Suppose you have an unknown clear substance immersed in water, and you wish to identify it by finding its index of refraction. You arrange to have a beam of light enter it at an angle of 45. 0º, and you observe the angle of refraction to be 40. 3º. What is the index of refraction of the substance?.

Answer:

Electrons move around a nucleus.

Explanation:

The adequate gain was 0. 6709 g of nitrogen when 2. 879 g of calcium were cooked in pure nitrogen then the empirical formula of the calcium nitride formed exists 11.23 mol/g.

The simplest whole number ratio of atoms present in a substance is its empirical formula in chemistry. A chemical formula that reveals the most basic proportion of the components of a compound rather than the total number of atoms in the molecule.

The empirical formula is the most straightforward formula for a compound and is defined as the ratio of subscripts of the smallest whole number of the formula's constituent elements. It is referred to as the simplest formula as well.

The empirical formula is typically applied to simply display the atoms that make up a molecule. This is helpful if you want to quickly identify the elements you're working with. The molecular formula comes in handy when you want to figure out how many atoms of each element are contained in the complex.

Given: The adequate gain was 0. 6709 g of nitrogen when 2. 879 g of calcium were cooked in pure nitrogen.

\($\frac{0.273 \mathrm{~g}}{1} \times \frac{1 \mathrm{g}}{24.31 \mathrm{~g}} \times \frac{1000 \mathrm{mm}}{1 \mathrm{~mol}}=11.23 \mathrm{m mol g}$\)

To learn more about empirical formula refer to:

https://brainly.com/question/1603500

#SPJ4

Answer:

Consequently, what happens when gas obtained by heating slaked lime and ammonium chloride is passed through copper sulphate solution? The HCl in the gas mixture will form hydrochloric and the H+ will react with some of the NH3(aq), forming NH4^+, and with some of the SO4^2-, forming HSO4^-.

The gas obtained by heating Ammonium Chloride and slaked lime is passed through copper sulphate, deep blue solution will be formed.

The gas obtained by heating Ammonium Chloride and slaked lime is ammonia gas.

2NH₄Cl + Ca(OH)₂  ---> CaCl₂ + 2NH₃ + 2H₂O

Ammonia reacts with copper (II) ions to precipitate light blue copper hydroxide.

Ammonia causes the copper ion to go back into the solution as a deep blue ammonia complex.

However, in excess ammonia, the precipitate dissolves.

Learn more about ammonia gas here: https://brainly.com/question/7982628

#SPJ2

Food scientists work with the chemistry of ingredients in food to improve the quality and stability of the food. They study the use of chemical flavors, thickening agents, stabilizers and preservatives and apply their knowledge to improve existing food products and develop new ones.

GUYS IF YOU GET THE THING ABOUT THE CHILD PERV I WOULD WATCH OUT BUT SOME OF THEM ARE JUST DOING IT TO GET FREE POINTS SO REPORT THEM!! :)

Pls brainliest! :)

Answer:

60 hours

Explanation:

18.0 __15__ 9 __15__ 4.5 __15__ 2.25 __15__ 1.125g

15(4)= 60

Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remain , then it has been passed in 60 hours. So option D is correct.

The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T₁ ÷ 2, and the decay constant is given by T₁/2 = 0.693/λ

According to radioactive decay law, the rate of decay of radioactive atoms at any instant is directly proportional to the number of atoms present at that instant.

dtd N ∝ N

dtd N = λ N

where, N is number of integrated nucleus present in the sample at any time t and λ is decay constant.

Thus ,option D 60 hours is correct.

To learn more about half life follow the link below :

https://brainly.com/question/16387602

#SPJ2

t = 57 min., Therefore, we can say that it takes 57 minutes for cyclopropane's partial pressure to drop from 1 atm to 0.125 atm at 500°C.

Propene (CH3CH=CH2) is produced by the isomerization of cyclopropane, which is a first-order process. A sample of cyclopropane converts to propene in 79 minutes at 760 K.

