Identify each statement as either true or false. Boiling and evaporation are identical processes [ Select ] Vaporization describes the transition from liquid to gas [ Select ] Evaporation can only occur when vapor pressure is equal to atmospheric pressure [ Select] Boiling can only occur when heat is added to a liquid [ Select]

3.12 mg of sample will remain after 39.9 hours if the half life of iodine is 13.3 hours.

Half life of the reaction is the time required for the reactant concentration to decrease to one-half its initial value. The half-life of a first order reaction is a constant that is related to the rate constant for the reaction.

here, Half life of iodine is 13.3 hours. so,

Half life t1/2 = ln 2/ K

                k = 0.693 / t1/2

                   = 0.693 /13.3 hours

                   = 5.21 *10-2

The rate of a reaction is dependent on rate constant which is different for each reaction type. A first-order reaction is a reaction where the rate is dependent on the concentration of only one reactant. Because of this, it is also called a unimolecular reaction. The rate equation for this type of reaction is: Rate constant for first order reaction is,

k= 1/t ln [A]0 / [A]t

t = 39.9 hours

k = 5.21 * 10-2 / hour

putting all the values in the expression of rate constant for first order reaction we get,

[A]t = 3.12mg

To learn more about Half life please visit:

https://brainly.com/question/1160651

#SPJ4

Methane (CH4) and oxygen (O2) are the reactants in this chemical process, whereas carbon dioxide (CO2) and water are the products (H2O). Because the oxidation number of the O2 molecule is zero, this process is both a combustion and a redox reaction.

An exothermic process occurs when carbon and oxygen combine to form carbon dioxide, which generates 394 kJ/mol of heat. Using the above information, a calculation can be used to demonstrate that the combustion reaction between methane and oxygen is exothermic. Reactants are the substance(s) in a chemical equation to the left of the arrow. A component that is present at the outset of a chemical reaction is known as a reactant. Products are the substance(s) to the right of the arrow.

To learn more about the exothermic process follow the below link:

https://brainly.com/question/13014923

#SPJ4

Baking is a chemical change when you bake a cake the ingredients go through a chemical change. .

Chemical Change is defined as the process in which the atoms of one or more substances are rearranged or combined to form a new substance. When a substance undergoes chemical change the chemical properties of the substance changes and it is transformed into a different substance with different chemical composition. Examples are burning of any substance, rusting of iron.

Therefore a chemical change occurs when the molecules that compose two or more substances are rearranged to form a new substance.

Learn more about chemical change here: brainly.com/question/1222323

#SPJ1

An alloy is a solution in which: Solid dissolved in a solid:

A material that combines more than one metal or blends a metal with other non-metallic components is known as a metal alloy. Brass, for instance, is an alloy of the two metals copper and zinc. A metallic element (iron) and a trace amount (up to 2%) of a non-metallic element are alloyed to form steel (carbon).

There are two different general types of alloys. A substitutional alloy is one form in which the different atoms simply swap places inside the crystal structure. The smaller atoms, like carbon, fit between the bigger atoms in the crystal packing arrangement in a different sort of alloy called an interstitial alloy.

Since Alloy is a homogeneous mixture of two or more metals ( solid ) or a metal and a non - metal ( solid ). So, alloy is a solution which consists of a solid dissolved in a solid, it is the correct option.

To know more about alloy refer to:

https://brainly.com/question/16935193

#SPJ1

They don't take up much room in the package so because target is so little. The target, which is quite small, stands in for the gold nuclei used in the Rutherford experiment.

The size of a container is 12 inches in length, 6 inches broad, & 5 inches tall. Size is the entire lot of physical area that a people or item occupies. What about size of a coin, the beetle. Equal in size are the twins.

Shape refers to appearance, figure, or what form something has, such as a triangle with three sides, a square with four equal sides, a rectangle with four sides, etc. Size is defined as a measurement or set of dimensions. Because the notebook is rectangular in shape, its size may be determined by its length and width.

To know more about size visit:

brainly.com/question/14006762

#SPJ4

From the percentage composition, the empirical formula of nicotine is C₅H₇N.

