. Calculating The half-life of iron-59 is 44.5 days.
After 133.5 days, 2.76 g of iron-59 remains.
What was the mass of the original sample?


-SOMONE JUST PLEASE HELPP ME IM LITERALLY STUCK!!

Answer:

C. T shaped

Explanation:

had this last year

The shape of XeF3+ is T-shaped. Therefore, option C is correct.

The three-dimensional configuration of the atoms that make up a molecule is known as molecular geometry. It provides data on the molecule's overall shape as well as bond lengths, bond angles, torsional angles, and any other geometrical aspects that affect each atom's location.

The structure that results has a Y-shaped geometry and an electrical structure of b22 a10. The T-shaped and Y-shaped structures of XeF3- are therefore a Jahn-Teller pair of states deriving from the identical D3h ion, as can be shown by this molecular orbital image.

The geometry of XeF3+ is T-shaped because the centre atom, Xe, is surrounded by 3 bond pairs and 2 lone pairs.

Thus, option C is correct.

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The grams of potassium chloride (KCI are needed to prepare 0.750 L of a 150 M solution of potassium chloride in water is the

83.81 g.

Given that :

Molarity of the KCl = 1.50 M

Volume of the potassium chloride = 0.750 L

The Molarity expression is given below :

Molarity = moles / volume in L

moles = Molarity × volume

moles = 1.50 × 0.750  

moles = 1.125 mol

molar mass of the KCl = 74.5 g/mol

Mass of the KCl = moles × molar mass

Mass of the KCl = 1.125 × 74.5

                          = 83.81 g

Thus, the mass of KCl is 83.81 g

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Answer: d 1.0l

Explanation:

Answer:

Explanation:

Structure of 3-ethyl-5-isobutylnonane

It is given in the following attachment:

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The organic compound 3-ethyl- 5-isobutylnonane contains 9 carbon atoms in the long chain and one ethyl branch at the third carbon atom and one isobutyl group in the 5th carbon atom as in the image.

Hydrocarbons are organic compounds with carbon -hydrogen bonds. The organic compounds are named based on the rules of IUPAC. The compound gets its basic name from the number of carbon atoms in the longest chain.

If the number of carbons atoms is one, the chain is given its suffix meth, eth for two prop for three and so on. The chain with 9 carbon atoms are named with nonane in the end.

Here, the given compound contains an ethyl group as a branch in third carbon in the chain and an isobutyl group in the 5th position as shown in the image given below:

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Materials such as concrete, bricks and tiles absorbs and store more heat as compared to materials such as timber and cloth which have low thermal masses.

Thermal mass in floors is most effective. In most of the climate conditions a concrete slab which is insulated underneath and around the edge and where it is in direct contact with the ground absorbs more energy and thus it is the most effective way to increase thermal mass.

Thermal mass refer to the property of construction materials to absorb, store, and release heat energy.

Water also have high thermal mass.

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Answer:

Yes

Explanation:

Yes, I do think they mean the same thing. Explanation: 150 grams and 150 grams are the same thing and adding 0 to the end of a decimal

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, 150grams and 150.0 grams are the same measurement.

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.

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. 150 grams and 150.0 grams are the same measurement as both have same measurement.

Therefore, 50 grams and 150.0 grams are the same measurement.

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Answer:

14.5 moles of CH4

Explanation:

There is 14.5 moles of carbon in the product CO2....there has to be 14.5 moles of carbon in the reactant CH4

   14.5 moles

B. Br-

Ionic radius is a way of measuring the size of an element or compound.

Ionic Radius

Ionic radius is defined as the distance between the nucleus of an atom and the outermost electron. In terms of the periodic table, ionic radius grows to the left and down. The largest element on the periodic table is Francium since it is the lowest element on the left side.

Effective Nuclear Charge

The ionic radius of cations (positive ions) is always smaller than the regular element. Also, the ionic radius of anions (negative ions) is always larger. This is due to effective nuclear charge. Effective nuclear charge is how attracted electrons are to the nucleus. As electrons are added, effective nuclear charge decreases as the shielding effect becomes larger. Additionally, as the negative charge increases, the positive charge has less pull. The opposite is true for cations.

