PLEASE HELP!!!!! (SCIENCE!!!)

The values of n in CH₃(CH₂)ₙCH₃ if the name of the hydrocarbon is heptane is equal to 5.

Hydrocarbonds are the compounds which are formed by the composition of hydrogen and carbon atoms.

In the question wanted hydrocarbon is heptane, in which 'hept' means 7 and 'ane' means alkane. Given formula of hydrocarbon is CH₃(CH₂)ₙCH₃ in which already 2 carbons of CH₃ group is present and to complete 7 carbons, the number of n should be 5.

So the required value of n is 5.

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Taking into account the definition of molarity, the molarity of the solution is 8.066 [tex]\frac{moles}{liter}[/tex].

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

[tex]Molarity=\frac{number of moles}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case, you know:

Replacing in the definition of molarity:

[tex]Molarity=\frac{12.099 moles}{1.5 L}[/tex]

Solving:

molarity= 8.066[tex]\frac{moles}{liter}[/tex]

Finally, the molarity of the solution is 8.066 [tex]\frac{moles}{liter}[/tex].

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Answer:

The answer is Crude oil, natural gas, and coal.

Explanation:

Hydrocarbon are highly combustible and produce carbon dioxide, water, and heat when they are burned.

-Hope this helps!

-Justin

The rate and quantity of carbon flow today has increased exponentially compared to 300 years ago.

Carbon flow refers to the process by which carbon flows through the earth.

Carbon flow can also be referred to as the carbon cycle.

Due to industrialization and the burning of fossil fuels, the rate of carbon flow has increased exponentially.

Therefore, compared to 300 years ago, the rate and quantity of carbon flow has increased.

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Answer:

Solids

Explanation:

Electromagnetic waves travel fastest in empty space. But they are slowest in solids

Based on the percentage mass of chlorine in tubocurarine, the mass of chlorine in 500 kg of tubocurarine is 52.13 kg.

Tubocurarine chloride is the chloride salt form of tubocurarine which has the molecular formula below:

[tex]C_{37}H_{42}Cl_2N_2O_6[/tex]

The molecular mass of tubocurarine = 681 g/mol

mass of chlorine in tubocurarine = 71 g

Percentage mass of chlorine = 71/861 × 100% = 10.4%

Mass of chlorine in 500 kg of tubocurarine = 500 Kg × 10.4%

mass of chlorine in tubocurarine = 52.13 kg

Therefore, the mass of chlorine in 500 kg of tubocurarine is 52.13 kg.

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Answer:

C

Explanation:

Isotopes are atoms of the same elements having same atomic number but different mass number

Least no of moles means it should be 1mol

Hence

Volatile organic compounds can be detected by hydrogeologists in the field or labs because of the odor of the vapors emitted from the groundwater and/or soil samples.

Volatile substances are substances which can easily vaporize or change to gaseous state.

Volatile substances can either be solids or liquids but are mostly liquids.

Example of volatile substances include ether, petrol, chocolate.

The presence of volatile substances can be detected by the gases they release which may have characteristic odors.

Therefore, volatile organic compounds can be detected by hydrogeologists in the field or labs because of the odor of the vapors emitted from the groundwater and/or soil samples.

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Answer:

A D F

Explanation:

Its right but its not in order But its A D and F

Answer:

answer in picture

Explanation:

Based on the calculations, the pH of a 0.47 M solution of carbonic acid (H₂CO₃) is equal to 3.35.

First of all, we would write a properly balanced chemical equation for these chemical reactions:

                   H₂CO₃(aq)  ⇄ HCO₃⁻(aq) + H⁺(aq);   Ka₁ = 4.3 × 10⁻⁷.

For the second chemical reaction:

                   HCO₃⁻(aq) ⇄ CO₃²⁻(aq) + H⁺(aq);      Ka₂ = 5.6 × 10⁻¹¹.

Next, we set up an equation from the ICE table;

[HCO₃⁻] = [H⁺] = x.

[H₂CO₃] = 0.47 - x.

Ka₁ = ([HCO₃⁻] × [H⁺])/[H₂CO₃].

4.3 × 10⁻⁷ = (x × x)/(0.47 - x).

