18. How is the kinetic energy of molecules changing when the molecules move faster?
The kinetic energy ...
a
is not changing
b
depends on the molecules.
С
is decreasing.'
d
is increasing
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The pH of 0.001 M LiOH is 11.

What is pH?

pH is negative logarithm of concentration of H⁺ ions. pH is a scale that has a range of 0 to 14. 0 to 6 range represents acidic solution whereas 8 to 14 range represents basic solution. 7 value of pH represents neutral solution.

pH is very useful for our daily life. There must be a balanced pH for the water we drink or in our blood or in our surrounding air or soil etc.

It can be represented as-

pH = -log[H⁺]

pH = 14 - pOH

Given,

Concentration of LiOH = [OH] = 0.001 M

pOH = -log[0.001] = 3

Hence, pH = 14 - 3 = 11

Therefore, the pH of 0.001 M LiOH is 11.

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Answer:

a. 0.0413 moles Zn

b. 0.0500 moles HCl

c. HCl is the limiting reactant

d. 0.0250 moles H₂

e. V = 0.56L

Explanation:

The reaction of Zn(s) with HCl is:

Zn(s) + 2HCl (aq) → ZnCl₂ (aq) + H₂(g)

Where 1 mole of Zn reacts with 2 moles of HCl.

a) To convert mass in grams to moles of a substance you need to use molar mass (Molar mass Zn: 65.38g/mol), thus:

2.70g Zn × (1mol / 65.38g) = 0.0413moles of Zn

b. Now, when you have a solution in molarity (Moles / L), you can know the moles of a volume of solution, thus:

Moles HCl:

50.0mL = 0.0500L × (1.00mol / L) = 0.0500 moles HCl

c. The limiting reactant is founded by using the chemical reaction as follows:

For a complete reaction of 0.0500 moles HCl you need:

0.0500 moles HCl × (1 mole Zn / 2 moles HCl) = 0.0250 moles Zn

As you have 0.0413 moles of Zn, and you need just 0.0250 moles for the complete reaction, Zn is the exces reactant and HCl is the limiting reactant

d.As HCl is limiting reactant and 2 moles of HCl react with 1 mole of H₂, moles of hydrogen formed are:

0.0500 moles HCl × (1 mole H₂ / 2 moles HCl) = 0.0250 moles H₂

e. Using PV = nRT, you can find volume of  gas, thus:

PV = nRT

V = nRT / P

Where P is pressure 1atm at STP, n are moles, R is gas consant 0.08206Latm/molK and T is absolute temperature 273.15K at STP.

V = 0.0250molesₓ0.082atmL/molKₓ273.15K / 1atm

V = 0.56L

Answer:

Metalloid

Explanation:

A metalloid is a type of chemical element which has a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals. There is neither a standard definition of a metalloid nor complete agreement on the elements appropriately classified as such

Answer:

BeF2

Explanation:

The correct chemical formula for the product of the reaction when beryllium and fluorine combine is BF₂.

The valence electron of an atom determines how an atom goes into bonding.

Beryllium(Be) has 4 electron and has 2 valence electron. To fulfil the octet rule, it can easily give out this 2 electron during bonding.

Fluorine(F) has 9 electrons and 7 valency electrons. To fulfil the octet rule, it readily accepts a single electron.

The correct chemical formula for the product of the reaction when beryllium and fluorine combine is BF₂.

This means 1 atom of beryllium combines with 2 atoms of fluorine to form beryllium fluoride. The beryllium give its 2 valency electrons to the 2 atoms of fluorine. The 2 atoms of fluorine will now have a valency electron of 8 each. The octet rule has been fulfilled at this point.

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80 molecules of \(NH_{3}\) will be formed if 60 molecules of \(N_{2}H_{4}\) decomposes into \(N_{2}\) and \(NH_{3}\)

The smallest particle of a substance has all of the physical and chemical properties of that substance. Molecules are made up of one or more atoms.

Just balance the reaction:

\(3N_{2}H_{4}\to N_{2}+4NH_{3}\)

Now you can see that every 3 molecules of \(N_{2}H_{4}\)4 molecules of \(NH_{3}\).

