Help me with this answer please

At 50 degrees Celsius, potassium chloride is soluble in 43.0 grammes per 100 grammes of water.

The solution to the issue gives you the solubility of potassium chloride, KCl, in water at 20°C, which is stated to be 34 g/100 g H2O. For every 100 g of water in a saturated potassium chloride solution at 20 °C, 34 g of dissolved salt will be present.

The solution to the issue gives you the solubility of potassium chloride, KCl, in water at 20°C, which is stated to be 34 g/100 g H2O.

The amount of a material that can dissolve completely in a solvent at a specific temperature is known as its solubility. A saturated solution is one such example. 

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Answer:

200g/dm3

Explanation:

100cm3  needs to be converted into dm3

cm3 ⇒ dm3= ÷1000

[tex]\frac{100}{1000\\}[/tex]= 0.1

To find the concentration we need to follow the formula:

C=[tex]\frac{m}{v\\}[/tex]

C=[tex]\frac{200}{0.1}[/tex]

C= 200g/dm3

Both the hydrogen and carbon atoms are present in every macromolecule.

The molecules made up of smaller units are referred to as macromolecules. They are referred to as monomers. The macromolecules that are relevant to this discussion are those that may be present in the human body.

As we can see, biological macromolecules are frequently quite big. This is due to the fact that macromolecules often consist of a large number of units linked together. To create the macromolecules of proteins, lipids, carbohydrates, and nucleic acids, thousands of monomer molecules are bonded together.

The carbon atom and the hydrogen atom are present in every macromolecule. These are present in every macromolecule. The carbonyl bond is present because the carbs are lowering sugars. Lipids, nucleic acids, proteins, and amino acids do not undergo carbonyl reduction processes because they do not contain a carbonyl group.

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The change in temperature of the system is 2.28 °C.

The change in temperature of the system depends on the heat released. The total heat received by the system will equal to total heat released by objects. It should follow

Q released = Q received

The heat can be defined by

Q = m . c . ΔT

where Q is heat, m is mass, c is the specific heat constant and ΔT is the change in temperature.

The given parameters are

Q = 75.4 J

n = 0.25 mol

Mr CCl₄ = 153.8 g/mole

c = 0.861 J / g. °C

Find the mass of CCl₄

n = m / Mr

0.25 = m / 153.8

m = 38.45 grams

Find the change in temperature

Q = m . c . ΔT

75.4 = 38.45 . 0.861 . ΔT

ΔT = 2.28 °C

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Answer: I love rats u love rats? HB dogs ? or do you like cats I have a Persian cat and 1 ginger cat his name is ginger Vitus but you can call him ginger or Ginga or bitus and I feed them tuna and cat food do you

The entire reaction equation for the thermal decomposition of (CaC2)[tex]O^{4}[/tex]. [tex]H_{2}O[/tex] is shown below. to make calcium oxalate that is anhydrous.

Water is lost by crystallisation in step 1. Step 2 involves converting calcium oxalate thermally to calcium carbonate while releasing carbon monoxide.

They can be categorised as calcium oxalate if they are insoluble in caustic alkali and acetic acid, soluble in hydrochloric and sulfuric acid without effervescence, and show a progressive separation of needle-like calcium sulphate crystal when mixed in a 50% sulfuric acid solution.

It burns in pure oxygen or air to form the oxide and reacts quickly with warm water to create calcium hydroxide and hydrogen gas (and more slowly with cold water). Calcium reacts when heated with boron, carbon, sulphur, phosphorus, halogens, and hydrogen.

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The empirical formula of the sample is KCrO₄

Given that :

Potassium , K = 2.087 g

molar mass of potassium = 36 g/mol

Chromium , Cr = 2.775 g

molar mass of chromium = 52 g/mol

Oxygen , O =  2.988 g

molar mass of oxygen = 16 g/mol

the number of moles of potassium = mass / molar mass

                                                          = 2.087 / 36

                                                          = 0.05 mol

the number of mole of chromium = mass / molar mass

                                                        = 2.775 / 52

                                                         = 0.05 mol

the number of moles of oxygen = mass / molar mass

                                                     = 2.988 / 16

                                                     = 0.18 mol

now diving by the smallest number, we get

moles of K = 1

moles of Ce = 1

moles of O = 4

the empirical formula for the sample is  KCrO₄

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Protozoans, fungi, algae, lichens, mosses and ferns are the example of a simple organisms.

