a sample of ideal gas at room temperature occupies a volume of 34.0 l at a pressure of 282 torr . if the pressure changes to 1410 torr , with no change in the temperature or moles of gas, what is the new volume, v2 ? express your answer with the appropriate units.

The variable that is NOT required to calculate the Gibbs free-energy change for a chemical reaction is the reaction rate.

The Gibbs free-energy change (ΔG) for a chemical reaction can be calculated using the equation:

ΔG = ΔH - TΔS

where:

ΔH is the change in enthalpy (heat) of the reaction,

T is the temperature in Kelvin,

ΔS is the change in entropy (disorder) of the reaction.

The reaction rate, which describes how fast a reaction proceeds, is not directly involved in the calculation of ΔG.

The Gibbs free-energy change depends on the thermodynamic properties of the reaction (ΔH and ΔS) and the temperature (T), but it is independent of the reaction rate.

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Answer:

Explanation:

Although stochiometry is very scary loking math it is very easy and and fun to learn.

First Balance the chemical equation (Meaning there are equal amounts of elements at end and begining

Second Convert your units to mols

mols are what allows for stochiometry math to work to know how to find the mols takes practice and knowing when to write the math.

Then from there is just knowing how to go from grams to kg or g to mg and etc

Answer:

The limiting reactant is the covers.

We are left with 3750 sheets of lined paper, 1125 sheets of graph paper and 25 staples.

Explanation:

the reaction is:

B - book

C - cover

Sl = sheet of lined paper

Sg - sheet of graph paper

St - staple

1B = 2C + 50Sl + 25Sg + 3St

We have covers for 150/2 = 75 books

We have lined paper for 7500/50 = 150 books

We have graph paper for 3000/25 = 120books

We have Staples for 250/3 = 83.(3) books, so for 83 books as we cannot make 1/3 of a book.

Because we only have covers for 75 books, covers are the limiting reactant.

After making 75 books we are left with:

0 covers

7500 - 75*50 = 3750 sheets of lined paper

3000 - 75*25 = 1125 sheets of graph paper

250 - 75*3 = 25 staples

The limiting reactant should be the covers.

We are left with 3750 sheets of lined paper, 1125 sheets of graph paper, and 25 staples.

The reaction should be like:

B - book

C - cover

Sl = sheet of lined paper

Sg - sheet of graph paper

St - staple

Now the equation should be

1B = 2C + 50Sl + 25Sg + 3St

We have covers for 150/2 = 75 books

We have lined paper for 7500/50 = 150 books

We have graph paper for 3000/25 = 120books

We have Staples for 250/3 = 83.(3) books, so for 83 books as we cannot make 1/3 of a book.

Now the left should be

7500 - 75*50 = 3750 sheets of lined paper

3000 - 75*25 = 1125 sheets of graph paper

250 - 75*3 = 25 staples

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Water is a polar substance. Polar solvents dissolve polar substances. Now, the bond between carbon and hydrogen is a covalent bond, because the electronegativity difference between these two elements is less than 1.7.

Therefore, the low solubility of hexane is due to the fact that hexane is nonpolar with covalent bonds.

Answer: C) Nonpolar covalent

To write the balanced complete molecular chemical equation and the balanced net ionic chemical equation, including phase labels, we need to first understand what they are .

Molecular chemical equation: A molecular equation is a chemical reaction equation where the reactants and products are expressed as molecules and the charges aren't shown. A molecular equation can show the reactants and products as solids, liquids, or gases with their states written in parenthesis after each molecule.

Net ionic chemical equation: The chemical equation in which all the spectator ions are removed is known as the net ionic chemical equation. The net ionic equation represents the actual chemical change taking place in the reaction. It demonstrates the substances and ions that actually take part in the chemical change.

Here is an example of how to write the balanced complete molecular chemical equation and the balanced net ionic chemical equation, including phase labels:

Example: Sodium chloride reacts with silver nitrate to form silver chloride and sodium nitrate.

Complete Molecular Chemical Equation:

NaCl(aq) + AgNO3(aq) → AgCl(s) + NaNO3(aq)

Balanced Net Ionic Chemical Equation:

Ag+(aq) + Cl-(aq) → AgCl(s) + Na+(aq) + NO3-(aq)

The phase labels used in the above equations are:aq: aqueous phase (dissolved in water)s: solid phase (precipitate)

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There are 4.48 x 10² moles of iron atoms present in 2.50 x 10²³ atoms.

