a volume of 2 dm³ of nitrogen and 1 dm³ of oxygen, both at a pressure of 101.3 kPa, are put into a container with a volume of 3 dm³. What is the partial pressure of each gas in the mixture?

Answer:

1 ) Zinc

2 ) Oxygen

3 ) Rubidium

Explanation:

Zinc ( Zn )  -  r = 140 pm

Oxygen ( O )  -  r = 152 pm

Rubidium ( Rb )  -   r = 303 pm

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The pressure 0.75 atm to mmHg is 570 mmHg. Option C.

Since most barometers use mercury as the liquid the height of the liquid is often used as a measure of pressure. Therefore, millimeters of mercury or centimeters of mercury are sometimes used as units of pressure. KPa is an abbreviation for kilopascal, which is the pressure applied to a surface.

Calculation:-

1 atm = 760 MM of Hg

0.75 atm = 0.75 × 760

= 570 MM of Hg

KPa is widely used internationally as a unit of pressure and is also used for example to measure air pressure in car tires. The three methods of measuring pressure are absolute, gage and differential. Absolute pressure refers to the pressure in a vacuum while gauge pressure and differential pressure refer to other pressures such as the ambient atmospheric pressure or the pressure of an adjacent vessel.

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The percent purity of strontium hydroxide in the mass of the given sample is 74.7%.

The percent purity of a substance is the ratio of the actual amount of a substance present in a sample and the ratio of the whole amount of the sample.

Equation of reaction: Sr(OH)₂ + 2 HCl ---> SrCl₂ + 2 H₂O

The mass of the pure strontium hydroxide is calculated as follows:

moles of initial HCl sample = 0.1010 * 120 mL * 1 L / 1000 mL

moles of initial HCl sample = 0.01212 moles

Moles of HCl that reacted with NaOH = 0.1020 * 36.6 * 1 L / 1000 mL

Moles of HCl that reacted with NaOH = 0.00373 moles

moles of HCl that reacted with strontium hydroxide = 0.01212 - 0.00373

moles of HCl that reacted with strontium hydroxide  = 0.00839 moles

Moles of strontium hydroxide that reacted with HCl = 0.00839/2 moles

Mass of strontium hydroxide that reacted with HCl = 0.00839/2 moles * 121.63 g/mol

Mass of strontium hydroxide that reacted with HCl = 0.510 g

Percent purity = 0.510/0.683 * 100 %

Percent purity = 74.7%

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Taking into account the definition of pH and pOH, for 8.68×10⁻³ M LiOH, the [OH⁻] is 8.68×10⁻³ M and the [H₃O⁺] is 1.148×10⁻¹² M.

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pOH + pH= 14

A strong base is a base that completely dissociates in aqueous solution. That is, in the ionization process they are completely transformed into cations or positive ions and into anions or negative ions, all concentrations being equal.

LiOH is a strong base, so [LiOH]=[OH⁻]= 8.68×10⁻³ M

Replacing in the definition of pOH:

pOH= - log 8.68×10⁻³ M

Solving

pOH= 2.06

So, pH is calculated as:

pH + 2.06= 14

pH= 14 - 2.06

pH= 11.94

Replacing this value in the definition of the pH:

- log [H₃O⁺]= 11.94

Solving:

[H₃O⁺]= [tex]10^{-11.94}[/tex]

[H₃O⁺]= 1.148×10⁻¹² M

In summary, the [OH⁻] is 8.68×10⁻³ M and the [H₃O⁺] is 1.148×10⁻¹² M.

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Answer:

The balanced chemical equation is:

Mg_((s))+ 2HCl_((aq))rarrMgCl_(2(aq)) + H_(2(g)

Explanation:

The reaction between magnesium and hydrochloric acid combine to form a salt of magnesium chloride and release hydrogen gas. This single replacement reaction is a classic example of a metal reacting in an acid to release hydrogen gas.

Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Therefore, to become P³⁻,  phosphorous has to gain 3 electrons in its p orbital.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.

Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.

The electronic configuration of phosphorous is Ne 3s² 3p³. To become P³⁻. Phosphorous has to gain 3 electrons in its p orbital.