The mole ratio of the elements carbon, hydrogen, and nitrogen is 5 : 7 : 1

The empirical formula of a compound is the formula showing the elements combined in the simplest ratio.

The empirical formula of nicotine is calculated as follows:

Mole ratio of Carbon : 74%/12 = 0.06 moles

Mole ratio of Hydrogen : 8.7%/1 = 0.087 moles

Mole ratio of nitrogen : 17.3% / 14 = 0.012 moles

Simplest mole ratio:

Carbon: 0.06/0.012 = 5

Hydrogen: 0.087 / 0.012 = 7

Nitrogen : 0.012 / 0.012 = 1

The empirical formula of nicotine will be C₅H₇N

Learn more about empirical formula at: https://brainly.com/question/1603500

#SPJ1

The willingness—and occasionally the self-interest—of the agency's heads might make it difficult for them to cooperate and coordinate. Elected executive officeholders have a great deal of control over their personnel systems and have closely preserved this privilege.

In Texas, the governor's ability to manage the bureaucracy is constrained by three factors: (1) limited appointment, removal, and directive powers; (2) lack of a true executive budget; and (3) fragmentation of the executive. Important arguments in favor of decentralizing government include the fact that it fosters an effective and dependable administration, intensifies and enhances local development, better assures the local population's rights to an effective voice in politics, and better defends minorities.

To know more about appointments,

https://brainly.com/question/14617031

#SPJ4

Costs associated with product failures that occur after they have been sold to customers are known as external failure costs. These expenses cover the legal expenditures associated with customer lawsuits.

Liability claims. Warranty claims are regarded as a cost of external failure. It is a cost that the company incurs to replace and repair goods that customers have recently purchased.

One element of the cost of quality is external failure costs, which are incurred when a subpar product is delivered to the client and malfunctions while being used. The warranty work and returns make up the majority of this expense. However, customer lawsuits could also be a possibility.

To know more about external failure costs visit:-

https://brainly.com/question/28288755

#SPJ4

The molarity is 0.00024 g/l for the 1.112 grams of iron (iii) chloride into enough water to make 500.00 ml of solution.

The maximum not unusualplace manner to specific answer attention is molarity (M), that's described as the quantity of solute in moles divided through the extent of solution in liters: M = moles of solute/liters of /solution.

Read more about iron;

https://brainly.com/question/14964747

#SPJ4

wavelength of light is emitted 1.6µm

The distance between equivalent places in two consecutive light cycles is known as the wavelength of light, and the frequency of light seems to be the number of light cycles that pass a specific spot in a second.

A wavelength is the distance between two identical locations (adjacent crests) throughout successive cycles of a waveform signals that is transmitted by a wire or in space.Typically, this length in wireless systems is specified in metres , centimetres , or millimetres  

To know more about wavelength of light visit:

https://brainly.com/question/13676179

#SPJ4

The experimental percentage yield is the ratio of the actual yield of the product of a reaction to its theoretical yield multiplied by 100.

Percentage yield of a reaction is used to study the efficiency of a chemical reaction. It is the ratio of the actual yield to the theoretical yield multiplied by 100.

The actual yield of a reaction is the experimentally obtained value and it will be less than theoretical yield which is derived from the balanced chemical equation of the reaction.

For example if 5 g be the actual yield of the product in a reaction, but the theoretical or expected yield derived from the equation be 7 g.

then the percentage yield  = 5 /7 × 100 = 71.4 %.

To find more on percentage yield, refer here:

https://brainly.com/question/29714892

#SPJ1

The reaction is occurring in the test tube is Redox reaction.

What is Redox reaction?

A chemical reaction known as an oxidation-reduction (redox) reaction includes the exchange of electrons between two substances. Any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by acquiring or losing an electron is referred to as an oxidation-reduction reaction.

Fluorine is in the oxidation state -1 in compounds.

In compounds, hydrogen typically has an oxidation state of +1.

In compounds, oxygen typically has an oxidation state of -2.

