The speed limit on a certain highway is 72 km/h. what is the speed in cm/s?

Answer:

Its neither a myth nor deadly

Explanation:

Bizarre hexagonal clouds forming above the Bermuda Triangle may be the reason why dozens of ships and planes have mysteriously vanished in the notorious patch of sea, according to scientists.

According to the new theory, clouds over the Bermuda Triangle are like “air bombs” strong enough to cause ship and plane wrecks. The strange “hexagonal” shaped clouds were discovered using radar satellite imagery, which were between 20 and 50 miles wide forming over the water.

The wavelength of an electromagnetic wave that has a frequency of 1.82 x 10¹⁸ Hz in a vacuum is 1.65 × 10-¹⁰m.

The wavelength of a wave can be calculated by dividing the speed of the wave by its frequency.

According to this question, a wave has a frequency of 1.82 x 10¹⁸ Hz in a vacuum and speed of light in a vacuum is 3.00 × 10⁸ m/s.

wavelength = 3 × 10⁸ ÷ 1.82 × 10¹⁸

wavelength = 1.65 × 10-¹⁰m

Therefore, the wavelength of an electromagnetic wave that has a frequency of 1.82 x 10¹⁸ Hz in a vacuum is 1.65 × 10-¹⁰m.

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Benzo[a]pyrene (BaP) is a polycyclic aromatic hydrocarbon found in coal tar with the formula [tex]C_{20}H_{12}[/tex].

Grilling involves cooking food on a rack over a heat source, usually a charcoal fire or ceramic briquettes heated by gas flames.

A chemical that comes from certain substances when they are not burned completely.

Benzo[a]pyrene (BaP) is a polycyclic aromatic hydrocarbon found in coal tar with the formula [tex]C_{20}H_{12}[/tex].

The compound is one of the benzopyrenes, formed by a benzene ring fused to pyrene, and is the result of incomplete combustion at temperatures between 300 °C (572 °F) and 600 °C (1,112 °F).

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Answer:

Explanation:

''A conjugate acid is formed when a proton is added to a base, and a conjugate base is formed when a proton is removed from an acid.''

In a conjugate acid-base pair, only difference between molecules is the amount of ''H''

One molecule must have 1 more H

in the last example HNO2 and H2O, difference is not only the H amount also H2O doesn't have N. So we can't say they are conjugate acid-base pair.

Answer:

Alkyne are hydrocarbons which contain carbon-carbon triple bonds.

During the riding of the steep mountain, the body needs more energy because going up consume more energy and oxygen due to additional effect of gravity on your momentum.

Cycling is a good exercise as swimming, while cycling, happy hormones are released like dopamine and serotonin.

The primary forces that work while cycling are gravity, friction, rolling resistance, and air resistance.

Thus, During the riding of the steep mountain, the bod needs more energy because going up consume more energy and oxygen due to additional effect of gravity on your momentum.

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Functional groups are the specific groups that provide characteristic properties. The compounds are butanoic acid and methyl propanoate.

Functional groups are the active side atoms and molecules that confer the physical and chemical properties of the compound. In the first compound, the functional group is the carboxylic acid (COOH) and four carbon atoms hence, the compound is butanoic acid.

In the second compound, the functional group is an ester (RCOOR) and contains a methyl group and other three carbon atoms making the compound, methyl propanoate.

Therefore, the compounds are butanoic acid and methyl propanoate.

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In general, solids become more soluble as the temperature increases. This is why sugar dissolves better in hot water than in cold water. The table shows three examples of the solubility (g of solute per 100 g water) of substances at different temperatures.

The solution to the problem rounded to the correct number of significant figures is 32.841. Details about multiplication can be found below.

Multiplication is the process of computing the sum of a number with itself a specified number of times.

According to this question, a mathematical value of 8.01 is multiplied by 4.1.

8.01 × 4.1 = 32.841 (5 s.f)

Therefore, the solution to the problem rounded to the correct number of significant figures is 32.841.

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Answer:

female reproductive structures

Answer:

5.12 moles of hydrochloric acid.

Explanation:

The balanced equation is:

2KMnO4 + 16HCl  --->  2KCL + 2MnCl2 + 5Cl2 + 8H2O

So 2 moles of potassium permanganate  reacts with 16 moles of HCl.

So 0.64 moles KMnO4 react with  (16/2) * 0.64

= 5.12 moles.

