A system starts with a multiplicity of 2000. two kj of heat are transferred into the system reversibly at 298 k. what is the multiplicity now

When you get into a car that has been sitting in the sun for a while, there are several noticeable things that may occur. Here are some of the common observations:

1. Heat: One of the first things you'll notice is the intense heat inside the car. This is because the sun's rays have been absorbed by the car's exterior and trapped inside, creating a greenhouse effect. The temperature inside the car can become significantly higher than the temperature outside.

2. Hot Surfaces: The surfaces inside the car, such as the seats, dashboard, steering wheel, and metal parts, can become extremely hot to the touch. This is due to the absorption of heat from the sun. It's important to be cautious and avoid direct contact with these hot surfaces to prevent burns or discomfort.

3. Odor: The interior of the car may have a distinct smell when it has been sitting in the sun for a while. This is often referred to as the "hot car smell." It is caused by the combination of materials, such as upholstery, plastic, and carpet, heating up and emitting a specific odor.

4. Fading or Discoloration: Prolonged exposure to sunlight can cause fading or discoloration of materials inside the car. For example, the upholstery, dashboard, and other surfaces may gradually lose their original color and become faded or discolored over time.

5. Glare: When you first enter a car that has been sitting in the sun, you may notice a strong glare from the sunlight reflecting off the windshield and other glass surfaces. This glare can make it difficult to see clearly and may require the use of sunglasses or adjusting the sun visors to minimize the brightness.

It's important to note that these observations may vary depending on factors such as the intensity of the sunlight, the duration the car has been in the sun, and the materials used in the car's interior. Regular maintenance and taking precautions, such as using sunshades or parking in shaded areas, can help minimize some of these effects.

to know more about the greenhouse effect here:

brainly.com/question/31595505

#SPJ11

The balanced chemical equation for the reaction of ascorbic acid (H2C6H6O6) with NaOH is:

H2C6H6O6 + 2 NaOH → Na2C6H6O6 + 2 H2O

From the equation, we can see that 1 mole of ascorbic acid reacts with 2 moles of NaOH.

The number of moles of NaOH used in the titration is:

n(NaOH) = C(NaOH) x V(NaOH)

n(NaOH) = 0.100 mol/L x 0.0220 L

n(NaOH) = 0.00220 mol

Since 2 moles of NaOH react with 1 mole of ascorbic acid, the number of moles of ascorbic acid in the mixture is:

n(H2C6H6O6) = 0.00220 mol / 2 = 0.00110 mol

The mass of ascorbic acid in the mixture is:

m(H2C6H6O6) = n(H2C6H6O6) x M(H2C6H6O6)

m(H2C6H6O6) = 0.00110 mol x 176.13 g/mol

m(H2C6H6O6) = 0.193 g

The percentage of ascorbic acid in the mixture is:

% H2C6H6O6 = (m(H2C6H6O6) / m(mixture)) x 100%

% H2C6H6O6 = (0.193 g / 0.500 g) x 100%

% H2C6H6O6 = 38.6%

Therefore, the mixture contains 38.6% ascorbic acid.

To know more about ascorbic acid, visit the link given below:

https://brainly.com/question/28783204

#SPJ4

Answer:

Evolution is only a theory. It is not a fact or a scientific law. Many people learned in elementary school that a theory falls in the middle of a hierarchy of certainty—above a mere hypothesis but below a law. Scientists do not use the terms that way, however

Answer:

The element argon is in column 8A and is a noble gas. Nobles gases are completely stable because their outershell is filled with all eight electrons.  Argon has eight valence electrons.

The metal sphere was made of a substance with a specific heat capacity of 4,512.48J/kg-K.

Calculate the total heat energy required to raise the temperature of the metal sphere:

Q = mc∆T

Where m is the mass of the metal sphere (0.5 kg), c is the specific heat capacity (unknown), and ∆T is the change in temperature (300 oC - 20 oC = 280 oC).

Q = (0.5 kg)(887 J/kg-K)(280 oC)

Q = 125,160 J

Calculate the total heat energy required to raise the temperature of the mercury:

Q = mc∆T

Where m is the mass of the mercury (4.08 kg), c is the specific heat capacity of mercury (0.14 J/g-K), and ∆T is the change in temperature (99 oC - 20 oC = 79 oC).

