Question
If you start a chemical reaction with 6 hydrogen atoms, then how many hydrogen atoms would you have after the reaction?

a. 1

b. 3

c. 0

d. 6

Answer:

answer

Explanation:

An object that has a small mass and an object that has a large mass have the same momentum. ... Since the kinetic energy of an object is momentum times of speed. Therefore, for the same momentum, the mass of higher speed will have more energy i.e. the smaller mass.

Metal conductivity generally goes down or resistivity goes up with temperature goes up.

The standard deviation of the sample is 0.579, rounded to the correct number of significant figures.

To calculate the standard deviation of the sample, we need to follow these steps:

To find the mean, we sum up all the data points and divide by the number of data points. Let's calculate it:

(3.09 + 4 + 2.775 + 2.5 + 3.80) / 5 = 16.165 / 5 = 3.233

To do this, we subtract the mean (3.233) from each data point and square the result:

(3.09 - 3.233)^2 = 0.020049

(4 - 3.233)^2 = 0.586489

(2.775 - 3.233)^2 = 0.209025

(2.5 - 3.233)^2 = 0.537289

(3.80 - 3.233)^2 = 0.323329

To find the variance, we sum up the squared differences from step 2 and divide by the number of data points:

(0.020049 + 0.586489 + 0.209025 + 0.537289 + 0.323329) / 5 = 1.676181 / 5 = 0.3352362

√0.3352362 = 0.579 (rounded to three significant figures)

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Answer:

\([H^+]=1x10^{-7}M\)

Explanation:

Hello.

In this case, since the reaction between sodium hydroxide and hydrochloric acid has a 1:1 mole ratio between them:

\(NaOH+HCl\rightarrow NaCl+H_2O\)

In order to compute the hydronium H⁺ concentration in the mixed volumes of the given solutions we first compute the moles of each reactant:

\(n_{NaOH}=0.750L*0.10mol/L=0.075mol\\\\n_{HCl}=0.250L*0.30mol/L=0.075mol\)

As seen, since those amounts are the same, we infer all the acid and base are consumed so the pH is 7 because a neutral salt is produced, and the corresponding H⁺ concentration is:

\([H^+]=10^{-pH}=10^{-7}=1x10^{-7}M\)

Best regards!

Answer:

N atom ( bounded to two Nitrogen atoms ) has a +  formal charge while the N atom bounded to only one (1) Nitrogen atom has a - formal charge .

Explanation:

Diagram Lewis structure of methyl azide ( attached below )

Generally CH3N3 has two(2) resonance structures

What is found in both structures is that the N atom ( bounded to two Nitrogen atoms ) has a +  formal charge while the N atom bounded to only one (1) Nitrogen atom has a - formal charge .

Attached below are the two resonance structures

Methane, also known as \(CH_{4}\), is a substance that has 27% carbon by mass. \(C_{3}H_{8}\) is a different molecule that has 27% mass-based carbon.

Carbon has a molar mass of 12.01 g/mol. Finding compounds with molar masses similar to 27 g/mol will help us figure out which chemical has about 27% carbon by mass, as 27% of 27 g/mol is roughly 7.3 g/mol (because 27% is comparable to 0.27).

The chemical \(CH_{4}\), which has a molar mass of roughly 16 g/mol, is one that fulfils this definition. We can use the following formula to get the percentage of carbon in \(CH_{4}\):

(Mass of Element / Molar Mass of Compound) x 100% Equals % composition

The % content of carbon in methane is as follows:

Mass of carbon divided by the molar mass of methane yields the percentage of carbon.

% of carbon is equal to (12.01 g/mol / 16.04 g/mol) multiplied by 100.

Carbon content as a percentage: 74.97%

As a result, methane does not contain 27% of its mass in carbon.

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Nitrous acid, phosphoric acid, sulfurous acid and carbonic acid are the  weak acids. Hydrochloric acid and perchloric acid is a strong acid. This can be Written in the aqueous solution.

Nitrous acid is a weak acid and can be written in the aqueous solution as,

HNO2 (aq.) ----> H+ (aq.) + NO2- (aq.)

