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A student measures the mass of a bag of sand to be 9,321 g. What is the bag's mass
in kg?

The molality of a solution prepared by dissolving diethyl ether is 2.76 m.

m(C₄H₁₀O) = 86.9 g; mass of diethyl ether

M(C₄H₁₀O) = 74.12 g/mol; molar mass of diethyl ether

n(C₄H₁₀O) = m(C₄H₁₀O) ÷ M(C₄H₁₀O)

n(C₄H₁₀O) = 86.9 g ÷ 74.12 g/mol

n(C₄H₁₀O) = 1.17 mol; amount of diethyl ether

m(C₆H₆) = 425 g = 0.425 kg; mass of benzene

b = n(C₄H₁₀O) ÷ m(C₆H₆)

b = 1.17 mol ÷ 0.425 kg

b = 2.76 mol/kg;  the molality of a solution

Molality is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent.

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Answer:

Alkynes

Explanation:

Alkynes are hydrocarbons which contain carbon-carbon triple bonds. Their general formula is CnH2n-2 for molecules with one triple bond (and no rings). Alkynes undergo many of the same reactions as alkenes, but can react twice because of the presence of the two p-bonds in the triple bond.

122.67 ml of LiOH are required to reach the halfway point.

The balanced equation for the reaction of lithium hydroxide with the acid:

LiOH + HCOOH → HCOOLi + H₂O

V(HCOOH) = 46.0 ml; volume of the acid

c(HCOOH) = 0.400 M; concentration of the acid

c(LiOH) = 0.150 M; concentration of lithium hydroxide

V(LiOH) = ?; volume of lithium hydroxide

At the halfway point: n(HCOOH) = n(LiOH)

c(HCOOH) × V(HCOOH) = c(LiOH) × V(LiOH)

0.400 M × 46.0 ml = 0.150 M × V(LiOH)

V(LiOH) = 0.400 M × 46.0 ml / 0.150 M

V(LiOH) = 122.67 ml; volume of lithium hydroxide

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The qualities that I think are important for a scientist to have is hard-working, cleverness and perseverance.

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5.8 x 10^²³ atoms of mercury are in a 1.286e1 ml sample. Density is a measure of how tightly a material is packed.

Defined as mass per unit volume. Density symbol: D or ρ Density formula: ρ = m/V, where ρ is the density, m is the mass of the object, and V is the volume of the object.

Data given is:

density of liquid mercury = 13.6g/10 cm³

Volume =1.286x [tex]10^{1}[/tex]mL

Calculation:

we know, 1 mL = 110 cm³

Volume= 1.286x[tex]10^{1}[/tex] cm³

w = Dv

= 13.69g/cm ^ 3 x 1.286 x[tex]10^{110}[/tex] cm³

= 176.05g

Calculate moles of mercury. Molar mass of mercury = 200.5g / mol

No of  moles = 176.05 g / 200.5g/mo|

=0.8776 mol  of Mercury

we know,

I mol = 6.022x10^²³  atom

0.8776 mol= 6:022×10^²³ x0.8776 atom

=5.28x10^²³ atom

=5.8 x 10^²³ atom

=5.8 x 10^²³ atom of Mercury.

Hence, 5.8 x 10^²³ atoms are present in murcury.

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A substance has an extended structure composed of two different elements. The elements are a metal and a non-metal. The property would this substance most likely have is (B) has  a high melting point.

When a metal and a non - metal combine it will  form ionic compound. while when nonmetals combine with other nonmetal it will form covalent compound.

An ionic compounds have high melting point because an electrostatic force between particles is very high and difficult to break. so due to high electrostatic attraction between ions.

Thus, A substance has an extended structure composed of two different elements. The elements are a metal and a non-metal. The property would this substance most likely have is (B) has  a high melting point.

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Element that would have a fixed charge of 2 in an ionic compound is c. Ba.

Barium (Ba) is a metal from the second group of the Periodic table of elements.

Barium looses two electrons and has a fixed charge of 2+ in an ionic compounds.

Electron configuration of the barium atom:

₅₆Ba 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 6s².

For example, in the salt barium chloride (BaCl₂) , barium has charge of 2+.

Aluminium (Al) has charge of 3+.

Potassium (K) has charge of 1+.

Cobalt (K) change charge, it depends of the compound.

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Adding water to each solid quickly separates them; K₂SO₄ is soluble while BaSO₄ is insoluble. K₂SO₄ cannot form a precipitate, whereas BaSO₄ can form a precipitate.

Many factors influence solubility, one of which is lattice energy or the stability of the lattice and bond. The rule now states that bigger anions are stabilized by bigger cations and smaller anions are stabilized by smaller cations.