Therefore, to become P³⁻,  phosphorous has to gain 3 electrons in its p orbital.

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Catalase best describes an enzyme that catalyzes a reaction involving the reduction of hydrogen peroxide with the oxidation of the second molecule of hydrogen peroxide.

Catalase is a common enzyme determined in almost all dwelling organisms exposed to oxygen (consisting of microorganisms, vegetation, and animals) which catalyzes the decomposition of hydrogen peroxide to water and oxygen. it's by far a totally crucial enzyme in defending the cell from oxidative damage by reactive oxygen species (ROS).

An enzyme is an organic catalyst and is sort of usually a protein. It quickens the fee of a selected chemical reaction within the cellular. The enzyme isn't destroyed at some stage in the reaction and is used again and again. Enzymes are categorized into six classes consistent with the form of reaction catalyzed: Oxidoreductases, transferases, hydrolases, lyases, ligases, and isomerases.

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The volume of the KOH required to neutralize 40.0 mL of a 0.035 M H2sO4 solution is 0.0215 L.

Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.

Given

V1 =?

C₁ = 0.65 M

C₂ = 0.035 M

n -2

V2 = 40 ml  = 0.04 L

C₁V₁ = C₂V₂

V₁ = C₂V₂/ C₁

    =   0.035 * 0.04 / 0.065

    =  0.0215 L

The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.

The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.

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The appropriate values for A and Z and the chemical symbol for X in the alpha decay of protactinium-231 is

Alpha decay is a radioactive decay by emitting an alpha particle, which is a positively charged nucleus of a helium-4 atom (consisting of two protons and two neutrons), emitted as a consequence of radioactivity.

Alpha has a symbol of α-particle. According to this question, protactinium-231 undergoes alpha decay, which means that it will lose 4 in its mass number and 2 in its atomic number.

231 - 4 = 227

91 - 2 = 89

The element that will be formed from the alpha decay will have a mass number of 227 and an atomic number of 89.

The element with an atomic number of 89 is actinium with chemical symbol Ac.

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About 21 protein grams were in him. Pablo's third breakfast dish was a scrambled egg.

Protein makes up the majority of the body's organs, tissues, and body parts, include muscle, bones, skin, and hair. It contributes to the production of hemoglobin, which transports oxygen in the blood, and enzymes, which drive numerous chemical reactions.

Your muscles' primary building material is protein. Therefore, consuming enough protein will help you keep your lean muscle and encourage muscular growth when you engage in strength exercise. Eating a lot of protein can help build muscle mass and strength, according to numerous studies.

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For reflex action the motor neuron that generates the reflex action and pass to the sensory neuron. Interneuron helps to sensory neuron to communicate with motor neurons. Thus in this picture motor neuron be the interneuron and interneuron be the motor neuron. Thus option A and D are correct.

Reflex action is generated by our body by the sudden action to for sense of touch or other stimulants. For example, if touch a very hot body, we will take our hand within second and this is resulted by the action of neuron and is called the reflex action.

The movement of hands and legs are controlled by the motor neurons. If we touch any stimulant sensory neurons pass signals to the motor neuron and a signal containing the information of action is returned to the sensory neurons of our hand.

Here, the communication between sensory neuron and motor neuron is facilitated by interneurons. motor neuron be the interneuron and interneuron be the motor neuron. Thus option A and D are correct..

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From the values of bond enthalpy shown, the enthalpy of the reaction is  -263 kJ/mol.

We know that the enthalpy of the reaction has to do with the energy that has been lost or gained in the reaction. We know that in the course of a chemical reaction, thee is the breaking and the forming of bonds.

Looking at the reaction, we know that the enthalpy of the reaction is to be obtained as the difference between the total bond energies of the products and the total bond energies of the reactants.

