus that can be used to separate a mixture of ethanol and water is called a fractional distillation apparatus. It consists of the following components:

b) The method of separation used in this apparatus is called fractional distillation.

2) In fractional distillation, the fractionating column provides additional surfaces for the vaporized components to condense and revalorize.

Distillation flask: This is a round-bottomed flask where the mixture of ethanol and water is initially placed.

Fractionating column: A long column with several glass beads or plates. It provides a large surface area for the vaporized components to condense and revalorize, aiding in the separation process.

Thermometer: It is placed at the top of the fractionating column to monitor the temperature during the distillation process.

Condenser: It is a coiled glass tube connected to the fractionating column. Cold water flows through the condenser, causing the vaporized components to condense back into liquid form.

Receiver flask: This is where the separated components are collected. The receiver flask is placed at the end of the condenser.

b) The method of separation used in this apparatus is called fractional distillation. Fractional distillation is employed when the components of a mixture have similar boiling points. In the case of ethanol and water, they form an azeotropic mixture with a boiling point of around 78.2°C. Simple distillation would not effectively separate these two components because they would boil together and vaporize simultaneously.

In fractional distillation, the fractionating column provides additional surfaces for the vaporized components to condense and revaporize. This repeated condensation and revalorization process allows for more efficient separation. The higher surface area in the fractionating column helps to achieve better separation of the ethanol and water, resulting in a more concentrated sample of ethanol in the distillate collected in the receiver flask.

To know more about fractional distillation

https://brainly.com/question/31829945

#SPJ2

The student would feel cold when they touch the outside of the evaporating dish. This is because the rehydration process is an endothermic process.

An endothermic process is one that absorbs heat from the surroundings, causing the surroundings to feel cold. In this case, the water is absorbing heat from the evaporating dish, causing the dish to feel cold to the touch. It is important to remember that rehydration is the process of adding water to a substance to restore its original state. In this case, the substance is rehydrated by the addition of water, and the process is endothermic because it is absorbing heat from the surroundings.

Learn more about endothermic reactions: https://brainly.com/question/1160007

#SPJ11

Answer:

the water which are very healthy is known as hydrated water

The IUPAC names of the compound 8 is propional and compound 9 is propanone or ethyl methyl ketone.

International Union of Pure and Applied Chemistry, IUPAC, is naming of the organic compound by the rules of chemistry.

There are some rules, like identifying the functional group, to find the longest carbon chain.

Thus, the  IUPAC names of the compound 8 is propional and compound 9 is propanone or ethyl methyl ketone.

Learn more about IUPAC name

https://brainly.com/question/16631447

#SPJ1

The correct answer is D) 6.5 kJ. The explanation for this is as follows:When a reaction takes place against a vacuum (i.e., zero external pressure), no pressure-volume work is done. Thus, we can use the equation ΔE=q+w, where ΔE is the change in internal energy

, q is the heat absorbed or released, and w is the work done on or by the system. Since the question only asks for the work done, we can ignore q, which means ΔE=w. Therefore, we need to calculate the change in internal energy that occurs when the volume expands from 14 L to 50 L at constant temperature and pressure. This can be done using the ideal gas law, which states that PV=nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the absolute temperature. Since the temperature and pressure are constant, we can write:V1/n1=V2/n2where V1 and n1 are the initial volume and number of moles, and V2 and n2 are the final volume and number of moles. Since the reaction is unspecified, we don't know the number of moles, but we can assume it stays constant. Therefore:V1/V2=n1/n2=1/3.5714This means that the volume increases by a factor of 3.5714. Since work is equal to the negative of the change in internal energy (w=-ΔE), the work done is:W=-ΔE=-(nCvΔT)=-(nR/(γ-1)ΔT)where Cv is the molar heat capacity at constant volume, γ is the ratio of specific heats (Cp/Cv), and ΔT is the change in temperature. Since the temperature is constant, ΔT=0.

Therefore, W=0, and the main answer is A) 0 kJ.However, this is not the final answer, since the question specifies that the reaction takes place against a vacuum. This means that there is no external pressure acting on the system, which means that no pressure-volume work is done. Therefore, the main answer must be modified to take this into account. The work done by the system is equal in magnitude but opposite in sign to the work done by the surroundings. Since there are no surroundings in this case, no work is done by the system. Therefore, the final answer is A) 0 kJ.