Since the electrons are less attracted to the nucleus in anions, they spread out more. This causes the radius to increase. For this reason, Br- has the largest ionic radius out of the listed options.

The frequency of radiation with a wavelength of 492 nm is

6.09 x 10^14 Hz.

What is the meaning of frequency of radiation of wavelength?

Frequency of radiation of wavelength is a measure of how often a particular wavelength of radiation occurs. It is measured in Hertz (Hz) and is equal to the number of wave cycles per second. Wavelength is the distance from one wave crest to the next, so frequency is related to the speed of the wave. A higher frequency corresponds to a shorter wavelength, and a lower frequency corresponds to a longer wavelength.

λ= 480nm =480×10−9m       [∵1nm=10−9m]

c=3×108m/sec

Frequency, v=λ/c

       =[tex]\frac{3*10^{8}ms^{-1} }{480*10^{-9}m }[/tex]

      = [tex]6.09*10^{14}s^{-1}[/tex]

       =[tex]6.09*10^{14} Hz.[/tex]

Therefore, 6.09 x 10^14 Hz is the answer.

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The molarity when 24 grams of LiOH is added to 200 ml of water is 4.2M.

The moles of solute per liter of solution is measured as molarity. For instance, when table salt is dissolved in water, water serves as both the solution and the solute. Sodium chloride weights 58.44 grammes per mole. One molar solution, or 1M, is created by dissolving 58.44 grammes of sodium chloride in one liter of water.

The term "total moles of a solute contained in a kilogram of a solvent" is used to describe molality. Molal concentration is another name for molality. It is a measurement of a solution's solute concentration.

The molarity of the given LiOH solution is found to be 1.99 mol/L or 1.99M.

Given weight = 20g

molar mass of lithium hydroxide = 7+16+1=24g

volume = 200ml = 0.2l

Number of mole (n) = given weight /molar mass of lithium hydroxide

n = 20/24 =0.84

Molality = Number of mole (n) /volume of solvent

molality = 0.84/0.2

= 4.2M

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The balanced equation is, 2C₂H₆ + 7O₂ →  4CO₂ + 6H₂O.

The reaction's balanced equation is as follows.

C₂H₂+O₂ → CO₂+H₂O

Water and carbon dioxide gas are created when dimethyl ether and oxygen combine.

Following is the reaction's balanced chemical equation:

2C₂H₆ + 7O₂ →  4CO₂ + 6H₂O.

Three moles of water and two moles of carbon dioxide gas are produced in this reaction when one mole of dimethyl ether combines with two moles of oxygen gas.

According to the law of conservation of mass, the mass of the reactants and products in a chemical reaction should be equal. As a result, each element's number of atoms stays constant throughout the chemical reaction. As a result, the chemical equation that represents the chemical process needs to be balanced. A chemical equation is considered to be balanced when the sum of the atom counts on the reactants and products sides equals one.

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Complete question -

Balance the given equation -

__C2H2 + __0₂ → __CO₂ + __H₂O

The most efficient set of materials would be 0.5 mol of [tex]C_6H_{12}O_6[/tex] and 3.0 mol of [tex]O_2[/tex]. Option D.

From the balanced equation of the reaction illustrated in the image, the mole ratio of [tex]C_6H_{12}O_6[/tex] to [tex]O_2[/tex] is 1:6. In other words, for every 1 mole of [tex]C_6H_{12}O_6[/tex] that is consumed in the reaction, 6 moles of [tex]O_2[/tex] is required for a complete reaction.

In order for the reaction to remain efficient without any of the reactants remaining after the reaction, the mole ratio of the 2 reactants has to be maintained.

Thus:

In other words, only 0.5 mol of [tex]C_6H_{12}O_6[/tex] and 3.0 mol of [tex]O_2[/tex] will leave no leftovers after the reaction.

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There are 4 valence electrons in an atom of C and 6 valence electrons in an atom of S. So, there is a total of 10 valence electrons in the CS molecule (6+4=10).

So, the carbon and sulfur form a triple bond in this compound so as to complete the octet of both C and S in the CS molecule. Also, there is an electron pair on both C and S.

