what mass (in g) of oxygen must be added to 8.22 g of neon at 24.5oc, and in a 100 l contain for a final pressure of 848 mmhg?

Answer: (i) C2H2 = Ethyne , (ii) C2H4 = Ethylene , (iii) C2H6 = Ethane

Explanation:

Ethyne, also known as Acetylene is an organic chemical compound with chemical formula C2H2. The Ethyne molecule features a tripple bond between two carbon atoms, each of which is single bonded to one another hydrogen atom.

Ethylene is an unsaturated organic compound with the chemical formula C2H4. It has one double bond  between carbon atoms and is the simplest member of the alkene class of hydrocarbon.

Ethane is a saturated hydrocarbon found in gaseous state with chemical formula C2H6. It has single bond  between carbon atoms and contains two carbon atomsand six hydrogen atoms

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Explanation:

The electronic configuration of Selenium(Se) is 1s22s22p63s23p63d104s24p4 we remove electron .the electron configuration is1s22s22p63s23p63d104s24p4

the correct anwser is C

The electron configuration for Selenium is: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴.

Therefore, option c is correct.

The electronic configuration of an element is the filling of electron from lower energy level to the higher energy level. This is according to the Aufbau's principle.

Selenium has 34 electrons. The electronic configuration of Selenium can be determined by filling the electrons in increasing order of energy levels and sub-levels.

The electronic configuration of Selenium can be written as:

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴

Here, 4s is more energetic than 3d and thus occupies first.

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Molarity= No of moles of solute * 1000 / vol solution in ml

No of moles= Given mass / Molar mass

Given Mass of solute (H2O2)= 10g

Molar mass of H2O2=34gmol^-1

No of moles= 10/34= 0.294 moles

Volume of solution=50ml

Molarity =   0.294*1000 / 50

Molarity = 5.8M

Explanation:

Density is equal to mass divided by volume:

ρ = m / V

The equation can also be rearranged according to mass and volume:

m = ρ * V

V = m / ρ

To find out which crown is made of gold, you need to compare the densities after the calculation. Gold has a density of ρ = 19,32 g/cm³.

The mass of an element released during electrolysis is inversely proportional to the amount of electricity flowing through the electrolyte, according to the first law.

Mathematically, this can be expressed as: deposited mass, current, I, and time, t, or deposited mass, It. Where Q=Charge, M=Molarmass, n=nfac. A) M=Qm/Fn, the mass (m) of a substance deposited on the cathode or anode during electrolysis is given. Silver atoms are added to the cathode and subtracted from the anode for each element that circles the external circuit. This indicates that the mass obtained by the cathode is equal to the mass lost by the anode (assuming the silver anode is pure; see below).

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Answer:

D. The sum of the voltages of the half reactions is positive.

Explanation:

It's correct on apeex

The statement, that describes the redox conditions will produce a spontaneous reaction is "the sum of the voltages of the half-reactions is positive."

A spontaneous reaction is one that favors the creation of products under the conditions of the reaction. It can move in a specific direction without being propelled by an external source of energy. If the standard electrode potential for the redox reaction is positive, the reaction is spontaneous.

If \(E^{0}\) (redox reaction) is positive, the reaction will move onward (spontaneous). The redox conditions will cause a spontaneous reaction, and the sum of the half-reaction voltages is positive. Hence the correct option is D.

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Answer:

A leaf needs carbon dioxide and water for photosynthesis. ... For carbon dioxide to enter, the stomata on the surface of the leaf must be open. As you have seen, transpiration draws water from the roots into the leaf mesophyll.

I hope this helps you :)

Dmitri Mendeleev made significant contributions to scientists' understanding of the elements through his development of the periodic table.

Periodic Law: Mendeleev observed that when the elements were arranged in order of increasing atomic mass, their properties exhibited a periodic pattern. This led to the formulation of the Periodic Law, which states that the properties of elements are a periodic function of their atomic number. This fundamental principle laid the foundation for understanding the relationships and trends among the elements.

Organization of Elements: Mendeleev organized the known elements into a tabular form, creating the first widely recognized periodic table. He arranged the elements based on their atomic mass and grouped them according to their chemical and physical properties. This arrangement allowed scientists to see patterns and similarities among elements and make predictions about the properties of undiscovered elements.

Predictive Power: One of Mendeleev's remarkable achievements was his ability to predict the existence and properties of elements that were yet to be discovered. Gaps in his periodic table led him to propose the existence of elements that were later found and confirmed, such as gallium, scandium, and germanium. These successful predictions demonstrated the usefulness of the periodic table as a tool for organizing and predicting the properties of elements.