To know more about energy visit:

brainly.com/question/13881533

#SPJ11

Answer:

Photons of light from source X carry more energy than photons of light from source Y

Explanation:

According to Einstein's photoelectric equation, the kinetic energy of the emitted photoelectron depends on the energy of the incident photon and the work function of the metal.

For photoelectrons to be ejected from a metal surface, the energy of incident photon must be greater than the work function of the metal. If not, no electron is ejected.

The energy of photon X must be greater than the work function of the metal while the energy of photon Y is less than the work function of the metal. This brings us to the conclusion that the energy of photon X must be greater than that of photon Y.

Answer:

c

Explanation:

i got it right on edg2020

Answer:C

Explanation: Water is light and the picture model shows that it has a light surface for in that case your answer will be C.

The outer core made of liquid rock that produces a magnetic field in the earth. So, C part of given model represents a layer made of liquid rock that produces a magnetic field

So, option A correct one.

The outer core is the third layer of the earth lie above inner core and below mantle and composing fluid liquid nickel and iron and 2200 kilometer thick.

To learn more about iron here.

https://brainly.com/question/24645617

#SPJ3

Answer:

VVV

Explanation:

Covalent bonds are formed when atoms share electrons and ionic bonds are formed when positive and negative ions bond to form an ionic compound.

Answer:

the object should be displaced on which the force is applied

Explanation:

HOPE IT HELPS YOU

Answer:

Converting Between Moles and Liters of a Gas at STP. To convert between moles and the volume of a gas at STP, we will use the factor label method discussed in the first unit. This conversions relies on the fact that a mole of gas at STP has a volume of 22.4 L.

Explanation:

One molecule of carbon dioxide at STP has a volume of 22.4 liters . Thus number of molecules of carbon dioxide in 12.2 L is 3.27 × 10²³ molecules.

A molecule is formed by the combination of same or different kinds of atoms. A number molecules together form a compound. Water, carbon dioxide etc. are compounds.

One mole of a molecule contains 6.022 × 10²³ number of atoms. Similarly, one mole of a compound contains, 6.022 × 10²³ number of molecules.This number is called Avogadro number.

At standard temperature and pressure (STP) that is at 298 K and 1 atm pressure, one mole of any substance carry 22.4 L. Thus number moles of 12.2 L of carbon dioxide is 12.2 / 22.4 = 0.54 moles.

Number of molecules = 0.54 moles × 6.022 × 10²³

                                     =  3.27 × 10²³

Hence, number of molecules of carbon dioxide in 12.2 L is 3.27 × 10²³ molecules.

To find more about Avogadro number, refer the link below:

https://brainly.com/question/11907018

#SPJ2

Answer:

Explanation:

the difference is below:

Answer:

Speed is 2

Explanation:

Speed = distance ÷ time

90/45=2

Answer: 2

Explanation:

Distance/Time = Speed

The solubility of the gas at a pressure of 85 kPa is 0.456 g/L.

The relationship between pressure and a gas's solubility is straightforward. That is, it gets bigger as the strain gets bigger.

The combined gas law can be used to resolve this issue and says that:

(P1V1)/T1 = (P2V2)/T2

To solve for V2, which stands for the new volume at the reduced pressure, we can rearrange this equation as follows:

V2 = (P1V1T2)/(P2T1)

Since the temperature is held constant, T1 = T2, and this simplifies to:

V2 = (P1V1)/P2

Solubility2 = (Solubility1 x P2) / P1

where the solubility at greater pressure is denoted by Solubility1.

With numbers from the problem substituted, we obtain:

Solubility2 = (0.584 g/L x 85 kPa) / 109 kPa

Simplifying this expression, we get:

Solubility2 = 0.456 g/L.

To know more about solubility visit:-

https://brainly.com/question/28170449

#SPJ1

Almost no other form of pan will not warp when left dry on a stove to heat up, and cast iron has unmatched searing power since it has a lot of thermal energy accessible.

To learn more about cast iron refer

https://brainly.com/question/10603863

#SPJ4

A negative nitrogen balance occurs when the rate of protein breakdown in the body exceeds the rate of protein synthesis.