4.3 × 10⁻⁷ = x²/(0.47 - x).

x² = 0.0000002021 - 4.3 × 10⁻⁷x

x² + 4.3 × 10⁻⁷x - 0.0000002021 = 0

By solving the quadratic equation, we have:

x = [H⁺] =0.000449 M.

Now, we can determine the pH by using this formula;

pH = -log[H⁺]

pH = -log(0.000449 M).

pH = -(-3.35)

pH = 3.35.

Note: The second dissociation from Ka₂ would be so small, so it's considered negligible.

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The main two requirements to compare the energy for 2 compounds are the balanced chemical formula and the temperature of the compounds.

Gibb's free energy change of any reaction will be calculated by using the below equation as:

ΔG = ΔH - TΔS, where

ΔH = change in enthalpy

T = temperature

ΔS = change in entropy

Before calculating the free energy of any reaction you should first balance the given chemical reaction to check the involved moles of substance and also the value of temperature before & after the completion of reaction to check the nature of the reaction.

Hence balancing the equation and checking the temperature are the two requirements.

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Answer:

Either A. or C. Evaluating, but most likely C.

Explanation:

The reason it is C is because to find out wheather something is true or not, you are not claiming otherwise nor complicating, you are finding, but evaluating sounds better.

Answer:

here.

Explanation:

molar absorptivity, path length of cuvette, test tube, and concentration.

Answer:

This increases our molar volume relative to an ideal gas, which results in a value of Z that is greater than 1.

Explanation:

textbook

Answer:

B. Molar volume decreases

Explanation:

Explanation:

High density medium to low density medium.

solids Highest density definite shape and colour

liquids Indefinite shape and defining volumes particles glide past each other

Gases Indefinite shape Indefinite volume lowest density

Explanation:

this is due to the nature of its molecules

The new volume of the sample of helium gas as its temperature and pressure increases to the given values is 1.40×10²mL.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

At standard remperature and pressure

To calculate the new volume of the helium gas, we subtsitute our given values into the expression above.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

V₂ = P₁V₁T₂ / P₂T₁

V₂ = ( 1.0atm × 0.32L × 425.0K ) / ( 3.50atm × 273.15K )

V₂ = 136LatmK / 956.025atmK

V₂ = 0.14L

V₂ = 1.40×10²mL

Therefore, the new volume of the sample of helium gas as its temperature and pressure increases to the given values is 1.40×10²mL.

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Answer:

the answer to number 9 is A.

Explanation:

Answer:

vVv

Explanation:

innate means "inborn or natural", meaning they were born with it. if somewhat is born with an inate immunity, it means it was passed through genetics aka heredity

Answer:

b) a rubber tire

Explanation:

Answer: B - a rubber tire

Explanation: Rubber is an insulator

Answer:

39.98 liters

Explanation:

hope this helps

12 moles of water are produced when 4.0 moles of propane are mixed with 15.0 moles of oxygen,

A combustion reaction is one in which a substance reacts with oxygen releasing heat and light energy.

People burns in oxygen to produce carbon (iv) oxide and water according to the equation below:

[tex]C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O[/tex]

1 mole of propane reacts with 5 moles of oxygen to produce 4 moles of water.

15 moles of oxygen will react with 3 moles of propane to produce 12 moles of water.

Therefore, If 4.0 moles of propane are mixed with 15.0 moles of oxygen, 12 moles of water are produced

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An antacid is a substance which neutralizes stomach acidity and is used to relieve heartburn, indigestion or an upset stomach. Some antacids have been used in the treatment of constipation and diarrhea. Marketed antacids contain salts of aluminum, calcium, magnesium, or sodium.

Antacids help to treat heartburn (indigestion). They work by neutralizing the stomach acid that causes heartburn. You can buy many antacids without a prescription. Liquid forms work faster, but you may like tablets because they are easy to use.

Answer:

43.2

Explanation:

you use the charles law.

Answer:

Elements are arranged from left to right and top to bottom in order of  increasing atomic number. As, The modern periodic law tells that the Elements in the modern periodic table are arranged by increasing atomic numbers.

Answer:

See below ~

Explanation:

Properties used to arrange elements