Q = (4.08 kg)(0.14 J/g-K)(79 oC)

Q = 4,512.48J/kg-K

For more questions like Sphere click the link below:

https://brainly.com/question/15681471

#SPJ4

Answer: The second one

Explanation: Color works by specific light wavelengths reflecting off surfaces and reaching our eyes. If the red light is absorbed it can't reach our eye cones and we won't be able to see it.

Answer:

Explanation:

This practical can be used to introduce the idea that the relative amounts of a fuel and oxygen (from air) are important in combustion, and that there will be an optimum ratio in which the two substances react. This leads on to the idea of chemical equations.

In the case of a class experiment, where students generate the hydrogen themselves under strict supervision, all the hydrogen generators must be collected once the test tubes have been filled and before any flames are lit, to prevent the possibility of accidental or deliberate ignition of the hydrogen in the generator. This has caused a number of accidents in the past. Alternatively the test tubes could be filled with hydrogen beforehand, or by students under supervision, from a steady cylinder supply.

The internal energy change of hydrogen as it is heated from 200 to 800 K can be calculated using different methods.

One way is to use the empirical specific heat equation as a function of temperature, which is provided in Table A-2c.

This equation gives the specific heat of hydrogen as a function of temperature. By integrating this equation over the temperature range, one can calculate the change in internal energy.

Another method is to use the specific heat values provided in Table A-2b and Table A-2a. Table A-2b provides the specific heat at the average temperature, while Table A-2a provides the specific heat at room temperature.

By multiplying the specific heat values by the mass and the temperature change, one can obtain the internal energy change.

For example, if the specific heat at the average temperature is 2.02 kJ/kg K and the temperature change is 600 K, then the internal energy change can be calculated as 2.02 x 600 = 1212 kJ/kg.

This method is simpler and more straightforward than using the empirical specific heat equation, but it assumes that the specific heat is constant over the temperature range, which may not always be the case.

To know more about specific heat refer here:

https://brainly.com/question/11297584#

#SPJ11

Answer:

the answer would be b

Explanation:

the body sytsem needs to depend on eah other in order to work

Body systems are like runners in a marathon, who each run alone and don't need the other runners to finish the race, is not a good way to describe a body system, hence option B is correct.

Your digestive tract takes nutrients and water from the food you eat in to your body. The body's cells receive oxygen, water, and nutrients through your circulatory system.

Your skin, excretory system, and respiratory system all function to remove wastes from your cells.

Your body's many systems depend on one another to function properly. While your heart's muscles require oxygen from your lungs to beat, your respiratory system depends on your circulatory system to distribute the oxygen it collects.

Therefore, option B is correct.

Learn more about body systems, here:

https://brainly.com/question/13258877

#SPJ2

The mass of the substance is the product of the molar mass and the moles of the substance in the compound. The amount of the HF required in the reaction is 242 gm.

Mass is given as the product of the moles of the substance and of the molar mass of the substance in the compound.

Given,

Molar mass of Silicon dioxide = 60g/mol

mass of Silicon dioxide = 182 g

Molar mass of HF = 20 g/mol

Moles of the Silicon dioxide can be calculated as,

\(\begin{aligned}\rm Moles &= \rm \dfrac{mass}{molar\;mass}\\\\&= {182}{60}\\\\&= 3.03\end{aligned}\)

The balanced chemical reaction can be shown as,

\(\rm SiO_{2} + 4HF \rightarrow SiF_{4} + 2H_{2}O\)

From the reaction, it can deduce that,

1 mole of silicon dioxide reacts with 4 moles of HF

So, 3.03 moles of silicon dioxide reacts with 12.12 moles of HF

Mass of HF can be calculated as,

\(\begin{aligned}\text{mass of HF} &= \rm moles \times \rm molar \; mass\\\\&= 12.12 \times 20\\\\&= 242 \;\rm g\end{aligned}\)

Therefore, the reaction requires 242 gm of HF.