Group 17 elements, Group 16 elements, and Group 15 elements all have an oxidation state of -1 in binary metal complexes.

To learn more about redox reaction from the given link:

https://brainly.com/question/13293425

#SPJ4

Sample Answer: COS, a polar molecule, shows dipole-dipole forces in addition to London Dispersion Forces, which are present in both CS2 and COS. However

the London Dispersion Forces in CS2 are so powerful that they are able to overcome the COS dipole-dipole forces as well as the LDFs. Hydrogen bonding is the intermolecular force that exists in carbonyl sulfide. This substance is frequently employed in several small-scale chemical production processes. The greatest intermolecular force is the Coulomb or electrostatic force, which is also responsible for the ionic bonding of salts like NaCl. The electrostatic force is attractive for atoms with opposing charges, although that is an oversimplification of what actually occurs between atoms.

To learn more about intermolecular please click on below link

https://brainly.com/question/9007693

#SPJ4

Complete this table relating the values of E cell and ΔG to the Q/K ratio, given below:

In an electrochemical cell, the potential difference between two half cells is measured by the cell potential, or Ecell. The capacity of electrons to go from one half cell to the other is what determines the potential difference.

The following is how the Nernst equation may be represented for measurements made at 298K. E = E₀ - 0.0592/n log10 Q.

As a result, according to the Nernst equation, the reaction quotient determines the overall potential of an electrochemical cell.

Because they are not spontaneous, electrolytic cells, which are reactions that only take place with the input of an external energy source, are considered negative. They're spontaneous if Ecell is positive.

The completed table is given below:

Q/K            Ecell            delta G

<1               >0                  <0

=1               =0                  =0

>1               <0                  >0

To know more about E cell refer to:

https://brainly.com/question/3807566

#SPJ1

The number of grams of aluminum required to prepare 125.0 g of chromium metal by the first reaction is approximately 32.4 g.

To calculate the number of grams of aluminum required to prepare 125.0 g of chromium metal, you need to balance the chemical equation for the reaction between aluminum and chromium oxide to determine the stoichiometry of the reaction.

Here is the balanced chemical equation for the reaction:

Al + Cr2O3 -> 2 Cr + Al2O3

From the balanced equation, we can see that for every mole of aluminum that reacts, 2 moles of chromium are produced. We can use the molar masses of aluminum and chromium to determine the mass of aluminum required to produce a given mass of chromium.

The molar mass of aluminum is 26.98 g/mol, and the molar mass of chromium is 52.00 g/mol. Using these values, we can calculate the mass of aluminum required to produce 125.0 g of chromium as follows:

125.0 g Cr / 52.00 g/mol = 2.40 moles Cr

2.40 moles Cr * (1 mole Al / 2 moles Cr) = 1.20 moles Al

1.20 moles Al * 26.98 g/mol = 32.4 g Al

Therefore, the number of grams of aluminum required to prepare 125.0 g of chromium metal by the first reaction is approximately 32.4 g.

Learn more about chemical equation, here brainly.com/question/28294176

#SPJ4

[BrF4] - is a non-polar molecule.

A molecule's polarity reveals whether the electron cloud is evenly distributed among its atoms or whether an electronegative atom is having an impact on the electron density. The behavior and reactivity of the molecule will be influenced by the electron distribution. For instance, if you know a chemical's polarity, you may anticipate which solvents would work best with it.

Despite the fact that they are both homogeneous solutions on their own, water and oil do not mix well. A more thorough examination of the polar forces influencing the two solutions will shed light on this phenomenon.

it is called Tetrafluoroborate ion

Bond order = 0.5

[BrF4] - is a non-polar molecule.

To refer more about Polarity visit:

https://brainly.com/question/2615067

#SPJ4

If first-order kinetics governs nuclear decay, it will take 50 DAYS for a specimen of chromium-51 to degrade from 35.0 grams to 10.0 grams.

Atoms undergo radioactive decay when a nuclear configuration with such a lower energy exists available to which they can transition. The decay of a single atom actually occurs arbitrarily; it is not the result of the atom maturing or changing over time.

