Summary about helium

a substance that can’t be broken down into another substance.

If a mixture is prepared by mixing 29.27 mL of the blue dye solution with 35.00 mL of the red dye solution and 14.73 mL of the yellow dye solution, the molar concentration of the blue dye in the mixture is

MB'=0.1189M

Generally, the equation for the moles  is mathematically given as

Moles=Molarity *volume

Therefore

For Blue dye

MB=0.3523*25.27*1/1000ml

MB=8.90*10^{-3}

For red dye

MR=0.1017*35.27*1/1000ml

MR=3.55*10^{-3}

For yellow dye

MY=0.3523*14.73*1/1000ml

MY=2.27*10^{-3}

Where

Total volume is

T=25.27+35.ml+14.73

T=75ml

In conclusion, The molar conc of blue dye is

\(MB'=\frac{8.90*10^{-3}*1000}{75}\)

MB'=0.1189M

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For the given reactions:
1. 2A(g) + 3B(g) → C(g) + D(l): If ΔH is negative (exothermic).
2. A(l) + B(l) → C(l) + D(s), ΔH > 0.
3. A(s) + B(l) → 2C(l), ΔH < 0.
4. 2A(s) - B(s) → C(l), ΔH > 0.

Based on the given reactions and their respective AH values, the predicted spontaneity at different temperatures are as follows:
- 2A(g) 3B(g) → C(g) D(1) AHCOV: This reaction is predicted to be spontaneous at all temperatures.
- A(1) B(l) —— C(I) D(s) AH > 0: This reaction is not spontaneous at any temperature.
- Als) B(I) — 2C(I) AH < 0: This reaction is predicted to be spontaneous at low temperatures.
- 2A(s) - B(s) C(I) ΔΗ > Ο: This reaction is not spontaneous, as the enthalpy change is positive.
It is important to note that these predictions are based on thermodynamic calculations and do not take into account any kinetic factors that may affect the actual rate of the reaction.
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The valence states provided are general representations and may vary depending on specific conditions and coordination environments.

a. Uvarovite: The mineral formula for uvarovite is Ca3Cr2(SiO4)3. In this formula, the valence state of calcium (Ca) is +2, the valence state of chromium (Cr) is +3, and the valence state of silicon (Si) is +4. Oxygen (O) is usually assigned a valence state of -2.

b. Azurite: The mineral formula for azurite is Cu3(CO3)2(OH)2. In this formula, the valence state of copper (Cu) is +2, carbonate (CO3) has a valence state of -2, and hydroxide (OH) has a valence state of -1.

c. Cuprite: The mineral formula for cuprite is Cu2O. In this formula, the valence state of copper (Cu) is +1, and oxygen (O) is usually assigned a valence state of -2.

d. Gypsum: The mineral formula for gypsum is CaSO4·2H2O. In this formula, the valence state of calcium (Ca) is +2, sulfur (S) has a valence state of +6, and oxygen (O) is usually assigned a valence state of -2. The water molecules (H2O) do not have a net charge.

e. Galena: The mineral formula for galena is PbS. In this formula, the valence state of lead (Pb) is +2, and sulfur (S) has a valence state of -2.

It's important to note that the valence states provided are general representations and may vary depending on specific conditions and coordination environments.

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Answer:

Explanation:

There are 36 inches in a yard. Therefore, to convert inches to yards, you need to divide the number of inches by 36.

To convert 124.3 inches to yards using dimensional analysis, you can set up the following fraction:

124.3 inches x (1 yard / 36 inches)

Notice that we set up this fraction so that the inches units cancel out, leaving us with the desired yards unit.

Simplifying the fraction, we get:

124.3 inches x (1 / 36) yards

which gives:

3.452777777777778 yards

Rounding to two decimal places, we get:

3.45 yards

So there are approximately 3.45 yards in 124.3 inches.

Answer:

C

Explanation:

The solvent in the solution is H2O.

In this solution, H2O serves as the solvent. The solvent is the component in a solution that dissolves the solute, forming a homogeneous mixture. In this case, 100 g of H2O acts as the medium in which the solute, 2 g of KCl, is dissolved. The solvent determines the physical state of the solution and provides the medium for the solute particles to disperse.

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The number of mole of copper present in the copper sample shown in the diagram is 1.5 mole (option A)

We can obtain the number of mole of copper present in sample as follow:

Mole is defined as:

Mole = mass / molar mass

Inputting the mass and molar mass of copper, we have:

Mole of copper = 95.33 / 63.55

Mole of Copper = 1.5 mole

Thus, we can conclude that the number of mole of copper is 1.5 mole (option A)

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Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the correct option is option B.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. In the given phase diagram, region C represents gas phase.

Therefore, the correct option is option B.

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Answer: A. Liquid

Explanation:

Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of 12.

In the field of chemistry, atomic number can be described as the number of protons that is present in the nucleus of an atom.