Learn more about mass here:

https://brainly.com/question/11558651

The concentration of H₃O⁺ ions in the aqueous solution is approximately \(1.62 \times 10^{(-2)\) M.To calculate the [H3O+] of the aqueous solution with a pH of 1.79, we need to use the formula \(:pH = -log[H3O+]\)

Rearranging the formula, we get:
\([H3O+] = 10^{(-pH)\)
Plugging in the given pH value, we get:
\([H3O+] = 10^{(-1.79)\\[H3O+] = 1.26 x 10^{(-2) }M\)
Therefore, the [H3O+] of the aqueous solution is \(1.26\times 10^{(-2)\)M.
The terms "solution" and "aqueous" indicate that we're dealing with a liquid mixture, and "pH" measures the acidity or alkalinity of the solution.
The pH formula is:
pH = -log₁₀[H₃O⁺]
Given that the pH of the solution is 1.79, you can solve for the concentration of H₃O⁺ ions ([H₃O⁺]):
1.79 = -log₁₀[H₃O⁺]
To find [H₃O⁺], follow these steps:
1. Rewrite the equation to isolate [H₃O⁺]:
-log₁₀[H₃O⁺] = 1.79
2. Take the inverse log of both sides of the equation:
\([H₃O⁺] = 10^{(-1.79)\)
3. Calculate the concentration:
\([H₃O⁺] =1.62 \times 10^{(-2) }M\)

For more such questions on aqueous solution
https://brainly.com/question/22688504

#SPJ11

The isomer with the higher equilibrium vapor pressure at 20 celsius is the cis-isomer of 1,2-dichloroethene. This is because the cis-isomer has a more symmetrical structure, with the two chlorine atoms on the same side of the double bond, which allows for stronger intermolecular forces of attraction between molecules.

These stronger intermolecular forces lead to a higher boiling point and vapor pressure.
On the other hand, the trans-isomer has a less symmetrical structure, with the two chlorine atoms on opposite sides of the double bond, which leads to weaker intermolecular forces of attraction between molecules. As a result, the trans-isomer has a lower boiling point and vapor pressure than the cis-isomer.
Overall, the molecular structure of each isomer plays a critical role in determining its vapor pressure. The more symmetrical the structure, the stronger the intermolecular forces and the higher the vapor pressure. In this case, the cis-isomer has a more symmetrical structure and thus has a higher equilibrium vapor pressure at 20 celsius.

learn more about atoms

https://brainly.com/question/1566330

#SPJ11

A trial refers to a plan to test an idea. A trial is a test, a plan to test an idea, or one of a series of tests that are designed to determine whether a hypothesis or a theory can be verified or disapproved in the field of science.

Trials are conducted to assess the effectiveness of new medications or to identify the underlying cause of a disease, among other things. A hypothesis is developed in which the scientist predicts the outcome of the trial before it is conducted. The null hypothesis, which assumes that there is no significant difference between the control and test groups, is another hypothesis. After the trial has been conducted, the outcomes are evaluated, and the hypothesis is either confirmed or refuted based on the findings. Trials are critical in determining the effectiveness of new treatments and interventions for human illnesses and ailments. They are the primary technique used to determine if new medicines or therapies are effective, and they can assist in establishing the scientific basis for a specific medicine or therapy.

For more such questions on hypothesis, click on:

https://brainly.com/question/12416923

#SPJ11

Answer:

[Y₂] = 31.25M

Explanation:

Based on the chemical reaction:

2X(g) + Y2(g) ⇌ 2XY(s)

We must define the equilibrium constant, K as:

K = 20 = 1 / [X]²[Y₂]

Where [X] and [Y₂] are the equilibrium concentrations of each gas.

If [X] = 4.0x10⁻²M:

20 = 1 / [4.0x10⁻²M]²[Y₂]

0.032 = 1 / [Y₂]

Answer:

The electrons located between the two nuclei are bonding electrons. A hydrogen molecule forms from two hydrogen atoms, each with one electron in a 1 s orbital. The two hydrogen atoms are attracted to the same pair of electrons in the covalent bond. The bond is represented either as a pair of dots or as a solid line.

Answer:

A.

