When comparing two sets of data, which one is more precise? Select one: A) The one with the smaller standard deviation B) The one with the mean further from the known value. C) The one with the mean closer to the known value D) The one with the larger standard deviation

Answer:

1. C₂H4

Explanation:

The only saturated hydrocarbons are Alkanes: From that we can see that: C3H12, C3H8 and C4H10 are saturated. Therefore: C2H4 is unsaturated

Chromium acetate is diamagnetic because it does not have any unpaired electrons in its orbitals, which are required for magnetic behavior.

Diamagnetic materials are materials that are not attracted to magnetic fields, and they behave in a manner that is opposite to magnetic materials, known as paramagnetic materials.

Chromium acetate has a complete electron shell configuration with all electrons paired, which means that the electrons are paired in the orbitals, and there is no net magnetic moment.

As a result, chromium acetate does not exhibit any magnetic properties and is considered to be diamagnetic.

The diamagnetic behavior of chromium acetate can be explained by the principles of quantum mechanics and the orbital configuration of the atoms in the molecule.

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Answer: 3.5 moles

Explanation:

For every 2 moles of sulfur consumed, there are 3 moles of oxygen consumed.

This means that sulfur is the limiting reactant, meaning that 2(3)=6 moles of oxygen will be consumed.

Thus, 9.5-6=3.5 moles of oxygen will remain.

Kw is roughly equivalent to 1.0 x 10⁻¹⁴ at room temperature. The equilibrium constant for the autoionization of water, also known as the ion product constant, is expressed by the equation Kw = [H₃O⁺][OH⁻].  

It represents the product of the concentrations of hydronium ions (H₃O⁺) and hydroxide ions (OH⁻) in a given solution of water at equilibrium. At room temperature, Kw is approximately equal to 1.0 x 10⁻¹⁴, which means that the product of [H₃O⁺] and [OH⁻] must always be equal to this value.

This equation is an expression of the law of mass action, which describes the equilibrium state of a reversible chemical reaction. The Kw value is important for calculating the pH of a solution and understanding the acidity and basicity of a substance.

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What is the correct expression for the equilibrium constant for the autoionization of water?

A

\(\frac{[\textrm{H}_3\textrm{O}^+][\textrm{OH}^-]}{[\textrm{H}_2\textrm{O}][\textrm{H}_2\textrm{O}]}\)

B

\(\frac{1}{[\textrm{H}_2\textrm{O}][\textrm{H}_2\textrm{O}]}\)

C

\([\textrm{H}_3\textrm{O}^+][\textrm{OH}^-]\)

Unanswered

Answer:

1)physical change

Explanation:

2)chemical change

These are the energy emission spectrum of hydrogen.

What is energy emission spectrum?

When an atom or molecule changes from a high energy state to a lower energy state, electromagnetic radiation at a range of frequencies is released. This spectrum is known as the emission spectrum of a chemical element or chemical compound.

What is hydrogen ?

The most fundamental member of the chemical element family is hydrogen (H), a colorless, odorless, tasteless, combustible gaseous material.

There are generally 4 energy levels in a hydrogen spectrum. The lines formed is depends on the transitions occurs.

For n=6, there are 15 lines possibly formed. En to E(n-1) transitions are the possible transitions. It forms 5 series named Lyman, Balmer, Paschan, Brachet and Pfund series.

When n=6,

En to E(n-1) means 6 to 5, 5 to 4, 4 to 3, 3 to 2 and 2 to 1 therefore 5 lines formed.

En to E(n-2) means 6 to 4, 5 to 3, 4 to 2, 3 to 1 and therefore 4 lines formed.

En to E(n-3) means 6 to 3, 5 to 2, 4 to 1 and therefore 3 lines formed.

En to E(n-4) means 6 to 2, 5 to 1 and therefore 2 lines formed

En to E(n-5) means 6 to 1 and therefore 1 line is formed

Thus altogether 6 energy levels will give 15 lines.

