Cuando realizamos la "Estructura de
Puntos de Lewis" ¿Qué es lo que se
utiliza para su representación? *

Answer:

Although Thomas Jefferson came to power determined to limit the reach of the federal government, foreign affairs dominated his presidency and pushed him toward Federalist policies that greatly contrasted with his political philosophy. The first foreign episode involved Jefferson's war with the Barbary pirates. For the previous century or so, Western nations had paid bribes to the Barbary states, which would later become Morocco, Algeria, Tunis, and Tripolitania, to keep them from harassing American and merchant ships

Explanation:

Answer:

(Z)-4-methyl-2-pentene

Explanation:

Hydrogenation  is a syn addition. This implies that the hydrogen atoms add to the same face of the multiple bond.

Hence, if we have the alkyne,  4-methyl-2-pentyne which reacts with excess hydrogen in the presence of a platinum catalyst, we obtain  (Z)-4-methyl-2-pentene since the hydrogen atoms add on the same side of the multiple bond.

Answer:

A. It occurs when a gas passes through a tiny hole.

Explanation:

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Answer:

71.7 g of C₆H₅Br are produced at the theoretical yield.

Explanation:

The reaction is:

C₆H₆ + B₂ → C₆H₅Br + HBr

This is an easy excersie, stoichiometry is 1:1

We determine moles of reactants:

42.1 g / 78g/mol = 0.540 moles of benzene

73 g / 159.80 g/mol = 0.457 moles of hydrogen bromide

Certainly, the HBr is the limiting reactant, because I need 0.540 moles of HBr for 0.540 moles of benzene and I only have, 0.457 moles.

0.457 moles of HBr will produce 0.457 of bromobenzene, at the 100 % yield reaction (theoretical yield)

We convert the moles to mass: 0.457 g . 157 g/mol = 71.7 g  

The theoretical yield of the reaction has been 0.457 mol.

The balanced chemical equation for the reaction can be given by:

[tex]\rm C_6H_6\;+\;Br_2\;\rightarrow\;C_6H_5Br\;+\;HBr[/tex]

Accordingly, 1 mole of benzene will give 1 mole of Bromobenzene and 1 mole of Hydrobromide.

The moles can be calculated as;

Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]

Moles in 42.1 grams Benzene:

Moles of Benzene = [tex]\rm \dfrac{42.1}{78}[/tex]

Moles of Benzene = 0.540 mol

Moles of Bromine = [tex]\rm \dfrac{73}{159.80}[/tex]

Moles of Bromine = 0.457 mol.

The limiting reactant in the reaction has been the one that has been present in the lesser quantity as the other reactant to continue to the product formation.

The 1 mole of Benzene requires 1 mole of bromine. So, 0.54 mol of benzene requires. 0.54 mol of bromine. Since the available bromine has been 0.457 mol, Bromine has been the limiting reactant.

The theoretical yield of the reaction will be based on the concentration of Bromine.

Thus, 1 mol of Bromine forms 1 mol of Bromobenzene.

0.457 mol of Bromine will form 0.457 mol of bromobenzene.

The theoretical yield of the reaction has been 0.457 mol.

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Answer:

Ca2 solid state

H2O liquid state

Ca(OH)2 I believe this would be in solid state

H2 gas state

Explanation:

Answer:

crest

Explanation:

Answer:

0.02kg

Explanation:

Given parameters:

Amount of heat  = 5200J

Unknown:

Mass of ice that would be melted at 0°C = ?

Solution:

To solve this problem, use the expression below;

        H  = mL

H is the heat

m is the mass

L is the latent heat of fusion of ice  =  3.33 x 10⁵ J/kg.

 Insert the parameters and solve for m;

           5200  = m x 3.3 x 10⁵

             m  = [tex]\frac{5200}{3.33 x 10^{5} }[/tex]   = 0.02kg

Answer:

c. closer together and lower in energy than those in a gas.

Explanation:

In the different states of matter, the arrangement of particles and the kinectic energy that exists in the state of matter varies depending on which state the matter is in.

The particles of Solid are denser and closer than that of liquid. In solid state, the force of attraction between the particles are greater than the kinectic energy of the particles in a solid matter. Therefore, the particles in solid matter are closer together than those in liquid and gas. And also, the energy is lower in Solid matter than those in liquid and gas.

Liquid on the other hand, has denser particles that are closer together than those in gas. Also, liquid particles has lower energy than those in gas.

Particles in gas are more freer and farther apart from each other than the particle sin solid and gas. Also, particles in gas is greater than those in liquid and solid.

Therefore, the likely arrangement of particles in a liquid is that they are:

c. closer together and lower in energy than those in a gas.

11.12 grams of sodium chloride is required to prepare 380 mL of 0.500 M NaCl (MW = 58.5 g/mol).

HOW TO CALCULATE MASS:

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Answer: A

Explanation: not sure what to say but it’s for sure A it makes sense :) good luck !

The statement best explains why an object appears green in sunlight is (D) More green light is reflected while more red and blue light is absorbed.Hence the correct option is (D).

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.

Common examples include the reflection of light, sound and water waves.

Colored objects look the way they do because of reflected light. When sunlight is shined on a green leaf, the violet, red and orange wavelengths are absorbed. The reflected wavelengths appear green.

Therefore, The statement best explains why an object appears green in sunlight is (D) More green light is reflected while more red and blue light is absorbed.Hence the correct option is (D).

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Answer:

I think it would be b

Explanation:

Answer:

C aq

Explanation:

Means desolves in water

When NaCl is dissolved in water, it separates into its constituent ions Na+ and Cl- ions. The phase of the ions are written as (aq) and that of NaCl is written as (s) .

Sodium chloride is an ionic compound formed by the transfer of electrons from the metal sodium to the nonmetal chlorine. It is used as the common table salt.

Na contains  one valence electron and Cl contains 7 valence electrons. Hence, Na can donate that electron to Cl to achieve octet in both. When Na loss an electron it forms Na+ and Cl gains the electron to form Cl-. These two ions are then attracts to form the NaCl.

When NaCl is dissolved in water the bond between these two ions weaken and the ions gets released  into the solution. The ions in the solution is indicated with the phase aqueous (aq) and the undissolved NaCl is in solid (s) state.

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Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. The correct option are option A,C.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.

Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.

Therefore the correct option are option A,C.

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Answer:

longer/less

Explanation:

In moving from left to right on the periodic table, electromagnetic waves have longer wavelength and less energy.

The electromagnetic radiation diagram is made up of electromagnetic waves.

Answer:

D

Explanation:

because the higher the wavelength the shorter the pitch and the shorter the wavelength the higher the pitch

Answer: In fact, all of the major landforms that we find on the continents ... Mid-ocean ridges, also called seafloor-spreading centers, are long, ... 1 km = 100,000 cm or 1 x 105 cm ... a mid-ocean ridge with a SLOW spreading rate (1 to 5 cm/yr, full rate).

Explanation:

As the Earth's tectonic plates separate, new ocean bottom is generated along divergent plate borders, which are known as mid-ocean ridges. Massive basalt volcanic eruptions result from molten rock rising to the seafloor as the plates divide.

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Answer:

Diphosphorus tetraiodide

Explanation:

Diphosphorus tetraiodide is an orange crystalline solid with the formula P2I4. It has been used as a reducing agent in organic chemistry. It is a rare example of a compound with phosphorus in the +2 oxidation state, and can be classified as a subhalide of phosphorus.

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The name of the molecular compound with the formula [tex]\rm P_2I_4[/tex] is diphosphorus tetraiodide.

The term "compound" refers to two or more elements joined together such that the elements have lost their individual identity in favor of a new set of properties.

The given molecular compound  [tex]\rm P_2I_4[/tex] is diphosphorus tetraiodide.

Therefore, diphosphorus tetraiodide is the name of the molecular compound with the formula  [tex]\rm P_2I_4[/tex] .