The largest nuclear electricity generator in 2021 will be the United States, which will generate 771,638 GWh of nuclear energy, followed by China, which will generate 383,205 GWh. As of August 2022, 438 reactors with a net power of 393,333 MWe and 56 reactors with a combined total of 57,848 MWe were in operation.

Nuclear transmutation processes and nuclear decay processes are the two categories into which nuclear processes can be separated. When an unstable nucleus becomes the nucleus with one or more other elements, nuclear decay, sometimes referred to as radioactive decay, takes place, it emits radiation.

To know more about  nuclear decay visit:

https://brainly.com/question/21114779

#SPJ4

When 0.55 grams of solid calcium chloride, is dissolved in 250 ml of water, the pH of the solution is 1.7.

given that :

mass of sodium chloride , CaCl₂ = 0.55 g

volume = 250 ml = 0.25 L

moles of sodium chloride = mass / molar mass

                                           = 0.55 / 111

                                            = 0.00495 mol

the molarity expression is given as :

Molarity = moles / volume in L

               = 0.00495 / 0.25

               = 0.0198 M

pH = - log (0.0198 )

     = 1.7

The pH of the solution which contains the 0.55 g of sodium chloride in the water of 250 ml is 1.7.

To learn more about pH here

https://brainly.com/question/491373

#SPJ4

A crowd is something that has size, size, or quantity, and units are a kind of measure.

Give examples?

Example 1: The quantity represented by a teaspoon of volume, teaspoon is a unit and volume is a quantity.

Example 2: If there are 236 kg, the 236 is the quantity while kg is the units.

What is a unit?

A unit is a single complete part of something, like a building block. In math classes, you may take a unit of algebra before taking another unit of geometry. There are also units of measurement such as inches and miles.

The word unity comes from mathematics, but has branched out to refer to a single thing that is part of a larger one. Each apartment in the building is a unit. A unit can also be a small group that fits into a larger social organization, such as a military unit or a family unit. In both cases the units are part of a larger whole.

Therefore, A crowd is something that has size, size, or quantity, and units are a kind of measure.

To know more about unit, visit:

https://brainly.com/question/4804631

#SPJ4

The electron geometry of CFCl3 is tetrahedral. In the tetrahedral shape,  the molecule has four atoms.

CFCl3, also known as trichlorofluoromethane, is a molecule made up of one carbon atom and three chlorine atoms. To draw the Lewis dot structure of CFCl3, we first need to draw the skeletal structure of the molecule, which shows the arrangement of the atoms. The skeletal structure of CFCl3 is as follows:

C – Cl – Cl – Cl

Next, we need to add the valence electrons to each atom. Carbon has 4 valence electrons, while chlorine has 7. We can draw the Lewis dot structure of CFCl3 by adding the valence electrons to each atom like this:

C: . . . .

Cl: . . . . . . .

Cl: . . . . . . .

Cl: . . . . . . .

In this Lewis dot structure, each chlorine atom has a full octet (8 valence electrons), while the carbon atom has an octet plus one (9 valence electrons). The overall electron geometry of CFCl3 is tetrahedral, which means that the molecule has four atoms arranged in a tetrahedron shape. The molecular geometry of CFCl3 is also tetrahedral, which means that the actual arrangement of the atoms in the molecule is a tetrahedron.

Learn more about Lewis structure, here https://brainly.com/question/20300458

#SPJ4

Consequently, the reaction's yield percentage is 36 moles.

Moles (nevi) are a common form of skin development. They often appear as tiny, dark brown spots and are caused by clusters of pigment-forming cells (melanocytes) (melanocytes). Most people have between 10 and 40 moles, which typically appear between the ages of 10 and 40 and may change or vanish over time. A condition that affects the pigment-producing skin cells that are frequently known as moles or birthmarks. Raised, flat, or rough melanocytic nevi are all possible. They could be present at birth or develop later. Rarely, melanocytic nevi can become malignant. Most cases don't need treatment, but in some, the mole must be removed.

