a _ is a push or pull

Based on the the relative strengths of the intermolecular attractions, the correct selections are:

a. C₃H₈ > CH₄

c. ICl > I₂

e. H₂Se > H₂O

g. CH₂Cl₂ > CH₃Cl

i. NOF > NOCl

To determine the substance with the higher boiling point based on the relative strengths of intermolecular attractions, we need to consider the types of intermolecular forces present in each substance. The stronger the intermolecular forces, the higher the boiling point.

a. C₃H₈ > CH₄: C₃H₈ (propane) has a higher boiling point than CH₄ (methane) because propane has a larger molecular size and exhibits stronger London dispersion forces due to increased electron-electron interactions.

c. ICl > I₂: ICl (iodine chloride) has a higher boiling point than I₂ (diatomic iodine) due to the presence of polar covalent bonds in ICl. The dipole-dipole interactions between the polar I-Cl bonds in ICl are stronger than the London dispersion forces in I₂.

e. H₂Se > H₂O: H₂Se (hydrogen selenide) has a higher boiling point than H₂O (water) because H₂Se molecules exhibit stronger London dispersion forces compared to H₂O, which has hydrogen bonding.

g. CH₂Cl₂ > CH₃Cl: CH₂Cl₂ (dichloromethane) has a higher boiling point than CH₃Cl (chloromethane) due to the presence of two chlorine atoms in CH₂Cl₂, which enhances the strength of London dispersion forces compared to the single chlorine atom in CH₃Cl.

i. NOF > NOCl: NOF (nitrogen monoxide fluoride) has a higher boiling point than NOCl (nitrogen monoxide chloride) because the fluorine atom in NOF forms a stronger hydrogen bond with nitrogen compared to the chlorine atom in NOCl, resulting in stronger intermolecular forces.

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Size of an atom increases as we move down a group and from left to right across a period

Define an atom?

An atom is a unit of matter that specifically characterizes a chemical element. One or more negatively charged electrons surround the core nucleus of an atom, which is made up of all of them. One or more protons and neutrons, which are comparatively heavy particles, can be found in the positively charged nucleus.

In a group, as the atomic number rises, the atomic size expands from top to bottom. Valence electrons are located farther from the nucleus because there are more filled energy levels, which increases atomic size.

Atomic size grows as a function of period number, number of shells, and so forth. Since there are more electrons in each shell as we move from left to right in a period, the force of attraction between the nucleus and electrons, which have positive charges, is stronger, bringing the shells closer to the nucleus and shrinking the size of the atom.

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With bipyridyl, the iron (II) ion forms a reddish-violet complex. Colorimetry is used to measure the complex's concentration, and the quantity of iron overall in each tablet is derived from the complex's concentration.

The vitamin tablet's digestion must be done under a fume hood. O-phenanthroline and iron +II react to generate a colored complex ion. A Spectronic 301 spectrophotometer is used to gauge the color species' intensity.

The concentration of the unknown iron sample is calculated using a calibration curve (absorbance versus concentration) for iron +II. The regulation of iron metabolism is a key function of ascorbic acid. It has long been recognized as improving iron absorption from test meals.

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Properties of water: a. When ionic solutes are dissolved in it, water freezes more easily. d. Water can be liquid at a variety of temperatures. e. Water is polar and a solvent due to the hydrogen bonds that exist in it.

Water has various characteristics, including cohesion, adhesion, capillary action, surface tension, the capacity to dissolve a wide range of compounds, and high specific heat. Cohesion is the term used to describe the propensity of water molecules to form weak connections and adhere to one another.

Water is known as the "universal solvent" because of its enormous capacity to disintegrate a wide range of molecules. It is this capacity that makes water such a crucial life-sustaining factor. Water's function as a solvent aids cells in the biological transport and utilisation of materials like oxygen and nutrients.

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Standard pressure is equal to 1 atm. Therefore option 1 is correct.

Standard pressure is equal to 1 atm, which stands for atmosphere. It is a unit of pressure commonly used in the field of chemistry and physics. Standard pressure is defined as the pressure exerted by a column of mercury in a barometer when the atmospheric conditions are at standard temperature and pressure (STP).