This is very unstable and exists only in aqueous solution.

Hydrochloric acid is a strong acid and can be written in the aqueous solution as,

HCl(aq.) ------> H+ (aq.) + Cl -(aq.)

perchloric acid  is a strong acid and can be written as

HClO4 (aq.) ---->   H+ (aq.) + ClO4- (aq.)

Phosphoric acid is a weak acid. It is a triprotic acid that exists as a dense liquid. It is an irritant or corrosive to the skin, eyes. It can be written in the aqueous solution as,

H3PO4 (aq.) ----> H+ (aq.) + H2PO4- (aq.)

sulfurous acid is a weak acid and can be written as,

H2SO3 (aq.) ----> H+ (aq.) + HSO3- (aq.)

carbonic acid is a weak acid. Carbonic acid is a carbon-containing compound which has the chemical formula H2CO3. This can be written in the aqueous solution as,

H2CO3 (aq.)  ----> H+ (aq.) + HCO3- (aq.)

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The true statements are;

The reaction is endothermic

Heat is a reactant

ΔHrxn is 89 kJ/mol

Enthalpy is a thermodynamic property that represents the total energy of a system, including both its internal energy (the energy of its constituent particles) and the energy it has due to its temperature and pressure. It is commonly used in energy analysis and heat transfer calculations and is expressed in units of joules (J) or calories (cal).

We know that the enthalpy of the reaction can obtained from;

Enthalpy of the products - Enthalpy of the reactants

ΔH reaction = 2(-391.4) - 2(-435.9)

(-782.8) - (-871.8)

= 89 kJ/mol

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Answer:

3.90 Square Inch = 25.16124 Square Centimeter

Explanation:

How to convert Square Inch to Square Centimeter ? 1 square inch (in²) is equal to 6.4516 square centimeter (cm²).

Answer:

its sodium hydroxide

Explanation:

The correct structure that corresponds to the name in the image above is structure A. Details about hydrocarbons can be found below.

Alkanes are organic compound that belongs to any acyclic saturated hydrocarbon e.g. methane, ethane, etc.

Alkanes have a single carbon bond and can be attached to by certain compounds. Methyl is a compound with the formula; CH3.

Therefore, the correct structure that corresponds to the name in the image above is structure A.

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Answer:

C

Explanation:

It was right on acellus

Answer: false

Explanation:

Answer:

Temperature causes water molecules to move more quickly, because each individual molecule has more energy as it gets hotter. If you get water hot enough, the molecules move so much that the hydrogen bonds that hold them together start to break and the water becomes a gas.

Answer:

Protons, neutrons, and electrons are the three main subatomic particles found in an atom.

Explanation:

Answer:Condensation

Explanation:I just took it:/

The phase changes occur when the substances undergoes transition between different states of matter. All phase changes involve either gain or release of energy. Here condensation involves a release of energy. The correct option is B.

The process through which the physical state of matter changes from the gaseous phase into the liquid phase is defined as the condensation. The condensation occurs when water vapor in the air changes into liquid water when it comes in contact with a cooler surface.

During condensation molecules in the gaseous state release energy to change state to a liquid. The opposite of the condensation is the evaporation. At high pressure and low temperature any gas can condense.

Condensation is also important to the water cycle as it is responsible for the formation of clouds and maintains water balance.

Thus the correct option is B.

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Answer:

a. The Zn and HCl both retained their identity.

Answer:

c

Explanation:

Answer:

The types of energy that are involved in a chemical reaction are :

(A) Activation Energy

(B) Chemical Energy.

- The energy required for a chemical reaction to take place is known as the activation energy. - If the energy is less than the activation energy, the reaction will not take place.

Answer:

The answer is

C. Graph A

Answer:

Graph A

Explanation:

:)

The balanced chemical equation for the combustion of propane with oxygen is: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

To balance the equation, first balance the carbon atoms on both sides of the equation. There are three carbon atoms in the propane molecule and three in the carbon dioxide molecule, so balance the carbon atoms by putting a coefficient of 3 in front of the CO₂ molecule.