An organism is a collection of molecules working to together form a mostly stable whole that demonstrates the characteristics of life. With phrases like "any sense of life, such as with a plant, animal, fungus, or bacterial, capable of growth & reproduction," dictionary definitions are very general.

A living creature with a organized approach, is capable of responding to stimuli, can reproduce, develop, adapt, and preserve homeostasis is referred to as an organism. Therefore, every animal, plant, fungi, protist, microbe, or archaeon found on Earth would be considered a life.

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The number of moles of HCl produced along with the 2.9 moles of H₃PO₄ is 14.5 moles

From the question, we are to determine the number of moles of HCl that are produced along with 2.9 moles of H₃PO₄

The given balanced chemical equation of the reaction is

PCI₅ + 4H₂O ---> H₃PO₄ + 5HCI

From the balanced chemical equation,

1 mole of PCI₅ reacts with 4 moles of H₂O to produce 1 mole of H₃PO₄ and 5 moles of HCI

Now,

If 2.9 moles of H₃PO₄ are produced from the reaction,

Then,

5 × 2.9 moles of HCl will be produced along with the H₃PO₄

5 × 2.9 =  14.5 moles

Hence, the number of moles of HCl produced is 14.5 moles

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In the scientific notation, the number that we obtain is 4.6 * 10^-10.

We know that in science we often have to deal with very large figure and these figures that we deal with could be quite cumbersome to handle. As such, it is important that we are able to devise a system that can help us to be able to write these values in a way that is simple and this is the origin of the use of the scientific notation.

The scientific notation can help us to be able to shorten the bulk of the figures tat we need to write. In this case we have the figures; 2.3 * 10^-4 * 2.0 * 10^-6 = 4.6 * 10^-10

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Product identifier or name information about safe handling practices, Make utilize the MSDS (Material Safety Data Sheet).

Verb: required, requireding. Used with object. to be in need; to require: He needs medical attention. to authoritatively request; command or compel to perform an action: to demand that an agent account of money spent. to demand anything with authority or urgent.

The primary distinction between a need and a requirement is that a need refers to the aims and objectives that a business must accomplish, whilst a requirement refers to the actions we must do to fulfill a need. The terms "need" and "requirement" are occasionally used interchangeably.

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Answer:

2NaCl + F2 -> 2NaF + Cl2

Explanation:

Answer:

2NaCl +F2 = 2NaF + Cl2

reactant product

Na=2 Na=2

Cl=2 Cl=2

F=2 F=2

Uneven distribution of the bond's electrons leads to the formation of polar covalent bonds

What is a covalent bond?

The exchange of one or more pairs of electrons between two atoms forms a covalent connection. The two atomic nuclei are drawing these electrons in unison. When there is insufficient space between two atoms' electronegativities for an electron transfer to take place and create ions, a covalent bond is formed.

Hence, uneven distribution of the bond's electrons leads to the formation of polar covalent bonds

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This body part in squid allows them to propel themselves rapidly by sucking in through the mantle and out through the siphon.

The siphon is a large tube at the bottom of the giant squid's body and allows it to move. The giant squid draws air into a siphon and pushes the air out to propel itself forward.

Squids have a tubular bodies and small rod-like internal structures called pens, which help support the squid's body. The mantles help protect the cavity of the squid, as well as help it move, as they suck water in and then push it out.

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Cobalt-60 is a radioisotope that decays by first order kinetics with a half life of 5. 26 years. When used in radiotherapy, a cobalt-60 unit is replaced when the concentration of co decreases to 75% of its initial value it occurs in 2.18 years.

Given that :

t1/2 = 5.26 years

k t1/2 = 0.693

k = 0.693 / 5.26

k = 0.132 yr^-1

ln ([A]t / [A]o) = - kt

[ Co ] = 0.75 [Co]

ln ( 0.75 [Co] / [Co]o) = - (0.132 yr^-1) t

ln 0.75 = - (0.132 yr^-1) t

-0.288 = - (0.132 yr^-1) t

t = - 0.288 / - (0.132 yr^-1)

t = 2.18 yr

Thus, Cobalt-60 is a radioisotope that decays by first order kinetics with a half life of 5. 26 years. When used in radiotherapy, a cobalt-60 unit is replaced when the concentration of co decreases to 75% of its initial value it occurs in 2.18 years.