The atomic number of Beryllium is 4 as it has 4 protons in its nucleus.

The second member of the group 2 elements in the periodic table is Magnesium. Magnesium has an atomic number of 12 because it has 12 protons in its nucleus.

The atomic number is represented by the letter Z usually. The atomic number is usually mentioned in a periodic table at the top-left.

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The pH of a solution is a measure of its acidity or alkalinity. The pH scale ranges from 0 to 14, with 0 being highly acidic, 7 being neutral, and 14 being highly alkaline. Acetate buffer is a solution that can resist changes in pH when small amounts of acid or base are added to it. Thus, the pH of distilled water can easily be changed by adding even small amounts of acid or base.

The pH of a solution is a measure of its acidity or alkalinity. The pH scale ranges from 0 to 14, with 0 being highly acidic, 7 being neutral, and 14 being highly alkaline. Acetate buffer is a solution that can resist changes in pH when small amounts of acid or base are added to it.

When NaOH or HCl is added to an acetate buffer, the pH of the solution changes only slightly because the acetate ions in the buffer solution react with the added acid or base, thereby maintaining a relatively constant pH.
On the other hand, when NaOH or HCl is added to distilled water, the pH of the solution changes dramatically because there are no buffering agents to resist the change.

When HCl is added to water, it increases the concentration of hydrogen ions (H+) in the solution, making it more acidic, and when NaOH is added to water, it increases the concentration of hydroxide ions (OH-) in the solution, making it more alkaline.

Thus, the pH of distilled water can easily be changed by adding even small amounts of acid or base.
In summary, the pH of an acetate buffer solution is relatively stable even when NaOH or HCl is added to it, while the pH of distilled water can be easily changed by adding small amounts of acid or base.

This is because buffering agents in the acetate buffer solution can resist changes in pH, while distilled water lacks such buffering agents.

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\(\\ \sf\longmapsto FeSO_4(NH_4)_2SO_4.6H_2O\)

\(\\ \sf\longmapsto 56u+32u+4(16u)+2(14u+4\times 1u)+32u+4(16u)+2(1u)+2(16u)\)

\(\\ \sf\longmapsto 120u+64u+56u+64u+2u+32u\)

\(\\ \sf\longmapsto 120u+120u+98u\)

\(\\ \sf\longmapsto 240u+98u\)

\(\\ \sf\longmapsto 342u\)

Answer:

\(\huge\mathfrak\green{hola}\)

Answer:

D. NO2

Explanation:

D. NO₂ is a polyatomic compound. It is made up of two non-metal atoms (nitrogen and oxygen) that are covalently bonded together and exist as a single, charged entity.

Explanation:

just trying...hope that helps

Answer:

standard carbon atom

Explanation:

Answer:

Explanation:

This is an isotope of carbon, more specifically, carbon-14. Carbon 14 has 6 protons, making the element carbon, and eight neutrons since 14-6 = 8.

Answer:selenium

Explanation:

Answer: Nether

Explanation: Because if you have one pound of Calcium and one pound of selenium there both the same weight  

Answer: 1.6 L

Explanation:

The new volume of the oxygen would be 0.16L when the pressure is increased to 25.00 atm.

The given problem can be solved using Boyle's law which states that when temperature and no. of moles of gas are constant the pressure is inversely proportional to volume.

let P1 = initial pressure

    V1 = initial volume

and P2 = final pressure

      V2 = final volume

Then from Boyle's law

P1V1=P2V2

V2=(P1V1)/P2

V2=(1.00atm*4.0L)/25.00atm

V2=0.16L

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The pressure of a gas is the force that a gas exerts per unit area of the container.

Pressure is defined as force per unit area. Gas molecules are constantly colliding against the walls of the container. The pressure of the gas is the force the gas is exerting on its container.

Since temperature is defined as the average kinetic energy of the molecules of a gas then the higher the temperature, the faster the particles move.

The volume of a container refers the size if the container.

The pressure of a gas is inversely proportional to its volume according to Boyle's law. Thus implies that if the pressure of the gas goes up, the volume has to go down.

For a compound to be called an acid, it must contain H+ and H3O+ when dissolved in water.

For a compound to be called a base, the compound must dissolve in water to yield hydroxide ions.

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Answer:

\(\boxed {\boxed {\sf 3. \ GAGCTC}}\)

Explanation:

Amino acids are the monomers or building blocks of protein. Proteins are created during protein synthesis according to the genetic information or DNA in an organism.

The DNA is translated to messenger RNA in the nucleus. It travels to the ribosome. There, the mRNA is "read off" in threes. Three nucleotides make up  a codon. Transfer RNA with the corresponding anticodon and an amino acid attaches to the codon and a chain of amino acid forms.

If 3 nucleotides make 1 codon which makes 1 amino acid, then we need double that or 6 nucleotides to make 2 amino acids.