For 60molecules of \(N_{2}H_{4}\) we scale up these numbers by a factor of 60/3 = 20.

Therefore 4x20 = 80 molecules of  \(NH_{3}\) are formed.

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Answer:

D. +2

Explanation:

To find charge use the formula:

Protons - Electrons = Charge

Answer:

D

Explanation:

it just is bro its general knowledge if you know what i mean,

im drinking sucky with the mafia

i got half a mill in monopoly money

SHEeSsh

the methyl cation has an sp3 hybridization state, a trigonal pyramidal molecular geometry, and a bond angle of approximately 109.5 degrees. These concepts are essential for understanding the properties and behavior of molecules in chemistry.

Hybridization state, molecular geometry, and bond angles are fundamental concepts in chemistry that help us understand the behavior and properties of molecules. In this answer, we will discuss these concepts and apply them to the methyl cation, CH3+.

The hybridization state of an atom refers to the mixing of atomic orbitals to form new hybrid orbitals that are suitable for bonding. The most common types of hybridization are sp, sp2, sp3, and sp3d, which correspond to one, two, three, and four hybrid orbitals, respectively. In the case of the methyl cation, the central carbon atom is bonded to three hydrogen atoms, and the total number of electron groups is four. Therefore, the hybridization state of the carbon atom is sp3.

The molecular geometry of a molecule describes the spatial arrangement of its atoms. The molecular geometry is determined by the number of electron groups around the central atom and the nature of the bonding electrons. The VSEPR theory (Valence Shell Electron Pair Repulsion theory) is commonly used to predict the molecular geometry of a molecule. According to VSEPR theory, the electron groups around the central atom repel each other, and the molecule will adopt a shape that minimizes this repulsion.

In the case of the methyl cation, the central carbon atom has four electron groups, including three single bonds with hydrogen atoms and one lone pair. The lone pair of electrons exerts a greater repulsive force than the bonding pairs, leading to a distorted tetrahedral molecular geometry. The methyl cation has a trigonal pyramidal shape, with the three hydrogen atoms positioned at the corners of a triangle and the lone pair occupying the apex.

The bond angle is the angle formed between two adjacent bonds. The bond angle is also influenced by the repulsive forces between the electron groups around the central atom. In the case of the methyl cation, the bond angle between the three hydrogen atoms is approximately 109.5 degrees, which is slightly less than the ideal tetrahedral angle of 109.58 degrees. The bond angle is slightly reduced because the lone pair of electrons exerts a greater repulsive force than the bonding pairs.

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Answer:

B .805 mL

Explanation:

Here, temperature is constant!

so we can use P1V1=P2V2

P1,V1 is pressure and volume in original condition

and P2V2, pressure and volume in new condition!

now, volume is given 900mL(=V1)

standard pressure is 1 atm i.e, 760mmHg(=P1)

pressure increases to 850mmHg(=P2)

now we have,

P1V1=P2V2

i.e, 760mmHg×900mL=850mmHg×V2

i.e, V2={(900×760)/850 } mL

=804.75 mL

≈805mL

The pH of a 2.0 M solution of \(HC_{2} H_{3} O_{2}\) with 5% dissociation is approximately 2.87.

What is dissociation?

The dissociation equation for acetic acid (\(HC_{2}H_{3}O_{2}\)) is:

\(HC_{2}H_{3}O_{2}\)  + \(H_{2}O\) ⇌ \(H_{3}O^{+}\)+ \(C_{2} H_{3}O_{2}^{-}\)

The dissociation constant for this reaction is denoted by Ka and is equal to 1.8 x \(10^{-5}\) at 25°C. The percent dissociation of 5% can be written as:

% dissociation = (concentration of ionized acid / initial concentration of acid) x 100

5% = (x / 2.0) x 100

x = 0.1 M

So, the concentration of ionized acid is 0.1 M and the concentration of unionized acid is 2.0 M - 0.1 M = 1.9 M.

What is pH?

