Which one of the following molecules can form hydrogen bonding?

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:

the answer is D because they should be asking a question instead of wondering how long the ad is hope this helped.

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

Subatomic particle is the smallest particle than the atom

Explanation :-

An atom consist of three subatomic particle

They are electron , proton and neutron .

Proton ( p ) it is a subatomic particle with positive chargewhich is equal to electron charge and a mass of

[tex]1.67262 \times {10}^{ - 27} kg [/tex]

Electron ( e ) It is the subatomic particle with negative charge and a mass equal to

[tex]9.109 × {10}^{ - 31}kg [/tex]

Neutrons ( n ) - It is neutral subatomic particle which is the constituent of every atomic nucleus except hydrogen . Neutrons have no electric charge and a rest mass equal to

[tex]1.67493 \times {10}^{ - 27} kg[/tex]

slightly greater than that of electron

Explanation:

INTRODUCTION:

There are 3 main subatomic particles, they are:

The existence of the sub-atomic particles was proved by the fact that an atom is electrically neutral but it can be made to gain a positive or a negative charge. This means that an atom must contain tiny particles, each carrying either a positive or a negative charge.

These opposing charges balance each other under ordinary conditions to make an atom electrically neutral.

ELECTRONS:

Electrons were discovered in 1897 by J.J. THOMSON when he was studying cathode rays.An electron is denoted by:

[tex] \boxed{ _ {- 1 }e {}^{0} }[/tex]

Where,

Properties of electrons:

UNIT CHARGE OF Electrons:

NEUTRONS:

In 1932, James chadwick discovered neutrons & it had no charge. Its denoted as [tex] _{0} n ^1[/tex]

PROPERTIES OF NEUTRONS:

An atom of hydrogen contains only 1 proton and one electron but no neutron.

UNIT CHARGE OF IT:

PROTONS:

An atom is electrically neutral Therefor the presence of the negatively charger electrons in an atom suggests that it must contain positively charged particles a well, otherwise an atom would not b electrically neutral.It is discovered by E. GOLDSTEIN.

It's denoted as [tex] _{+1} p ^1[/tex]

where 1 represents 1 a.m.u. and +1 represents 1 unit positive charge.

PROPERTIES:

>>>All elements contains electrons & protons.

Since an atom is electrically neutral, the number of electrons in an atom is equal to the mumber of protons in that atom. However, no two elements contain the same number of protons in their respective nuclei.

UNIT Charge:

[All units I provided are a.m.u. .]

[tex] \rule{225pt}{2pt}[/tex]

Hope this helps :)

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.

Answer:

Alkyne are hydrocarbons which contain carbon-carbon triple bonds.

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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Answer:

No digestion occurs in the esophagus. After passage through the esophagus, the bolus will enter the stomach and undergo mechanical and chemical digestion. Mechanical digestion in the stomach occurs via peristaltic contractions of the smooth muscle from the fundus towards the contracted pylorus, termed propulsion.

Explanation:

i hope it's help

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.

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

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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Answer:

NaNO3 is the answer of given statement

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:

B

Explanation:

The four factors that increase the rate of the reaction:

1.Concentration of the reactants

2.Size of the particles

3.Temperature

4.Catalyst

From the stoichiometry of the combustion reaction, we can see that 7.4 L of oxygen is consumed.

Combustion is a reaction in which a substance is burnt in oxygen. The equation of the reaction is; C4H10O(l) + 6O2 (g) → 4CO2 (g) + 5H2O(l)

We can obtain the number of moles of CO2 from;

PV = nRT

n = 1.02 atm * 7.15 L/0.082 atm LK-1mol-1 * (125 + 273) K

n = 7.29 /32.6

n = 0.22 moles

If 6 moles of oxygen produces 4 moles of CO2

x moles of oxygen produces 0.22 moles of CO2

x = 0.33  moles

1 mole of oxygen occupies 22.4 L

0.33 moles of oxygen occupies 0.33 moles *  22.4 L/ 1 mole

= 7.4 L of oxygen

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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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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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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:

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.

law of conservation of matter

hope it helps...!!!

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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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.

When the magnet is put inside two coils of wire, the voltage will increase by a factor of two.

An induced emf occurs when a magnet is placed in magnetic field and their is relative motion of a conductor placed in the magnetic field.

The strength of the induced emf increases with increase in the number of the turns of the conductor and its relative speed in the field.

emf = NdФ/dt

where;

The above formula is the basis of Faraday's law of electromagnetic induction.

Thus, when the magnet is put inside two coils of wire, the voltage will increase by a factor of two.

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Answer:

female reproductive structures

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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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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Answer:

collectively they're known as HYDROCARBONS