Revision and Expansion: Over time, Mendeleev's periodic table has been revised and expanded based on new discoveries and advancements in atomic theory. However, his original framework provided the basis for subsequent refinements, including the arrangement of elements by atomic number rather than atomic mass.

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The equilibrium equation for the salt AB can be represented as;AB ⇌ a^+ + b^-Ksp= [a^+] [b^-]The solubility product for the salt AB.

Ksp is given by the product of the molar concentration of the two ions raised to their respective powers. For the given equilibrium, the concentration of b^- is 8.3 × 10^-7 M, then the solubility product can be calculated by substituting the concentration of b^- into the equilibrium equation.Ksp = [a^+] [8.3 × 10^-7].Hence, the solubility product for the salt AB can be determined by multiplying the concentration of the ions raised to their respective powers. In this case, the concentration of b^- is 8.3 × 10^-7 M, then the solubility product can be calculated by substituting the concentration of b^- into the equilibrium equation.

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Heat will flow from the system to its surroundings if the reaction emits energy. When heat is emitted from the system into the environment, a chemical reaction is exothermic.

The basis for various sorts of chemical reaction includes the product created, changes that take place, reactants involved, and more. A chemical reaction is the transformation of one or more chemicals, known as reactants, into one or more new compounds, known as products. Chemical components or compounds make up substances.

When the overall standard enthalpy change (H) is negative, a reaction is said to be exothermic. Typically, exothermic reactions produce heat. Exergonic reaction and the phrase are frequently confused.

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Answer:

1. Chlorine 2. Bromine 3. Iodine

Explanation:

Answer:

Bromine: 2 Chlorine: 1 Iodine: 3

Explanation:

29.25 grams of NaCl, m.w. 58.5 daltons, are necessary to make 1 liter of 5% saline.

Molar concentration is a unit of measurement for the concentration of a chemical species, specifically a solute, in a solution, expressed as the amount of substance per unit volume of solution. The most often used unit for molarity in chemistry is the number of moles per litre, denoted by the unit symbol mol/L or mol/dm3 in SI units.

A solution's concentration is defined as the quantity of solute present in a given amount of solution. The concentration of any solution is defined as the solute divided by the volume of the solvent or solution. When represented as a percentage, it is known as mass by volume percent.

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The surface area of the pyramid is 96 ft², the surface area of the square base prism is 552 ft², the surface area of the cube is 216 ft², the total surface area is 756 ft²

The surface area of the pyramid = A + 1/2 pl

Where,

A = base area

p = perimeter

l = slant height

Therefore,

A = 6² = 36 ft²

l = 4(6) = 24 ft

l = √3² + 4² = √9 + 16 = √25 = 5 ft

The surface area of the pyramid = 36 + 1 / 2 × 24 × 5 = 96 ft²

The surface area of the square base prism = 2a² + 4ah

The surface area of the square base prism = 2(6)² + 4(6)(20) = 72 + 480 = 552 ft²

The surface area of the cube  = 6l² = 6 × 6² = 6 × 36 = 216 ft²

Total surface area = 96 + 552 + 216 = 864 - 36  - 36 - 36 = 756 ft²

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Answer: B: Polarity

Explanation:

Answer:

\(\boxed {\boxed {\sf V_2=75 \ mL}}\)

Explanation:

Since the pressure is constant, the only variables we need to work with are temperature and volume. We will use Charles's Law, which states the volume of a gas is directly proportional to the temperature. The formula is:

\(\frac{V_1}{T_1}=\frac{V_2}{T_2}\)

Originally, the gas was 50 milliliters at 20 degrees celsius. Substitute these values into the left side of the equation.

\(\frac{50 \ mL}{20 \textdegree C}=\frac{ V_2}{T_2}\)

We don't know the volume of the new gas, but we know the temperature was changed to 30 degrees celsius.

\(\frac{50 \ mL}{20 \textdegree C}=\frac{ V_2}{30 \textdegree C}\)

Since we are solving for the new volume, we must isolate the variable. It is being divided by 30 °Cand the inverse of division is muliplication. Multiply both sides by 30 °C.

\(30 \textdegree C*\frac{50 \ mL}{20 \textdegree C}=\frac{ V_2}{30 \textdegree C}* 30 \textdegree C\)

\(30 \textdegree C*\frac{50 \ mL}{20 \textdegree C}= V_2\)

The units of degrees celsius cancel, so we are left with milliliters as the units.