The equilibrium expression for this reaction is:

Ka = [\(H_{3}O^{+}\)][\(C_{2}H_{3}O_{2}^{-}\)] / [\(HC_{2}H_{3}O_{2}\)]

Assuming that the initial concentration of \(H_{3}O^{+}\) is equal to the concentration of ionized acid (0.1 M), and that the concentration of \(HC_{2}H_{3}O_{2}\) that is dissociated is negligible compared to the initial concentration (this is a reasonable assumption since the percent dissociation is only 5%), we can write:

Ka = (0.1)² / (1.9)

Rearranging this equation and taking the negative logarithm of both sides, we get:

pH = pKa + log([\(C_{2}H_{3}O_{2}^{-}\)] / [\(HC_{2}H_{3}O_{2}\)])

pH = -log(1.8 x \(10^{-5}\)) + log(0.1 / 1.9)

pH = 2.87

Therefore, the pH of a 2.0 M solution of \(HC_{2}H_{3}O_{2}\) with 5% dissociation is approximately 2.87.

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Answer:

different

Explanation:

A chemical reaction may be defined as the process or method by which a substance undergo a change in their structure chemically when reacting with some other substance and acquiring the property of both or sometimes forms a new substance. It leads to the chemical transformation of the chemical substance to some another substance.

The properties of the new substance formed is different form the parent substance before the reaction.

Thus, when chemical reaction occurs, the properties of the substances before the reaction and after the reaction takes place is different.

Answer:

monkey

Explanation:

cause that's what u r

Answer:

Percent yield = 88.23%

Explanation:

Given data:

Percent yield of ammonia = ?

Actual yield = 15 g

Mass of nitrogen = 14 g

Solution:

Chemical equation:

N₂ + 3H₂      →     2NH₃

Number of moles of nitrogen:

Number of moles = mass/molar mass

Number of moles = 14 g/ 28 g/mol

Number of moles = 0.5 mol

Now we will compare the moles of ammonia and nitrogen.

         N₂          :         NH₃

          1            :         2

         0.5        :        2/1×0.5 = 1 mol

Mass of ammonia/Theoretical yield

Mass = number of moles × molar mass

Mass = 1 mol × 17 g/mol

Mass = 17 g

Percent yield:

Percent yield = ( actual yield / theoretical yield )× 100

Percent yield =  (15 g/ 17 g)× 100

Percent yield = 88.23%

The concentration of the final solution is 0.157 M.

To calculate the concentrations of the second and final solutions, we can use the formula:

C1V1 = C2V2

where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

For the first dilution, we have:

C1 = 1.40 M

V1 = 59.0 mL

V2 = 238 mL

Solving for C2, we get:

C2 = (C1V1) / V2

  = (1.40 M × 59.0 mL) / 238 mL

  = 0.346 M

So the concentration of the second solution is 0.346 M.

For the second dilution, we have:

C1 = 0.346 M

V1 = 119 mL

V2 = 119 mL + 143 mL = 262 mL

Solving for C2, we get:

C2 = (C1V1) / V2

  = (0.346 M × 119 mL) / 262 mL

  = 0.157 M

So the concentration of the final solution is 0.157 M.

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On adding 5 liters of yellow tint in a mixture of 30 liters of paint with 25% red tint, 30% yellow tint and 45% water;  the new mixture will contain 35.71% yellow tint.


The original mixture contains 30% yellow tint, which is equivalent to 0.3 x 30 = 9 liters of yellow tint. Since 5 liters of yellow tint are added to the original mixture, the total amount of yellow tint in the new mixture is 9 + 5 = 14 liters.

To find the percentage of yellow tint in the new mixture, we need to divide the amount of yellow tint by the total volume of the new mixture. The total volume of the new mixture is 30 + 5 = 35 liters. Therefore, the percent of yellow tint in the new mixture is: (14 / 35) x 100% = 40/7% ≈ 35.71%. Thus, the new mixture contains 35.71% yellow tint.

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Answer:

96mg

Explanation:

Since the half-life of Palladium-100 is 4 days and the sample has been reduced after 16 days, that means the sample has undergone four half-lives. To find the intial mass, just work backwards:

As you see, I've worked backwards from the four half-lives. So the initial mass after 16 days is 96 mg.