Formal charge = valence electrons - (number of bond pairs + number of electrons present as lone pair)

The formal charge on C = 4 - (3 + 2) = 4 - 5 = -1

The formal charge on S = 6 - (3 + 2) = 6 - 5 = +1

The Lewis structure of the CS molecule is shown below:

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Answer:

Because unlike Earth and other solid objects, the entire Sun doesn't rotate at the same rate. Because the Sun is not solid, but is instead a giant ball of gas and plasma, different parts of the Sun spin at different rates. The interior of the Sun does not spin the same way as does its surface.

Answer:

A

Explanation:

That one doesn't fall in the category of carbon cycle. It has nothing to do with natural causes since it is a man made thing. Industrial activities is not a natural cause.

Doses of gamma rays, X-rays of electromagnetic radiation and beta particles are measured with simple piece of equipment.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

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The compounds can be distinguished via UV spectroscopy by measuring their value.1,3-pentadiene is a type of conjugated compound while 1,4-pentadiene is not conjugated.

This causes the of 1,3-pentadiene to be higher than 1,4-pentadiene allowing us to distinguish between both. Using UV spectroscopy we measure the quantity or amount of light being absorbed by the sample and compare the obtained values. Thus, 1,3-pentadiene and 1,4-pentadiene can be distinguished by comparing their values obtained by UV spectroscopy.

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This transition has a lower energy for conjugated systems like 1,3-cyclohexadiene. Since this transition has a greater energy for unconjugated systems like 1,4-cyclohexadiene, the wavelength is typically too short to be visible.

cyclohexadiene diols are excellent starting materials for the synthesis of complex natural compounds due to their inherent benefits. For the synthesis of polyhydroxylated targets such inositols, cyclitols, and carbohydrates, the diol moiety is the ideal place to start. The chemical compound cyclohexa-1,3-diene has the formula (C2H4)(CH)4. It is a flammable, colourless liquid. It has a 20 °C, D, refractive index of 1.475. Terpinene, a substance found in pine oil, is a 1,3-cyclohexadiene derivative that occurs naturally. Cyclohexane, which has the chemical formula C6H12 and is planar and cyclic, lacks delocalized pi electrons (since there are no pi bonds), and it also does not abide by Huckel's rule. As a result, it lacks fragrance.

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This is possible because the volume of water displaced by an object is determined by the volume of the object, not its weight or mass.

The cube of metal I and the cube of another metal both have the same volume, so they would displace the same volume of water. The principle of buoyancy states that the buoyant force on an object is equal to the weight of the fluid that is displaced by the object can be applied in here. Therefore, if two objects have the same volume, they will displace the same amount of fluid and experience the same buoyant force.

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If the temperature increases, then the concentration of sodium hydroxide (NaOH) will decrease because the equilibrium will shift in the backward direction.

Sodium hydroxide is an ionic compound consisting of Na⁺ and OH⁻. It is also called as caustic soda. It is an inorganic compound with chemical formula NaOH.

When NaOH dissolve in water it is exothermic in nature. As the temperature increases, the equilibrium will shift in the backward direction.Therefore,as to nullify the effect of increased temperature. It will decrease the solubility of NaOH in water.

Thus, If the temperature increases, then the concentration of sodium hydroxide (NaOH) will decrease.

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35.7 x 1atm/760 torr = 0.0470 atm

P(ethene) = P(total) - P(water) = 0.822atm - 0.0470atm = 0.775atm

n= PV/RT = (0.775atm)(0.0854L)/(0.08206L atm mol-1 K-1)(305K) = 0.00264mol.

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Because it is structured in a repeating pattern, the crystal of strontium chloride (SrCl2) is referred to as having an extended structure.

A group of atoms or molecules that are present in a repeating pattern and are arranged in a specific ratio are said to produce extended structures in crystals. Crystals are composed of clustered together atoms of a single element or, in some cases, molecules.

We can infer that the strontium chloride (SrCl2) crystal is regarded as an extended structure because of its organization in a repeating pattern because of its repeating pattern and constant ratio of strontium chloride (SrCl2).

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Reeta could have made the water which is fit for drinking purposes using the materials available to her.

With the available materials, Reeta would have taken the following steps to purify water.  