Therefore, these are the energy emission spectrum of hydrogen.

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Answer:

C2H4O2

Explanation:

In this molecule two carbon molecule , four hydrogen molecules and two oxygen molecules are present . So C₂H₄O₂ is the correct molecular formula of this structure. Option B is correct.

The molecular formula defines the number of atoms of each element in one molecule of a compound. It shows the actual number of each atom in a molecule.

An empirical formula represents the simplest whole-number ratio of various atoms present in a compound. The molecular formula shows the exact number of different types of atoms present in a molecule of a compound.

In this structure there are 2 carbon molecules, 4 hydrogen molecules and 2 oxygen molecules are present.

Hence , the option B is correct . The molecular formula of this structure is C₂H₄O₂.

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Answer:

Mass of Cl = 35.5

Mass of Cl2 => 35.5×2

=> 71 g/mol

hope that helps ✌

71

The atomic mass of chlorine is equal to the molar mass of chlorine so the molar mass of chlorine is 35.5

=> molar mass for Cl^2: 35,5*2=71

Wavelength (L) is calculated using: L = gT²/2π, here g=9.8 m/s2 and T is wave period in seconds.

Wavelength of a wave describes how long the wave is and the distance from the "crest" (top) of one wave to the crest of next wave is called wavelength. We can also measure from the "trough" (bottom) of one wave to trough of next wave and get the same value for the wavelength.

We measure wavelength in following ways:

Use photometer to measure the energy of wave.

Convert energy into joules (J).

Divide energy by Planck's constant, 6.626 x 10⁻³⁴, to get the frequency of  wave.

Divide speed of light, ~300,000,000 m/s, by frequency to get wavelength.

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The compound which has a very large value of Ka in aqueous solution is HNO3.

Ka is an acid dissociation constant that measures the degree of ionization of an acid in a solution and tells how much of it will dissociate into its ions.

The larger the value of Ka, the greater the ionization and the stronger the acid.

Let's take a look at the dissociation equations and values of Ka of all the given compounds:

a. H3PO4:

H3PO4 ⇌ H+ + H2PO4- (Ka1 = 7.5 × 10^-3)

H2PO4- ⇌ H+ + HPO42- (Ka2 = 6.2 × 10^-8)

HPO42- ⇌ H+ + PO43- (Ka3 = 4.8 × 10^-13)

The successive values of Ka decrease greatly. Hence, H3PO4 is not the answer.

b. NaCl:

NaCl does not dissociate into ions in solution, so it is not an acid. Hence, it is not the answer.

c. NH3:

NH3 + H2O ⇌ NH4+ + OH- (Kb = 1.8 × 10^-5)

NH3 is not an acid; it is a weak base. Hence, it is not the answer.

d. HNO3:

HNO3 ⇌ H+ + NO3- (Ka = 24)

Nitric acid is a strong acid, and it has a very large value of Ka in aqueous solution. Hence, HNO3 is the answer.

e. KOH:

KOH ⇌ K+ + OH- (Kb = 1.0 × 10^-14)

KOH is not an acid; it is a strong base. Hence, it is not the answer.

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Hello, 3Coli Here!

Your Answer is Here:

I would recheck, redo, and revise my answers, if necessary. Also, I can look at the lesson again, if I forgot something. So that's what I would do.

Hopefully, this helps!

Ask your question below!

Answer:

I will just revise and check my answer, or I can redo the lesson.

Explanation:

Have a good day! :D

Answer:

7.92 g/mL.

Explanation:

The following data were obtained from the question:

Mass of Iron = 28.5 g

Volume of water = 45.5 mL

Volume of water + Iron = 49.1 mL.

Density of Iron =.?

Next, we shall determine the volume of the iron. This can be obtained as illustrated below:

Volume of water = 45.5 mL

Volume of water + Iron = 49.1 mL.

Volume of iron =.?