The borders typically have irregular, serrated, or hazy shapes. The pigment may cover the skin in the vicinity. Uneven color: Tan, brown, & black shades may be present in variable amounts. Patches of white, grey, red, pinkish, and blue are also possible.

The balance numbers are the same. (The remaining balance is 2 and 2)

The O2's balance is indicated by the number 1.

Therefore, two moles of NO2 should be created for every mole of O2 required.

20 mols of NO2 should be created for every 10.0 moles of oxygen utilized.

The proper formula is:

(What was produced / What Should Have Been Produced) * 100 = % yield.

What was created equaled 7 moles.

20 moles should have been generated.

Substitute the givens into the equation

% yield =7.2 /20 * 100

% yield = 0.36 * 100

Therefore the answer is 36moles.

To know more about Moles visit:

https://brainly.com/question/26416088

#SPJ4

The atomic packing factor for HCP is 0.74.

(a) APF=  (no. of atoms/cells)(Volume of each atom)/ Volume of unit cell

For the HCP crystal structure, the ideal c/a ratio is 1.633.

(b) (c/2)² = a²- sk

What is a crystal structure?

In crystallography, a crystal structure is a description of the regular arrangement of atoms, ions, or molecules within a crystalline material. The ordered structure results from the inherent property of constituent particles to form symmetrical patterns that repeat along the main directions of the three-dimensional space of matter.

The smallest group of particles in the material that make up this repeating pattern is the unit cell of the structure. A unit cell perfectly reflects the symmetry and structure of the entire crystal. It is constructed by repeatedly moving the unit cell along the principal axis. The translation vector defines the nodes of the Bravais lattice.

The length of the long axis or edge of the unit cell and the angle between them is the lattice constant, also called the lattice parameter or cell parameter. Crystal symmetry is described by the space group concept. All possible symmetric arrangements of particles in three-dimensional space can be described by the 230 space group.

To know more about crystal structure, visit:

https://brainly.com/question/195576

#SPJ4

The solar nebula was (a) rock and metal.

The solar system has evolved significantly since its birth. Many moons formed from disks of gas and dust orbiting their parent planets, while others are thought to have formed independently and later been captured by their planets. Moreover, like Earth's Moon, it could also be the result of a giant impact. Collisions between celestial bodies continue to occur to this day and are central to the evolution of the solar system. Due to gravitational interactions, the planets may be misaligned [2]. It is now believed that this planetary migration was responsible for much of the early development of the solar system. Known as the

Nebula Hypothesis, this model was first developed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace. Subsequent developments have interwoven various scientific disciplines, including astronomy, chemistry, geology, physics and planetary science. Since the dawn of the space age in the 1950s and the discovery of exoplanets in the 1990s, models have been challenged and refined to explain new observations.

The solar nebula was a disk-shaped cloud of gas and dust composed of rock and metal particles, hydrogen compounds (such as water, methane, and ammonia), and a mixture of hydrogen and helium. This mixture of materials is what eventually coalesced to form the sun, planets, and other objects in the solar system.

Learn more about Solar Nebula:

https://brainly.com/question/28715616

#SPJ4

Photosynthesis produces glucose (C₆H₁₂O₆) which is stored in the form of starch, and oxygen (O₂) which will be released. To be able to carry out photosynthesis, it takes carbon dioxide (CO₂) which is taken from the air through the stomata. In addition, water (H₂O) is also needed which is taken from the soil by the roots, then distributed to the leaves through the xylem.

In photosynthesis, sunlight energy reacts with six molecules of carbon dioxide (CO₂) and six molecules of water (H₂O) to produce one molecule of glucose (C6H12O6) and six molecules of oxygen (O₂). With the equation:

6CO₂ + 6H₂O + light = C₆H₁₂O₆ + 6O₂

From these results CO₂ is converted into solid glucose for plants to consume along with water. While oxygen (O₂) is released into the air.

Learn more about photosynthesis here: https://brainly.com/question/13027734

#SPJ4

In the compound cobalt(III) chromate, the number of cobalt atoms are 2,the number of chromium atoms are 3 and the number of oxygen atoms are 12.