C3H8 + 5O2 → 3CO₂

Next, balance the hydrogen atoms. There are eight hydrogen atoms in the propane molecule and four in the water molecule, so balance the hydrogen atoms by putting a coefficient of 4 in front of the H₂O molecule.

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Finally, balance the oxygen atoms. There are five oxygen atoms on the left side and 10 on the right side, so balance the oxygen atoms by putting a coefficient of 5 in front of the O₂ molecule.

Therefore, the correct whole number coefficient for propane, C3H8, is 1.

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The volume of carbon dioxide produced is approximately (d) 11.9 liters.

To determine the amount of carbon dioxide (C\(O_2\)) produced when 37.8 grams of carbon disulfide (C\(S_2\)) reacts with excess oxygen gas (\(O_2\)), we need to use stoichiometry and the given balanced chemical equation:

C\(S_2\)(l) + 3\(O_2\)(g) → C\(O_2\)(g) + 2S\(O_2\)(g)

First, we calculate the number of moles of C\(S_2\) using its molar mass:

Molar mass of (C\(S_2\)) = 12.01 g/mol (C) + 32.07 g/mol (S) × 2 = 76.14 g/mol

Number of moles of (C\(S_2\)) = mass / molar mass = 37.8 g / 76.14 g/mol ≈ 0.496 mol

From the balanced equation, we can see that the stoichiometric ratio between (C\(S_2\)) and C\(O_2\) is 1:1. Therefore, the number of moles of C\(O_2\) produced will also be 0.496 mol.

Now we can use the ideal gas law to calculate the volume of C\(O_2\) at the given temperature and pressure. The ideal gas law equation is:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.

Converting the temperature from Celsius to Kelvin:

T(K) = 28.85°C + 273.15 = 302 K

Using the ideal gas law:

V = nRT / P = (0.496 mol) × (0.0821 L·atm/mol·K) × (302 K) / (1.02 atm) ≈ 11.9 L

The correct answer is 11.9 liters.

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The molar concentration of Fe(NO3)3 in the stock solution is 0.0634 M, written in scientific notation as 6.34 x 10-2 M.

To calculate the molar concentration of Fe(NO3)3 in the stock solution , you must first calculate the total moles of Fe(NO3)3 present. This can be done by multiplying the volume of Fe(NO3)3 by its concentration. Therefore, the total moles of Fe(NO3)3 present is 10.0 ml x 0.200 M = 2.00 moles.

Next, the total volume of the stock solution must be found. This can be done by adding the volumes of all components, which in this case is 3.0 ml + 10.0 ml + 17.0 ml = 30.0 ml. Finally, the molar concentration of Fe(NO3)3 can be found by dividing the total moles of Fe(NO3)3 by the total volume of the stock solution: 2.00 moles / 30.0 ml = 0.0634 M.

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Answer:

The porosities in dental materials can be of merit and not merit since some dental materials need to be porous in order to reduce their weight and improve their properties and functions, whereas in those (which are the majority) porosities are not Merit, see the properties of the material, the function and can even influence dental rehabilitation.

An example of this is the use of vitreous ionomers, which is a dental material, where when it is spatulated it remains porous, it can give recurrence of infectious caries, since its permeability increases, the best cariogenic microorganisms are filtered and porosity works as a retentive site for these microorganisms that make up the dental biofilm.

In summary, the world of dental materials is very wide, some are resins, other cements, others have metallic claims, etc. To say that the presence of porosity is merit or demerit would be ideal because for some materials this is favorable and for others unfavorable since they are very versatile, with different qualities, different degrees of porosity, different molecules, different coefficients of thermal expansion, some do not set, others do not, some are light-cured, others do not, some withstand more mechanical forces and have more elastic modulus and less porosity, while others do not, and thus with many more variables.

Explanation:

In the manufacture of dental materials, much attention is always paid to what the manufacturer indicates in these indications that come on the reverse side of the material or on a paper inside the material container.

This is important to know, because the manufacturer is the one that indicates the mode of use and working time according to the trademark and the chemical composition of the dental material.