Volume of iron = (Volume of water + Iron) – (volume of water)

Volume of iron = 49.1 – 45.5

Volume of iron = 3.6 mL

Finally, we shall determine the density of iron as follow:

Mass of Iron = 28.5 g

Volume of iron = 3.6 mL

Density of Iron =.?

Density = mass/volume

Density = 28.5/3.6

Density = 7.92 g/mL

Therefore, the density of the iron is 7.92 g/mL

The number of moles of oxygen that will dissolve in a 50 L fish tank of water at 25°C with a partial pressure of 0.21 atm is approximately 0.0242 moles.

To calculate the number of moles of oxygen that will dissolve in the fish tank, we can use the formula:

Moles of O₂ = (Volume of water × Partial pressure of O₂ × Density of water) / Henry's constant

Given the volume of water (V) is 50 L, partial pressure of oxygen (P) is 0.21 atm, density of water (ρ) is 1 kg/L, and Henry's constant (K) for oxygen is 4.34 × 10⁴ atm, we can plug these values into the formula:

Moles of O₂ = (50 L × 0.21 atm × 1 kg/L) / (4.34 × 10⁴ atm)

Moles of O₂ = (10.5 kg) / (4.34 × 10⁴ atm)

Moles of O₂ ≈ 0.0242 moles

Therefore, approximately 0.0242 moles of oxygen will dissolve in a 50 L fish tank of water at 25°C if the partial pressure of oxygen is 0.21 atm.

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The new volume V₂ of the balloon is 266 cm³.

The experimental gas law known as Charles' law describes how gases tend to expand when heated. The law of volumes is another name for it.

According to Charles's law,

V₁/T₁ = V₂/T₂

In question it has been given,

V = Volume

T = Temperature

V1 = 494cm3

T1=455k

T2=245k

V2 ( New Volume of Balloon)=?

Charles's law formula is :  = V₁/T₁ = V₂/T₂

Putting values in Formula of charles's law

V₁/T₁ = V₂/T₂

= 494 / 455 = V₂/ 245

Cross Multiply each other,

V₂×455K= 494 cm³×245K

V₂ =494cm³×245K÷455K

V₂ = 266 cm³

Hence, the new volume of the balloon is 266 cm³

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Answer:

It reduces by ganing two electrons.

Answer:

Burning wood

Explanation:

Burning wood is a chemical change. Dissolving sugar is a physical change because it is still sugar, just dissolved. A broken bottle a physical change because it is just broken. Melting wax is a physical change because it is still wax, just melted. Burnt wood is a chemical change because it is now ash

Answer:

breaking a bottle

Explanation:

Hydrochloric acid is a stronger acid than sulphuric acid because the \(pK_a\)value of HCl is smaller than H₂SO₄

Acids are substances that contain hydrogen and can donate H⁺ ions to another substance.

Hydrochloric acid and sulphuric acid both are stronger acids as compared to other acids

HCl dissolves in an aqueous solution to give out H⁺ and Cl⁻ and is completely dissociated.

H₂SO₄ dissolves in an aqueous solution to give out H₃O⁺ and HSO₄⁻ but the ions are partially dissociated

However, HCl is a stronger acid than H₂SO₄ because of the difference between the pKa values of both acids.

The \(pK_a\) value of HCl is -6.3 and the \(pK_a\) of H₂SO₄ is -2.8.

The smaller the \(pK_a\) value, the stronger the acid.

When HCl reacts with baking soda it gives out common salt, water, and carbon dioxide as gas. The reaction is exothermic

\(NaHCO_3 + 2HCl \rightarrow NaCl +H_2O + CO_2\)

Also, when H₂SO₄ reacts with baking soda it gives out sodium sulfate, water, and carbon dioxide as gas. The reaction is exothermic

\(2NaHCO_3+H_2SO_4 \rightarrow Na_2SO_4 +2H_2O + 2CO_2\)

Hence, HCl is a stronger acid than H₂SO₄ because of its \(pK_a\) value.