The bond energies present are;

C=C  - 598 kJ/mol

C-C - 346 kJ/mol

C -H - 416 kJ/mol

H -Br - 366 kJ/mol

C - Br - 285 kJ/mol

Then we have;

[1(346) + 5(416) + 1(285)] - [1( 598) + 4(416) + 1(346) + 1( 366)]

[346 + 2080 + 285] - [598 + 1664 + 346 + 366]

2711 - 2974

= -263 kJ/mol

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Variations in the concentration of the cyclin-type molecule control how quickly the cell cycle advances. It takes a lot of regulation to move a cell cycle forward.

To ensure that division and proliferation are the desired results, a variety of checks and balances are employed. cell cycle -dependent kinases (CDKs) and their partner cell cycle are responsible for facilitating progression. 84,85 Each pair corresponds to a specific cell cycle stage.

Cyclins fall into two primary categories: G1/S cyclins are crucial for maintaining cell cycle regulation at the G1/S transition, and Cyclin A/CDK2 is active in S phase. The modulation of the cell cycle at the G2/M transition depends on G2/M cyclins (mitosis).

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I₂ is the halogens which is darkest in colour than other.

Halogens are the elements which belongs to group 17. Group 17 elements are known as halogens. They are highly electronegative in nature.

The last electronic configuration is ns2 np5. Since, one electron is less to get stable electronic configuration. Therefore, they accept one electron and get stable electronic configuration.

As we move down the group, the darkness of colour increases. This is due to ionization energy which decreases as we move down the group. This is due to increase in the atomic size and decrease in nuclear form which further make high energy level to absorb lesser light and reflects deepen colour on moving down the group. Due to which they appears dark. Therefore, option A is the correct option.

Thus, we can concluded that I₂ is the halogens which is darkest in colour than other.

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The burette is filled with 0.3000 M NaOH. The beaker has 25.00 mL of 0.3000 M HCl.volume of 0.3000 M NaOH was required by the titration to reach the equivalence point is 25 mL.

The equivalence point is the point where mole of each solution are equal to each other.The chemical equation is given as :

NaOH +   HCl   ---->   NaCl    +  H₂O

The molarity expression is given as :

molarity = moles / volume

moles = molarity × volume

moles = 0.300 × 0.025

moles = 0.0075 mol

number of moles of HCl = number of moles of NaOH

moles of NaOH = 0.0075 mol

volume of NaOH = moles / molarity

                            = 0.0075 / 0.300

                            = 0.25 L = 25 mL

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Answer: 2.06%

Explanation:

The chemical formula for sulfuric acid is H₂SO₄.

Find the molar mass of the whole compound:

2(1.01) + 32.07 + 4(16) = 98.02 g/mol

The percent composition by mass of hydrogen can be calculated as:

[tex]\frac{2.02}{98.02}*100=0.0206*100=2.06[/tex]

The kinetic energy of the oxygen gas under the same condition is the same as that of helium.

We know that the kinetic energy of a gas depends on the temperature of the molecules of the gas. Temperature is the measure of the average kinetic energy of the molecules of the gas.

When we know that we have two gases, what would determine the average kinetic energy of the molecules of the gas would only be the temperature of the gas. Thus irrespective of the molar masses of the gases, they would have the same kinetic energy at the same temperature.

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The mass of the gold bar is 9700 g.

Density is the substance's mass in line with a unit of volume. The image most often used for density is ρ, although the Latin letter D also can be used. Mathematically, density is described as mass divided with the aid of volume.

Density is the dimension of the way tightly a cloth is packed together. it is defined as the mass per unit volume. Density symbol D or ρ Density components ρ = m/V, where ρ is the density, m is the mass of the object and V is the quantity of the object. The density of a liquid is a measure of ways heavy it is for the amount measured. in case you weigh identical amounts or volumes of two distinctive beverages, the liquid that weighs more is dense.

Calculation:-

Given,

density = 19.4 g/cm

volume = 20 × 5 × 5

             = 500 cm³

Density = mass/volume

 mass = density × volume

          = 19.4 × 500 g

          = 9700 g

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The increasing effective nuclear charge is what causes the tendency towards smaller atomic radii as one advances to the right in a period.

Effective nuclear charge is the term for the positive charge that nuclear protons exhibit when they interact with valence electrons.. The effective nuclear charge is always less than the total number of protons in a nucleus because of the shielding effect.

