Plz someone answer my question..​

Answer:

True

It is true that he size of coupling constants (J values) depend on three factors:

a. Through bond distance between the protons.

b. Angle between the two C-H bonds.

c. Electronegative substituents.

Explanation:

With the increase in the valence angle the coupling constant reduces. The distance between the carbon atoms also influence coupling constant. With increase in bond length, the coupling constant decreases. Also the more an atom is electronegative, the lesser is the coupling constant

Thus, it is true that he size of coupling constants (J values) depend on three factors:

a. Through bond distance between the protons.

b. Angle between the two C-H bonds.

c. Electronegative substituents.

Answer:

Antimony

Explanation:

Protons-51

Neutrons-71

Electrons-51

Answer:

el que paso del one jhaulio

Explanation:

Answer:

True

Explanation:

The unit cell is the smallest group of atoms which has the overall symmetry of a crystal, and from which the entire lattice can be built up by repetition in three dimensions (Oxford dictionary).

The number of atoms in a unit cell of a crystal structure must be equal to or a multiple of the number of atoms in the empirical formula of the compound. In other words, the unit cell should contain the formula unit of the compound.

The mass allowance of Vitamin C for children aged 4-8 years is equal to 0.025 grams.

A mole can be defined as a standard unit that can be utilized to evaluate the number of entities such as atoms, molecules, ions, or other particular particles in a particular amount of the substance.

The number of elementary entities present in one mole of any chemical substance was found to be equal to 6.023 × 10²³ which is also known as the Avogadro number.

Given, the number of moles of vitamin C = 0.000142 moles

Given, the molecular formula of Vitamin C is C₆H₈O₆.

The mass of one mole of C₆H₈O₆ = 176 g

One mole of Vitamin C has mass = 176 g

0.000142 mol of Vitamin C has mass  = 0.000142×176 = 0.025 g

Therefore, the mass of 0.000142 mol of Vitamin C is 0.025 g.

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Answer:

142.5 g

Explanation:

According to the chemical reaction:

C₆H₁₂O₆ --> 2 C₂H₅OH + 2 CO₂

1 mol of glucose (C₆H₁₂O₆) forms 2 moles of ethyl alcohol (C₂H₅OH) and 2 moles of carbon dioxide (CO₂).

We first convert the moles to grams by using the molecular weight (Mw) of each compound:

Mw (C₆H₁₂O₆) = (12 g/mol x 6) + (1 g/mol x 12) + (16 g/mol x 6)= 180 g/mol

1 mol C₆H₁₂O₆ = 180 g/mol x 1 mol = 180 g

Mw(C₂H₅OH) = (12 g/mol x 2) + (1 g/mol x 5) + 16 g/mol + 1 g/mol= 46 g/mol

2 mol C₂H₅OH = 2 mol x 46 g/mol = 92 g

Thus, when the process is 100% efficient, 180 grams of glucose produce 92 grams of ethyl alcohol. To form 51.0 grams of ethyl alcohol, we will need:

51.0 g C₂H₅OH x (180 g C₆H₁₂O₆/92 g C₂H₅OH) = 99.8 g C₆H₁₂O₆

As the process has a lower efficiency (70.0%), we will need more glucose to obtain the required yield. So, we divide the mass of glucose required for a process 100% efficient by the actual efficiency:

mass of glucose required = 99.8 g C₆H₁₂O₆/(70%) = 99.8 g C₆H₁₂O₆ x 100/70 = 142.5 g

Therefore, it would be required 142.5 grams of glucose to obtain 51.0 grams of ethyl alcohol.

