What is A Chemical Bond- ASAP!

Answer:

9.936x10^22 atoms of CH4

Explanation:

grams ----> mol

2.65 g CH4 if 1 mol of CH4 = 16.04 g CH4

2.65/16.04 = 0.165 mol of CH4

mol ------> atoms

1 mol = 6.022 x 10^23 atoms

0.165 mol x 6.022x10^23 = 9.936x10^22 atoms of CH4

Answer:

3-chloro-3-methylpentane,>2-chloro-3-methylpentane>  1-chloro-3-methylpentane, > chloromethane

Explanation:

The rate of SN1 reactions decreases in the order, tertiary > secondary > primary > methyl.

This implies that, a tertiary alkyl halide is better able to undergo nucleophilic substitution by SN1 mechanism compared to a secondary, primary or methyl.

This is because, the transition state leading to the formation of an SN1 product involves a carbocation. The order of stability of carbocations is; tertiary > secondary > primary > methyl.

Hence a tertiary alkyl halide such as 3-chloro-3-methylpentane leads to a more stable transition state and undergoes SN1 reaction at a faster rate.

Answer:

Explanation:

Balanced Molecular reaction

[tex]Ni(s) + 2HCl(aq)[/tex] →[tex]NiCl2(aq) +H2(g)[/tex]

Complete ionic reaction

[tex]2 H^+ (aq) + 2 Cl^- (aq) + Ni (s)[/tex]→[tex]Ni^2+ (aq) + 2 Cl^- (aq) + H2 (g)[/tex]

Net ionic reaction

[tex]Ni(s)+ 2H^+(aq)[/tex]→[tex]Ni^2+(aq) + H2(g)[/tex]

Answer:

The main ways that scientists communicate research results is by publishing the results in journals. ... Some journals are peer-reviewed, meaning they only publish articles that pass a certain standard of quality -- peer-reviewed journals are usually for a specific audience, such as other scientists.

Explanation:

Answer:

Explanation:

C = 74.01 %

H= 5.23 %

O=20.76 %

Ratio of moles of C , H , O

= 74.01 / 12 : 5.23 / 1 : 20.76 / 16

= 6.1675 ;5.23 : 1.2975

= 4.75 : 4.03 : 1

= 4.75 / .25 : 4.03 / .25 : 1/.25

= 19 : 16 : 4

Empirical formula

= C₁₉ H₁₆O₄ .

Answer:

Explanation:

pH = 4.08

[ H⁺ ] = 10⁻⁴°⁰⁸

= 8.3 x 10⁻⁵

concentration of acid = .3250 M

           HA      ⇆      H⁺     +     A⁻

      .325                 8.3 x 10⁻⁵     8.3 x 10⁻⁵

Ka = (8.3 x 10⁻⁵ )² / .325

= 68.9 x 10⁻¹⁰ / .325

= 212 x 10⁻¹⁰ M .

pKa = - log ( 212 x 10⁻¹⁰ )

= 10 - log 212

= 10 - 2.32

= 7.68 .

Answer:

Pour fluorescent dye and phenyl oxalate ester solution into the glass beaker with the hydrogen peroxide. Once the two solutions are combined, a chemical reaction will take place and cause the fluid to glow in the dark.

Answer:

Explanation:

Zn    +     2HCl   =   ZnCl₂  +     H₂

1 mole   2 mole  

1.34 g = 1.34 / 65. = .0206 mole

60 mL of .75 M HCl = .045 mole of HCl

so full .0206 mole of Zn will react with .0412 mole of HCl

.0206 mole of Zn gives out 3.14 kJ of heat

1 mole of Zn will react to give  152.43 kJ of heat

enthalpy change of heat per mole of Zn

= 152.43 kJ .

Answer: B

Explanation:

Answer:

A

Explanation:

Answer:Electrical conductivity of earth materials is influenced by the metal content (sulfides) in the rock, porosity, clay content, permeability, and degree of pore saturation. hope this helps

Explanation:

Answer:

As the amount of NaBH4 is increased, the overall reaction rate also increases

Explanation:

This question tells us that NaBH4 is typically used in excess.

the rate law for reduction of an aldehyde is first order in NaBH4 and also in aldehyde,

We have The rate of reaction to be the equation below;

Rate = k[aldehyde][NaBH4]

The Rate of the reaction is directly proportional to NaBH4 concentration.