\(30*\frac{50 \ mL}{20}= V_2\)

\(\frac{1500 \ mL}{20}= V_2\)

\(75 \ mL=V_2\)

The new volume of the gas is 75 milliliters.

The other is the placement of hydrophobic amino acid residues within the interior of the protein.

What are hydrophobic amino acid?

Amino acid hydrophobicity is often defined by its partitioning between two liquid phases and this property can be important in downstream processing.

Amino acids are grouped according to what their side chains are like.

Glycine (Gly), alanine (Ala), valine (Val), leucine (Leu), isoleucine (Ile), proline (Pro), phenylalanine (Phe), methionine (Met), and tryptophan (Trp) have hydrophobic side chains.

These side chains are composed mostly of carbon and hydrogen, have very small dipole moments, and tend to be repelled from water.

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Answer:

Compound

Explanation:

It has a definite composition throughout and can be made of more than one type of element.

The acceleration of the car : 2.5 m/s²

Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object  

∑F = m. a  

Mass of the car = 1200 kg

Forward force = 3400 N

Friction force = 400 N

The direction of motion of the friction force will be opposite to the forward force, so that both of them can be subtracted to get the value of the net force (net force: combination / sum of all forces acting on an object)

\(\tt \sum F=3400-400=3000~N\)

So the acceleration :

\(\tt a=\dfrac{\sum F}{m}\\\\a=\dfrac{3000}{1200}\\\\a=2.5~m/s^2\)

Answer:

False

Explanation:

From what I know about water and gas, this is false

The relative molecular mass of the compound is 45.8

The relative molecular mass of anisotope can be obtained by using the formula below:

Relative molecular mass = [(Mass of A × Abundance of A)/100] + [(Mass of B × Abundance of B)/100]

Where

The relative molecular mass can be obtained as illustrated below:

Relative molecular mass = [(Mass of A × Abundance of A)/100] + [(Mass of B × Abundance of B)/100]

Relative molecular mass = [(45 × 60)/100] + [(47× 40)/100]

Relative molecular mass = 27 + 18.8

Relative molecular mass = 45.8

Thus, the relative molecular mass is 45.8

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The mass of water is approximately 76.0 g.

First, we need to calculate the heat transferred (q) from the reaction between 2.25 mol of X and water:

ΔHrxn = q / n

where ΔHrxn is the heat of reaction, q is the heat transferred, and n is the number of moles of X.

Assuming the reaction is endothermic (absorbs heat), ΔHrxn will be positive. We can use the following equation to calculate ΔHrxn:

ΔHrxn = (2.25 mol X) * ΔHf

where ΔHf is the molar heat of fusion of X.

Now, we can substitute the given values into the equation for q:

q = ΔHrxn = (2.25 mol X) * ΔHf

Next, we can use the equation for q to solve for the mass of water (m):

m = q / (c * ΔT)

where c is the specific heat capacity of water, which is 4.184 J/g-K.

Substituting the given values, we get:

m = (2.25 mol X * ΔHf) / (4.184 J/g-K * (27.5 - 20.0) K)

Simplifying and converting to grams:

m = 2.25 mol X * ΔHf / 29.568 J/g = 76.001 g.

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Answer:

eon,era, period

Explanation:

Answer:

period<era<eon

Explanation:

I took the test, sadly got a 70%.

First of all, Z is unknown. I hope it is a mistake.

        Now, it is given that the element X has nineteen electrons. This proves that X is actually Potassium.

        As per the periodic table, both Potassium and Lithium belongs to group 1 as their valency is 1 because of the presence of only one electron in the outermost shell of electrons i.e., they lose an electron during a chemical reaction to form a stable compound. Furthermore, both are metallic.

        Magnesium belongs to group 2 and hence its valency is two, which is different from potassium though it is metallic. Similiarly, bromine belongs to group 17 and gains one electron during a reaction in contrast to potassium.

( No internal links available for reference. For clarification, check the periodic table).

Water molecules are held together by hydrogen bonds because they are polar covalent bond molecules.

The smallest particle of a substance has all the physical and chemical properties of that substance. A molecule is made up of one or more atoms. If they contain multiple atoms, those atoms can be the same (the oxygen molecule has two oxygen atoms) or different (the water molecule has two hydrogen atoms and one oxygen atom). Biomolecules such as proteins and DNA are made up of thousands of atoms.

A simple molecule contains only a few atoms joined by covalent bonds. An example is carbon dioxide (CO 2 ), whose molecule contains a carbon atom bonded to two oxygen atoms.

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