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The body fat of humans can be measured by the density in grams per mL. The volume of the fat with a density of 0.94 g/mL and mass of 5.2 lb is 2.50 L.

The volume is the factor of the dimension that inversely affects the density of the substance. The volume is given by the division of the mass by the density. It can be given in mL or cubic centimeters.

Given,

Mass of body fat = 5.2 lb

Density of human fat = 0.94 g/mL

At first, mass is converted from lb to grams as:

1 lb = 453.592 grams

So, 5.2 lb = 2358.68 grams

Secondly, volume is calculated as:

Volume = Mass ÷ density

V = 2358.68 grams ÷ 0.94 g/mL

= 2509.23 mL

Thirdly, volume from ml is converted to L as:

1 mL = 0.001 L

2509.23 mL = 2.50 L

Therefore, 2.50 liters of body fat has to be removed from the body.

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Answer:

5.3 mol CO₂

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

3.2 × 10²⁴ molecules CO₂

Step 2: Convert

[tex]3.2 \cdot 10^{24} \ mc \ CO_2(\frac{1 \ mol \ CO_2}{6.022 \cdot 10^{23} \ mc \ CO_2} )[/tex] = 5.31385 mol CO₂

Step 3: Check

We are given 2 sig figs. Follow sig fig rules.

5.31385 mol CO₂ ≈ 5.3 mol CO₂

Answer:

Explanation:

white ring of NH₄X is formed . Here X is Cl and

NH₄X is NH₄Cl ( ammonium chloride )

The reaction is as follows

NH₃ + HCl = NH₄Cl ( white fume )

The acid that reacts with ammonia has been Hydrochloric acid (HCl), and the element X in the acid has been Chlorine (Cl).

The ammonia has been the gas with the pungent smell. It has been the compound with the dihybrid element used for the production of various nitrogen compounds.

The reaction of Ammonia with acid results in the formation of ammonium ions. The ions on reacting with the basic part of the acid, form the salt and give the product.

The white ring with the reaction of ammonia has been formed of the ammonium chloride. Thus the acid that reacts with ammonia has been Hydrochloric acid (HCl), and the element X in the acid has been Chlorine (Cl).

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Answer:

A

Explanation:

Answer: a

Explanation: one that changes the color of a rabbit, allowing it to hide from predators.

Grams of acetic acid in 500 ml vinegar=39.744 g

Titration (equivalence point⇒mol acid(CH₃COOH)=mol base(NaOH))

M₁V₁n₁=M₂V₂n₂(n=valence acid/base, for CH₃COOH and NaOH=1)

[tex]\tt M_1\times 2.5\times 1=0.0960\times 34.5\times 1\\\\M_1(acetic~acid)=1.3248~mol/L[/tex]

For MW CH₃COOH = 60 g/mol, mass of acetic acid in 1 L :

[tex]\tt 1.3428~mol/L\times 60~g/mol=79.488~g/L[/tex]

for 500 ml :

[tex]\tt 79.488\times 0.5~L=39.744~g[/tex]

The mass of vinegar present in 500mL of solution is 39.6 g.

Concentration of acid (CA) = ?

Volume of acid(VA) = 2.50 ml

Concentration of base (CB) =0.0960 M

Volume of base (VB) =  34.50 ml

Number of moles of acid = 1

Number of moles of base = 1

Equation of the reaction;

CH3COOH (aq) + NaOH(aq) ------> CH3COONa(aq) + H2O(l)

From CAVA/CBVB = NA/NB

CAVANB = CBVBNA

CA = CBVBNA/VANB

CA = 0.0960 × 34.50 × 1/2.50 × 1

CA = 1.32 M

Number of moles = concentration  × volume

Number of moles = 1.32 M × 500/1000

Number of moles = 0.66 moles

Number of moles = mass/molar mass

Mass = Number of moles  × molar mass

Molar mass of acetic acid = 60 g/mol

Mass =  0.66 moles  ×  60 g/mol

Mass = 39.6 g

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Answer:

This question is incomplete but the completed question is in the attachment below. And the correct is b

Explanation:

Specific heat capacity can be defined as the amount of heat required to raise to raise 1 kg of a substance by 1 kelvin. Thus, this means that when the specific heat capacity of a substance is high, it takes more energy to increase the temperature of that substance. This also means that when different substances are subjected to the same amount of heat, the substance with the higher specific heat capacity will absorb less heat; for example at a beach, water has a very high specific heat capacity, thus when the sand in the beach is hot, the beach water is still relatively cold.

