How do you calculate wavelength and frequency?​

Answer:

18.5 years

Explanation:

(6 x 10^23)/(10^15 x 1.03 x 3600 x 24 x 365)

Hope this helps!

The heat of combustion for the unknown hydrocarbon when1 mole of an unknown hydrocarbon is burned in a bomb calorimeter and the Calorimeter increases in temperature by 12.19°C is -611.26kJ/mol

A device that is mostly used to measure combustion temperatures. The reaction occurs in a sealed area known as the calorimeter proper, in constant thermal contact with its surroundings (the jacket).

To calculate the heat of combustion we follow the given steps:

Heat released by the combustion =Cp×ΔT=1.929×12.19 kJ=23.51 kJ

Hence, ΔH=−23.51 kJ/g

A unknown hydrocarbon has an empirical formula of CH and a molar mass of 26 g/mol.

So,  ΔH combustion=−23.51×26g /mol=−611.26kJ/mol

Hence, ΔH combustion=−15.6×180 kJ/mol=−611.26kJ/mol

ΔH combustion=−611.26kJ/mol

Hence, the heat of combustion for the unknown hydrocarbon when1 mole of an unknown hydrocarbon is burned in a bomb calorimeter and the Calorimeter increases in temperature by 12.19°C is -611.26kJ/mol

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Answer:

No change

Explanation:

Since rubber are elastic in nature, there's no change in it's state even if it is hammered. So, it will be in it's initial state as it was before.

Answer:

the option is option(J)

Newton's third law

Explanation:

The given question is incomplete. The complete question is:

Calculate the number of moles and the mass of the solute in each of the following solution: 100.0 mL of 3.8 × 10−5 M NaCN, the minimum lethal concentration of sodium cyanide in blood serum

Answer: The number of moles and the mass of the solute are \(0.38\times 10^{-5}\) and \(18.62\times 10^{-5}g\) respectively

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

\(Molarity=\frac{n\times 1000}{V_s}\)

where,

n = moles of solute

\(V_s\) = volume of solution in ml

\(3.8\times 10^{-5}M=\frac{n\times 1000}{100.0}\)

\(n=0.38\times 10^{-5}\)

n = moles of \(NaCN\) = \(\frac{\text {given mass}}{\text {Molar mass}}\)

\(0.38\times 10^{-5}=\frac{x}{49g/mol}\)

\(x=18.62\times 10^{-5}g\)

Thus the number of moles and the mass of the solute are \(0.38\times 10^{-5}\) and \(18.62\times 10^{-5}g\) respectively

Answer:

Ethane & propane are members of same homologous series : alkane which is indicated with Cn H2n+2

Explanation:

Answer:

a

Explanation:

organs are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system. The small intestine has three parts.

Answer:

normal

Explanation:

Answer:

You have about 6158 Molecules of 02.

Explanation:

Answer:

The answer should be krypton Im doing the test rn.

Explanation:

The most reactive element in period 4 which is shiny and forms a +1 cation is potassium.

The periodic table is defined as an arrangement of elements in groups and periods. The elements in the same group have similar properties while the elements in the same period has the same number of shells.

The element in period 4 that is shiny, forms a cation of +1 charge and is the most reactive in period 4 is the element potassium.

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Answer:

500100 benswuer kers olá Marilene

The mass of H₂O is 44,680 g for the given reaction 2H₂ + O₂ → 2H₂O. Therefore, the correct option is option A.

In physics, mass is a quantitative measurement of inertia, a basic characteristic of all matter. It essentially refers to a body of matter's resistance to changing its speed or location in response to the force that is applied. The change caused by either an applied force is smaller the more mass a body has.

The kilogramme, which is defined approximately equal to 6.6 × 10⁻³⁴ joule second in terms of Planck's constant, is the unit of mass inside the Worldwide System of Units (SI). A joule is equivalent to one kilogramme multiplied by one square metre per second. The mass of H₂O is 44,680 g for the given reaction 2H₂ + O₂ → 2H₂O.

Therefore, the correct option is option A.

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Answer:

colloidal system liquid dispersed in gas.

Answer:

chemical energy to  kinetic energy

Explanation:

Answer:

A. Chemical energy to kinetic energy and gravitational potential

energy

Explanation:

There are 0.261 moles of ammonium chloride present in the resulting solution.

