1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
m_a_m_a [10]
3 years ago
11

Why does a salt compound give off light (or a colored flame) when burned? 4. did lithium chloride and sodium chloride give off s

imilar colors? why or why not? 5. explain what you think causes different compounds to give off different flame colors. 6. using your results, identify which substances you would put in a firework to delight a crowd of spectators?
Chemistry
2 answers:
Free_Kalibri [48]3 years ago
7 0

3) Answer is: because elements have different emmision spectrum.

Emission spectrum of a chemical element is the spectrum of frequencies emitted due to an atom making a transition from a high energy state to a lower energy state. Each element's emission spectrum is unique.

4) Answer is: lithium chloride and sodium chloride do not have similar colors.

Lithium ion has red and sodium ion has yellow emission spectrum.

5) Answer is: because metals have valence electrons in different energy shells.

Each transition has a specific energy difference.

6) Answer is: salts of alkaline and earth alkaline metals.

For example barium chloride gives green light.

timurjin [86]3 years ago
4 0

The salt compounds give off light due to their emission spectrum.

(4) \boxed{{\text{No}}}, lithium chloride and sodium chloride do not give off similar colors because of the difference in their emission spectrum.

(5) Flame colors are characteristics of \boxed{{\text{energy difference}}} between the two levels, which is different for different elements.

(6) \boxed{{\text{Salts of alkali and alkaline earth metals}}} can be put in a firework.

Further explanation:

Electronic transition:

An electronic transition is a process that occurs when an electron undergoes emission or absorption from one energy level to another energy level.

When an electron undergoes a transition from lower energy level to the higher energy level then it requires energy to complete the process. This transition is an absorption process.

When an electron undergoes a transition from higher energy level to lower energy level then it emits energy to complete the process. This transition is an emission process.

The formula to calculate the difference between two energy levels of an atom is,

\Delta E={R_{\text{H}}}\left({\frac{1}{{{{\left({{{\text{n}}_{\text{i}}}}\right)}^2}}}-\frac{1}{{{{\left({{{\text{n}}_{\text{f}}}}\right)}^2}}}}\right)  

Where,

\Delta E is the energy difference between two energy levels.

{R_{\text{H}}} is Rydberg constant.

{{\text{n}}_{\text{i}}} is the initial energy level of transition.

{{\text{n}}_{\text{f}}} is the final energy level of transition.

The salt compound gives off the light because its electrons absorb energy and get excited to some higher energy level. But when it returns to the lower level, it emits energy in the form of light, resulting in emission spectrum.

(4) No, lithium chloride and sodium chloride do not give off similar colors. This is because both these compounds have different allowed energy levels for their respective electrons. Lithium ion shows a red emission spectrum while sodium ion shows yellow emission spectrum.

(5) Different elements have different allowed energy levels for electrons. When an atom is heated, it absorbs energy and reaches some higher energy level. When an electron jumps from higher energy level to lower energy level, it emits energy in form of light. The wavelength of light depends on the energy difference between the two levels, which is different for different elements, and therefore different elements show different flame colors.

(6) Salts of alkali and alkaline earth metals can be used in fireworks as these are highly electropositive metals and give off electrons so easily and bright colored flames are produced. For example, barium chloride gives off the green flame when burned.

Learn more:

1. Component of John Dalton’s atomic theory: <u>brainly.com/question/2357175 </u>

2. Basis of investigation for the scientists: <u>brainly.com/question/158048 </u>

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Atomic structure

Keywords: electronic transition, barium chloride, colored flames, alkali, alkaline earth metals, electropositive, emission, absorption, electrons, allowed energy levels, higher level, lower level.

You might be interested in
Many scientist compare the parts of a cell to the parts of a factory. Do you think this comparison is fair and useful?
Fittoniya [83]
Yes. Parts of a cell work together just like stations in a factory.
4 0
3 years ago
Science 7 Grade 7. Can anyone please help me answer these science questions?
masha68 [24]
A cellphone battery is a electrical energy 
and a piston in an engine is an thermal energy
6 0
3 years ago
Read 2 more answers
The missing components in the table to the right
Fed [463]

The missing components in the table to the right are indicated with orange letters. Use the periodic table in the tools bar and this link Web Elements to fill in the corresponding values. A B C D E F G. 2. See answers. Log in to add ... F = 737.7kJ/mol. G = 495.8kJ/mol. Explanation: We are asked some of the ...

2 answers

4 0
3 years ago
The ion n3− has _____ protons and _____ electrons.enter your answers as integers separated by a comma.
bearhunter [10]
The ion N³⁻ is called the azide ion. In its neutral state, it occurs as the element Nitrogen. The atomic number of Nitrogen is 7. When it turns into an anion (negatively charged ion), it gains 3 more electrons. That's why its net charge becomes -3. It means that the protons is still 7, but the electrons are now 10. 

Overall charge = +7 + -10 = -3
5 0
3 years ago
Read 2 more answers
If 1.0 mole of neon, 2.0 moles of helium, and 3.0 moles of argon are mixed, what is the mole fraction of helium?
alexandr1967 [171]

The mole fraction of helium is 0.33.

The mole fraction can be calculated with the aid of dividing the number of moles of 1 factor of an answer by means of the overall number of moles of all the additives of a solution. it's far noted that the sum of the mole fraction of all the components in the solution should be same to one.

Mole fraction is a unit of attention. within the answer, the relative amount of solute and solvents are measured by the mole fraction and it is represented. The mole fraction is the wide variety of moles of a specific thing within the solution divided by way of the entire wide variety of moles.

Mole fraction represents the quantity of molecules of a selected thing in a combination divided by using the total variety of moles within the given mixture. it is a manner of expressing the concentration of a solution. consequently, the sum of mole fraction of all of the additives is always equal to one.

Mole of neon = 1

mole of helium = 2

mole of argon = 3

Total mole = 1 + 2 + 3 = 6

Mole fraction = mole of helium / total mole

                      =  2 / 6 = 0.33

Learn more about mole fraction here:-brainly.com/question/1601411

#SPJ4

7 0
1 year ago
Other questions:
  • A substance that cannot be separated into simpler substances by physical or chemical means is a
    15·1 answer
  • Why does a higher concentration increase the rate of reaction?
    13·1 answer
  • Can someone find the independent variable and the dependent variable ? :)))
    8·1 answer
  • A balloon is filled with 0.75 L of Helium gas at 35 °C. If the temperature is increased to 113 °C, what thewill new volume be?
    15·1 answer
  • Why does moon have different appearance?<br><br>NONSENSE = REPORT ​
    10·1 answer
  • What is the energy produced through cellular respiration called?
    8·1 answer
  • What is the mass number of 19/9F?<br> Your answer:<br> A. 9<br> B. 10<br> C. 19<br> D. 28
    7·1 answer
  • What are the products?
    8·2 answers
  • You have 16.0 g of some compound and you perform an experiment to remove all of the oxygen, 11.2 g of iron is left. What is the
    6·1 answer
  • Methane (CH4), is said to be the cleanest burning fossil fuel. When burned, it releases carbon dioxide gas and forms water. Usin
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!