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b. elemental composition d. shape and e. quantum mechanical effects  three factors significantly influence the properties of nanoscale materials.

Nanoscale material are the set of substances that have least one Critical dimension less than 100 nanometer. That have magnetic, electrical and optical properties. S and P blocks are there in the nanoscale materials. Nanoscale materials are mostly concentrated in the s and p blocks Nano elements. Nanoscale material have have structure with dimensions at the nanoscale.so it has size of 1-100nm.The shape of the nanomaterials are in various shapes like rod shape spherical shape ,fibers and cups. In the nanoscales quantum effects dominates the electrical optical properties of the system. They create new opportunity for manipulating the response of the system.

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Answer:

The new substance will need more energy to form its chemical bonds than the old substance will release. ... More energy will be released from the old substance than the new substance will need to form its chemical bonds.

Explanation:

This is the answer I got. Hope it's really helpful

Answer:

"Which is evidence that a chemical reaction has likely occurred?"

The correct answer would be,

B. the formation of a precipitate

Explanation:

Got it right on my test, have a great day!

Answer

a) Ba

b) Si

c) Zn

Explanation

The presence of unpaired electrons in an atom orbitals indicates paramagnetic properties. When no unpaired electron is observed in an atom orbitals, such an atom possesses diamagnetic properties.

Therefore, atoms in their ground states that are expected to be diamagnetic in the options are:

a) Ba

b) Si

c) Zn

The correct option for a diluted solution would be (b) 2.0 g of solute dissolved in 1.0 L of water.

The correct choice for a diluted solution is option B, 2.0 g of solute dissolved in 1.0 L of water. The concentration of this solution can be calculated as:

Concentration = mass of solute/volume of solution

Substituting the values, we get:

Concentration = 2.0 g / 1.0 L = 2.0 g/L

This concentration is relatively low, indicating a diluted solution. Option A has a high concentration of 350 g/L, making it a concentrated solution. Option C has a concentration of 30 g/L, which is lower than option A but higher than option B, making it a moderately concentrated solution.

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Answer:

167.5g

Explanation:

From the question, we know the mass of NaCl and the molar mass of NaCl, so we can calculate the number of moles of NaCl:

Moles = mass ÷ molar mass

The molar mass of NaCl can be calculated by adding the relative formula masses of the elements Na and Cl:

23.0 + 35.5 = 58.5

We can use the formula to find the number of moles of NaCl:

moles = 138 ÷ 58.5

= 2.35897...

Now, we need to find the mass of Cl2. Rearranging the formula of moles = mass ÷ molar mass

mass = moles × molar mass

Calculating the molar mass of Cl2 by adding the relative atomic masses:

35.5 + 35.5 = 71

Hence the mass is:

2.35897... × 71 = 167.5g (to 1dp)

Answer

The variation in the rate k (k1/k2) is 0.5707 s^-1

Step-by-step explanation:

Given the following parameters

Activation energy = 43.5Kj.mol

T1 = 300K

T2 = 310K

R = 8.314 J.Kmol

Answer:

proposed an early model of the atom as a central nucleus containing protons and neutrons being orbited by electrons in shells. As previously discussed, there is a connection between the number of protons in an element, the atomic number that distinguishes one element from another, and the number of electrons it has. In all electrically-neutral atoms, the number of electrons is the same as the number of protons. Each element, when electrically neutral, has a number of electrons equal to its atomic number.

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3

Explanation:

Answer:

It is called homoogeneous

Answer:

it's called a homogeneous mixture.

Answer:

He will burn 50 meters in 5 days

Explanation:

multiply 10 and 5.  

Answer:

80450 meters

Explanation:

To go from miles to meters multiply by 1609, so do 1609 x 10. Next, take that number times 5 because that is the number of days.

- Let me know if you need further explanation.

Answer:

Both are only physical changes