In order to answer this question, we must first determine how many moles of iron atoms are present in 2.50 x 10²³ atoms. To do this, we need the atomic mass of iron which is 55.85 g. This means that one mole of iron has a mass of 55.85 g.

Therefore, in order to determine the number of moles present in 2.50 x 10²³ atoms, we must divide the mass of 2.50 x 10²³ atoms by 55.85 g, which gives us a result of 4.48 x 10² moles of iron atoms. So, the answer to the question is that there are 4.48 x 10² moles of iron atoms present in 2.50 x 10²³ atoms.

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Answer:

the atomic mass of an element is the average mass of an element naturally occurring atom, or isotopes, taking into account the percentage of each isotopes​

Explanation:

The atomic mass of an element is obtained by obtaining the relative abundances (in percentages) of naturally occurring atoms and the masses of the isotopes. The atomic mass can also be defined as the sum of the protons and the neutrons in the nucleus of an element.

In the periodic table, the atomic mass is indicated below the symbol of each of the elements and is usually in the decimal form.

Answer:

High pressure.

Explanation:

The weather should have clear skies, if it is a Large "L" it would be could be stormy.

Hope this helps! have a great day!

Answer:

C. Density

all the others are chemical properties

Answer:

C: Density

Explanation:

The oxidation number of Na in the compound Na2CO3 is +1.

To determine the oxidation number of Na in Na2CO3, we need to consider the known oxidation numbers of other elements and the overall charge of the compound.

1. The compound Na2CO3 contains two Na atoms and one C atom, along with three O atoms.

2. Oxygen (O) typically has an oxidation number of -2, unless it is in a peroxide where it is -1.

3. Carbon (C) is more electronegative than hydrogen (H) but less electronegative than oxygen (O), so it usually has an oxidation number of +4 in compounds.

4. The compound Na2CO3 has a neutral charge, which means the sum of the oxidation numbers of all the elements must be zero.

5. Let's assign the oxidation number of Na as x. Since there are two Na atoms, the total oxidation number contribution from Na is 2x.

6. The oxidation number of C in CO3 is +4, and the oxidation number of O is -2. Since there are three O atoms in CO3, the total oxidation number contribution from O is 3*(-2) = -6.

7. Setting up the equation: 2x + 4 + (-6) = 0.

8. Solving the equation: 2x - 2 = 0, 2x = 2, x = 1.

Therefore, the oxidation number of Na in Na2CO3 is +1.

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Peptide bonds were amide connections among two amino acids' -carboxyl and -amino groups.

Body protein as well as other vital ammonia substances including creatine, peptidases, and some neurotransmitters can indeed be produced sans amino acids. Although limitations are expressed in terms of protein, amino acids are indeed a biological necessity.

The building and repair of tissue, the production and operation of enzymes, food digesting, the movement of molecules, and other biological and chemical activities in many sections in our body all depend on amino acids.

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Answer:

1. chemical change

2. true

3. an unequal sharing

Explanation:

Answer:

They will be considered ions of the same element.

Explanation:

Ions form from elements when they gain or loss an electron, causing the number of protons (positively charged) to be unequal to the number of electrons (negatively charged), resulting in a net charge.

If there are more electrons than protons (from an element gaining 1 or more electrons), the ion is negatively charged and is called an anion.

If there are more protons than electrons (via the loss of electrons), the ion is positively charged and is called a cation.

Answer:

\(\boxed {\boxed {\sf 0.3375 \ mol \ NaCl}}\)

Explanation:

Molarity is found by dividing the moles of solute by liters of solution.

\(M=\frac{moles \ of \ solute }{liters \ of \ solution}\)

We know the molarity is 0.45 M and there are 0.750 liters of solution. The solute is NaCl (sodium chloride). We can substitute the values into the formula.

\(0.45 \ M = \frac{ moles \ of \ NaCl}{ 0.750 \ L }\)

The molarity (M) can also be represented by mol/L

\(0.45 \ mol/L = \frac{ moles \ of \ NaCl}{ 0.750 \ L }\)

We are solving for the moles of solute, so we must isolate the numerator. It is being divided by 0.750 liters. The inverse operation is multiplication, so multiply both sides of the equation by 0.750 L.

\(0.750 \ L * 0.45 \ mol/L = \frac{ moles \ of \ NaCl}{ 0.750 \ L }*0.750 \ L\)

The liters will cancel out.

\(0.750 * 0.45 \ mol = { moles \ of \ NaCl}\)

\(0.3375 \ mol \ = moles \ of NaCl\)

There are 0.3375 moles of NaCl in a 0.750 liter solution with a molarity of 0.45 M.