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Relationship between resistance and current in a circuit is current is inversely proportional to the resistance

The relationship between current and voltage, resistance is expressed by ohm's law and this states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit and provided the temprature remain constant and hence the relationship between current and resistance could be written as I = VR for constant value of voltage and the current is inversely proportional to the resistance

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The balanced equation for the combustion of isooctane to yield CO₂ and H₂O is

2CH₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

When a substance combines with oxygen gas, it releases energy in the form of heat and light, which is known as a combustion reaction.

When a substance burns in the presence of oxygen, heat and light are produced as a result. This process is referred to as combustion. You may have heard that while some compounds are non-combustible, others are combustible. Simply said, combustible materials go through this procedure.

A lit match is a common illustration of a combustion reaction. A flame is produced when a match is struck because friction heats the head to a temperature where the chemicals react and produce more heat than can be released into the atmosphere.

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The lewis structure for Chlorine dioxide is present in the attachment.

Lewis structure: The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure. It is used to demonstrate how the electrons in a molecule are positioned around particular atoms. When two atoms are bonded together, electrons are depicted as "dots" or as a line.

Octet rule: The octet rule describes an atom's propensity to favor eight electrons in its valence shell. Atoms with fewer than eight electrons are more likely to interact with one another and create more stable molecules.

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The anti-periplanar conformations that rise to cis and trans alkenes have energies that are 1:3 apart.

The chemical substance known as an alkene, also known as an olefin, is one that exclusively contains hydrogen and carbon atoms and has at least one double bond between them. With just a double bond and no additional functional groups, the simplest alkenes combine to produce a coordination complex of hydrocarbons with general formula CnH2n.

Elimination processes, which remove two atoms from adjacent carbon atoms to create a double bond, are typically used to create alkenes. Dehydration of alcohols, dehydrohalogenation on alkyl halides, and dehalogenation of alkanes are all steps in the preparation process.

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An element with the smallest anionic (negative-ionic) radius would be found on the periodic table in group 17 , period 2.

The elements in the periodic table are arranged in the order of the increasing atomic number . the elements are arranged in the groups and the periods in the periodic table. the atomic radius increases as we move from top to bottom in the group and the atomic size decreases as we move from left to right in period in the periodic table.

the ionic radius increases as we move top to bottom in the periodic table and as we move in the periodic table the ionic radius decreases. so, the element with smallest anionic radius is in group 17 and period 2.

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Balance the neutralization reaction of phophoric acid with magneium hydroxide  is 2 H₃PO₄ + 3 Mg(OH)2 ⇒ Mg₃(PO₄)₂ + 6H₂O

This reaction is known as a neutralization reaction because the acid and base react to form a salt and water by-products. Phosphoric acid reacts with  magnesium hydroxide to produce Magnesium phosphate and water.

A chemical reaction is balanced when there are equal amounts of each element on both sides of the equation.

Therefore, balance the neutralization reaction of phosphoric acid with magnesium hydroxide  is 2 H₃PO₄ + 3 Mg(OH)2 ⇒ Mg₃(PO₄)₂ + 6H₂O

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The correct oxidation numbers are as follows;

Oxidation states or oxidation numbers are the hypothetical charges of atoms when all bonds to various atoms are fully ionic. Represents the degree of oxidation of atoms in a compound. Conceptually, the oxidation state can be either positive, negative, or zero.

The oxidation number of an atom indicates how many electrons the atom gained or lost when the substance was formed.

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The electoral college system creates a population inequity in presidential elections because under the constitution large stated are untitled to fewer electors president then smaller states

The electoral college is the process we use to elect the US president and established in the US constitution and it purpose is to spread the power elect the president across all 50 stated and it was designated to ensure that the more populous state didn't overpower the smaller states when choosing the nation leader and total 538 elector form the electoral college and each elector cast one vote following the general election and the candidate who get 270 votes more win and the newly elected president and vice president are then inaugurated

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The four sections of the pivot table—Report Filter, Column Labeling, Row Labels, and Values—are located at the bottom of the Self - configuration Field List window.

One of the fundamental tools for data is the pivot table. Many significant business concerns can be swiftly resolved with pivot tables.