Therefore since they are directly proportional, when the amount of NaBH4 is increased, we will also have the overall reaction rate increase.

Answer:

1000 mL.

Explanation:

From the question given above, the following data were obtained:

Volume of stock solution (V1) = 40 mL

Molarity of stock solution (M1) = 1.25 M

Molarity of diluted solution (M2) = 0.05 M

Volume of diluted solution (V2) =...?

The volume of diluted solution can be obtained as shown below:

M1V1 = M1V1

1.25 × 40 = 0.05 × V2

50 = 0.05 × V2

Divide both side by 0.05

V2 = 50/0.05

V2 = 1000 mL

Therefore, the stock solution must be diluted to 1000 mL to obtain a 0.05 M solution of NaCl.

Answer: 7.24 g of aluminium nitrate is required to prepare 2.000 L of a 0.0170 M aqueous solution of this salt.

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

Given :

Molarity of solution = 0.0170 M

Volume of solution = 2.000 L

[tex]Molarity=\frac{n}{V_s}[/tex]

where,

n= moles of solute

[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{xg}{213g/mol}[/tex]

[tex]V_s[/tex] = volume of solution in Liter = 2.000 L

[tex]0.0170M=\frac{x}{213g/mol\times 2.000L}[/tex]

[tex]x=7.24g[/tex]

7.24 g of aluminium nitrate is required to prepare 2.000 L of a 0.0170 M aqueous solution of this salt.

Answer:

the total mass of insulin in the bottle would be 3.75 g

hope this helps :)

Explanation:

c= 50 mg/mL  

m = ?

v = 125 mL

c=m/v

[tex]\frac{50mg}{mL}[/tex]=[tex]\frac{m}{125mL}[/tex]

m=30×125

m=3750 mg or 3.75 g

Insulin has been the peptide hormone that is produced by the pancreatic cell of the body. The insulin solution of a concentration of 50 mg/ml has a mass of 6.25 grams.

Insulin has been the protein that is crucial for cell activity and function. It is a hormone that regulates the blood glucose level in a diabetic patient. The beta cell of the islets of the Langerhans of the pancreas makes insulin.

The glucose formed from the breaking of carbohydrates is controlled in the blood by insulin production so that the metabolic process can take place in an orderly manner.

Given,

Concentration of insulin hormone = 50 mg/mL

The volume of insulin in bottle = 125 mL

The mass of insulin can be calculated from the molar concentration and volume as:

Concentration = mass ÷ volume

Substituting the values above as:

50 mg/mL = mass ÷ 125 mL

Mass = 50 mg /mL × 125 mL

Mass = 6250 mg

The unit of mass is converted from milligram into gram as:

1 gm = 1000 mg

x gm = 6250 mg

x = 6.250 gm

Therefore, 50 gm/mL of concentration has 6.25 gm of insulin in it.

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Answer:

D

Explanation:

They make your sight better in your daily life and all of them are used in labs and other place's

Answer:

Other planets rotate counterclockwise, but Venus rotates clockwise. Scientists believe this is due to an impact with a celestial body that occurred billions of years ago.

Explanation:

The rotation of Venus is unusual in a few ways like retrograde rotation,slow rotation.

1. Retrograde Rotation: Venus rotates in the opposite direction compared to most other planets in our solar system. While Earth and other planets rotate counterclockwise when viewed from the North Pole, Venus rotates clockwise. This retrograde rotation makes Venus unique among the planets in our solar system.

2. Slow Rotation: Venus rotates very slowly, taking around 243 Earth days to complete one rotation on its axis. This is longer than the time it takes for Venus to complete one orbit around the Sun, which is about 225 Earth days. As a result, a day on Venus (one complete rotation) is longer than its year (one orbit around the Sun).

Thus,these unique characteristics of Venus' rotation contribute to its distinct atmospheric conditions and extreme temperature variations between the day and night sides of the planet.

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Answer:

D.measure the mass of an object

Answer: a attract metal objects

Explanation:

are you slow this is the easiest thing ever

Answer:

Volume of oxygen obtained = 30 L

Explanation:

Given data:

Mass of KClO₃ = 100 g

Pressure  = 750 torr = 750/760 = 0.98 atm

Temperature  = 18°C = 18+273 = 291 K

Volume of oxygen obtained = ?