The reaction is a first-order reaction because it is an isomerization reaction, and its rate constant is expressed in terms of minutes. The sum of the powers or exponents that the concentration terms are raised in the rate law expression can be used to define the order of a reaction.

to know more about isomerization here:

brainly.com/question/2226351

#SPJ4

Answer: It would take 300 light years to reach Earth.

Explanation:

Answer:

silver?

Explanation:

Answer:

Fossil fuels, such as coal, oil, or natural gas, release carbon back into the atmosphere.

The processes would be decomposition, diffusion, erosion, respiration, and combustion.

Explanation:

Hope this helped?

Answer:

The term "phenotype" refers to the observable physical properties of an organism; these include the organism's appearance, development, and behavior

An organism's phenotype describe appearance, development, behavior, maybe even levels of hormones or blood cells.

In order to determine the pH in the given scenarios, several calculations and considerations need to be taken into account.Firstly, the Henderson-Hasselbalch equation can be used, which relates the pH of a solution to the pKa of the acid and the ratio of its conjugate base to the acid. This equation is pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the acid.

The first problem asks for the pH of a solution made by mixing 0.20 mol of acid HA with 0.30 mol of its conjugate base NaA. The pH can be calculated using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]). Given that the pKa is 6, we can plug in the values and solve for the pH.

The second problem asks for the pH after adding 0.05 mol of NaOH to the previous solution. Since NaOH is a strong base, it will react with the acid HA and form water.

The amount of NaOH added is small compared to the amount of acid, so we can assume that the acid will be fully neutralized. We can calculate the resulting concentration of the acid and its conjugate base and use the Henderson-Hasselbalch equation to find the new pH.

The third problem involves mixing 200 mL of 0.20 M HA with 300 mL of 0.30 M NaA. We need to calculate the concentrations of the acid and its conjugate base after mixing, and then use the Henderson-Hasselbalch equation to find the pH.

The fourth problem asks for the pH after adding 10 mL of 0.50 M HCl to the previous solution. Since HCl is a strong acid, it will completely dissociate and increase the concentration of the acid HA.

We need to calculate the new concentrations of the acid and its conjugate base and use the Henderson-Hasselbalch equation to find the new pH.

Learn more about pH of a solution

brainly.com/question/3020720

#SPJ11

95 C/ 203 F

Explanation:

Answer:

A. and C.

Explanation:

The ears job is to keep our body at the right temperature while hearing sounds.

Answer:

oxygen, carbon, hydrogen, nitrogen, and sulfur

Explanation:

Florida's east coast climate causes its winter temperatures to remain higher and its summer temperatures to remain lower than those of other southeastern states. Therefore, option A is correct.

Climate is a region's averaged long-term weather pattern over a period of time, usually 30 years. More precisely, it is the average and variation of climatic variables over a period of time that can range from a few months to many millions of years.

At that height, the jet stream, which is high overhead, affects the wind and pressure. This influences elements closer to the surface, such as zones of high and low pressure, and as a result, influences the weather.

The ground is sinking all along Florida's Atlantic and Gulf coasts. Sea level along the Florida coast is anticipated to increase one to four feet in the following century if the oceans and atmosphere continue to warm. Rising sea levels inundate dry areas and marshes, degrade coastlines, and make coastal flooding worse.

Thus, option A is correct.

To learn more about climate, follow the link;

https://brainly.com/question/10440860

#SPJ2

Manufacturing companies may verify ingredients and check for contaminants to make sure their products are safe to use by testing the raw materials that go into their sanitizers and disinfectants.

a material or item used to lessen or get rid of harmful elements (like germs) on surfaces. As of the beginning of September, sales with alcohol-based hand sanitizers remained roughly 17% higher than they were during the same time last year.

However, broadly speaking, sanitizers with 60 to 95% alcohol are appropriate. The Center fer Prevention and Control suggests formulations using 80% (percent quantity) ethanol and 75% isopropyl alcohol.

To know more about sanitizer visit:

https://brainly.com/question/29545088

#SPJ4

Answer:

Rate cup 1: 36.00 tsp/h.

Rate cup 2: 59.50 tsp/h.

Rate cup 3: 70.13 tsp/h.