That a dental material in its manufacture is more or less porous, makes its density, weight and volume possibly be affected, there are materials that seek to increase porosity for a certain purpose, while others seek the opposite, depending on the function that is applied, will have more or less pores.

The example we gave above about the vitreous ionomer is an example that indicates that in the case of restorative dental materials where the function is to SEAL the porosity is almost nil, since otherwise it will not seal the cavity that was formed with caries and not the infectious problem would be solved.

On the other hand, in the surgical field of dentistry there are bone grafts or porous macroparticles that are for the purpose of bone replacement, which in order to be integrated need blood vessels that run over these pores, irrigating the area of ​​bone neoformation well, in this case the merit of porosity if necessary and it is essential that they be very porous.

The vapor pressure of the solution at 30°C is 0.9676781. The pressure that a vapor exerts on its condensed phases (solid or liquid) in a closed system at a specific temperature is known as vapor pressure.

The pressure of the solvent above the solution is known as the vapour pressure of a solution. Temperature, ambient pressure, and solute concentration all have an impact on a solution's vapour pressure. A manometer or a barometer can be used to determine a solution's vapour pressure. When a liquid is contained in a closed container, its molecules frequently crash into the walls of the container. Due to these collisions, the container's walls experience pressure equal to the liquid's vapour pressure.

Solution of P = (0.9677 x 31.8 mmHg)

P solution = 30.8 mmHg

X Solvent = 34.63588 mol/1.156 + 34.635

X Solvent = 0.9676781

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Answer: The answer is Conduction

Answer:

Conduction

Explanation:

Conduction happens when materials or objects are in direct contact with each other. The molecules in the warmer object vibrate faster than the ones in the cooler object.

Option B, where [OH-] is 1.0 x 10-13 mol dm-³3, is the only one that can be considered basic. Therefore, Option B is the correct answer.

To determine whether a solution is basic or acidic at 25 °C, we can compare the concentration of hydroxide ions ([OH-]) with the concentration of hydronium ions ([\(H_3O\)+]). In a neutral solution, the concentrations of [\(H_3O\)+] and [OH-] are equal, resulting in a pH of 7.

Option A states that the concentration of [\(H_3O\)+] is 1.0 x 10-3 mol dm-3. Since [\(H_3O\)+] represents the concentration of hydronium ions, this solution would be acidic because the concentration of [\(H_3O\)+] is higher than [OH-], indicating an excess of hydronium ions.

Option B states that the concentration of [OH-] is 1.0 x 10-13 mol dm-³3. In this case, [OH-] is higher than [\(H_3O\)+], indicating an excess of hydroxide ions. Therefore, this solution would be considered basic.

Option C states that the solution has a pH of 4.00. A pH of 4.00 is below the neutral pH of 7, indicating an excess of hydronium ions and an acidic solution. Therefore, this option does not represent a basic solution.

Option D states that the concentration of [\(H_3O\)+] is 1.0 x 10-13 mol dm-3. Similar to Option A, this concentration of [\(H_3O\)+] indicates an acidic solution, not a basic one.

Option B

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Answer:

D is the correct answer

Explanation:

In order for a solution to be basic at 25 C, the H+ concentration has to be less than the OH- concentration, and given that H+ times OH- is 10^-14, we deduce that H+ must be less than 10^-7 for the solution to be acidic. Thus, A can be eliminated, and so can C. With B, we calculate an H+ concentration of 0.1M, which also fails to be less than 10^-7
Thus, D is the correct answer and we can verify that as H+ is less than 10^-7.



Note: I do not know why my previous answer was deleted for "being incorrect", and i'm not sure how the incorrect answer was "expert verified", but I am as certain that D is the correct answer as i am sure of 3*(4+5-1) being equal to 24.

Answer:

3.85

Explanation:

Calculate molar mass, starting with each element, then find grams per mole, then convert.

Answer:111 meters

Explanation:

if you start at -86 meters and end at 45 an easy way is to take away the negative and add them together resulting in 111 (only works if you start or end negative and end the opposite.)