Answer:

Approximately [tex]0.639\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex].

Explanation:

Look up the specific heat of water:

[tex]c(\text{water}) = 4.18\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex].

It is given that the mass of the water in this calorimeter is:

[tex]m(\text{water}) = 130.0\; {\rm g}[/tex],

The temperature of the water in this calorimeter has increased by:

[tex]\Delta T(\text{water}) = (31.0 - 25.5)\; {\rm K} = 5.5\; {\rm K}[/tex].

Thus, the energy that the water in this calorimeter absorbed would be:

[tex]\begin{aligned}& Q(\text{water})\\ =\; & c(\text{water}) \, m(\text{water}) \, \Delta T(\text{water}) \end{aligned}[/tex].

Let [tex]c(\text{metal})[/tex] denote the specific heat capacity of this piece of metal.

The mass of this piece of metal is:

[tex]m(\text{metal})[/tex].

The temperature of this piece of metal has been reduced by:

[tex]\Delta T(\text{metal}) = (96.0 - 25.5)\; {\rm K} = 70.5\; {\rm K}[/tex].

As this piece of metal cooled down, the energy it released would be:

[tex]\begin{aligned}& Q(\text{metal})\\ =\; & c(\text{metal}) \, m(\text{metal}) \, \Delta T(\text{metal})\end{aligned}[/tex].

Assuming that there is no exchange of energy between contents of this calorimeter and surroundings. By the law of conservation of energy, energy could neither be created nor destroyed.

Since energy could not be destroyed, the water in this calorimeter need to absorb the entirety of the energy that this piece of metal released. At the same, since no energy isn't created, the energy that the water absorbed would need to entirely come from this piece of metal. Therefore:

[tex]Q(\text{metal}) = Q(\text{water})[/tex].

[tex]\begin{aligned}& c(\text{water})\, m(\text{water})\, \Delta T(\text{water}) \\&= c(\text{metal})\, m(\text{metal})\, \Delta T(\text{metal}) \end{aligned}[/tex].

Rearrange and solve this equation for [tex]c(\text{metal})[/tex]:

[tex]\begin{aligned}& c(\text{metal}) \\=\; & \frac{c(\text{water}) \, m(\text{water})\, \Delta T(\text{water})}{m(\text{metal})\, \Delta T(\text{metal})} \\ =\; & \frac{4.18\; {\rm J \cdot g^{-1} \cdot K^{-1}} \times 130.0\; {\rm g} \times (31.0 - 25.5)\; {\rm K}}{72.0\; {\rm g} \times (96.0 - 25.5)\; {\rm K}} \\ \approx\; & 0.639\; {\rm J \cdot g^{-1}\cdot K^{-1}}\end{aligned}[/tex].

Answer:

collectively they're known as HYDROCARBONS

The empirical formula of the compound containing 15.66% A and 84.34% Z as given from the question is AZ₂

Divide by their molar mass

A = 15.66 / 15.45 = 1.014

Z = 84.34 / 41.62 = 2.026

Divide by the smallest

A = 1.014 / 1.014 = 1

Z = 2.026 / 1.014 = 2

Thus, the empirical formula of the compound is AZ₂

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The functional group found in methanol is as follows: R single bond OH (R-OH). Details about methanol can be found below.

A functional group is a specific grouping of elements that is specific to a class of compounds, and determines the chemical properties of that class.

Each hydrocarbon or organic compound have a specific functional group characteristics of its group.

Alcohol (OH) is the functional group of certain organic compounds like methanol, ethanol etc. Therefore, the functional group found in methanol is as follows: R single bond OH (R-OH).

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Answer:

R single bond O single bond R.

Single bond N H Subscript 2

Single bond O H.

R single bond X.

Explanation:

Answer:-102

Explanation:The equation shows that 1 mole of H-H bonds and 1 mole of Br/Br vines are broken from 2 miles of H-Br bonds

Answer: -102

Explanation:

law of conservation of matter

hope it helps...!!!

Answer:

Chemical Change

Explanation:

A chemical change is when something is turned into a new substances.

In this example the wood is being turned into ash.

Answer:

NaNO3 is the answer of given statement

Answer:

Synthesis Reaction

Explanation:

An synthesis reaction is one in which two or more atoms/molecules react to create a different molecule. These reactions follow the general structure: A + B --> AB.