Pivot Tables can be thought of as a form of visual storytelling even if they are merely tables and lack real graphics.

Most tools demand the somewhat tedious process when comparing two Table or merging them. With some exclusions, like Lumeer, numerous Pivot Table that have the same structure can be laid over.

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Answer:

64.6 in (164 cm)

Explanation:

Answer:5’7

Explanation:

The ph of the solution after the addition of 100. 0 ml of HNO3 is 5.6. In a 100. 0 ml sample of 0. 10 m NH3 is titrated with 0. 10 m HNO3.

Ions with a positive charge are called cations. Ions with negative charge are called anions. Ionic molecules or atoms are charged. A balanced atom will become a positively charged cation if it loses one or more electrons. An anion is a negatively charged atom that develops when a balanced atom acquires one or more electrons.

Reaction: HNO₃(aq) + NH₃(aq) → NH₄NO₃(aq) +H₂O(l)

                                                 NH₄⁺ (aq) + NO₃⁻(aq)

                NH₄⁺(aq) + H₂O (aq) ⇆ H₃O⁺(aq) + NH₃(aq)

Mol NH₃ = 0.10 mol/L × 100 mL × 1 L/1000 mL = 0.01 mol

Mol HNO₃ = 0.10 mol/L × 100 mL × 1 L/1000mL = 0.01 mol

Mol NH₄NO₃ produced = 0.01 mol NH₄NO₃

Mol HNO₃ left = 0.01 - 0.01 = 0 mol

Hydrolyzing NH₄⁺ and applying ICE approach

           NH₄⁺ --> H⁺ + NO₃⁻

I            0.01       0        0

C           -x          +x      +x

E        0.01-x       x        x

Kh = Kw/Kb = [H⁺][NO₃⁻]/[NH₄⁺]

10⁻¹⁴/1.8×10⁻⁵ = [x][x]/[0.01-x]

Solving for x,

x = [H⁺] = 2.357×10⁻⁶ mol

The formula for pH is

pH = -log [H⁺]

Aside from 2.357×10⁻⁶ mol, let's add the H⁺ from the remaining HNO₃ which is 0.

Therefore,

pH = -log[2.357×10⁻⁶ mol + 0 mol]

pH = 5.6

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Answer:

3CO + Fe₂O₃ = 2Fe + 3CO₂

The amount of Sr90 remained after a) 19 a is 0.625 x 10^-6 g and after 75 a is 0.157 x 10^-6 g. This emission is known as radioactive decay.

What is radioactive decay?

Radioactive decay is a process in which any unstable nucleus loses its energy in the form of radiation. Different types of decays include beta decay, alpha decay and gamma decay in which there is a loss of one or more molecule in the form of radiation.

In radioactive decay,  half life of any atomic nuclei is  the time in which the nucleus becomes half of its initial mass.

λ = 0.693 / t1/2 = 0.693 / 28.1 per year.

t = [2.303 /λ] * log [a / a-x]

a) 19 = [2.303/ 0.693] * 28.1 * log [10^-6 / a-x]

0.203 = log [10^-6 / a-x]

a - x = 0.625 x 10^-6 g

b) 75 = [2.303/ 0.693] * 28.1 * log [10^-6 / a-x]

0.803 = log [10^-6 / a-x]

a - x = 0.157 x 10^-6 g

Therefore, the amount of Sr90 remained after a) 19 a is  0.625 x 10^-6 g and after 75 a is 0.157 x 10^-6 g. This process is done by beta decay.

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325 million is the approximate population of the united states today.

Official Name: United States of America

Population: 324, 057, 300

Form of Government: Constitution-based federal republic

Capital: Washington, D.C.

Area: 9, 826, 630 square km

Major Mountain Ranges: Rocky Mountains, Appalachian Mountains

Major Rivers: Mississippi, Missouri, Colorado

Languages: English, Spanish

Money: U.S. dollar

Native Americans inhabited the enormous area that would become the United States of America for many millennia. Some of these native tribes roamed the vast continent at will, while others established sizable permanent settlements in certain locations.

Each of these tribes created their own cultures, festivals, and rituals. As a way to honor their culture and identity, many aboriginal people still precise these rituals today.

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Redox (Oxidation-Reduction) (Oxidation-Reduction) Al2(SO4)3 + H2 from the reaction Al + H2SO4 may be a redox reaction.

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