Inadequate protein intake: If a person does not consume enough protein through their diet, the body may not have sufficient amino acids to support protein synthesis. This can lead to muscle breakdown and a negative nitrogen balance.

Caloric deficit: Severe calorie restriction or inadequate energy intake, such as during prolonged fasting or very low-calorie diets, can cause the body to break down muscle protein for energy. This negative energy balance can result in a negative nitrogen balance.

Certain diseases and conditions: Certain medical conditions such as cancer, infections, burns, or chronic inflammatory diseases can increase protein breakdown and impair protein synthesis, leading to a negative nitrogen balance.

Intense physical training or exercise: Strenuous physical activity, especially endurance exercise or resistance training, can increase protein turnover and lead to a negative nitrogen balance if protein intake is not adequate to meet the increased demand for muscle repair and growth.

Injury or trauma: Severe injuries, surgeries, or trauma can stimulate protein breakdown and increase nitrogen losses, potentially resulting in a negative nitrogen balance.

For more such questions on  negative nitrogen visit:

https://brainly.com/question/26589735

#SPJ8

negative nitrogen balance is most likely to occur in conditions such as starvation, severe illness, certain diseases, and periods of rapid growth.

negative nitrogen balance is a condition in which the body excretes more nitrogen than it takes in. This can occur in various situations:

Overall, negative nitrogen balance occurs when the body is breaking down more protein than it is taking in, either due to inadequate nutrition or increased protein breakdown.

About negative nitrogen balance here:

https://brainly.com/question/32750563

#SPJ11

Answer:

true?

Explanation:

Answer:

Gravity always pulls objects such as a desk, book or person down. Thus, when you jump gravity causes you to land on the ground. Friction, however, doesn't pull objects down

Empirical formula units is 2 and the molecular formula is CxHyOz.

Molar mass-The molar mass of a chemical compound is determined by dividing its mass by the quantity of that compound, expressed as the number of moles in the sample, measured in moles. The molar mass of a substance is a bulk attribute rather than a molecular one.Calculate the molar mass of a substance by adding the molar masses of its constituent atoms.

There are 40.0 in 100 g of the unknown.

40.0⋅g/12.011⋅g⋅mol−1C

6.7⋅g/1.00794⋅g⋅mol−1 H and

53.5⋅g/16.00gmol−1  

We divide by to get C : H : O.

=3.33:6.65:3.34

. We get an empirical formula of C H 2 O by dividing each elemental ratio by the LOWEST number, which is close enough to WHOLE numbers.

Now the molecular formula is always a multiple of the empirical formula; i.e.

(EF)n=MF.

So 60.0⋅g.mol−1=n×(12.011+2×1.00794+16.00)g⋅mol−1.

Clearly n=2, and the molecular formula is×(CH2O) =CxHyOz.

LEARN MORE ABOUT Molar mass HERE

https://brainly.com/question/837939

#SPJ4

At any given temperature, a sample of molecules has a thermal energy distribution plot with a bell-shaped curve. The higher the temperature, the more spread out the curve is. Because of this, a small change in temperature results in a large difference in the number of molecules having enough energy to overcome the activation barrier.

Temperature is a measure of the level or degree of heat on an object. Temperature shows the level of the amount of heat energy that is in the object.

Discussion:

The higher the temperature of an object, the hotter it is, and the more heat energy is in that object. The tool for measuring temperature is a thermometer.

For example, hot water has more heat energy than cold ice.

Temperature is one of the basic quantities, which cannot be derived from other quantities. Temperature is measured in Kelvin (in the International System), but in everyday use the most common measurement is degrees Celsius (°C). For example, the temperature of freezing water is 0°C, the temperature of the human body is about 37.5°C and the temperature of boiling water is about 100°C.

The Kelvin scale has many scientific uses, such as calculating temperature and its change in an ideal gas. The kelvin is the SI unit for temperature, where 0 K is absolute zero (at which there is no movement of particles, which is equivalent to -273 °C.

Learn More About Temperature at brainly.com/question/4658134

#SPJ4

Answer:

True

Explanation:

they have the same number of protons but different number of neutrons which results in a different mass

I would greatly appreciate if you can give this the brainliest answer crown!

Answer:

..             ..

O : : C : : O

..             ..

Explanation: