Determine the freezing point of a solution that contains 78. 8 g of naphthalene (C10H8, molar mass = 128. 16 g/mol) dissolved in 722 mL of benzene (d = 0. 877 g/mL). Pure benzene has a melting point of 5. 50°C and a freezing point depression constant of 4. 90°C/m. 0. 74°C4. 76°C4. 17°C1. 68°C1. 33°C

The dependent variable in the experiment  is the ice and water.

The independent variable is amount of water or ice added.

The dependent variable in any experiment is the variable that is being measured or tested in an experiment.

An experiment can be described as a procedure carried out under controlled conditions in order to discover an unknown effect or law, to test or establish a hypothesis, or to illustrate a known law.

An independent variable in an experiment is described as a variable that stands alone and is not changed by the other variables you are trying to measure.

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Counting via way of means of Tens with numbers method 10, 20, 30, 40, 50, 60, 70, 80, ninety and so on.

Ask them to circle all of the tens, 10, 20, 30 . . . Ask the youngsters to have a take a observe the numbers they've rotated and notice down some thing they notice. For example, all of them result in zero, the tens pass up in ones. Ask the youngsters to remember out loud in tens, from 10 to 100.22.

When we remember via way of means of tens the price that we're growing various is via way of means of a unit of ten. That's why the tens column seems like it's far growing via way of means of one wide variety whenever while without a doubt it's far growing via way of means of one unit of ten.

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After one half life, 50% of the atoms will change to a stable isotope.

After one half life, 50% of the atoms will remain radioactive.

After three half lives, 87.5% of the atoms will change to stable isotope.

After three half lives, 12.5% of the atoms will remain radioactive.

When the initial value of any compound is 100%, after one - half it will reduce to 50%, after the second half -life, it will reduce to 25%, after third half it will reduce to 12.5%.

Half- life may be described as the time required for the radioactivity of a specified isotope to drop to half its initial value.

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The mass of plutonium that will remain after 1000 years if the initial amount is 5 g when the half life of plutonium-239 (239pu, pu-239) is 24,100 years is 2.5 g

The equation is Mr=Mi(1/2)^n

where n is the number of half-lives

Mr is the mass remaining after n half lives

Mi is the initial mass of the sample

To find n, the number of half-lives, divide the total time 1000 by the time of the half-life(24,100)

n=1000/24100=0.0414

So Mr=5x(1/2)^1=2.5 g

The mass remaining is 2.5 g

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The kind of stars that creates heavier elements such as copper and zinc is the first-generation stars. More specifically, the explosions (supernovae) that these stars underwent.

The first-generation stars were the stars that were formed after the Big Bang happened. These stars consisted mainly of hydrogen and helium. When these stars exploded in supernovae, that explosion creates some heavier elements that exist in the universe, such as copper and zinc.

The stars that came after the first generation, the second-generation stars like our Sun, contain these heavy elements. Since these elements can't exist purely from the nuclear fusion inside stars, they must have come from the supernovas.

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The atomic number is the total number of protons of an atom, while the mass number is the total number of its protons and neutrons.

An atom has properties and masses that are unique to each other. With the discovery of the particles that make up the atom known as atomic number (Z) and mass number (A).

ᵃz X

A = mass number

Z = atomic number

X = element symbol

The atomic number (Z) indicates the number of protons (positive charge) or the number of electrons in the atom. This atomic number is a characteristic of an element. Because the atom is neutral, the number of protons equals the number of electrons, so the atomic number also indicates the number of electrons.

The mass number is usually given the symbol A. This mass number is used to determine the number of nucleons in an atom of an element. The nucleon itself is a particle that makes up the atomic nucleus consisting of protons and neutrons.

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The correct answer is option B.

The substrate that enters the citric acid cycle is called pyruvate.

What is citric acid cycle?

In Biology, Citric acid cycle is a series of multiple chemical reactions and is also called Krebs Cycle.

Generally, the cycle consists of eight exclusive steps including hydration, dehydration, redox, and decarboxylation reaction.

When cycle completes one turn one molecule of GTP or ATP is formed along with three molecules of NADH and 1 molecule of FADH2. Later on, these molecules are used in cellular respiration process.

To put it simply, citric acid cycle is a chemical reaction in which acetyl CoA is oxidized to release energy.

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The source of the strength exchange in a chemical response: the primary contribution to ΔH is the difference inside the bond energies of reactants and merchandise.

A chemical reaction is a procedure that leads to the chemical transformation of 1 set of chemical materials to another. A chemical reaction is a technique wherein reactants react chemically and convert into products by using chemical transformation. as an instance, in the respiratory – we inhale oxygen which reacts with glucose and produces carbon dioxide, water, and electricity.

A chemical reaction is a method wherein one or more substances, the reactants, are converted to at least one or more exclusive materials, the goods. substances are both chemical elements or compounds. Chemical reactions permit dwelling matter (cells, animals, people, insects) to grow, increase, reproduce, and adapt.

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Plants use sunlight and cellular respiration to transform carbon dioxide into the hydrocarbon molecule glucose, which is then ingested by the plants.

During photosynthesis, oxygen and glucose are created from water and carbon dioxide; the plant uses the glucose and produces oxygen as a waste product.

In the process of cellular respiration, oxygen & glucose are transformed into carbon dioxide and water. Carbon dioxide, water, & ATP, which would be converted into energy, are the process' byproducts.

The main purpose of photosynthetic is to transform chemical energy into solar energy, which is then stored for future use. This mechanism primarily provides energy to the planet's life systems.

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The molar concentration of OH⁻ (aq) in the resulting solution is  0.28 M.

Molarity is a measure of the concentration of a chemical species, especially a solute, in solution and is expressed as the amount of substance per unit volume of solution. The most commonly used unit of molarity in chemistry is moles per liter using the SI unit symbols mol/L or mol/dm³.

For the given question:

Initial concentration of  KOH = M₁ (0.25 M)

Initial volume of KOH = V₁ (40.0 ml or 0.04 L)

Initial concentration of  KOH = M₂

Final volume of solution = V₂ (40.0 + 60.0 = 100ml or 0.1 L)

Since, M₁V₁ = M₂V₂

0.25 × 0.04 =  0.1 M₂

M₂ = 0.1 M

Final molar concentration of KOH is 0.1 M

KOH ⇄ K⁺ + OH⁻

As the moles of K⁺ and OH⁻ on dissociation is same as KOH, so the concentration of OH⁻ will be 0.1 M as well.

Now final concentration of Ba(OH)₂

M₁V₁ = M₂V₂

0.15 × 0.06 = 0.1 M₂

M₂ = 0.09 M

Final molar concentration of Ba(OH)₂ is 0.09 M

Ba(OH)₂ ⇄ Ba⁺ + 2OH⁻

As the above reaction indicates moles of OH⁻ are twice as that of  Ba(OH)₂. So, the molar concentration of OH⁻ will be twice the concentration of Ba(OH)₂, i.e. 2 × 0.09 = 0.18

Now the total molar concentration of OH⁻ will be:

= 0.1 + 0.18

= 0.28 M

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The key properties a solvent which needs to be suitable for use in recrystallization is that recrystallization solvent not react with the solid sample which taken as a sample for the purification.

Impure crystals can be purified by recrystallization with the help of suitable

solvent. This process is basically depends on two facts one is that most of the compounds are more soluble in the hot solvents as compared to cold ones, and impurities must have solubilities different from those of the given desired compound.

Three key properties of a good recrystallization solvent are as listed below:

. The recrystallization solvent not react with the solid sample which taken as a sample for the purification.

. The solvent must be inexpensive, volatile, and non-inflammable.

. The solvent either dissolve the impurities or not at all. If in case solvent dissolves the impurities which is present in a solid sample, then the impurities acts like that it is not present in the crystal structure of the solid. If in case solvent does not dissolve the impurities in it but dissolve the desired solid, then the impurities is easily removed by filtration techniques.

Thus, we concluded that the key properties a solvent which needs to be suitable for use in recrystallization is that recrystallization solvent not react with the solid sample which taken as a sample for the purification.

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Entropy, from lowest to highest entropy will be CuO (s) < H₂O (l) < H₂O₂ (l) < H₂O (g) The highest entropy is in gases. This is due to the wide variety of microstates in which gases can reside.