To find the number of moles of ammonium chloride in the solution, we need to use the formula:

moles = mass / molar mass

First, let's find the molar mass of ammonium chloride (NH4Cl):
Nitrogen (N) has a molar mass of 14.01 g/mol
Hydrogen (H) has a molar mass of 1.01 g/mol (there are 4 hydrogen atoms in ammonium)
Chlorine (Cl) has a molar mass of 35.45 g/mol

Now, let's calculate the molar mass of ammonium chloride:
Molar mass of ammonium chloride = (14.01 g/mol) + (4 * 1.01 g/mol) + (35.45 g/mol)
= 53.49 g/mol

Next, we'll use the formula to calculate the number of moles of ammonium chloride:
moles = 14.0 g / 53.49 g/mol
= 0.261 moles

Therefore, there are 0.261 moles of ammonium chloride present in the resulting solution.

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Answer:

In this reaction, the hydrogen from the HCl is taken up by ammonia.

NH₃ (aq) + HCl (aq)  ----> NH₄⁺ (aq)  + Cl⁻ (aq)

In this reaction, ammonium (NH₄⁺) is the acid and the chorine ion (Cl⁻) is the base.

When acid and base combine then formation of salt take place and the reaction is called neutralization reaction. Hence the balanced equation is NH₃(aq) + HCl(aq)  \(\rightarrow\)NH₄Cl

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The principle behind the balanced equation is the conservation of mass that is mass can neither be created nor be destroyed.

Since, HCl is acid and NH₃ is base so H⁺ will be transferred from acid to base

The balanced equation is

NH₃(aq) + HCl(aq)  \(\rightarrow\) NH₄⁺(aq)  + Cl⁻ (aq)

Cl⁻ and NH₄⁺  combine to form salt ammonium chloride

Here NH₃  is Lewis base as it can donate its lone pare of electron to H⁺ coming from acid and HCl is a Bronsted acid as it give H⁺.

Hence the balanced equation is

NH₃(aq) + HCl(aq)  \(\rightarrow\)NH₄Cl

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The correct answer is cerium 141,911amu.

A unit atomic mass is defined as one-twelfth of the mass of a single carbon-12 atom. The atomic mass of an element is the atomic mass. Average atomic mass is the weighted average of the atomic masses of all isotopes of that element.

To answer this question, a formula is written to calculate the average atomic mass of cerium. (135.90714 amu × 0.0019 )+ ( 137.90599 amu × 0.0025 )+ ( 139.90543 amu * 0.8843 )+(Ce−142 × 0.1113)

= 140.116

Solving the equation for Ce-142 gives an atomic weight of 141.911 amu.

The correct answer is 141,911 amu. 

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Atomic mass of the element = 4.003 g/mol.

The number of atoms in a sample can be calculated using the following formula:

Number of moles = Mass of sample / Molar massAvogadro's number .

Number of atoms = Number of moles × Avogadro's number

Let's solve the problem by substituting the given values in the above formulas:

Given,Mass of the sample = 4.65 g

Atomic mass of the element = 4.003 g/molMolar mass of the element = Atomic mass in g/mol = 4.003 g/molNumber of moles = Mass of sample / Molar mass= 4.65 g / 4.003 g/mol= 1.162 molAvogadro's number = 6.022 × 10²³Number of atoms = Number of moles × Avogadro's number= 1.162 mol × 6.022 × 10²³= 6.99 × 10²³ atoms

Hence, there are 6.99 × 10²³ atoms present in a 4.65 g sample of the element.

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The time required to decrease the initial concentration to 0.050 mol/L is 9.62 seconds.

To determine the time required for the second-order reaction to decrease the initial concentration to 0.050 mol/L, we can use the integrated rate law for a second-order reaction:

1/[A]t - 1/[A]0 = kt

Where [A]t is the final concentration, [A]0 is the initial concentration, k is the rate constant, and t is the time. Rearranging the equation, we have:

t = (1/kt) * (1/[A]t - 1/[A]0)

Plugging in the values, [A]t = 0.050 mol/L, [A]0 = 0.100 mol/L, and k = 2.6 × 10–2 L/mol·s, we can calculate the time required to be approximately 9.62 seconds.

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1. Apple juice has a pH of around 3 and lemon juice has a pH near 2. to neutralize with baking soda lemon juice would need more baking soda because it is more acidic than aple juice. the less  ph present the more baking soda need to neutralize.

2. A "mole" is the quantity of a material that is precisely 6.02214076 X 1023 particles in the International System of Units. Ions, atoms, or molecules might make up the particles.

The number of moles of a solute in a litre of solution is known as molarity (M). The symbol for molarity is M, which stands for mole/liter.

Molarity is a measure of a solution's concentration that is expressed in units of moles per litre. Therefore, molarity is utilised to calculate the solute's volume.

3 Hexane will  dissolve in  ionic salt like LiCl because both of the compound are covalent and non-polar and like dissolves like.