Explanation:

Based on the given example, the units must be in tsp/hour. To do this we just have to divide tsp by seconds and then convert it to hours remembering that 1 hour equals 3600 seconds.

Let's calculate each case:

- Cup 1: 1 tsp, 1 minute 40 seconds. Remember that 1 minute equals 60 seconds, so 1 minute and 40 seconds equals 100 seconds. The calculation of the rate will look like this:

The rate of cup 1 is 36.00 tsp/h.

- Cup 2: 2 tsp, 2 minutes 1 second. As we saw before 1 minute equals 60 seconds, so 2 minutes equals 120 seconds. 2 minutes and 1 second equals 121 seconds. The rate of cup 2 will be calculated as:

The rate of cup 2 is 59.50 tsp/h.

- Cup 3: 3 tsp, 2 minutes 34 seconds. 2 minutes are the same that 120 seconds, so 2 minutes 34 seconds equals 154 seconds. The rate of cup 3 is calculated as follows:

The rate of cup 3 is 70.13 tsp/h.

This question is providing the equilibrium constant for the decomposition of PCl5, by the way, to PCl3 and Cl2. Thus, the equilibrium concentrations of all species are required  and found to be 0.0206 M, 0.0294 M and 0.0294 M, respectively, and  after doing the following equilibrium-based calculations:

In chemistry, chemical equilibrium is a condition a chemical reaction reaches when it cannot proceed anymore up to a specific extent of conversion of reactants to products.

In such a way, when having a chemical equation, one can apply the law of mass action, in order to know a constant ratio, or equilibrium expression, at which the reaction stops and maintains constant as the time goes by.

Thus, we can write the equilibrium expression for this reaction as follows:

\(K=\frac{[PCl_3][Cl_2]}{[PCl_5]}\)

Next, we apply the ICE chart to write the aforementioned in terms of the reaction extent, x:

\(0.0420=\frac{x*x}{0.0500M-x}\)

And thus solve for x to get the following results:

\(x_1=-0.0714M\\\\x_2=0.0294M\)

Evidently, the correct answer is x2 because we are talking about concentrations that cannot be negative for any reason. Hence, the concentrations at equilibrium turn out to be:

\([PCl_3]=x=0.0294M\)

\([Cl_2]=x=0.0294M\)

\([PCl_5]=0.0500M-x=0.0206M\)

Learn more about equilibrium expressions: https://brainly.com/question/7069485

Answer:

D) Previous models

Got it right on USTestPrep

Answer:

previous models

Explanation:

I did it

The latent heat of vaporization of boiling water is 540 cal/gm. Option b is the correct answer.

It is the amount of heat needed to convert 1 gram of water from liquid to vapor state at atmospheric pressure at a constant temperature. The latent heat of vaporization for water is relatively high compared to other liquids because of the strong hydrogen bonding between water molecules. This means that water requires a lot of energy to break these bonds and change from a liquid to a gaseous state. The latent heat of vaporization is also responsible for the cooling effect of evaporation. When sweat evaporates from our skin, it absorbs heat from our body, which helps to cool us down. In conclusion, the latent heat of vaporization of boiling water is 540 cal/gm, which represents the amount of heat required to convert 1 gram of water from liquid to vapor state at atmospheric pressure at a constant temperature.

know more about latent heat

https://brainly.com/question/23976436

#SPJ11

Answer:

TTC-GGT-ACT-TGT I could be wrong because A could eather be considered a U or a T, but u could also use UUC-GGU-ACU-UGU

Answer:

Steel and cast iron

Explanation:

They are all metal but assuming that you are finding the best material for your pan i suggest going for steel or cast iron

Answer:

able to evaporate

Explanation:

gas is evaporated liquid...... the process cannot take place again

The partial pressure of helium gas is 162.24 ATM, and it is utilized in the gas mixture Heliox to assist patients with breathing.

A helium and oxygen gas mixture called Heliox is given to people who have trouble breathing. Using it for scuba diving is another usage. The overall pressure requirement is 4.2 atm. Dalton's Law of Partial Pressures states that since heliox is a mixture of only two gases—helium and oxygen—the total pressure in the tank must be equal to the sum of the partial pressures of the two gases. 20% oxygen and 80% helium make up heliox. A breathing gas called heliox is made up of helium (He) and oxygen (O2). It is used as a medicinal treatment for those who have respiratory problems.