STP is defined as a temperature of 0 degrees Celsius (273.15 Kelvin) and a pressure of 1 atmosphere (1 atm). Therefore, at STP, the standard pressure is equal to 1 atm.

While pressure can be measured in various units such as pascals (Pa), kilopascals (kPa), and atmospheres (atm), the standard pressure is specifically defined as 1 atm.

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Answer:

c

Explanation:

As we know science is all about fact so from many years scientist use to predict the future or events so answer is in my opinion c

The percent composition of hydrogen by isotope, assuming that hydrogen's only isotopes are 1H and 2D, is 99.2% H and 0.8% D. (B)


1. The atomic weight of hydrogen is given as 1.008 amu.
2. The isotopes of hydrogen are 1H (with a mass of 1 amu) and 2D (with a mass of 2 amu).
3. To find the percent composition, we need to determine the relative abundance of each isotope.
4. Since the atomic weight is an average of the isotopic masses weighted by their abundance, we can set up an equation: (1 * x) + (2 * (1-x)) = 1.008, where x represents the relative abundance of 1H.
5. Solving for x, we get x = 0.992.
6. The relative abundance of 2D is 1-x = 0.008.
7. Convert these abundances to percentages: 1H is 99.2% and 2D is 0.8%.(B)

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To draw the Lewis structure for sulfate (SO₄²⁻) with minimized formal charges and determine the total likely resonance structures, follow these steps:

1. Identify the central atom: Sulfur (S) is the central atom in the sulfate ion.
2. Count the total number of valence electrons: Sulfur has 6, each oxygen has 6, and there are 2 extra electrons due to the 2- charge. So, the total number of valence electrons is 6 + 4(6) + 2 = 32.
3. Connect the central atom to the surrounding atoms with single bonds: Connect the sulfur atom to each of the four oxygen atoms using single bonds. This uses up 8 valence electrons (2 for each bond).
4. Distribute the remaining valence electrons to complete the octets of the surrounding atoms: 32 - 8 = 24 valence electrons are left. Distribute them to the four oxygen atoms to complete their octets (6 electrons for each oxygen atom).
5. Check for the need for multiple bonds to satisfy the octet rule for the central atom: Sulfur has 8 electrons around it (1 from each single bond), so the octet rule is satisfied.

Now, the Lewis structure is complete with minimized formal charges. However, there are multiple resonance structures for SO₄²⁻. Since sulfur can form double bonds with any of the four oxygen atoms, there are a total of 4 likely resonance structures for SO₄²⁻, with one double bond in each resonance structure and the remaining oxygen atoms having single bonds.

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Answer:

hydrogen is a non-metal and it has 1 valence electron

Explanation:

You can find the valence electrons on the bottom left of your periodic table, it is under the atomic number. Hydrogen is a non-metal because hydrogen conducts heat and electricity poorly.

Answer:

This is the answer

Explanation:

charges passed = current x time = 10 x 3 x 60

= 1800 C

mole of charge = 1800 / 96500

= .01865 moles

Au+3 contains 3 positive charges

3 mole of charge will deposit 1 mole of Au .01865 moles will deposit .01865 / 3 mole

= 6.2167 x 10-3 moles.

Asnwer: average atomic mass of chromium is 52amu

Calculations:

49.946amu: 4.350%= 0.0435

51.941amu: 83.790%= 0.8379

52.941amu: 9.500%= 0.095

53.939amu: 2.360%= 0.0236

Average atomic mass of chromium = 0.0435(49.946) + 0.8379(51.941) + 0.095(52.941) + 0.0236(53.939)

= 51.9963703amu

= 52 amu

Answer:

Force required = 600 N

What is Work?

Work is the energy transferred to or from an object via the application of force along a displacement or distance.

Work is calculated as the product of the force strength and the distance travelled. i.e, W = Fd.

∴ W = Fd

3600 = F×6

F = 600 N

When we mix 250 mL of 2.1 M HBr with 200 mL of 2.5 M KOH. The pH of the resulting solution is 12.7 .