4.Every enzyme has a preferred pH range. Outside of this range, pH changes will limit enzyme activity. Enzymes can denature at extreme pH levels. If there is a substrate available for the enzyme to bind to, increasing the concentration of the enzyme will hasten the process.

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The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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A penny, which is made of copper can scratch calcite, gypsum and talc.

Mohs scale is used to represent the degree of hardness. Common objects such as fingernail, copper penny and glass plate was used to perform the test. Using these testing tools, the hardness of an unknown mineral was determined by comparing with the nearest number on  Mohs scale.

The scale consists of 10 different minerals. A material which has a hardness higher than the other can scratch anything with hardness of equal number or lower number.

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Answer:

If you were to mix 10 grams of sugar into 200 grams of water, how much will the total mass of the solution be=

If you consider the density of water = 1 (otherwise you can’t solve the problem) you have a total mass of 30 g of which 10 g are sugar and 20 g are water. Therefore the calculation is easy:

% (w/w) of sugar = 10x100/30 = 33.33…%

% (w/w) of water = 20x100/30 = 66.66…%

Polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore the total mass of solution is 210grams.

Solubility shows the extent of solubility of a solute in solvent to make a solution. Solute is substances that is present in small amount. solvent is a substance that is present in large amount. Its SI unit is gram per litre or g/L.

Bond strength affect the solubility of a solute in solvent. weaker the bond strength is, more the solubility is. The weaker bond can be easily broken by water molecule.

mass of solution = mass of solute+ mass of solvent

mass of solute or sugar= 10 grams

mass of solvent or water=200 grams

Substituting the given values we get

mass of solution =10 grams+ 200 grams

mass of solution =210grams

Therefore the mass of solution is 210grams.

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In order to answer this question, we first need to balance the chemical equation that describes the formation of PF3 from F2.

The balanced chemical equation is:F2 + 3H2 → 2HF + PF3This equation tells us that 1 mole of F2 reacts with 3 moles of H2 to produce 2 moles of HF and 1 mole of PF3.Using stoichiometry, we can then determine the number of moles of F2 needed to form 2.8 moles of PF3. We know that the ratio of F2 to PF3 is 1:1, so we can set up a proportion:1 mole F2/1

mole PF3 = x moles F2/2.8 moles PF3Cross-multiplying and solving for x, we get:  x = 2.8 moles F2/1 mole PF3 x 1 mole F2/1 mole PF3x = 2.8 moles F2Therefore, we need 2.8 moles of F2 to form 2.8 moles of PF3.Hence, the required number of moles of F2 needed to form 2.8 moles of PF3 is 2.8 moles of F2. The answer is justified with 160 words.

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: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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Answer: There are 1.51 moles present in \(9.12 \times 10^{23}\) atoms.

Explanation:

According to the mole concept, there are \(6.022 \times 10^{23}\) atoms present in one mole of every substance.

Hence, moles present in \(9.12 \times 10^{23}\) atoms are calculated as follows.

\(Moles = \frac{9.12 \times 10^{23}}{6.022 \times 10^{23}}\\= 1.51 mol\)

Thus, we can conclude that there are 1.51 moles present in \(9.12 \times 10^{23}\) atoms.

The maximum amount of caffeine that can be extracted from one bag of Lipton black tea using liquid-liquid extraction procedure can be calculated using the given values of caffeine content in tea bags, volume of tea-water used, and the Kd for caffeine in methylene chloride.

First, we need to calculate the amount of caffeine extracted during the initial solid-liquid extraction. Since it is assumed that full extraction occurs during the initial step, the entire 60 mg of caffeine in one tea bag would be extracted into the 40 mL of tea-water. This means that we have 60 mg of caffeine in 40 mL of tea-water, which is equivalent to 1.5 mg/mL.

Assuming that we use 40 mL of methylene chloride for the liquid-liquid extraction, we can calculate the amount of caffeine that would be extracted into the methylene chloride layer.

Using the formula Kd = [caffeine]_organic / [caffeine]_aqueous

Substituting the values, we get 7.2 = [caffeine]_organic / 1.5, which gives us [caffeine]_organic = 10.8 mg/mL. This means that for every mL of methylene chloride, 10.8 mg of caffeine can be extracted.

Therefore, using 40 mL of methylene chloride, the maximum amount of caffeine that can be extracted is 40 mL x 10.8 mg/mL = 432 mg of caffeine.

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Answer:

The shapes and lines they hold within the rock. Rocks can simply be regenerated and melted back into a new and different form. Lines and texture usually prove how old the rocks are.

Explanation:

I hope this helps and I'm sorry if it's wrong! <3