The solubility rules can be used to deduce that;

1 - Insoluble

2 - Soluble

3 - Soluble

4 - Soluble

5 - Insoluble

6 - Soluble

7 - Soluble

8 - Soluble

9 - Soluble

A set of broad recommendations for predicting the solubility of various substances in water are provided by the solubility rule, often known as the solubility guidelines or the solubility table. These principles help determine whether a chemical will dissolve in water to form a homogeneous solution or precipitate out as a solid. They are based on empirical facts.

The designation of the solubility rules served as the basis for labeling the substances as soluble or insoluble.

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From the given SN1 reaction (picture attached), the major organic product will be 3-ethylpentan-3-ol, the nucleophile, substrate, leaving group, and the rate-limiting step is identified in the attachment.

In the given reaction an alkyl halide 3-bromo-3-ethylpentane is used as a substrate. In the first step of the reaction, alkyl halide dissociates and a carbocation with a Bromide ion generates. The first step of the reaction mechanism is the slow and rate-determining step. In the first step, 3-bromo-3-ethylpentane is the substrate and bromide is the leaving group. In the second step, the water molecule acts as a nucleophile and attacks carbocation. In the final step, bromide removes hydrogen from the water molecule, and the product results.

The complete question and reaction mechanism are attached as a picture.

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Answer:

《HOPE IT WILL HELP YOU 》

Explanation:

Alternative fuel under the energy policy act of 1992.

The atomic radius of an atom describes its  a measure of the size of its atom.

The total distance from an atom's nucleus to its outermost electron orbital is typically defined as the atomic radius.

It can be described more simply as something akin to the radius of a circle, with the nucleus acting as the circle's centre and the outermost orbital of the electron as the circle's perimeter. Trends that help explain how atomic radii change start to appear as you start moving across or down the periodic table.

The net positive charge experienced by the valence electron is known as the effective nuclear charge (Zeff) of an atom. The core electrons shield some of the positive charge, preventing the valence electron from sensing the entire positive charge.

Thus, The atomic radius of an atom describes its  a measure of the size of its atom.

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The atomic radius of an atom describes its size or the distance from the nucleus to the outermost shell of electrons. It varies across the periodic table, decreasing from left to right across a period and increasing from top to bottom within a group.

The atomic radius of an atom describes its size or the distance from the nucleus to the outermost shell of electrons. It is an important property that varies across the periodic table. As you move across a period from left to right, the atomic radius generally decreases. This is because the number of protons in the nucleus increases, resulting in a stronger attraction between the electrons and the nucleus. The increased positive charge pulls the electrons closer to the nucleus, reducing the atomic radius.

On the other hand, as you move down a group, the atomic radius generally increases. This is because new energy levels or shells are added, increasing the distance between the nucleus and the outermost shell of electrons. The additional energy levels shield the outer electrons from the attraction of the nucleus, leading to a larger atomic radius.

The atomic radius affects various properties of elements. For example, elements with larger atomic radii tend to have lower ionization energies, as it is easier to remove an electron from a larger atom. Additionally, elements with larger atomic radii are generally more reactive, as the outer electrons are further from the nucleus and more easily involved in chemical reactions.

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pH is the measurement of the intensity of a solution of how much it is acid or base. Acid has a pH of less than 7 and the base has a pH of more than 7. The solution is neutral at pH 7.

1. Given information,

The hydrogen ion concentration ([H⁺]) of a solution = 8.9 × 10⁻⁷ mol/L.

pH = -log[H⁺]

pH = -log(8.9 × 10⁻⁷) = -(-6.05) = 6.05

2. Given information,

The pH of a solution = 12.35

[H⁺] = 10^(-pH)

[H⁺] = 10^(-12.35) ≈ 4.21 × 10⁻¹³ mol/L

Therefore, the pH of the solution is 6.05 and the hydrogen ion concentration of the solution is approximately 4.21 × 10⁻¹³ M.

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sorry I don't know 4one

i HOPE IT'S HELP

Answer:

2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2

Explanation:

2 Cu2S + 3 O2 = 2 Cu2O + 2 SO2

The idea of the atomic nature of matter was first developed by John Dalton.

He introduced the atomic theory, which proposed that matter was made up of tiny, indivisible particles called atoms. This theory was based on his observations and experiments on the behavior of gases

.Dalton's atomic theory had several postulates that helped explain the properties of matter. These postulates were:

All matter is made up of atoms, which are tiny, indivisible particles

.Each element is composed of atoms that are identical in size, shape, and chemical properties.