The volume of the HBr = 250 mL

The molarity of the HBr = 2.1 M

The moles = molarity × volume

                   = 0.250 × 2.1

                   = 0.52 mol

The volume of the KOH = 200 mL

The molarity of the KOH = 2.5 M

The moles = molarity × volume

                 = 2.5 × 0.200

                 = 0.5 mol

The KOH is excess, the excess amount is = 0.525 - 0.5

                                                                      = 0.025 mol

The equation is as :

HBr + KOH ---->  KBr  +  H₂O

The total volume = 0.250 + 0.200

                             = 0.45 L

The concentration of [OH⁻] = 0.025 / 0.45

                                             = 5 × 10⁻² M

pOH = - log ( 5 × 10⁻² )

pOH = 1.3

pH = 14 - pOH

pH = 14 - 1.3

pH = 12.7

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Answer:

2AL + 3CUO = AL2O3 + 3CU

hope it helps

The acid that will react with strontium hydroxide to produce strontium chloride in a neutralization reaction is hydrochloric acid (HCl).

When strontium hydroxide reacts with hydrochloric acid, the products formed are strontium chloride (SrCl2) and water (H2O). The chemical equation for the neutralization reaction is as follows:

Sr(OH)2 + 2HCl → SrCl2 + 2H2O

Here, Sr(OH)2 is the base (strontium hydroxide) and HCl is the acid that undergoes a neutralization reaction. The products formed are a salt (strontium chloride) and water.

Neutralization reactions are a type of chemical reaction that occurs when an acid reacts with a base to form a salt and water.

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The relative atomic mass of an element is the mass of its atoms with Carbon element.

The atomic mass of an element is defined as the average mass of the element.

Atomic mass is also defined as the mass of nucleus or it is the sum of atomic number and number of neutrons present in the atom of an element.

Relative atomic mass is defined as the atomic mass compared to One-twelvth the mass of the one atom of carbon. Since, it is seen that it is comparison of atomic mass with 1/12 the mass of an atom of carbon therefore it is indicated as relative atomic mass.

Thus, we concluded that the relative atomic mass of an element is the 1/12 the mass of its atoms with Carbon element.

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Answer:

fermentation of crops that are high in sugar (starch) or fat into ethanol,

Explanation:

Hiya!

I believe the answer is...

C.

I hope this is right!

\(Sokka\)

Answer:

C

Explanation:

Fission reactions run out of control, while chemical reactions are controlled. :)

"Chemical reactions are depends on electrons while fission depends on protons. In fission , there is no any effect of temperature while in case of chemical reaction rate of reaction will be affected."

What is chemical reaction?

The type of reaction in which more than one molecule get combined and form a different kind of product then such type of reaction can be considered as chemical reaction.

What is Fission reaction?

Fission is the breaking of a heavy nucleus into lighter nuclei, while fusion is the joining of nuclei to create a larger and heavier nucleus.

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The translation of the question is

Commercial solutions of HCl (MP = 36.5 g / mol) are typically 39.0% W / W of this acid in water. Determine the molality of the HCl solution if its density is equal to 1.20 g / ml.

Answer:

Molality is 17.51 molal

Explanation:

We are given 39% w/w of HCl, this means for every 100g of this solution we have 39g of HCl in it.

to ease the calculation we assume we have 1L(1000ml) of this solution is present.

Density = mass /volume

1.20 = mass/1000

mass = 1200 g of solution

and we are given that 39% of this solution is will contain HCl

so

1200 * 39/100 = 468g of HCl present

no of moles of HCl = 468/36.5 = 12.82moles

mass of solution = mass of water + mass of acid

mass of water = mass of solution - mass of acid

Mass of water = 1200 - 468 = 732g of water

Molality = moles /masss of water in kg

             = 12.82 *1000/732  =17.51molal

Answer:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Option (A) is correct. CaSO4 is most soluble in water rather than 1.0M CaCl2(aq.). This is according to the concept of Common ion effect and solubility.

