The solubility of a gas in water is 0.66 g/L at 15 kPa of pressure. What is the solubility when the pressure is increased to 40.0 kPa?

Answer: D:wavelenght

Explanation: Students will understand that shorter wavelengths have higher frequency and energy.

Answer:

C I believe... I might be wrong though

Explanation:

Answer:

The orest one is possible D

Explanation:

Answer:

Like signs.

Explanation:

When two charges are like signs, a repelling force will occur.

1st part is ure answer --> 2M

Given mass -> 58 grams

mass of NaCl -> 58.44 approx -> 58 any

moles given-> 1 moles

\(Molarity = \frac{moles}{vol \: in \: lts} \)

\(Molarity = \frac{1}{0.5} = \frac{10}{5} \\Molarity = 2M\)

The mean of the data is 4.

The formula of the mean is

Sum of all the observation÷ Total number of observations

So, According to the formula :

Sum of all the observations= 4+1+3+9+6+3+2+4 = 32

The number of observations is 8

So,

32÷8

= 4

Hence, the mean of the data is 4.

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A standard EpiPen contains approximately 0.3 milligrams of epinephrine, which is equivalent to 0.3 milliliters of a 1:1000 solution, or 3 micrograms of epinephrine per dose. there are approximately 9.83 x 10^20 molecules of epinephrine in a standard EpiPen.

Epinephrine, also known as adrenaline, is a hormone and neurotransmitter that is produced naturally by the body in response to stress or danger. It acts on the sympathetic nervous system to increase heart rate, constrict blood vessels, dilate airways, and mobilize energy stores in the body. It is also used as a medication to treat severe allergic reactions, such as anaphylaxis.

A standard EpiPen is a self-administered device that contains a single dose of epinephrine in a prefilled syringe. The EpiPen delivers the medication through a spring-loaded mechanism that injects the solution into the thigh muscle. The dose is typically 0.3 milligrams (or 0.3 milliliters) of a 1:1000 solution of epinephrine, which means that there is 1 milligram of epinephrine in 1000 milliliters of solution.

To calculate the number of molecules of epinephrine in a standard EpiPen, we need to know the molecular weight of epinephrine and Avogadro's number, which is the number of molecules in one mole of a substance. The molecular weight of epinephrine is approximately 183 grams per mole, which means that one mole of epinephrine contains Avogadro's number (6.02 x 10^23) molecules.

Since the dose of epinephrine in a standard EpiPen is 0.3 milligrams, we can convert this to micrograms by multiplying by 1000, which gives us 300 micrograms. To calculate the number of molecules of epinephrine in 300 micrograms, we need to use the formula:

Number of molecules = (mass in micrograms/molecular weight) x Avogadro's number

Plugging in the values for epinephrine, we get:

Number of molecules = (300/183) x 6.02 x 10^23

Simplifying this expression gives us:

Number of molecules = 9.83 x 10^20

Therefore, there are approximately 9.83 x 10^20 molecules of epinephrine in a standard EpiPen.

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Answer:

Explanation:

Explain why the name 1-propene is incorrect what is the proper name for this molecule

The name 1-propene is incorrect because;

The proper name for this molecule is;

Propene otherwise known as propylene is simply propane with a double bond at the first carbon.

When we get to the alkenes where the naming of organic compounds becomes more complex, the numbering system is used to indicate the position of the bonds.

With propene, there are three carbon atoms and the double bond will always appear in between two of the carbon atoms.

So, it is not important to use numbers to show that the carbon is at the first carbon. This becomes necessary from the next compound, butene, where there are more carbons.

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The balanced half-reactions are given below:

A. Mo³⁺ (aq) + 3e⁻ → Mo(s)

B. H₂SO₃ (aq) +  H₂O → SO₄⁻ (aq) + 4 H⁺ + e⁻

C. NO₃⁻ (aq) + 4 H⁺ + 2e⁻ → NO (g) + 2 H₂O

D. O₂ (g) + 4H⁺ +  4 e⁻ → 2 H₂O (l)

Half-reactions refers to either of the two reactions in a redox reaction.

A redox reaction is a reaction in which oxidation and reduction occur simultaneously and to the same extent.

Oxidation reaction involves a loss of electrons while reduction reaction involves a gain of electrons.

The balanced half-reactions are given below:

A. Mo³⁺ (aq) → Mo(s) ( in acidic solution)

This is a reduction reaction:

Mo³⁺ (aq) + 3e⁻ → Mo(s)

B. H₂SO₃ (aq) → SO₄⁻ (aq) (acidic solution)

This is an oxidation reaction

H₂SO₃ (aq) +  H₂O → SO₄⁻ (aq) + 4 H⁺ + e⁻

C. NO₃⁻ (aq) → NO (g) (acidic solution)

This is a reduction reaction

NO₃⁻ (aq) + 4 H⁺ + 2e⁻ → NO (g) + 2 H₂O

D. O₂ (g) → H₂O (l) (acidic solution

This is a reduction reaction

O₂ (g) + 4H⁺ +  4 e⁻ → 2 H₂O (l)

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The ferric chloride test for phenols indicates that both the crude and recrystallized samples of aspirin are pure.