Answer:

The correct answers are:

(a) Arrhenius acid

(c) Bronsted-Lowry acid

(e) Lewis acid

(g) Polyprotic acid

Explanation:

To determine whether "HNO" dissolved in water fits any of the given categories, let's analyze it:

"HNO" is not a valid chemical formula because it lacks charges for the elements. However, if we assume it refers to nitric acid (HNO₃), we can assess its behavior when dissolved in water.

Nitric acid (HNO₃) is a strong acid and dissociates completely in water to produce hydronium ions (H₃O⁺) and nitrate ions (NO₃⁻):

HNO₃(aq) → H₃O⁺(aq) + NO₃⁻(aq)

Based on this information, we can determine the correct answers:

The remaining options are not correct for HNO₃ dissolved in water:

Therefore, the correct answers are:

(a) Arrhenius acid

(c) Bronsted-Lowry acid

(e) Lewis acid

(g) Polyprotic acid

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Answer:

All three vehicles have the same kinetic energy because they have equal speed.

Answer:

That would be hydrogen and helium! :)

The percentage composition of aluminium sulfide can be calculated by determining the relative mass of each element in the compound and expressing it as a percentage of the total mass.

Aluminium sulfide has the chemical formula Al2S3, which means it contains 2 atoms of aluminium and 3 atoms of sulfur.

To calculate the percentage composition of aluminium sulfide, we need to first determine the atomic mass of each element. The atomic mass of aluminum is 26.98 g/mol, and the atomic mass of sulfur is 32.06 g/mol.

The total molar mass of aluminium sulfide can be calculated by adding the molar mass of aluminum (26.98 x 2 = 53.96) to the molar mass of sulfur (32.06 x 3 = 96.18), giving a total molar mass of 150.14 g/mol.

Next, we can calculate the percentage composition of each element by dividing its mass by the total molar mass and multiplying by 100.

For aluminum:
(53.96 g/mol ÷ 150.14 g/mol) x 100 = 35.94%

For sulfur:
(96.18 g/mol ÷ 150.14 g/mol) x 100 = 64.06%

Therefore, the percentage composition of aluminum sulfide is 35.94% aluminum and 64.06% sulfur.


Calculating the percentage composition of a compound involves determining the relative mass of each element in the compound and expressing it as a percentage of the total mass. In this case, we used the chemical formula for aluminum sulfide and the atomic masses of aluminum and sulfur to determine the total molar mass of the compound. We then divided the mass of each element by the total molar mass and multiplied by 100 to get the percentage composition. This calculation is useful in determining the properties and behavior of a compound, as well as in predicting the outcome of chemical reactions involving the compound.

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The following is the reason why are feedback loops a way to see what direction our planet may be heading and how to prevent harmful changes.

What is a feedback loop?

A feedback loop is what accelerates or decelerates the trend. Our planetary system has many feedback loops to understand which direction the Earth is moving, including environmental feedback, climate feedback, and warming feedback. You can take the necessary steps to control it and see the results through a feedback loop. This will prevent harmful changes.

There are two types of loops. Positive feedback accelerates environmental deterioration, negative feedback means environmental deterioration. Global warming is a current trend in today's world where positive feedback is running, meaning that warming is increasing. Understanding feedback can help us know the direction of the planet. can.

Hence, You can prevent disasters by knowing the trend of increase and decrease. If the warming progresses, we can take the necessary steps to control it and see the results through a feedback loop. This will prevent harmful changes.

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The amount of numbers could he set before he ran out of some digits if he had 100 of each of the digits from 0 to 9 is maximum of 1000 numbers.

To find out how many numbers the printer could set before running out of some digits, we need to consider the maximum number of each digit that he would need to print all the numbers from 1 to 1,000.

Starting with the thousands place, we know that there are no digits from 1 to 9 that would be needed since there are no numbers between 1 and 999 that have a digit in the thousands place.

Moving on to the hundreds place, we know that we would need 100 of each digit from 1 to 9 to print all the numbers from 100 to 999. That's a total of 900 digits needed.