Total pressure in Heloix =\(po= 208 atom\)

Mole fraction of oxygen =\(x0=0.22\)

Mole fraction of helium =\(xhc=1- xo=1-0.22=0.78\)

According Dalton's law of partial pressure.

partial pressure of oxygen gas in Heloix:\(p0 * x0=208 atom *0.22=45.76 atom\)

Partial pressure of helium gas in Heloix:

\(phc=po &xhc=208 atom *0.78=162.24 atm\)

Partial pressure of helium gas is 162.24 atm.

to know more about Heliox  please visit.

https://brainly.com/question/28179479

#SPJ4

Taking into account the definition of molarity, the molarity of the solution is 2.17 g/mL.

A solution is a homogeneous mixture where all the particles that exist in it. The chemical present in the greatest quantity is called the solvent, while the other components are called solutes.

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity= mass÷ volume

Molarity is expressed in units mol/L.

In this case, you have:

Replacing in the definition of molarity:

molarity= 0.0326 moles÷ 0.015 L

Solving:

molarity= 2.17 moles/L

Finally, the molarity of the solution is 2.17 g/mL.

Learn more about molarity:

brainly.com/question/9324116

brainly.com/question/10608366

brainly.com/question/7429224

#SPJ1

An existing ecosystem can suffer from damage from invasive species in many different ways, such as shifting habitats and depriving native creatures of food and resources.

An invasive species is an organism that damages the environment or the economy in a new location in which it is not native. Invasive species may disrupt the food chain of a ecosystem by killing or substituting natural food sources. The invasive species could provide little to no food value to wildlife.

Accidental introduction of invasive species into a new area is common. In Central Asia, the Black Sea and the Caspian Sea are home to zebra mussels. Zebra mussels accidently made their way to the Great Lakes of North America after becoming affixed to massive ships that sailed between the two areas.

To know more about Invasive species visit:

https://brainly.com/question/21452505

#SPJ9

the absorbance of the solution in a 1.00cm sample cell at 435 nm is 0.397.

the absorbance of the solution can be calculated using the equation A = εlc,

where l = 1 cm.

We have:

Absorbance of protonated bromothymol blue at 435 nm = ε₁lc

= 13800/Mcm × 2.8 × 10⁻⁵ M × 1 cm

= 0.3876

Absorbance of deprotonated bromothymol blue at 435 nm = ε₂lc

= 3410/Mcm × 5 × 10⁻⁵ M × 1 cm

= 0.1705

Total absorbance of the solution at 435 nm = A₁ + A₂

= 0.3876 + 0.1705

= 0.5581

The total absorbance of the solution is 0.5581.

Therefore, the absorbance of the solution in a 1.00cm sample cell at 435 nm is 0.397.

learn more about absorbance here

https://brainly.com/question/14919298

#SPJ11

Heat is the amount of energy transferred between objects due to temperature differences. It results in a transfer of thermal energy from a warmer object to a cooler object. In this case, when Dave is boiling water on the stove, the pot gets warmer when placed against a hot burner, and steam rises from the pot.

The hot burner transfers heat to the pot through conduction, as the molecules in the burner collide with the molecules in the pot, transferring thermal energy. This leads to an increase in the temperature of the pot.

Simultaneously, the heat from the burner causes the water molecules in the pot to gain energy and increase in temperature. As the water reaches its boiling point, the added heat energy allows the water molecules to overcome intermolecular forces and transform into a gas phase, forming steam. The rising steam is a visible indication of the phase change from liquid to gas.

Therefore, Dave is observing the transfer of heat from the hot burner to the pot through conduction, resulting in an increase in the pot's temperature and the formation of steam as water undergoes a phase change.

To know more about energy transferred click this link -

brainly.com/question/13087586

#SPJ11

: 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.

Learn more about mass concentration  here:- brainly.com/question/23437000

#SPJ11