A molecular formula is a manner of offering records approximately the chemical proportions of atoms that represent a specific chemical compound or molecule, the usage of chemical detail symbols, numbers, and from time to time additionally different symbols, which include parentheses, dashes, brackets, commas and plus and minus signs.. The molecular formula of Cobalt(III) chromate is Co_2(CrO_4)_3. Thus, the number of cobalt atoms are 2,the number of chromium atoms are 3 and the number of oxygen atoms are 12.

To learn more about molecular formula check the link below:

https://brainly.com/question/20442936

#SPJ4

The heat released by 4.44 mol of the ideal monatomic gas of a carnot engine is 991 J. the low temperature (388 k) contraction ends at 55.5 l.. the volume at the beginning of this contraction is 51.82 L.

Using the expression is given as :

W = n RT ln (Vf / Vi)

991 J = 4.44 mol × 8.314 J / mol K × 388 ln (55.5 / Vi )

991 = 14322.69 ×  ln  (55.5 / Vi )

0.0691 =   ln  ( 55.5 / Vi )

(55.5 / Vi ) = 1.071

Vi = 51.82 L

The initial volume of the monoatomic gas is 51.85 L.

To learn more about monoatomic gas here

https://brainly.com/question/14123140

#SPJ4

Answer:s03

Explanation:

Consider the Lewis structure of RnCl2, its electron geometry is trigonal bipyramid and molecular geometry is Liner.

From the lewis structure. The Loan pairs are kept on Rn using 3orbitals.

Chlorine forms two pi bonds using two orbitals.

Needed hybridized orbitals in total: 5

i.e. S,3p,1s

Sp³d = hybridization

so,

Trigonal bipyramidal electron is the geometry

Liner is the molecular geometry

To determine the types of molecules, we must comprehend the Lewis electron dot structure. Although it does not inherently describe how molecules might look, the Lewis hypothesis is the first step in anticipating molecular structures. The Lewis structure helps us distinguish between bond pairs and lone pairs. Next, we use the valence-shell electron-pair repulsion (VSPER) theory to the Lewis structure to determine the molecular geometry and the electron-group geometry.

learn more about Electron geometry here:

brainly.com/question/7558603

#SPJ4

There is a Carbon atom (C) at the core of the COBr2 Lewis structure, which is surrounded by two Bromine atoms (Br) and one Oxygen atom (O). Between the carbon (C) and oxygen (O) atoms, there is a double bond, while between the carbon (C) and bromine (Br), there is a single bond.

The following formula is used to determine the steric number: Number of lone electron pairs on the core atom times the Steric Number plus (number of atoms bonded to the central atom)

The idea of steric number is particularly helpful because it informs us of the quantity of hybridized orbitals that exist. Thus, you sum up to determine the steric number.

To know more about Lewis structure visit:-

https://brainly.com/question/12476602

#SPJ4

Stoichiometry interconverting number of atoms and mass of compound that contains million (1.ox106), the mass of glucose (C6H,206, carbon atoms is 110.00 gm.

The relationship between the quantities of reactants and products prior to, during, and after chemical processes is known as stoichiometry. Stoichiometry is based on the law of conservation of mass, which states that the sum of the masses of the reactants and products must equal one another. This realization led scientists to conclude that the ratio of positive integers is typically formed by the relationships between the quantities of the reactants and products. This means that the amount of the product may be determined if the amounts of the individual reactants are known. On the other hand, if the amount of one reactant is known and the amount of the products can be computed using empirical data, the amount of the other reactants can likewise be calculated. This is seen in the following figure, where the balanced equation reads: CO2 + 2 H2O CH4 + 2 O2

In this reaction, two molecules of oxygen gas combine with one methane molecule to form carbon dioxide and two molecules of water. A full combustion is demonstrated in this chemical equation. To ascertain the quantity of products and reactants generated or required in a particular process, stoichiometry examines these quantitative correlations. Reaction stoichiometry is the description of the quantitative interactions between substances as they take part in chemical processes.

To know more about Stoichiometry please refer: https://brainly.com/question/9743981

#SPJ4