Since (SO4)²⁻ is a larger anion, the stability of the compound rises as the size of the cation does as we move down the group. As a result, the solubility drops. BaSO₄ is therefore insoluble.

Now, this goes against the trend found for k⁺. K₂SO₄ is an ionic molecule in this instance, and most ionic molecules are soluble in water. Dipoles and the extreme polarity of ionic substances are reasons for their solubility. Although they are held together so firmly that water is unable to separate them, not all ionic substances are soluble in water.

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Answer:

if earth was closer to the sun think about it a magnet the closer the more powerful

follow me;)

The statement that would decrease the gravitational pull between the sun and Earth is as follows:

Thus, the correct option for this question is D.

Gravitational pull may be defined as the methodology through which the force of attraction that bodies apply to one another with respect to their prospective masses.

According to the context of this question, the gravitational pull is strongest when two bodies reside close to one another. But, when they are farther, this force of attraction lowers.

If the sun was twice its size, its gravitational pull strengthen as compared to the earth, while if Earth was twice its size, it is found that the gravitational pull of the earth strengthens.

Therefore, if the sun was farther away from Earth is a statement that would decrease the gravitational pull between the sun and Earth. Thus, the correct option for this question is D.

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The dielectric constant of a binary solvent containing 20thanol in water is

24.55.

A simplified capacitor model can be used to calculate the dielectric constant , which is defined as the ratio of a material's electric permeability to that of vacuum (or free space).

The ratio of a substance's permittivity to the permittivity of empty space (0) is known as the medium's dielectric constant (K). i.e K=ε/ε0. The dielectric constant becomes a dimensionless quantity because the permittivity of the medium and the permittivity of free space have the same units (F/m, or Farad/meter).

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The net ionic equation for the reaction that occurs when aqueous solutions of sodium hydroxide and hydrocyanic acid are combines is

OH−(aq)+HCN(aq)→CN−(aq)+H2O(l)

What is ionic equation?

A chemical equation known as an ionic equation expresses the electrolytes in aqueous solution as dissociated ions.

Deprotonation of the acid by the hydroxide ion from the base occurs when weak acids like hydrocyanic acid are mixed with strong bases like sodium hydroxide. The conjugate base of the acid and water is created as a result of this reaction.

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The chemical basis of molecular hybridization is a. base complementarity.

What is hybridization?

In order to create a new set of equivalent orbitals known as hybridised orbitals, distinct orbitals must be mixed together. Bond formation uses these hybrid orbitals.

Hybridized orbitals are the name given to these novel orbitals. The hybridized orbitals are known as sp3 orbitals because they are made up of one s orbital and three p orbitals. These hybrid orbitals' energies fall between the s and p orbitals' energy levels.

Thus, the basis of molecular hybridization in a chemical compound is base complementarity.

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Dispersion forces are very weak electrostatic attractions that occur due to the random electronic motion within all substances, including - those that are nonpolar.

Dispersion force is also called an induced dipole-induced dipole attraction.

The London dispersion force is the weakest intermolecular force.

The London dispersion force (intermolecular force) is a temporary attractive force between molecules.

Dispersion forces make nonpolar substances (for example oxygen, nitrogen) to condense to liquids and freeze into solids in low temperatures.

In nonpolar bonds the arrangement of electrons are in the middle between two atoms.

For example, nitrogen molecule (N₂) has strong nonpolar triple covalent bond (:N:::N:), that is why it is very stable and have low reactivity.

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Cacl2 has the largest lattice energy.

The lattice energy of CaCl2 is -2195.2 kJ/mol. The calcium salt calcium chloride has a wide range of applications in both home and industrial settings. The molar mass of calcium chloride, which has the chemical formula CaCl2, is 110,983 g/mol. The calcium cation (Ca2+) and two chlorine anions make up an ionic compound (Cl–).
Lattice energy cannot be objectively quantified, although it can be measured using electrostatics or inferred using the Born-Haber cycle.
The size of the ions affects the lattice energy in an inverse manner: the greater the electrostatic attraction between the smaller ions, the greater the lattice energy. Two crucial elements that influence the lattice energy's magnitude are the bonded ions' charge and radius.

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Molarity is defined as the total number of moles of solute dissolved in 1 litre of solution.

The formula of Molarity is =

Molarity = Number of Moles of solute / volume of solution (in L)

Number of moles = Mass / Molar mass

Given,

Mass of NaCl = 25 gm

Molar mass of NaCl= 23 + 35.5

                               = 58.5

So, Number of moles= 25/ 58.5

                                 = 0.427

∴Molarity = 0.427/ 0.3 (in Litres)

              = 1.42 mol/ L

Hence, molarity of the given solution is 1.42 mol/ L.