Atoms of different elements have different sizes, shapes, and chemical properties.

Atoms combine in fixed ratios to form compounds, and the ratios of their masses are related by whole numbers.

Atoms are indestructible and cannot be created or destroyed in chemical reactions

.However, Dalton's atomic theory was later modified and expanded upon by other scientists, including J.J. Thomson, Ernest Rutherford, and Niels Bohr, as new discoveries about the structure and behavior of atoms were made.

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The decreasing order of ionization energy will be Mg >Al >P>K.

Ionization energy sometimes referred to as ionization potential, would be the amount of energy it takes to eliminate an electron from a single, isolated atom or molecule.

On moving top to bottom in the periodic table, ionization energy will decrease rapidly.

Al =13 (group 3)

P =15 (group 5)

Mg =12 (group 2)

K =19 (group 1)

The decreasing order of ionization energy will be Mg >Al >P>K.

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Answer:

1. A neutralization reaction is when an acid a base react to form water and salt and involves the combination of H+ ions and OH- negative ions to generate water.

2. starchy refined carbohydrates such as chips, bread, pasta, etc

3.a. brush with fluoride toothpaste after eating or drinking

b. rinse your mouth

c. visit your dentist regularly

d. consider dental sealants

e. drink some tap water

f. avoid frequent snacking and sipping

g.eat tooth- healthy foods

h. consider fluoride treatments

I. ask about antibacterial treatments

j.combined treatments

4. Add diary: the fiery chemical in hot chillies, capsaicin, likes to bound itself onto a compound in milk, which neutralises the burn. Add a generous dollop sour cream, creme fraiche, yogurt or even a touch of milk or cream to spicy foods . For best results tho go with full fat diary.

5.a. Gypsum ( calcium sulphate, CaSo4. 2H2O)

b. baking soda or zinc carbonate

c. lithium hydroxide

d. lemon juice and ordinary vinegar

e.distilled white vin6

The net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons is +1. Thus option A is correct.

Net charge is defined as when the number of electrons in an atom does not equal the number of protons, the atom is said to be unstable.
If the number of electrons are less than the number of protons, then they will have positive net charge.

If the number of electrons are more than the number of protons, then they will form negative net charge.

Electrons are defined as negatively charged subatomic particle which together with protons and neutrons forms atom.

Thus, the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons is +1. Thus option A is correct.

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The volume of a sphere is the amount of space inside a sphere. A sphere is a three-dimensional geometric shape that is perfectly round and is created by rotating a circle about its diameter.

To find the radius of the aluminum sphere, we need to use the formula for the volume of a sphere and the density of aluminum. The formula for the volume of a sphere is:

V = (4/3)πr³

The density of aluminum is 2.7 g/cm³. We can use the formula for density to find the volume of the sphere:

Density = mass/volume

Volume = mass/density

V = 37 g / 2.7 g/cm³

V = 13.7 cm³

Now we can plug the volume into the formula for the volume of a sphere and solve for the radius:

13.7 cm³ = (4/3)πr³

r³ = (13.7 cm³)(3/4π)

r³ = 10.4 cm³

r = ∛10.4 cm³

r = 2.2 cm

Since 1 inch is equal to 2.54 cm, we can convert the radius from cm to inches:

r = 2.2 cm * (1 inch / 2.54 cm)

r = 0.87 inches

To two significant figures, the radius of the aluminum sphere is 0.87 inches.

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Magnesium (Mg) is safer to use than beryllium (Be) because of their differences in chemical properties. Beryllium is highly toxic and can cause serious health issues such as lung cancer and chronic beryllium disease when inhaled or ingested.

On the other hand, magnesium is a relatively non-toxic element that is essential for various bodily functions, including muscle and nerve function, heart rhythm regulation, and bone health. The differences in toxicity are due to the fact that beryllium has a very small atomic radius and forms highly stable compounds, which makes it very reactive and easily absorbed by the body. Magnesium, on the other hand, has a larger atomic radius and forms less stable compounds, which makes it less reactive and less likely to be absorbed by the body. Therefore, magnesium is considered to be safer to use than beryllium.

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I think the element is oxygen

Answer:

Yes, it is

Explanation:

Silicon (IV) oxide, commonly known as silica is a substance that majorly constitutes SAND. It has the chemical formula, SiO2, which contains a combination of silicon and oxygen.

The IUPAC name of SiO2 is Silicon IV oxide, which can also be referred to as Silicon dioxide because the structure the compound contains two (-di) oxygen atoms. Hence, based on the question, silicon(IV) oxide is the same as silicon dioxide.