Higher entropy is a result of more moles on the product side. When a reaction contains numerous phases, the generation of a gas often leads to a far greater increase in entropy than any increase in the number of moles of a liquid or solid.

The physical state with the lowest entropy is the solid state. Because entropy is a measure of unpredictability, this is the case. Molecules cannot move as easily in the solid state as they can in the liquid and gaseous phases.

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question:

Arrange the following from lowest to highest entropy: H,0(), H,O2(0 H20(g), CuO(s). Assume 1 mole of each at the same conditions. from lowest to highest entropy Drag and drop your selection from the following list to complete the answer: H20(e) H20(g) CuO(s) H202(e)

Since there are four groups encircling the sulfur atom, the electron geometry is tetrahedral ( 2 lone pairs and 2 hydrogens)

Tetrahedral electron geometry exists. The shape of molecules is warped.

Due to the lone pair repulsion of the S-H bonds, the molecular geometry of hydrogen sulfide I discovered to be bent (which I had not came across in uniform for some reason), and the angle will be significantly less than 109.5 degrees, about 92 degrees.

It would bend due to the two bonds and two unshared pairs in the center atoms. The atom would only need to be in two bonding areas to be considered linear.

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The liquid shown in 'b' need more thermal energy to change to a gas.

Thermal energy is defined as internal energy which is present in a system in state of the thermodynamic equilibrium depending on its temperature. Thermal energy can not be converted into useful work as much easily as the system energy which are not in states of the thermodynamic equilibrium.

As we can see that at same temperature in image 'a' the particle have high kinetic energy than the molecules of image 'b'. This can be shown that the boiling point of image 'a' is lower than the image 'b'. Therefore, at lower temperature it boils faster than the liquid 'b'. Thus we can say that liquid 'a' has less thermal energy than 'b'.

Thus, we concluded that the liquid shown in 'b' need more thermal energy to change to a gas.

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The essential health benefits of the Affordable Care Act include preventive care, emergency services, hospitalization, prescription drugs, mental health services, and pregnancy care.

For households earning below 100% - 400% of both the federal poverty threshold, the law offers customers subsidies (referred to as "premium tax credits") that reduce prices (FPL). Increase Medicaid coverage to include all adults with incomes below 138% of the federal poverty level.

Obamacare allows people to purchase health insurance regardless of their financial level. You may be eligible for a prescription tax credit or other special discounts that will lower the cost of your health insurance if your family income between 100% or 400percent of total of both the federal poverty threshold (FPL).

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Based on the data provided:

The variables in an experiment are those factors or quantities that can be changed or controlled by the researcher while conducting the research.

There are three types of variables in an experiment:

An experiment usually states a hypothesis that is tested.

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The net ionic equation for the reactions that occur :-

[tex]SO {4}^{2-} (aq.) + Ba^{2+} (aq.) ----- &gt; BaSO{4} (s)[/tex]

The spectator ions are:[tex]K^{+} \\and \\NO_{3}^{-}[/tex]

Net Ionic Equation:- An equation that only shows the ions or molecules that are actively contributing to the reaction or those that change is called net ionic equation.

Spectator ions:- Spectator ions may be either cations (positively-charged ions) or anions (negatively-charged ions). The ion is unchanged on both sides of a chemical equation and does not affect equilibrium. When writing a net ionic equation, spectator ions found in the original equation are ignored. Thus, the total ionic reaction is different from the net chemical reaction.

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Hello..!

The time the meteor will take to reach Earth will be approximately 3.4 minutes.

Journey duration

The duration time is given by the ratio between the distance traveled and the speed of displacement of the object, that is:

[tex]\begin{gathered}\large\begin{array}{lr}\bf \red T = \dfrac{ \blue{d}}{ \blue{v}} \end{array}\normalsize\begin{cases}\bf{ \red{T}}\Rightarrow \textsf{ \green{Time }}\\\textbf{\red{d}}\Rightarrow \sf \green{Distance}\\\textbf{\red{v}}\Rightarrow \textsf{ \green{Speed}}\end{cases}\end{gathered}[/tex]

In the case of this problem, the time found will be in seconds, since the displacement speed is defined in km/s.