The ferric chloride test is a qualitative test that helps to identify the presence of phenols in a given sample. When ferric chloride is added to a phenolic compound, it forms a colored complex. In this experiment, both the crude and recrystallized samples of aspirin produced a negative result for the ferric chloride test, indicating the absence of phenols. This suggests that both samples are pure and do not contain any impurities that could interfere with the test.

It is important to note that the ferric chloride test is not a definitive test for the presence of phenols, as other compounds may also produce a positive result. However, a negative result is a good indication of the absence of phenols.

In addition, the purity of the samples can also be confirmed through other tests such as melting point determination and TLC analysis. Overall, the absence of phenols in the crude and recrystallized samples of aspirin suggests that the purification process was successful in removing impurities.

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Answer:

There is only 1 sig figures in 6

Explanation:

There is no 0 after it so it is considered as only 1 significant figure

When diluting an acid, it is recommended to add the acid to water and not the other way around (adding water to acid). This is because the process of mixing an acid with water can release a significant amount of heat, and adding water to concentrated acid can lead to vigorous and potentially dangerous reactions.

Here are a few reasons why it is safer to add acid to water:

Heat Dissipation: The dilution of strong acids is an exothermic process, which means it releases heat. By adding the acid slowly to water while stirring, the heat generated can be dissipated more effectively. On the other hand, if water is added to concentrated acid, there is a risk of localized heating and potential splattering due to rapid boiling or splashing of the hot acid.

Spattering and Splashing: When water is added to concentrated acid, there is a higher likelihood of spattering and splashing of the acid, which can cause burns or injuries. Adding acid to water allows for better control and minimizes the chances of violent reactions or sudden release of energy.

Dilution Gradually: By adding acid to water, you can gradually increase the volume and concentration, ensuring better mixing and distribution of the acid in the water. This helps prevent localized high concentrations of acid that could lead to rapid reactions.

Acidic Fumes and Aerosols: Concentrated acids often release fumes and aerosols that can be hazardous to inhale. By adding acid to water, any released fumes or aerosols are more likely to be contained within the larger volume of the solution, reducing the risk of exposure.

It's important to follow proper safety protocols, wear appropriate protective equipment (such as gloves and goggles), work in a well-ventilated area, and consult specific guidelines or procedures provided by chemical manufacturers or regulatory agencies when handling and diluting acids.

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A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.

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h^ ar hidrojen oksijen azot helyum

Answer:

69%

Explanation:

Percent yield = ?

Theoretical yield = 985 grams

Experimental Yield = 680 grams

Percent Yield = Experimental Yield / Theoretical Yield * 100

Percent Yield = 680 / 985  * 1 00

Percent Yield = 0.690 * 100 = 69%

From the list provided, the following groups are part of the periodic table are Metals, Nonmetals , Semimetals and Conductors .

Metals: Metals are a group of elements that are typically solid, shiny, malleable, and good conductors of heat and electricity. They are located on the left-hand side and middle of the periodic table.

Nonmetals: Nonmetals are elements that have properties opposite to those of metals. They are generally poor conductors of heat and electricity and can be found on the right-hand side of the periodic table.

Semimetals: Semimetals, also known as metalloids, are elements that have properties intermediate between metals and nonmetals. They exhibit characteristics of both groups and are located along the "staircase" line on the periodic table.

Conductors: Conductors are materials that allow the flow of electricity or heat. In the context of the periodic table, certain metals and metalloids are good conductors of electricity.

Therefore, the groups that are part of the periodic table are metals, nonmetals, semimetals, and conductors. The other groups mentioned, such as acids, flammable gases, and ores, are not specific groups found on the periodic table but may be related to certain elements or compounds present in the table.

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The complete question is :

From the list below, choose which groups are part of the periodic table.

metals

acids

flammable gases

nonmetals

semimetals

ores

conductors

I think its nitrogen, im not sure tho

Intermolecular force is the force acting between two different molecules. There are various kinds of intermolecular forces and the they differ in their strength.

Intermolecular forces are force of attraction or repulsion acting between two different molecules in a compound. The like charges of molecules repels and unlike charges will attracts together.

There are different kinds of intermolecular forces such as hydrogen bonding, Van der Waal's forces, dipole, dipole forces, London dispersion forces etc.

The strength of these forces vary from each other. The intermolecular force of attraction holds tow molecules together in a compound. Hence, option D is correct.

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Answer:

grgrrgrgrgrg

Explanation:

Answer:

2 hydrogen

2 sulphate

8 oxygen

The number of days it take for a 0.240-mol sample of radium to decay to 6.00×10−2mol is approximately 1.38 × 10^12 days.

The half-life of radium is 1,620 years.

We will use the equation that relates the initial number of moles, the final number of moles, and the decay constant. We'll start by finding the decay constant (k).The decay constant (k) can be determined using the following formula:

1/2 = e^(-kt), where t is the half-life in seconds.