Firstly, she can filtered the muddy water with the help of a muslin cloth, which is mainly used for the purification purposes. Now, she has to tie a piece of Alum with the help of a thread and submerge it in water and then leave the water which is undisturbed for some time. After resting, the impurities will finally settle down at the bottom and the water from the top can be drained off. Now she has to boil the discarded water for 10 minutes by covering it with the pan and making it cool down followed by filtering the water. And finally, the water will be purified with filtration that will make it fit for drinking purpose.

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Yes, it is the right response. Although the elements are imaginary, they resemble actual elements .Nomenclature is an organism name system used in biological classification.

The Latin words nomen (name) and calare (to call) are the source of the word nomenclature. Both the Latin word nomenclatura and the English word nomenclator, which also denotes a source or broadcaster of names, relate to a list of names.

Nomenclature is an organism name system used in biological classification. Genus & species names, two Latinized nouns drawn from numerous sources, serve as indicators of the species whereby the creature belongs.

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To determine the concentration of an unknown solution, the technique that can be used is called titration.

Titration is a qualitative analysis technique which is used to calculate the unknown concentration of a given analyte in a solution.

In this process, a standard solution of known concentration and volume is taken(titrant). This solution is then allowed to react with the analyte until the endpoint attained.

In the first step of this procedure, a small amount of the analyte is added to a conical flask or a beaker, followed by the addition of a small amount of indicator. This is then placed under the burette containing the standard solution or titrant.

Small volumes of titrant are added to the analyte dropwise until a permanent colour change is observed on reaching the end point.

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If the wight of copper metal is 130.42 then molar mass of cu 63.546 u.

The International Unit System uses the mole (symbol: mol) as the measure of material quantity. How many basic entities of a specific drug are present in an object or sample is determined by the quantity of that material. It is specified that the mole comprises precisely 6.022140761023 elementary entities.

The average atomic mass of the element copper, which appears on the periodic table as 63.55 AMU, can be used to calculate its molar mass. The SI symbol of mole is mol.

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Answer b

Explanation:

Water is absorbed by CaCl2 molecules, resulting in bigger molecules. In order for the solute to dissolve in the solvent, the solute-solute interactions between the solute particles must be disrupted.

An inorganic material is calcium chloride, a salt with the chemical formula CaCl2. It is a white, crystalline substance that is highly water soluble at ambient temperature. It may be created by neutralizing calcium hydroxide with hydrochloric acid. By reducing the freezing point of water, calcium chloride is used to both prevent the production of ice and to remove it. This application makes the maximum use of calcium chloride.

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Answer:

A measurement may be reported as 18.0 mL instead of 18 mL to indicate that it has been measured with greater precision.

The decimal point in 18.0 mL indicates that the measurement was taken to the tenths place, meaning that the actual measurement is between 17.5 mL and 18.4 mL. On the other hand, 18 mL implies that the measurement is between 17.5 mL and 18.9 mL.

Therefore, the use of the decimal point in this case is a way to indicate that the measurement has a higher degree of precision. It is used as a way to communicate that the measurement was taken with greater accuracy and that the number has been rounded to the nearest tenth.

A measurement may be reported as 18.0 mL instead of 18 mL to indicate that it is an exact or precise measurement, rather than an approximation. In scientific experiments or laboratory work, measurements are often reported with a certain number of significant figures, which reflect the precision of the measurement.

In this case, 18.0 mL has one decimal point and implies that the measurement was made to the nearest 0.1 mL, whereas 18 mL doesn't have a decimal point and implies that the measurement was made to the nearest mL.

Additionally, in some cases, the trailing zero after a decimal point is used to indicate the accuracy of the measurement and to make it clear that it is not a rounded number.

Answer: divide the falling number and then get it

Explanation: find the answer

The correct answer is option d. The common name for (CH3)2CHCH2Cl is Iso-butyl chloride.

Iso-butyl chloride is a chlorinated derivative of isobutane. It is organochlorine compounds.  Isobutyl chloride is made up of compounds of chlorine, carbon, and hydrogen.

Other important details about Iso-butyl chloride is as following-

Formula: C4H9Cl

Boiling point: 69 °C

Molar mass: 92.57 g/mol

Density: 877 mg mL−1

Melting point: −131 °C (−204 °F; 142 K)

Heat capacity (C): 158.6 J K−1 mol−1

Refractive index (nD): 1.398

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