The atoms in a sample of an element are in excited states. A bright-line spectrum is produced when these atoms A. absorb energy B. absorb positrons C. emit energy D. emit positrons

Answers

Answer 1

Answer: The correct answer is C. To produce a bright-line spectrum, atoms will need to give off energy to then show this light. Emit means to give something off externally, so the answer is emit energy. A is incorrect because absorbing energy would be the opposite of C, because the atoms would be taking in rather than giving off light. Also, light is a form of energy, not a positron (which has the same mass as an electron but with a positive charge), making both B and D incorrect.

Answer 2

Answer:

A bright-line spectrum is produced when the atoms in a sample of an element $\boxed{{\text{C}}{\text{. emit energy}}}$ .

Further explanation:

Atomic electronic transition:

When an atom jumps from one energy level to another energy level, an atomic electronic transition is said to take place. This occurs either due to the absorption or emission of energy by the electron.

When the transition of an atom takes place from lower to higher energy levels by the absorption of energy, it is known as an absorption process. But when atom jumps from higher to lower energy level, it releases or emits energy and therefore the process is called an emission process.

The lowest energy state of an atom is called the ground state and its energy is known as zero-point energy. It is the most stable energy level of an atom. But the state that has energy higher than that of the ground state is called an excited state. Excited states are unstable as compared to the ground state and atoms in such states tend to lose energy and jump back to the lower energy levels.

Since the atom of the sample bright-line present in the excited states, a bright-line spectrum is observed only if it emits some amount of energy and comes back to the lower energy level.

Learn more:

Component of John Dalton’s atomic theory: brainly.com/question/2357175
Basis of investigation for the scientists: brainly.com/question/158048

Answer details:

Grade: Senior School

Chapter: Atomic structure

Subject: Chemistry

Keywords: transition, ground state, excited state, energy, absorption, emission.

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What is a disadvantage of using a structural model to show a chemical compound? Structural models provide minimal three-dimensional information. Structural models do not identify the number and type of each atom. Structural models cannot distinguish between single, double, and triple bonds. Structural models cannot distinguish between different isomers of a compound.

Answers

The answer is the first: that structural models provide minimal three-dimensional information. This is because the ball-and-stick model cannot show the actual size of the atoms depicted in the model. You also cannot see the actual bond lengths between the atoms. This, then, limits the accuracy of the model and fails to precisely portray how the chemical compounds being shown are like in all actuality. Thus, though you do see a three-dimensional picture of the chemical compound, this picture is not completely accurate and is not scaled to size.

Answer: A - Structural models provide minimal three-dimensional information.

Explanation:

The empirical formula of styrene is CH; its molar mass is 104.1 g/mol. What is the molecular formula of styrene?A) C2H4
B) C8H8
C) C10H12
D) C6H6
E) none of these

i got C8H8 because i did
MWEF=n

but it says the answer should be C2H4

how is that possible?

Answers

You got the answer correct. If you would double check
given:C (12 g/mol) H (1 g/mol).

12(8) + 1(8) = 104 g/mol

and for C2H4
12(2)+1(4) = 28g/mol

Also, chemical formula of styrene is C6H5CH=CH2.

1. Find the molecular formula of styrene

Molecular formula = n x empirical formula

n= 104.14/13.02 = 8 where 13.02 is the empirical mass of CH

Molecular formula = CH x 8
= C8H8

2. From step 1, one molecule of styrene contains 8 atoms of hydrogen or one mole of styrene molecules contains 8 moles of hydrogen atoms (remember the formula of styrene is C8H8).

3. Convert 3.49 g styrene to mole styrene

mole styrene = 3.49 g/104.14 g/mol = 4.71 x 10^-3 mole

4. Calculate mole of hydrogens equivalent to 4.71 x 10^-3 mole styrene. Use mole ratio from step 2.

mole H = 4.71 x 10^-3 mole styrene * 8 moles H/1 mole styrene

mole H = 0.0377 mole

5. Find number of H atoms contained in 0.0377 mole of hydrogen atoms. Use Avogadro's number.

no. of H atoms = 0.0377 mole H * 6.02 x 10^23 atoms H/1mole H

no. of H atoms = 2.27 x 10^22 atoms H

Boyle's law deals what quantities?

Answers

Boyle's law deals with pressure and volume.

What is Boyle's law?

Robert Boyle studied the relationship between the pressure p and the volume V of a confined gas held at a constant temperature.

Boyle observed that the product of the pressure and volume are observed to be nearly constant.

The product of pressure and volume is exactly a constant for an ideal gas.

PV = constant

As per Boyle’s law, any change in the volume occupied by a gas (at constant quantity and temperature) will result in a change in the pressure exerted by it. In other words, the product of the initial pressure and the initial volume of a gas is equal to the product of its final pressure and final volume (at constant temperature and number of moles).

Therefore, Boyle's law deals with pressure and volume.

Learn more about Boyle's law, here:

brainly.com/question/30367067

#SPJ3

Boyle's law states that P1V1= P2V2.
Pressure= P
Volume= V

Pressure involves torr, atm, kPa,etc..
Volume involves mls/ milliter, l / liter, etc...

Given the redox reaction:Cr3+ + Al-->Cr + Al3+
As the reaction takes place, there is a transfer of
(1) electrons from Al to Cr3+
(2) electrons from Cr3+ to Al
(3) protons from Al to Cr3+
(4) protons from Cr3+ to Al

Answers

Answer: (1) electrons from Al to $Cr^(3+)$

Explanation: Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

For the given reaction:

$Cr^(3+)+Al\rightarrow Cr+Al^(3+)$

The oxidation state of chromium reduces from +3 to 0, it is getting reduced and gains electrons. The oxidation state of aluminium increases from 0 to +3. Thus, it is getting oxidized and it loses electrons. Thus electrons are transferred from $Al$ to $Cr^(3+)$

In this reaction, Al lose electrons and change to Al3+. Cr3+ gain electrons and change to Cr. So the electrons transfer from Al to Cr3+. Protons will not transfer in a chemical reaction. So the answer is (1).

When the ideal gas law constant 0.0821 is used, what unit of pressure should be used in the ideal gas law calculation?

Answers

The pressure unit is in atmospheres or atm. To confirm this from the ideal gas equation:

R = VP/nT

plugging in the standard values of pressure, temperature and molar volume,

R = (22.4L/mo)l(1atm)/(273.15K) = 0.0821

Find the mistake C2H4(g) + 2O2(g) → 2CO2(g) + 2H2(g)

Answers

this equation is a combustion reaction. a combustion reaction must have carbon dioxide and water as products.

yours only had carbon dioxide and no h2o

therefore it is wrong

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