The half-life of radium in seconds can be determined by multiplying 1620 years by 365.25 days per year and then multiplying by 24 hours per day and then 3600 seconds per hour.

1/2 = e^(-k(1620 years * 365.25 days/year * 24 hours/day * 3600 seconds/hour)) = e^(-k)(5.02 × 10^14 s)

ln(1/2) = -5.02 × 10^14 k

ln(2) = 5.02 × 10^14 k

K = (ln(2))/(5.02 × 10^14 s)K = 1.38 × 10^−17 s^−1

Now, let's find out how long it would take to decay from 0.240 mol to 6.00 × 10^-2 mol.0.240 = (6.00 × 10^-2) e^-kt

ln(4) = -kt

ln(4)/-k = t = 1.19 × 10^16 seconds

Therefore, the number of days it would take is:

1.19 × 10^16 seconds * (1 minute/60 seconds) * (1 hour/60 minutes) * (1 day/24 hours) = 1.38 × 10^12 days

So, it would take approximately 1.38 × 10^12 days for a 0.240-mol sample of radium to decay to 6.00 × 10^-2 mol.

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Answer:

Fats........................

Lipids is the class of macromolecule was described as being most like the hydrocarbons.

Macromolecules are bigger molecules of large size and made of smaller molecules called as monomers, Polymers are macromolecules.

All Macromolecules are not like the hydrocarbon because the macromolecules not only consists of  C and H atoms but also N and O.

Macromolecules are classified into 4 types

Proteins , Carbohydrates , Lipids and Nucleic Acids

Lipids is the class of macromolecule was described as being most like the hydrocarbons.

Lipids are a broad category of chemicals that are mostly nonpolar in nature.

This is due to the fact that they are hydrocarbons with nonpolar carbon–carbon or carbon–hydrogen bonds.

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Answer:

Don't throw paints, oils or other forms of litter down the drain. Use environmentally household products, such as washing powder, household cleaning agents and toiletries. Take great care not to overuse pesticides and fertilisers. This will prevent runoffs of the material into nearby water sources.

Answer:

is this physics

pls check your questions and try again

The energy of light, with a wavelength of 2.04 x 10-4 nm, emitted by a uranium atom as it undergoes alpha decay is 9.70 x 10^-13 J.

The energy of light, with a wavelength of 2.04 x 10-4 nm, emitted by a uranium atom as it undergoes alpha decay can be calculated using the formula:

E = hc/λ

Where: E = Energy of light = Planck's constant (6.626 x 10^-34 J.s)c = Speed of light (3 x 10^8 m/s)λ = Wavelength of light in meters. Firstly, we need to convert the wavelength of light from nanometers (nm) to meters (m).1 nm = 1 x 10^-9 mSo, the wavelength of light is λ = 2.04 x 10^-4 nm = 2.04 x 10^-13 m. Substitute the values of h, c, and λ in the formula: E = hc/λE = (6.626 x 10^-34 J.s)(3 x 10^8 m/s)/(2.04 x 10^-13 m)E = 9.70 x 10^-13 J

Thus, the energy of light emitted the uranium atom as it undergoes alpha decay is 9.70 x 10^-13 J.ConclusionThe energy of light, with a wavelength 2.04 x 10-4 nm, emitted by a uranium atom as it undergoes alpha decay is 9.70 x 10^-13 J. This energy can be calculated using the formula E = hc/λ, where h is Planck's constant, c is the speed of light, and λ is the wavelength of light in meters. We first convert the wavelength from nanometers to meters and then substitute the values in the formula to obtain the energy of light.

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Answer:

Chronic traumatic encephalopathy (CTE) is a progressive brain condition that's thought to be caused by repeated blows to the head and repeated episodes of concussion. It's particularly associated with contact sports, such as boxing or American football.

Explanation:

Answer:

0.845mol NaCl

Explanation:

NaCl has a molar mass of 58.44g/mol.

49.3g/58.44g/mol = 0.845mol

Answer:

0.844

Explanation:

if you divide 49.3 by 58.44 it gives you 0.84360027 which you then round up to 0.844. I know my answer is correct cause I just took the test

Answer:

position, speed and acceleration

When the change in free energy for a reaction, (AG°) is positive, the correct statement for the equilibrium constant Keg is:Keq <1.Therefore, the correct option among the given alternatives is d) Keq <1.

What is the equilibrium constant Keg Equilibrium constant is a numerical value that shows how much a chemical reaction favors reactants or products at equilibrium. It is a ratio of product concentrations to reactant concentrations at equilibrium and can be calculated by applying concentration or pressure of each component in the balanced equation.

For a reaction at standard conditions, the equilibrium constant is called K°. If the value of ΔG° of a reaction is positive, then the reaction is not spontaneous, and the value of Keg is less than 1. Therefore, the option Keq <1 is correct for the given question.

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Answer:

Combination reaction.

Explanation:

The reaction depicted in the question is;

H2 (g) + Cl2 (g) ⟶ 2HCl (l)

Now, this reaction shows that two reactants namely hydrogen and chlorine react to form a single product named Hydrogen chloride. This process is called combination reaction.