Answer: The activation energy, Ea, of the reaction is 89195 Joules

Explanation:

The effect of temperature on rate constant is given by Arrhenius equation:

[tex]ln \frac{k_{2}}{k_{1}} = \frac{-E_{a}}{R}[\frac{1}{T_{2}} - \frac{1}{T_{1}}][/tex]

where  

[tex]k_2[/tex] = rate constant at temperature [tex]T_2[/tex]

[tex]k_1[/tex] = rate constant at temperature [tex]T_1[/tex]

[tex]E_a[/tex]= activation energy

R= gas constant

[tex]T[/tex] = temperature  

[tex]ln \frac{17k_1}{k_{1}} = \frac{-E_{a}}{8.314}[\frac{1}{300} - \frac{1}{278}][/tex]

[tex]2.83=\frac{-E_{a}}{8.314}[\frac{1}{300} - \frac{1}{278}][/tex]  

[tex]E_a=89195J[/tex]

The activation energy, Ea, of the reaction is 89195 Joules

Answer:

yes answer os Na because it's electronic configuration is 1s^2,2s^2,2p^6,3s^1

Answer:NaOH

Explanation:all are acids except NaOH

Answer:

it is NaOH

Explanation:

Because NaOH is base, while the others are acid

Answer:

28.9452

Explanation:

Answer:

28.9452%

Explanation:

Rb-44.1781

Cr-26.8767

O-28.9452

Answer:

0.26g of NaCl is the maximum mass that could be produced

Explanation:

Based on the reaction:

HCl + NaOH → NaCl + H₂O

Where 1 mol of HCl reacts per mol of NaOH to produce 1 mol of NaCl

To solve this question we need to find limiting reactant. The moles of limiting reactant = Moles of NaCl produced:

Moles HCl -Molar mass: 36.46g/mol-:

0.365g HCl * (1mol / 36.46g) = 0.010 moles HCl

Moles NaOH -Molar mass: 40g/mol-:

0.18g NaOH * (1mol / 40g) = 0.0045 moles NaOH

As the reaction is 1:1 and moles NaOH < moles HCl, limiting reactant is NaOH and maximum moles produced of NaCl are 0.0045 moles.

The mass of NaCl is:

Mass NaCl -Molar mass: 58.44g/mol-:

0.0045 moles * (58.44g/mol) =

Answer:

B

Explanation:

4moles of Cl2 produces 4moles of HCl therefore 12moles of Cl2 will produce 12moles of HCl

Answer:

Vaccines. Vaccines are chemicals that stimulate the body's immune system to better fight pathogens when they attack the body. ...

Antibiotics. ...

Pest Resistant Crops. ...

Plant and Animal Breeding. ...

Biocatalysts. ...

Fermentation. ...

Microorganisms. ...

Bioremediation.

Explanation:

Answer:

See explanation

Explanation:

When water reacts with formic acid, The following equilibrium is set up;

HCOOH(aq) + H20(l) ⇄ HCOO-(aq) + H30+(aq)

This is because, the water abstracts a proton from formic acid to form its conjugate base, formate ion.

At equilibrium,  the forward is favored.

The organelle(s) that act(s) as "the boss" inside a cell is The nucleus.

Nucleus is the center most part of the cell that contains all the chromosomes and that contains all the genetic information.

The nucleus is a double-membraned organelle that contains the genetic material and other instructions required for cellular processes. It is exclusively found in eukaryotic cells and is also one of the largest organelles.

The nucleus contains nearly all of the cell's DNA, surrounded by a network of fibrous intermediate filaments and enveloped in a double membrane called the nuclear envelope. The nuclear envelope separates the fluid inside the nucleus, called the nucleoplasm, from the rest of the cell.

Therefore, The organelle(s) that act(s) as "the boss" inside a cell is The nucleus.

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Answer:

The image appears to have some words cropped out. Nonetheless, "receptor" would seem to be the most appropriate term here.

Answer: c

Explanation:

18

Answer:

17.99 g H2O

Explanation:

13 g C2H2(1 mol C2H2/26.04 g C2H2)(2 mol H2O/1 mol C2H2)(18.02 g H2O/1 mol H2O) = 17.99 g H2O used up

Answer:

240/60 .minute

plz make me brainliest

Answer:

$89.69

Explanation:

$1000 = 1 oz = 28.3g

volume = mass/density

volume = 28.3/19.3 = 1.47cm³

1 inch= 2.54 cm

1 cubic inch = (2.54)³ = 16.39 cm³

16.39/1.47 = 11.15 cubic inch

11.15 cubic inch = $1000

1 cubic inch = 1000/11.15 = $89.69

Answer:

a

Explanation:

If one DNA strand reads CCGTAATGCAT, the sequence of the complementary strand will be - b) GGCATTACGTA

So, DNA strand -                        C-C-G-T-A-A-T-G-C-A-T

Complementary DNA strand -  G-G-C-A-T-T-A-C-G-T-A

Thus, If one DNA strand reads CCGTAATGCAT, the sequence of the complementary strand will be - b) GGCATTACGTA

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Answer:

b.