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Molarity of solution is 1.43 mol/L

The total number of moles of solute dissolved in 1 liter of solution is known as molarity.

The volume of solution divided by the number of moles of solute is known as molarity (volume should be in L)

A measure of the concentration of a chemical species is called molar concentration (also known as molarity, quantity concentration, or substance concentration).

Mass  divided by Molar mass = number of moles

Given,

NaCl weight is 25 gram.

NaCl has a molar mass of 23 + 35.5.

= 58.5

Therefore, number of moles = 25 / 58.5

= 0.43

Molarity = 0.43 / 0.3 (in Liter)

= 1.43 mol/ L

As a result, the supplied solution has a molarity of 1.43 mol/L.

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The magnitude of the component perpendicular to segment BC is 68.0 lb.

Let's take the vectors for points B and C.

rB = [ 3, 4, 0] ft

rC = [ 7, 6, −4] ft

The unit vector going from B to C is then ˆuBC = rC − rB / |rC − rB| = [4, 2, −4] / √(4)^2 + (2)^2 + (−4)^2

Now the dot product of F with ˆuBC to find the component of the force along segment BC of the pipe.

F║ = F · ˆuBC = [30, −45, 50] · [4, 2, −4] / √(4)^2 + (2)^2 + (−4)^2 lb = − 85 / 3 lb

Thus, the magnitude of the component along segment BC is

|F║| = 85/3 lb ≈ 28.3 lb.

Subtract the parallel component of F from F we can get the perpendicular component of F.

F = F − F║ = [30, −45, 50] lb − F║ˆuBC

= [30, −45, 50] lb + 85/3 . [4, 2, −4] / √(4)^2 + (2)^2 + (−4)^2 lb

= [ 440/9, −320/9, 280/9] lb

|F| = √(440/9)^2 + (−320/9)^2 + (280/9)^2 lb ≈ 68.0 lb.

Thus, the magnitude of the component perpendicular to segment BC is  68.0 lb.

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There will be 3 trichloro derivatives of cyclobutane , out of which two are Chiral and cyclopentane will consist of 7 trichloro derivatives out of which all are Chiral.

Those organic compounds which rotate the plane polarized light and having one C atom with 4 different atoms attached and having a symmetry element like plane of symmetry, line of symmetry and centre of symmetry are known as Chiral compounds while those who don't possess any symmetry element are called Achiral compounds . It doesnt rotate plane polarized light.

Trichloro derivative of cyclobutane and cyclopentane are shown in picture below in which molecules containing C atom having * symbol are chiral and rest are achiral.

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Cyclobutane will have three trichloro derivatives, two of which are chiral, and cyclopentane will have seven trichloro derivatives, all of which are achiral.

Organic compounds that have one C atom with four different atoms attached, rotate plane polarized light, and have a symmetry element like a plane of symmetry, line of symmetry, or center of symmetry are known as chiral compounds, whereas compounds without any symmetry element are known as achiral compounds. Light with a plane polarization is not rotated.

The image below shows the trichloro derivative of cyclobutane and cyclopentane, in which the molecules containing the C atom with the symbol * are chiral while the remaining molecules are achiral.

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Explanation:

Opening the container will be difficult due to the low pressure. But, if you manage to get it open, then air from outside will immediately rush in. The pressure will rise up to atmospheric pressure, and the boiling point of water will go back up to 100°C.

Answer:D:32

Explanation:

because the temperature is low so the chemical reactions affect the reaction rate

The molarity of 0.800 moles of sugar in 250 ml of solution is 3.2 M

To solve this molarity problem, the formulas and the procedures that we have to use are:

M = n(solute)/v(solution) L

Where:

Information about the problem:

Converting the volume units from (ml) to (L) we have:

v(solution) =  250 ml * (1 L/1000 ml)

v(solution) = 0.250 L

Applying the molarity formula, we get:

M = n(solute)/v(solution) L

M = 0.800 mol  / 0.250 L

M = 3.2 M

In chemistry a solution is known as a homogeneous mixture of two or more components called:

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A weak acid ha, has a p k a of 5.0. if 1.0 mol of this acid and 0.1 mol of naoh were dissolved in one liter of water, 4.05 is final ph .

The term pH, which originally stood for "potential of hydrogen" (or "power of hydrogen"), is used in chemistry to describe how acidic or basic an aqueous solution is. Greater pH values are seen in basic or alkaline solutions than acidic solutions.

Since hydrogen ions are logarithmic, the pH scale shows how many of them are present in a solution in inverse proportion.