Explanation:

because im smart

Answer:

Rabbit they eat plants for energy

Explanation:

Answer:

Clover

Explanation:

A clover is the only organism that makes its own food, usually from the sun. The other three need to eat to get their energy. Rabbits eat plants, owls eat insects, and hawks eat other types of animals such as fish.

Answer:  Mass percent N2 = 79.55% (to 3 significant figures).

To calculate the mass percent of N2 in the mixture, first calculate the molar mass of the mixture, which is:

Molar mass = (3.54g * 1 mol/28.0134 g) + (7.48 l * 1.03 atm * 0.08206 l * atm / (305 K * 0.7302 mol/g))

Molar mass = 3.542 g/mol

Then, calculate the mass percent of N2 in the mixture:

Mass percent N2 = (28.0134 g * 1 mol/3.542 g) * 100%

Mass percent N2 = 79.55% (to 3 significant figures).

Learn more about Mass percent here:

https://brainly.com/question/5394922#

#SPJ11

Yes, a precipitate will be observed when the solutions are mixed.

To determine if a precipitate will be observed, we need to calculate the ion product (Q) and compare it to the equilibrium constant (Ksp).
First, let's determine the number of moles of K+ and ClO−4 in each solution:
moles of K+ = 0.80 M x 0.030 L = 0.024
moles of ClO−4 = 0.45 M x 0.050 L = 0.0225
Next, we need to determine the final concentrations of K+ and ClO−4 in the combined solution:
final [K+] = (0.024 mol + 0 mol) / (0.030 L + 0.050 L) = 0.381 M
final [ClO−4] = (0.0225 mol + 0 mol) / (0.030 L + 0.050 L) = 0.225 M
Now, we can calculate the ion product:
Q = [K+][ClO−4] = 0.381 M x 0.225 M = 0.0857
Finally, we can compare Q to the equilibrium constant (Ksp) to determine if a precipitate will form.
If Q < Ksp, no precipitate will form because the solution is not saturated.
If Q = Ksp, the solution is at equilibrium and no net change will occur.
If Q > Ksp, a precipitate will form because the solution is supersaturated.
In this case, Ksp = 0.004, which is less than Q = 0.0857. Therefore, a precipitate will form.

Learn More about precipitate here :-

https://brainly.com/question/30763500

#SPJ11

Answer:

The specific heat of water is greater than that of the metal

Explanation:

When water is put into a hot metal pan of equal mass, we discover that the pan cools down more than the water heats up because heat is rapidly transferred from the pan to the water.

This happens because the specific heat capacity of water is much greater than that of the pan hence heat is more quickly transferred from the pan to the water.

D. NaBH4 is a reducing agent commonly used in organic reactions. It reduces carbonyl groups (such as aldehydes and ketones) to alcohols. None of the other options listed include a reducing agent commonly used in organic reactions.

A. NaNH2 is a strong base that can be used in organic reactions as a nucleophile, but it is not a reducing agent.
B. CrO3 in acid is not a reducing agent, but an oxidizing agent commonly used to oxidize alcohols to carbonyl compounds.

C. H2 with a metal catalyst (such as Pd/C or Pt) is used in hydrogenation reactions to reduce alkenes and alkynes to alkanes, but it is not considered a reducing agent.
E. Na in NH3 (l) is used as a strong reducing agent in inorganic chemistry, but it is not commonly used in organic reactions.

Based on the given list, the reducing agents commonly used in organic reactions are: A. NaNH2 (sodium amide)
C. H2 with a metal catalyst (hydrogen gas and a metal catalyst)
D. NaBH4 (sodium borohydride)
E. Na in NH3 (l) (sodium in liquid ammonia)

To know more about compound click here

brainly.com/question/30037191

#SPJ11

To make a 50.0 mL solution of 1.7 M sodium carbonate (Na₂CO3), we need to determine the mass of Na₂CO3 required.