Applying the information in the formula:

[tex]\sf\red{D} \orange{\longmapsto} \blue{409km}[/tex]

[tex]\sf \red{V} \orange {\longmapsto} \blue{ 2km/s}[/tex]

[tex]\begin{gathered}\begin{array}{l}\bf T=\dfrac{409km}{2km/s}\\\\\large\boxed{\bf T = 204.5~seconds}\\\\ \large\text{$\bf ou$}\\\\\bf T = 204.5 \div 60\\\large\boxed{\bf T \approx 3{,}4~minutes}\end{array} \end{gathered}[/tex]

Thus, the impact will be in 204.5 seconds or 3.4 minutes, approximately

[tex]\begin{gathered}\rule{7cm}{0.01mm}\\\texttt{Good studies! :D}\\\rule{7cm}{0.01mm}\end{gathered}[/tex]

The molecular solubility of li3po4 in water is 7.52*10^−3 M.

Here, we have been told that the solubility product constant of li3po4 is = 3.2*10^-9 (i)

We know that the molecular stability of an ionic compound is defined as the concentration of the compound dissolved in the solution. We can calculate the molecular stability of the given ionic compound li3po4 by using the solubility product given.

= {Li] = {PO} = S

= 3.2*10^-9 = S^3-S

= S^4= 3.2*10^9

= S = 7.52*10^−3 M.

Therefore, the molecular stability of the given ionic compound li3po4 is 7.52*10^−3 M.

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The percent by mass of copper to alloy is 8.0%.

The relative proportions of each element in a compound are shown by the percent composition. The formula for mass percent for each element is:

mass percent = (Mass of Solute / Mass of Solution) x 100%

Typically, grams are used as the unit of mass. The term mass percent is sometimes referred to as weight percent or w/w%. The total mass of all the atoms in a mole of the compound is the molar mass. The total of all the mass percentages ought to equal 100 percent.

We know that,

the percent by mass = (mass solute/mass solution) × 100

Given,

Mass of copper = 8.0g

Mass of alloy = 100g

the percent by mass = (8.0 g / 100 g) × 100

percent by mass = 8.0%

Thus, the percent by mass of copper to alloy is 8.0%.

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Answer: the answer would be C

Explanation:

I took the test

Process that involves in converting soil into metamorphic rocks is generally by heating.

Metamorphic rocks are formed when the general rocks are subjected to high heat, mineral rich fluid, high pressure etc. Some examples of metamorphic rocks are gneiss, slate, marble, schist, and quartzite. Slate and quartzite tiles are used in building construction

Process of formation of metamorphic rocks is not by melting the rocks, but instead make them into more denser forms. For which these rocks are subjected to very high temperature and pressure to make them more dense.

Metamorphic rocks are often squished, smeared out, and folded. Despite these uncomfortable conditions, metamorphic rocks do not get hot enough to melt, or they would become igneous rocks!

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Answer: Sodium Chloride has nothing in common with sodium or chlorine

Explanation:

I hope this helped ;)

When nitrogen gas and hydrogen gas combine, there is the formation of ammonia as a product.

A reaction that produces fire and occurs at a high temperature is referred to as a combustion reaction. An exothermic, redox reaction known as combustion typically takes place between a fuel and primarily oxygen in the environment.

Because this reaction cannot take place in the absence of oxygen, oxygen is the primary reactant in combustion reactions. When a fuel burns through completely, carbon dioxide and heat are produced.

Ammonia was created using the Haber process, which involved the reaction of nitrogen (N2) and hydrogen (H2) to create ammonia (NH3).

N₂   +    3H₂    ⇄    2NH₃,      ΔrH = -92kJ/mol.

Since the enthalpy change for the reaction that produces ammonia is negative, which indicates that energy is released during this process, ammonia formation is also an exothermic process.

Three moles of hydrogen gas and one mole of nitrogen gas combine to make one mole of ammonia.