The kind of electron determines the effective nuclear charge. Even electrons in 4s and 5s s orbitals spend some time near the nucleus, where they experience the full nuclear charge. As a result, on average, s electrons experience a nuclear charge that is closer to the true nuclear charge.

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Manganese, Mn, forms two ions, one with a 2+ charge and one with a 3+ charge.  the formula for manganese (II) sulfide is MnS.

The manganese atomic number is 25. the manganese is the metal . metal have tendency to donate valence electron. manganese donate 2 electrons and form Mn⁺². The sulfur atomic number is 16. sulfur is nonmetal and tendency to accept electrons. sulfur accepts electrons and form S²⁻. The manganese and sulfur thus combines and form ionic compound. the formula for ionic compound manganese(II)sulfide is  MnS

Thus, Manganese, Mn, forms two ions, one with a 2+ charge and one with a 3+ charge.  the formula for manganese (II) sulfide is MnS.

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According to the concept of solubility, isopropanol is miscible with water and hence there is one layer that is formed when water and isopropanol are  mixed.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Answer:

c 8id

Explanation:

The percent error of the student’s measurement is 98.48%

While doing any experiment or any calculation we usually calculate the estimated result or value that needs to come at the end of the reaction and that is called as theoretical value. But once the experiment is completed the value that we get is not the same as that of theoretical value and this value is called as the experimental value.

To understand the error that had happened during the experiment we find out the percent error and the formula for it is as follows

Percent error =  Experimental value     × 100

                          Theoretical value

When we use the same formula for the above given case we can see that  the expected measurement was supposed to be 32.9 but the student measure it to be 32.4 so the percent error here is

= 32.4  × 100 ⇒ 98.48%

   32.9

Hence the percent error in calculation is 98.48%

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Answer:

86

Explanation:

8 tens 7 ones 87

8 tens 5 ones 85

Right in the middle is 86

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Answer:

86

Explanation:

8 tens 7 ones 87

8 tens 5 ones 85

Right in the middle is 86

The percent by mass of the chromium is 32.1 %.

The term percent by mass has to do with the ratio of the mass of a particular component of the component to the total mass of the compound multiplied by hundred. Let us recall that a percent must involve hundred.

Now we have;

Mass of Cr = 16.05

Total mass of the sample = 50 g

We now have;

Mass of Cr/ Total mass * 100/1

= 16.05/50 g  * 100/1

= 32.1 %

Hence, from the total sample, we have about 32.1 % of chromium.

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It is not necessary to test the reactivity of the elemental metals with solutions of the same metal ion because it won't react with itself.

This is referred to as the relative capacity or how readily a substance undergoes a chemical reaction.

Reactivity of elements are dependent on various types of parameters such as the number of valence electrons, shells etc and can be tested with other substances. However, it can't be tested with the solutions of the same metal ion because no reaction will occur thereby making it the most correct reason in this scenario.

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Semiconductor materials with band gaps greater than 3.5 ev are considered to be insulators because of high band gap.

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Answer:

Science. Chemistry. Chemistry questions and answers. How many equivalents of Mg2+ are present in a solution that contains 2.65 moles of Mg2+ ? Express your answer using three …

Expert Answer. 100% (5 ratings) Number of equivalents of an ion …. View the full answer. Transcribed image text: Question 4 (0.5 points) How many equivalents of Mg2+ are present in …

how many equivalents of Mg2+ are present in a solution that contains 2.75 mol of Mg2+?

A:

5.50 eq

Explanation:

We can determine how different electron groups are arranged with the aid of electron geometry. On the other side, understanding molecular geometry aids in understanding the complete atom and its configuration.

The main distinction between a molecule's shape and geometry is that a molecule's shape refers to its structure, excluding the lone pair on its central atom, but a molecule's geometry specifies how its lone pair and bond pair electrons are arranged around its central atom.

The arrangement of the electron groups geometrically around the main atom is known as the electron geometry. The geometrical configuration of molecules is known as molecular geometry atoms surrounding the primary atoms.

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