The only answer choice with 6 nucleotides is Choice 3: GAGCTC

The mass of "Be (beryllium-7) in the reaction 1²H +³ He → "Be is approximately 7.0154 atomic mass units (u).

To find the mass of "Be (Beryllium-7) in the reaction 1²H +³ He → "Be, we can use the Q value of the reaction and the known masses of the isotopes involved.

It can be calculated using the equation;

Q = (m_initial - m_final) × c²

Where;

Q = Q value of the reaction

m_initial = total initial mass of the reactants

m_final = total final mass of the products

c = speed of light

In this case, the Q value for the reaction 1²H +³ He → "Be is given as 559.5 ± 0.4 keV.

Now, we need to determine the masses of the isotopes involved;

Mass of 1²H (deuterium) = 2.014102 u (atomic mass units)

Mass of ³ He (helium-3) = 3.016029 u

Mass of "Be (beryllium-7) = ?

Let's denote the mass of "Be as m_"Be.

Using the equation for the Q value, we can rearrange it to solve for the mass of "Beryllium

m_"Be = (Q/c²) + m_initial - m_final

m_"Be = (559.5 keV / (2.998 × 10⁸ m/s)²) + (2.014102 u + 3.016029 u) - m_"Be

Simplifying the equation, we have;

m_"Be = (559.5 × 10³ eV) / (8.98755 × 10¹⁶ m²/s²) + 5.030131 u - m_"Be

Rearranging the equation and solving for m_"Be:

2m_"Be = (559.5 × 10³ eV) / (8.98755 × 10¹⁶ m²/s²) + 5.030131 u

m_"Be = [(559.5 × 10³ eV) / (8.98755 × 10¹⁶ m²/s²) + 5.030131 u] / 2

Calculating the expression in the brackets:

m_"Be ≈ 7.0154 u

Therefore, the mass of "Be (beryllium-7) in the reaction 1²H +³ He → "Be is approximately 7.0154 atomic mass units (u).

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--The given question is incorrect, the correct question is

"B decay. Find several examples to verify your derived relationship. 6. The Q value for the reaction "Be (p. d) Be is 559.5 ± 0.4 keV. Use this value along with the accurately known masses of "Be. H. and ¹H to find the mass of "Be. 1²H +³ He."--

Answer:

because of heat and pressure

Answer:

the answers is 1.204×10/23

Explanation:

idek

According to Avogadro's number, there are 1.204 × 10²³ atoms in 39.39 g of gold.

To determine the number of atoms in 39.39 g of gold, we need to use the Avogadro's number, which is equal to 6.022 × 10²³ atoms/mol.

First,  need to convert the given mass from grams to moles by dividing it by the molar mass of gold, which is 196.967 g/mol.

\(\dfrac{39.39}{196.96}\\=0.19999\) moles

Now, we can use Avogadro's number to find the number of atoms:

\(0.19999\times6.023\tims10^2^3\\=1.204\times10^2^3\)

Therefore, the prospector has 1.204 × 10²³ atoms of gold.

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Answer: 3.31 × \(10^{24\) molecules

Explanation: To go from moles to molecules, multiply the number of moles by 6.022 x 10^23. 

No, the volume of water in a beaker is not an extensive property.

Extensive properties are those that depend on the amount or size of the substance being measured. In other words, they are properties that change with the quantity of the substance. Examples of extensive properties include mass, volume, and total energy.

In the given scenario, the volume of water in the beaker is 50 milliliters. This volume remains the same regardless of the quantity of water present. Whether it's 50 milliliters or 500 milliliters, the volume measurement does not change. Therefore, the volume of water in the beaker is an example of an intensive property.

Intensive properties are independent of the amount or size of the substance. They are characteristics that remain constant regardless of the quantity of the substance. Examples of intensive properties include temperature, density, and color.

It's important to note that the distinction between extensive and intensive properties depends on the specific property being considered. While volume is typically an extensive property for a bulk substance, in the case of a fixed volume of water in a beaker, it becomes an intensive property.

In summary, the volume of water in a beaker is not an extensive property but rather an intensive property because it does not change with the quantity of the substance.

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Answer:

Oxygen

Explanation:

From the periodic table, you can see that the atomic mass of Oxygen is 15.999 (16), however, Carbon's mass is 12.011 (12).

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The complete, balanced reaction for H2CO3(aq) + 2NaOH(aq) is:

H2CO3(aq) + 2NaOH(aq) → Na2CO3(aq) + 2H2O(l)

Ionic equation:

H2CO3(aq) + 2Na+(aq) + 2OH-(aq) → Na2CO3(aq) + 2H2O(l)

Net ionic equation:

H2CO3(aq) + 2OH-(aq) → CO32-(aq) + 2H2O(l)

In the net ionic equation, the spectator ion Na+ is not included as it does not participate in the reaction.

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