Solution:

Chemical equation:

2KClO₃    →     3O₂ + 2KCl

Number of moles of KClO₃:

Number of moles = mass/molar mass

Number of moles = 100 g/ 122.55 g/mol

Number of moles = 0.82 mol

Now we will compare the moles of KClO₃ with oxygen.

              KClO₃            :               O₂

                  2                :                 3

                0.82            :              3/2×0.82 = 1.23 mol

Volume of oxygen:

PV = nRT

0.98 atm × V = 1.23 mol ×0.0821 atm.L/mol.K × 291 K

0.98 atm × V = 29.4 atm.L

V = 29.4 atm.L /0.98 atm

V = 30 L

Answer:

Ca

Explanation:

Atomic radii vary in a predictable way across the periodic table.  As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period.  Thus, helium is the smallest element, and francium is the largest.

Answer:

1.29×10²⁴ molecules.

Explanation:

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ molecules. Thus, 1 mole of Hydrogen sulfide (H2S) contains 6.02×10²³ molecules.

Next, we shall determine the mass of 1 mole of H2S. This is illustrated below:

1 mole of H2S = (2×1) + 32 = 34 g

Finally, we shall determine the number of molecules in 73 g of H2S as follow:

34 g of H2S contains 6.02×10²³ molecules.

Therefore, 73 g of H2S will contain =

(73 × 6.02×10²³) /34 = 1.29×10²⁴ molecules.

Thus, 73 g of H2S will contain 1.29×10²⁴ molecules.

Answer:

H for the combustion reaction:

C6H12O6(s) + 6O2(g) => 6CO2(g) +6H2O(g)

The answer is -2.81 x 103kJ

Explanation:

The equation for the combustion of glucose is[tex]C_6H_1_2 O_6 + 6 O_2 ----- > 6 CO_2 + 6 H_2 O[/tex]

The products formed in this reaction are Carbon dioxide and Water.

Combustion is a type of chemical reaction that takes place between substances that involves oxygen and produces heat and light in the form of a flame at which the rate of reactant combination is very high as the chemical reaction is in nature due to which more energy is released as a result of which the temperature of the reactant increases and accelerates the reaction even more.

It is a type of exothermic redox chemical reaction occur between a fuel that is a reductant and an oxidant.  Burning is an another word for combustion.

Examples of combustion include a burning matchstick – when the matchstick is struck against a matchbox, the friction heats the head of the matchbox to a temperature at which the chemical reacts and produces more heat, which then goes out into the air and gets burnt in the flame.

For above statement, The products formed in heat of combustion of glucose are Carbon dioxide and Water

Thus, the equation for the combustion of glucose is[tex]C_6H_1_2 O_6 + 6 O_2 ----- > 6 CO_2 + 6 H_2 O[/tex]

The products formed in this reaction are Carbon dioxide and Water.

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Answer:

2.1 g

Explanation:

The question is incomplete and the complete question is shown in the image attached to this answer.

Now look at that image closely; you will notice that:

i) Reactant A is the limiting reactant because it was used up in the reaction.

ii) Reactant B is the reactant in excess because some mass of it was left behind after the reaction.

The mass of the product C formed is the same as the mass of the limiting reactant used up. Hence the theoretical yield of C is 2.5 g

% yield = actual yield/theoretical yield * 100

since = 83%

Actual yield = %yield * theoretical yield/ 100

Actual yield =  83 * 2.5/100

Actual yield = 2.075 g

Answer:

Silver

Explanation:

Silver (Ag) will not react with sulfuric acid (H2SO4(aq)) by single displacement reaction. This is because in the electrochemical series (activity series), silver is below hydrogen and it's less reactive.

The other elements stated (Zinc, Magnesium, Iron) are higher than hydrogen in the activity series and will definitely displace hydrogen in single displacement reaction.

A single-displacement reaction is known as a chemical reaction which occurs which one element is actually replaced or displaced by another in a compound. We represent it as:

B + D-C ➡️ B-C + D

This will readily take place if B is more reactive than D, and it will finally give a more stable product.