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The bond typically observed when a metal bonds to a nonmetal is the ionic bond the metal atom loses one or more valence electrons while the nonmetal gain electrons

Covalent bond form between nonmetal and ionic bond form between metal and nonmetal and metallic bond form between metal and ionic bonding involves the transfer of electron from a metal to the non metal atom until the outer shell of their resultant atoms are similar to that of a noble gas and the metal lose the electron and form cation while the nonmetal accept the electron and form anion and cation and anion are charged species which are formed by losing and gaining electron respectively to attain the nearest noble gas configuration or stability and usually metal lose their valence electron to form cation while non metal accept electron and form anion

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Database security refers to all the precautions businesses take to guard against hacks into their database management system (DBMS) and every piece of associated software. This involves implementing policies, practices, and tools designed specifically to safeguard the stored sensitive data. Small businesses that manage and collect huge amounts of data should also have database security standards in place because this problem is not just a problem for big businesses.

The finest database security practices listed below can help keep your databases secure from intruders.

In the conventional sense, this entails securing, locking, and providing access controls for your database server to keep away unauthorized visitors. It also entails maintaining the database on a distinct physical system from those used to operate web servers or applications.

A firewall should be used to safeguard your database server against threats to database security because it by default blocks traffic. Only traffic from certain applications or web servers that require access to the data should be permitted. The firewall ought to prevent your database from opening outbound connections unless absolutely necessary.

The database should only be accessible by the fewest individuals feasible. Administrators should only be granted access when they need it and only for as long as they need it to do their duties. Although this may not be feasible for smaller businesses, at the very least permissions should be handled through the use of groups or roles rather than being directly granted.

To safeguard against the most recent vulnerabilities, it's crucial to routinely upgrade your operating system and database software with all security patches installed. Unless there is a compelling reason for any to be disabled, you should also make sure that any database security controls offered by the database are enabled (most are by default).

This entails keeping an eye on logins (and login attempts) to the database and operating system as well as routinely checking logs to look for unusual activity. To inform the appropriate team members when potentially dangerous activity is found, you may also generate alerts.

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Atomic radius of an argon atom in FCC unit cell is 185 picometer.

Density of argon = 1.83 g/[tex]cm^{3}[/tex] and atomic mass of Argon = 40

density (d) = [tex]\frac{n . M}{a3 . Na}[/tex]

where d= density , n= no. of atoms present M = atomic mass , a3 = volume, Na = Avogadro's constant

a3 = [tex]\frac{n . M}{d . Na}[/tex]  

a3 = 4 x 40 / 1.83 x 6.023 x [tex]10^{23}[/tex]

= 14.51 x [tex]10^{-23}[/tex]

=145.1 x [tex]10^{-24}[/tex] = a3

a = 5.25 x [tex]10^{-8}[/tex] cm

a= 0.525 x [tex]10^{-7}[/tex] nm

For FCC unit cell  [tex]\sqrt{2a}[/tex] = 4r

r =[tex]\sqrt{2a}[/tex] / 4

= 1.41 x 0.525 / 4

= 0.185 nm

= 185 picometer

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F is the most electronegative atom on the Periodic Table, and electronegativities rise from the bottom to the top of the Group.

In comparison to water, the halogens are substantially more soluble in organic solvents like hexane. Since neither hexane nor the halogens are polar, van der Waals dispersion forces are the only intermolecular interactions acting between them.

The capacity of an atom to attract electrons to itself is known as electronegativity. Halogens have a strong attraction to electrons and hence have high electronegativity values because they only require one electron to complete an octet.

Although polar by nature, alkyl halides are very insoluble in water.

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Transfer RNA (tRNA) carries and places amino acids in the correct locations during protein synthesis.

The term "RNA" stands for ribonucleic acid, a complex substance with a high molecular weight that is used in the creation of proteins in cells and, in some viruses, takes the role of DNA (deoxyribonucleic acid) as a carrier of genetic information. The building blocks of RNA are ribose nucleotides, which are joined by phosphodiester linkages to form strands of various lengths.

Messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA), which are found in all organisms, are the three most well-known and often investigated. Similar to enzymes, this and other varieties of RNA largely carry out biochemical processes. However, some also play intricate regulatory roles in cells. RNAs have significant roles in both healthy cellular processes and illnesses due to their engagement in several regulatory processes, their quantity, and their variety of functions.

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