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3 years ago

Why is it that no two elements have the exact same emission spectrum?

Chemistry

1 answer:

jonny [76]3 years ago

5 0

Answer:

When atoms are excited they emit light of certain wavelengths which correspond to different colors. Each element produces a unique set of spectral lines. Since no two elements emit the same spectral lines, elements can be identified by their line spectrum.

Explanation:

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please help me with Chem I ONLY HAVE 5 MINUTES if methane gas (CH4) flows at a rate of 0.25L/s, how many grams of methane gas wi

Nookie1986 [14]

Answer:

643g of methane will there be in the room

Explanation:

To solve this question we must, as first, find the volume of methane after 1h = 3600s. With the volume we can find the moles of methane using PV = nRT -<em>Assuming STP-</em>. With the moles and the molar mass of methane (16g/mol) we can find the mass of methane gas after 1 hour as follows:

<em>Volume Methane:</em>

3600s * (0.25L / s) = 900L Methane

<em>Moles methane:</em>

PV = nRT; PV / RT = n

<em>Where P = 1atm at STP, V is volume = 900L; R is gas constant = 0.082atmL/molK; T is absolute temperature = 273.15K at sTP</em>

Replacing:

PV / RT = n

1atm*900L / 0.082atmL/molK*273.15 = n

n = 40.18mol methane

<em>Mass methane:</em>

40.18 moles * (16g/mol) =

<h3>643g of methane will there be in the room</h3>

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3 years ago

True or False Decreasing the temperature and movement of particles will speed up the reaction rate.

marissa [1.9K]

I think it's True hope it helps

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3 years ago

What will most likely happen in the absence of a cell membrane?

Zielflug [23.3K]

<h2>Answer:</h2>

The correct answer is option D which is substances will pass in and out of the cell in an uncontrolled manner.

<h3>Explanation:</h3>

Cell membrane is outer organelle in the cell, it is responsible for the transport of materials into and out to the cell through osmosis and active transport.
In the absence of the cell membrane, there will not be control of transport of a materials to the cell.
Energy production is the task of mitochondria and food storage is the function of vacuoles.
Photosynthesis takes place on the chloroplasts.

3 0

3 years ago

Read 2 more answers

I really need help on this one!!

Lady bird [3.3K]

Answer:

Due to the decrease in the gravitational force, it will take longer time for ball to reach the ground while dribbling. Moreover, the hang time of players will also be longer. This means that the players will stay on air longer and will be able to jump higher.

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3 years ago

2 HI(g) ⇄ H2(g) + I2(g) Kc = 0.0156 at 400ºC 0.550 moles of HI are placed in a 2.00 L container and the system is allowed to rea

Ivahew [28]

Answer:

The concentration of HI at equilibrium is 0.2445 $\frac{moles}{L}$

Explanation:

A chemical reaction occurs in both directions: from reagents transforming into products (direct reaction) and from products transforming back into reactants (reverse reaction)

The mathematical expression that represents the Chemical Balance is the equilibrium constant Kc.

You have:

aA + bB ⇔ cC + dD

where A, B, C and D represent the chemical species involved and a, b, c and d their respective stoichiometric coefficients. So the constant Kc is:

$Kc=\frac{[A]^{a}*[B]^{b} }{[C]^{c}*[D]^{d} }$

That is, this constant Kc is equal to the multiplication of the concentrations of the products raised to their stoichiometric coefficients divided by the multiplication of the concentrations of the reagents also elevated to their stoichiometric coefficients.

So, in this case:

$Kc=\frac{[H_{2}]*[I_{2} ] }{[HI]^{2} }=0.0156$

You have that the initial concentrations are:

[HI]= $\frac{0.550 moles}{2.00 L} = 0.275 \frac{moles}{L}$

[H₂]= 0

[I₂]= 0

Being "x" the change in the concentration that occurs during the reaction, which must be affected by the stoichiometric coefficient, the final concentrations of each species in equilibrium will be:

[HI]= $0.275 \frac{moles}{L}-x$

[H₂]= x

[I₂]= x

Keep in mind that in the case of reagents the concentration "x" is subtracted because the reagents are consumed. In the case of products, the concentration "x" is added because the reagents are formed.

Then:

$0.0156=\frac{x*x}{(0.275-x)^{2} }$

Resolving

0.0156*(0.275-x)²=x²

0.0156*(0.075625-0.55*x+x²)=x²

1.17975*10⁻³-8.58*10⁻³*x+0.0156*x²=x²

-0.9844*x²-8.58*10⁻³*x+1.17975*10⁻³=0

Solving for x will get you two values: x1≅0.0305 and x2≅-0.0392

Since the value of "x" represents a concentration, and cannot have negative values, the value of x2 is discarded. So: x=x1

Then:

[HI]= $0.275 \frac{moles}{L}-x$ = $0.275 \frac{moles}{L}-0.0305 \frac{moles}{L} = 0.2445 \frac{moles}{L}$

[H₂]= 0.0305 $\frac{moles}{L}$

[I₂]= 0.0305 $\frac{moles}{L}$

<u><em>The concentration of HI at equilibrium is 0.2445 </em></u> $\frac{moles}{L}$ <u><em></em></u>

4 0

3 years ago

Read 2 more answers

Why is it that no two elements have the exact same emission spectrum?​

Why is it that no two elements have the exact same emission spectrum?