M = mol dm3, where. Acidic solutions have a pH under 7, while basic solutions have a pH over 7, at a temperature of 25 °C (77 °F). At this temperature, solutions with a pH of 7 are neutral (i.e., have the same amount of H+ and OH- ions, like pure water), meaning they don't react with one another. Temperature has an impact on the pH's neutral value.

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\begin{gathered}6x - 2y = 6 \\ 6x = 6 + 2y \\ x = \frac{6 + 2y}{6} \end{gathered}

6x−2y=6

6x=6+2y

x=

6

6+2y

The acid must always be added to water with constant stirring because the process is highly exothermic and it can be dangerous. Therefore, the assertion is correct but the reason is incorrect.

1.Acid is thoroughly diluted with water before being added.

2.It should be introduced very gradually while being stirred continuously.

3.Acid addition to water is a highly exothermic reaction, releasing a lot of heat in the process.

4.The heat produced by the stirring is absorbed by the water, making the situation safer.

5.The amount of ions in a given volume are more concentrated when an acid and water are combined. However, it has nothing to do with continuously swirling acid into water.

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2.0 moles of carbon, 5.0 moles of hydrogen, 1.0 mole of nitrogen and 2.0 moles of oxygen would be needed to make 1.0 mole of glycine.

n(glycine) = 1.0 mole; amount of glycine

In one mole of glycine there are 2 moles of carbon atoms.

n(glycine) : n(C) = 1 : 2

n(C) = 2 × n(glycine)

n(C) = 2 × 1.0 mol

n(C) = 2.0 mol; amount of carbon

n(glycine) : n(H) = 1 : 5

n(H) = 5 × n(glycine)

n(H) = 5 mol; amount of hydrogen

n(glycine) : n(N) = 1 : 1

n(N) = 1.0 mol; amount of nitrogen

n(glycine) : n(O) = 1 : 2

n(O) = 2.0 mol; amount of oxygen

7.8×10⁻² moles of water were in the sample of the salt

m(NiCl₂·6H₂O) = 3.5 g; mass of a hydrous salt

m(NiCl₂) = 2.1 g; mass of an anhydrous salt

m(H₂O) = m(NiCl₂·6H₂O) - m(NiCl₂)

m(H₂O) = 3.5 g - 2.1 g

m(H₂O) = 1.4 g; mass of water

M(H₂O) = 18 g/mol; the molar mass of water

n(H₂O) = m(H₂O) ÷ M(H₂O)

n(H₂O) = 1.4 g ÷ 18 g/mol

n(H₂O) = 0.078 mol; amount of water in the sample

The mole is an SI unit which measures the number of particles in substance. One mole is equal to 6.022·10²³ atoms.

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1.95 milliliters are used to prepare the idodine-131 solution.

an activity of iodine-131 = 2.0 mCi/ml

If the solution has an activity of 2.0 mCi/mL, one milliliter has the radioactivity of 2.0 mCi.

V = 3.9 mCi / (2.0 mCi/ml)

V = 1.95 ml; volume used to prepare the iodine-131 solution

The radioactivity (the unit curie (Ci)) is the number of radioactive decays per second.

In this example, the unit for the radioactivity is millicurie (mCi).

The curie (Ci) is named after scientist Marie Curie.

Iodine-131 is a radioactive isotope treat the thyroid gland. Radioactive iodine emits gamma waves and beta particles.

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The formula Sr₂O₂ is incorrect for strontium oxide, because it is not the simplest formula for this compound.

The correct formula for strontium oxide is SrO.

There are equal numbers of positive and negative ions.

Ratio of the cations and anions is 1 : 1.

Strontium is Earth alkaline metals, group 2 in Periodic system of the elements.

Strontium electron configuration: ₃₈Sr 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s²; two valence electrons is 5s² orbital.

Oxygen will form anion O²⁻.

Electron configuration of oxygen atom: ₈O 1s² 2s² 2p⁴.

Oxygen gain two valence electron to form anion with stable electron configuration as noble gas neon (atomic number 10).

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If the elements achieve the following ions then they are likely to attain the noble-gas configurations. The example of elements attaining ionic forms are given below:

[Ne], N3−

[Ar], Ca2+

[Ar], S2−

[Kr], Br−

Noble gas configuration refers to the symbol of the last Nobel gas and the configuration of the remaining electrons of the atom preceding that Nobel gas.

According to the Nobel gas configuration, if an atom has 8 electrons in the valence shell then it becomes the most stable atom.

All noble gases have eight electrons in their outermost shells making them the most stable and inert elements of the periodic table.

For example, the Neon symbol refers to the standard Nobel gas configuration thus making the noble gas configuration for sodium [Ne]3s1.

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