Finally, in the ones place, we know that we would need 100 of each digit from 0 to 9 to print all the numbers from 1 to 99 (since we've already accounted for the numbers from 100 to 999 in the hundreds place). That's another 1,000 digits needed.

Adding up all the digits we need, we get:

0 x 100 = 0

1-9 x 100 = 900

0-9 x 100 = 1000

Total = 1900 digits needed

Since the printer has 100 of each digit, the maximum number of numbers he could set before running out of some digits is:

100 x 10 = 1000

So he could set a maximum of 1000 numbers before running out of some digits.

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Answer:

Option C, an elongated ridge designed by engineers that runs parallel to a stream channel

Explanation:

A natural or artificial levee is basically a ridge constructed along a river bank to regulate the water level in the stream.

It run along the river embankment and hence can be said that it runs parallel to the river length

Hence, option C is correct

Answer: 64 I think

Explanation:

unsure of wether or not there is a specific shape given but the original equation for volume is length x width x height so just multiply all..

4 x 4 = 16

16 x 4 = 64

Okay, let's solve this step-by-step without using quadratics:

1) The equilibrium constant Kc = 0.36 means the equilibrium lies to the left. So there will be more N2O4 than NO2 at equilibrium.

2) The initial concentration of N2O4 is 0.1 mol dm^-3. Let's call this [N2O4]initial.

3) At equilibrium, the concentrations of N2O4 and NO2 will be [N2O4]equil and [NO2]equil respectively.

4) We know the equilibrium constant expression for this reaction is:

Kc = ([NO2]equil)^2 / [N2O4]equil

5) Setting this equal to 0.36 and plugging in 0.1 for [N2O4]initial, we get:

0.36 = ([NO2]equil)^2 / (0.1 - [NO2]equil)

6) Simplifying, we get:

0.036 = [NO2]equil^2

7) Taking the square root of both sides, we get:

[NO2]equil = 0.06 mol dm^-3

So the equilibrium concentration of NO2 is 0.06 mol dm^-3.

Let me know if you have any other questions! I can also provide a more step-by-step explanation if needed.

Answer:

Physical dependence is characterized by tolerance and withdrawal. Drug or substance dependency is psychological.

Answer: 2, 13, 8, 10 (sorry if i’m wrong lol)

Explanation:

Answer:

The cells of the body produce waste materials. The body needs to get rid of these waste materials because they can make us sick. Getting rid of this waste keeps us healthy.

Explanation:

____________________________________________________________

____________________________________________________________

The cells inside of your and my body alike produce these waste materials. We need to get rid of them because if we don't, we could get sick! Or possibly cause something worse...

____________________________________________________________

____________________________________________________________

Well, the answer kind-of explains all I would want to say! Feel free to copy and paste this on your assignment, but do NOT use the sample answer like the other person who answered this did. (The sample answer you should NOT use: "The cells of the body produce waste materials. The body needs to get rid of these waste materials because they can make us sick. Getting rid of this waste keeps us healthy.") It could make your teachers or parents suspicious of your work! Anyways, have a good day! ❥

Answer:

Should be number 4, quartz.

Explanation:

Quartz is rougher than calcite, therefore it's able to scratch it.

Answer:

Friction is the force that opposes the motion of a solid object over another. There are mainly four types of friction: static friction, sliding friction, rolling friction, and fluid friction.

The number of carbon atoms present in 1.25 mol of silver acetate is 1.875 × 10²³.

Avogadro's number is define as the number of atoms of any substance present in one mole of that substance, and it is equal to 6.022 × 10²³, i.e.
1 mole = 6.022 × 10²³ atoms/mol

Given moles of silver acetate = 1.25 moles

Number of atoms of silver acetate in 1.25 moles = 1.25 × 6.022 × 10²³ = 7.5×10²³

Molecular formula of silver acetate is CH₃CO₂Ag, means in this molecule total 8 atoms are present so number of carbon atom will be calculated as:

Carbon atoms = (2× 7.5 × 10²³) / 8 = 1.875 × 10²³ atoms [here we multiply by 2 because 2 atoms of carbon is present in olecule]

Hence required atoms of carbon is 1.875 × 10²³.

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