Explanation:

From the given information:

[tex]p = \dfrac{zM}{N_oa^3}[/tex]

where;

a = 0.41 nm = [tex]4.1 \times 10^{-8} \ cm[/tex]

M = 90.5 + 37.3 = 127.8 g/mol

[tex]N_o = 6.023 \times 10 ^{23}[/tex]

p = 3.15 g/cm³

∴

[tex]3.15 = \dfrac{z \times 127.8}{(6.02 \times 10^{23}) \times (4.1 \times 10^{-8} )^3}[/tex]

Z = 1

Thus, the ceramic material has a simple cubic crystal system and the crystal structure is possible to be Cesium chloride.

Answer:

C₃H₈(g) + 6 H₂O(g) ⇒ + 10 H₂(g) + 3 CO₂(g)

Explanation:

Propane can be turned into hydrogen by the two-step reforming process.

In the first step, propane and water react to form carbon monoxide and hydrogen. The balanced chemical equation is:

C₃H₈(g) + 3 H₂O(g) ⇒ 3 CO(g) + 7 H₂(g)

In the second step, carbon monoxide and water react to form hydrogen and carbon dioxide. The balanced chemical equation is:

CO(g) + H₂O(g) ⇒ H₂(g) + CO₂(g)

In order to get the net chemical equation for the overall process, we have to multiply the second step by 3 and add it to the first step. Then, we cancel what is repeated.

C₃H₈(g) + 3 H₂O(g) + 3 CO(g) + 3 H₂O(g) ⇒ 3 CO(g) + 7 H₂(g) + 3 H₂(g) + 3 CO₂(g)

C₃H₈(g) + 6 H₂O(g) ⇒ + 10 H₂(g) + 3 CO₂(g)

Answer:

Pe = 8700 N/m³

Vesp = 1,15 cm³/g

Explanation:

Ya que conocemos el valor de la densidad de este aceite, es muy sencillo calcular tanto volumen como peso específico.

En el caso de volumen específico, esta se refiere al cociente del volumen de un líquido con su masa respectiva. En otras palabras, es el inverso de la densidad, por tanto usamos la siguiente expresión para el volumen específico:

Vesp = 1/d

Vesp = 1 / 0,87

Para el caso del peso específico, se calcula como el cociente de la masa del líquido y su volumen que ocupa. Sin embargo no conocemos ninguno de esos dos datos, por lo que para calcular el peso específico solo basta multiplicar este valor por la aceleración de gravedad, que vamos a asumir para este problema que es 10 m/s². Y ademas cambiaremos las unidades de densidad de g/cm³ a kg/m³. Esto es porque las unidades de peso específico son N/m³ y los newton (N) son kg m/s².

d = 0,87 g/cm³ * (1 kg/1000g) * (100 cm/1m)³ = 870 kg/m³

Pe = 870 kg/m³ * 10 m/s²

ESpero te sirva.

Answer:

Constrictive,

Explanation:

Constrictive population pyramid displays lower percentages of younger people

Answer:

a. Br2 (l) → Br2(g) ΔH°rxn = 30.91 kJ/mol

Explanation:

Bond enthalpy is the energy which is required to break 1 mol of of bonds in gaseous covalent molecules. Bond breaking process can be endothermic or exothermic depending on the molecules association. The process needs to be performed in chemical laboratory under standard conditions.

Answer:

the heat given off is 75 J.

Explanation:

Given;

latent heat of fusion of lead, L= 25 J/g

mass of liquid lead, m = 3.0g

The heat given off is calculated as;

H = Lm

Where;

H is the quantity of heat given off

H = 25 x 3

H = 75 J.

Therefore, the heat given off is 75 J.

Answer:

=external pressure on liquid