More specifically, this is an addition reaction. An addition reaction occurs when two or more atoms/molecules combine to create a larger molecule. In this case, carbon and fluorine react to form carbon tetrafluoride, a larger molecule consisting of all the reactants.

This is not a decomposition reaction because these reactions involve a molecule breaking down into atoms or simpler molecules. These reactions follow the general structure: AB --> A + B.

This is not a single-replacement reaction because these reactions involve atoms replacing atoms of a different element in a compound. These reactions follow the general structure: A + BX --> B + AX.

Answer:

Explanation:

Explanation

Look at the equation that describes what is going on.

4Fe(s)+3O2(g)⟶2Fe2O3

Air is about 20% oxygen. The flame of steel wool is a gentle one since the oxygen is in limited supply.

Steel wool is about 99 % Iron. The rection above tells you that when steel wool ignites, it becomes Fe+3

Answer: The rule is the more oxygen you have, the more violent the burning process.

Answer:

in a solution of salt in water, the solute is salt, and solvent is water.

Explanation:

C) salt is the solute, water is the solvent.

Answer:

C

Explanation:

:)

Answer:

It takes 7 mol H2 to produce 7 mol H2O

Explanation:

In 2H2O, there's 2 moles of H2 for every 1 mol O2.

So, if oxygen is limiting you'd only be able to produce 2 moles of H2O. I don't know if the question implies that, so it could also be that 7 mol H2 makes 7 mol H2O. Sorry for the confusion, I hope it helps a bit

The best reason for using iron filings (shreds) instead of an iron nail in a chemical reaction is to increase the surface area of the reaction.

Rate chemical reaction is the speed at the which chemical compounds react which each other. Some factors can speed up the rate of chemical reaction and they include;

A large surface area provides enough medium for chemical reaction to occur and hence speeds up the rate of chemical reaction.

Thus, the best reason for using iron filings (shreds) instead of an iron nail in a chemical reaction is to increase the surface area of the reaction.

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Answer:

D. 44.2 g O₂

General Formulas and Concepts:
Gas Laws

Stoichiometry

Explanation:

Step 1: Define

Identify given.

61.9 L O₂ at STP

Step 2: Convert

We know that the oxygen gas is at STP. Therefore, we can set up and solve for how many moles of O₂ is present:

[tex]\displaystyle 61.9 \ \text{L} \ \text{O}_2 \bigg( \frac{1 \ \text{mol} \ \text{O}_2}{22.4 \ \text{L} \ \text{O}_2} \bigg) = 2.76339 \ \text{mol} \ \text{O}_2[/tex]

Recall the Periodic Table (Refer to attachments). Oxygen's atomic mass is roughly 16.00 grams per mole (g/mol). We can use a mole ratio to convert from moles to grams:

[tex]\displaystyle 2.76339 \ \text{mol} \ \text{O}_2 \bigg( \frac{16.00 \ \text{g} \ \text{O}_2}{1 \ \text{mol} \ \text{O}_2} \bigg) = 44.2143 \ \text{g} \ \text{O}_2[/tex]

Now we deal with sig figs. From the original problem, we are given 3 significant figures. Round your answer to the exact same number of sig figs:

[tex]\displaystyle 44.2143 \ \text{g} \ \text{O} \approx \boxed{ 44.2 \ \text{g} \ \text{O}_2 }[/tex]

∴ our answer is letter choice D.

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Topic: AP Chemistry

Unit: Stoichiometry

Answer:

helium=1,2atm

argon=2,8atm

Explanation:

partial is pressure exerted by each gas in a system since 30% is helium it means 70% is argon

argon =70%x4

helium=30%4

Dalton's law of partial pressure is applicable to only ideal gas not to the vanderwaal gases. The partial pressure of helium and argon is 1.2atm and  2.8atm respectively.

According to Dalton's law of partial pressure, the total pressure of a mixture of gases is equal to the total sum of partial pressure of individual exerting on the walls of the container.

Mathematically,

Partial pressure=total pressure× mole fraction

Total pressure= 4.00 atm

percentage of helium = 30%=0.3

percentage of argon=100-30%=70%=0.7

Substituting the given values in above equation

Partial pressure of helium=4.00 atm× 0.3

Partial pressure of helium=1.2atm

Partial pressure of argon = 4.00 atm× 0.7

Partial pressure of argon = 2.8atm

Therefore, the partial pressure of helium and argon is 1.2atm and  2.8atm respectively.

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