To calculate the mass of Na₂CO3 needed, we can use the formula:

Mass = Concentration x Volume x Molar Mass

First, we convert the given volume from milliliters to liters:

Volume = 50.0 mL = 50.0/1000 L = 0.05 L

Next, we substitute the given concentration and volume values into the formula:

Mass = 1.7 M x 0.05 L x Molar Mass of Na₂CO3

The molar mass of Na₂CO3 can be calculated by adding the atomic masses of sodium (Na), carbon (C), and three oxygen (O) atoms:

Molar Mass of Na₂CO3 = (2 x Atomic Mass of Na) + Atomic Mass of C + (3 x Atomic Mass of O)

After obtaining the molar mass value, we can substitute it into the formula and perform the calculation to determine the mass of Na₂CO3 required to make the 50.0 mL solution of 1.7 M sodium carbonate.

To know more about sodium carbonate click here:

https://brainly.com/question/24475802

#SPJ11

The reaction performed with the elephant toothpaste demonstration is known as a decomposition reaction.

The process of breaking down a chemical compound into smaller molecules, atoms, or ions is known as a decomposition reaction. It is also known as analysis or disintegration. A reaction in which a single substance is broken down into two or more simpler substances is known as a decomposition reaction. The elephant toothpaste demonstration is a simple chemical reaction in which hydrogen peroxide breaks down into oxygen gas and water in a matter of seconds.

The formula for hydrogen peroxide is H₂O₂. It is a pale blue liquid that contains hydrogen, oxygen, and water. When you add yeast, soap, and food coloring, the reaction is more exciting. The yeast acts as a catalyst, breaking down hydrogen peroxide into water and oxygen gas. The oxygen gas created causes the soap to foam up, creating the "elephant toothpaste" effect. The chemical reaction that takes place during the elephant toothpaste demonstration can be written as follows:

2H₂O₂(liquid) → 2H₂O (liquid) + O₂ (gas)

This reaction is an example of a decomposition reaction.

To know more about decomposition reaction visit:

https://brainly.com/question/32864042

#SPJ11

Answer: True

Explanation:

Mendeleevs periodic classification is based on the atomic masses of the elements.

Answer:

\(82\)

Answer:

\(\boxed {\boxed {\sf 72 \ electrons}}\)

Explanation:

Lead (Pb) has 82 protons, or positively charged particles. If this was a neutral atom of lead, then there would also be 82 electrons, or negatively charge particles to balance each other out and create an overall charge of 0.

However, we are given an ion of lead (Pb⁴⁺) which means the electrons and protons are not equal.

This is a 4+ ion. Since it is more positive, there must be fewer electrons than protons. In this case, it is 4 fewer electrons.

There must be 78 electrons.

Answer:

In order of the colors of the pH test papers from most acidic solutions to most alkaline solutions, the colors of the pH test papers would be

               Red > Orange/Pink > Purple > Blue

(Red) Most acidic                                (Blue)Most alkaline

Explanation:

We can use the different colors of pH test papers to determine the acidity or alkalinity of a solution.

Definitions

A pH test paper is a strip of indicator paper which changes colour when placed in acidic or alkaline solutions.

A solution is said to be acidic if it turns the colour of the pH test paper RED

A solution is said to be alkaline/basic if it turns the colour of the pH test paper BLUE

Color changes

If the pH test paper turns red, then the solution is a very strongly acidic solution with pH less than 3 ( ie pH between 1-3)

If the pH test paper turns orange or pink, then the solution is a weak acidic solution with pH greater than 3 ut less than 7

If the pH test paper turns purple, then the solution is a weak alkaline solution with pH greater between 8-11

If the pH test paper turns blue, then the solution is a very strong alkaline solution with pH between 11 - 14

Summary

Therefore, in order of color changes from the most acidic solutions to most alkaline solutions, the colors of the pH test papers would be

Red > Orange/Pink > Purple > Blue

Most acidic                                Most alkaline

Answer:

d<c<a<b

Explanation:

The number of moles of NaF that will be produced from 3moles of Na is 3 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, sodium reacts with fluorine as follows:

2Na+ F₂ → 2NaF

Based on the above equation, 2 moles of Na will produce 2 moles of NaF

This means that 3 moles of Na will produce 3 moles of NaF.

Learn more about stoichiometry at: https://brainly.com/question/9743981

#SPJ1

Answer:

carbon

Explanation: carbon is the answer