The solubility product of CaSO4 Ksp = 3x10-5

CaSO4 is sparingly soluble in water and this equilibrium is setup between the solid and its ions in solution.

if we add 0.5M K2SO4 solution, the sulfate ion (SO4-2) is the common ion to both of them. this is the origin of the term "common ion effect". according to Lech atelier's principle , the position of equilibrium would shift in order to count what have just done.  in this case, it would tend to remove sulfate ion (SO4-2) by making extra solid calcium sulfate. hence it will less soluble and the concentration of calcium ions in the solution  will decrease. 

similarly , if we add 1.0M CaCl2, it will less soluble and the concentration of sulfate ions (SO4-2)  in the solution will decrease.

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A) Rearrangements are NOT observed in this reaction type. The reaction that is taking place is a hydrogenation reaction, which is a reaction where a molecule of hydrogen is added to a substrate.

In hydrogenation reactions, no rearrangements are observed. The reactant molecules are kept intact and only the addition of hydrogen takes place, resulting in a product with a hydrogen atom bonded to the substrate. Thus, in the given reaction, no rearrangements are expected to take place.

In hydrogenation reactions, the substrate is usually treated with a catalyst, such as HCI, to facilitate the reaction. In this case, HCI is the catalyst, and it is not expected to undergo any rearrangements. Thus, the answer to the question is A) Rearrangements are NOT observed in this reaction type.

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The result of a chemical reaction or a process stage is a product (reaction product). a component of the reaction or mechanism stage that is not a substrate, reactant, reagent, beginning substance, or starting combination.

The organisms that result from chemical interactions are called products.  Reactants undergo a high energy transition stage during a chemical process before becoming products. The reactants are consumed as a result of this process. It can occur spontaneously or be facilitated by catalysts, which reduce the energy of the transition state, and solvents, which provide the favorable molecular conditions for the reaction to occur.

Even in the case of reversible reactions, it is customary to draw products on the right side of chemical equations. Several characteristics of a chemical reaction, such as whether the reaction is exergonic or endergonic, are determined by the properties of products, such as their energies.

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Answer:

After the reaction, there will 0.60 g of magnesium oxide and 0.25 g of oxygen gas present in the tube

Explanation:

Equation of the reaction between magnesium and oxygen is given as follows:

2Mg(s) + O₂(g) ---> 2MgO(s)

From the equation of reaction, 2 moles of magnesium reacts with i mole of oxygen gas to produce 1 mole of magnesium oxide

molar mass of magnesium is 24.0 g; molar mass of oxygen gas = 32.0 g; molar mass of magnesium oxide = 40.0 g

Therefore 24 g of magnesium reacts with 32 g of oxygen gas

I.00 g of magnesium will react with (24.0 / 32.0) * 1.00 g of oxygen = 0.75 g of oxygen gas.

Therefore, magnesium is the limiting reagent. Once it is used up, the reaction will stop and the excess oxygen will be left in the tube together with the product, magnesium oxide.

mass of excess oxygen = 1.00 - 0.75 = 0.25 g

mass of magnesium oxide formed = (24.0 / 40.0 g) * 1 = 0.60 g

His blood volume will increase and its osmolarity will decrease after administering 5 liters of 300moS fluid.

Osmoles of solute per liter of solution serve as a quantitative unit for expressing the concentration of osmotically active particles in solution, or osmolarity. The term "osmolality" refers to the quantity of solute particles per liter of solution, and it is commonly stated in terms of osmoles per liter (Osm/L) or milliosmoles per liter (mOsm/L).

The direction of fluid transport within an organism can be determined by the plasma osmolality and oncotic pressure, therefore it's critical to have emergency care on hand in case it's required during labor and after delivery. Insufficient blood flow to bodily organs causes postpartum hemorrhage (PPH), which can result in shock and death.

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Answer:

a

Explanation:

The main subject of study in thermodynamics is the energy changes in a reaction or a system.

Generally speaking, thermodynamics is a branch of science that deals with the study of heat, work, temperature, and the energy of systems and how this energy is converted from one form to another. The subject of thermodynamics is governed by a series of laws known as the law of thermodynamics.

The correct option is a.