From the description above, it can be seen that the metal with the least specific capacity will absorb the greatest amount of heat, thus the metal is lead with the specific heat capacity of 0.129 J/(g. °C).

Answer:

The final temperature is 181.92°C

Explanation:

Given

Initial Temperature, T1 = 0°C

Initial Volume, V1 = 555mL

Initial Pressure, P1 = 80.0kPa

Final Volume, V2 = 1880ml

Final Pressure, P2 = 39kPa

Required

Determine the Final Temperature, T1

This question illustrates ideal gas law and will be solved using:

(P1 * V1)/T1 = (P2 * V2)/T2

But first, we need to convert temperature to degree Kelvin

T1 = 0°C = 273 + 0 = 273k

Next, we substitute values for P1, V1, T1, P2 and V2

THE EQUATION BEFOMES

(80 * 550)/273 = (1880 * 39)/T2

44000/273 = 73320/T2

Cross Multiply

44000 * T2 = 73320 * 273

44000T2 = 20016360

Solve for T2

T2 = 20016360/44000

T2 = 454.92K

Convert to degree Celsius

T2 = 454.92 - 273

T2 = 181.92°C

Hence, the final temperature is 181.92°C

The ideal gas law, also called the general gas equation, is the equation of the state of a hypothetical ideal gas.

The ideal gas law work under the constant:-

Hence the formula we gonna use is as follows:-

[tex]PV = nRT[/tex]

In the question, the pressure, temperature, and volume are given in two different system

Hence it is equal to

[tex]\frac{PV}{T} = \frac{PV}{T}[/tex]

Put the value given,

[tex]\frac{80*50}{273} = \frac{1880*39}{T}[/tex]

Solving the equation, the value T will be:-

[tex]T2 = \frac{20016360}{44000}[/tex]

=181.92C

The temperature given is 181.92C

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One mole of an atom of a substance is equal to the  gram molecular mass of the element. Therefore, the correct option is option B among all the given options.

A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.

A mole consists of precisely 6.022140761023 particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants. One mole of an atom of a substance is equal to the  gram molecular mass of the element.

Therefore, the correct option is option B among all the given options.

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Answer:

x=51.66

Explanation:

1 ml = 1 gram

(mass) (Δt) (Cp) = (mass) (Δt) (Cp)

Substituting values into the above, we then have:

(25)(25-x)(4.184)=(50)(x-65)(4.18)

Solve for x

x= 51.6667

The final temperature is "51.67°C".

According to the question,

At 65°C,

= [tex]\frac{50}{50+25}[/tex]

= [tex]\frac{50}{75}[/tex]

= [tex]0.66667[/tex]

At 25°C,

= [tex]\frac{25}{50+25}[/tex]

= [tex]\frac{25}{75}[/tex]

= [tex]0.33333[/tex]

By multiplying the volume fractions, we get

→ [tex]65^{\circ} C\times 0.66667[/tex] = [tex]43.3334^{\circ}C[/tex]

→ [tex]25^{\circ} C\times 0.33333[/tex] = [tex]8.3333325^{\circ} C[/tex]

hence,

The final temperature will be:

= [tex]43.33334+8.333325[/tex]

= [tex]51.6666^{\circ}C[/tex]

or,

= [tex]51.67^{\circ} C[/tex]

Thus the above answer is right.

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Answer:

visible light waves are the only electromagnetic waves we can see