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
larisa86 [58]
3 years ago
9

Fireworks that contain metallic salts such as sodium, strontium, and barium can generate bright colors. a technician investigate

s what colors are produced by the metallic salts by performing flame tests. during a flame test, a metallic salt is heated in the flame of a gas burner. each metallic salt emits a characteristic colored light in the flame. 72 explain why the electron configuration of 2-7-1-1 represents a sodium atom in an excited state. [1]
Chemistry
1 answer:
Tasya [4]3 years ago
7 0

Answer is: The electrons moved from the second energy level to the fourth.

Atomic number (Z) of sodium is 11, it means that it has 11 protons and 11 electrons, so atom of sodium is neutral.

Electron configuration of sodium atom in a ground state:

₁₁Na 1s² 2s² 2p⁶ 3s¹ or 2-8-1-0.

In a ground state of sodium atom, fourth energy level is empty.

In a excited state electron from second energy level (2s² 2p⁶) moves to fourth energy level.

You might be interested in
Olivia, a Latina student, is told that she can check only two books out of the library at a time, but Leann, a white student, is
Sliva [168]

Answer:

a

Explanation:

the others are rude, and rather support this, while a helps to support the ending of white privlige

4 0
3 years ago
Read 2 more answers
What is a non-example of an electrical conductor?
goblinko [34]

Answer: Sulphur, Phosphorus, Wood are non-conductors of electricity due to no presence of free electrons in outermost shell.

Explanation:

3 0
2 years ago
Read 2 more answers
Write the balanced equation for the decomposition of hydrogen peroxide to form water and oxygen.
Lerok [7]
Hydrogen peroxide is H2O2, while water is H2O and oxygen (a diatomic gas) is O2. The (unbalanced) reaction is:
H2O2 --> H2O + O2
Notice that the H2O2 has 2 H atoms, and so does H2. This means that both must have the same coefficients, and we can adjust the coefficient of O2. Since H2O2 has 2 O atoms, and H2O has 1, we multiply O2 by 1/2:
H2O2 --> H2O + (1/2)O2
This has an equivalent number of H and O atoms on either side, but we want the coefficients to be whole numbers, so we multiply everything by 2:
2H2O2 --> 2H2O + O2
7 0
3 years ago
Which statement is NOT correct? a. An activated complex has higher energy than any molecule contributing to it. b. If the forwar
Gnom [1K]

Answer:

<em>C.Activation energy is the same in the forward and reverse direction.</em>

<em>Explanation:</em>

<em>All these are true statements expect for option "C"</em>

5 0
3 years ago
Read 2 more answers
Aplica el método científico. Toma en cuenta que el desplazamiento de un vehiculo , el paso de la electricidad por los cables la
Daniel [21]

Answer:

Revisa con detalle la explicación.

Explanation:

¡Hola!

En este caso, debemos tener en cuenta que los pasos básicos del método científico son:

- Observación.

- Experimentación.

- Registro de datos.

- Análisis.

- Conclusiones

Para el primer caso (desplazamiento de un vehiculo), consideramos la primera ley de Newton o también ley de inercia en la cual explica que un cuerpo se mantendrá en reposo o en constante movimiento hasta el momento en que se aplica una fuerza externa.

Con los pasos del método científico encontramos que para el desplazamiento de un vehiculo se encuentra inicialmente en reposo pero luego se aplica una fuerza que hace que se mueva. Luego para la experimentación, se realiza un experimento con un carro de juguete (por ejemplo) inicialmente en reposo y al que se le aplica una fuerza para moverlo, con lo que se realiza el análisis y finalmente se obtiene la conclusión a la que llegó Newton.

Paso de electricidad: cuando se observa que hay algún dispositivo encendido, es posible usar un voltímetro para comprobar dicho paso por medio de mediciones.

Combustion del papel: cuando se enciende un trozo de papel con fuego y se observa que convierte en ceniza, es posible realizar el experimento con el fin de llegar a la conclusión de que al reaccionar con oxígeno, cambia la escructura de la celulosa a carbon, dióxido de carbono, agua y otros residuos.

Asimismo, al llevar a cabo experimentos de coagulación de la sangre en una herida y como los nutrientes obtenidos de los alimentos se convierten en energía para nosotros, podemos llegar a las conclusiones de que la sangre se coagula debido la existencia de plaquetas y que los alimentos se convierten en energía a partir de las enzimas que tenemos dentro de las células que los degradan en glucosa y lípidos reutilizables.

¡Saludos!

8 0
3 years ago
Other questions:
  • By what factor will the kinetic energy change if the speed of the baseball is decreased to 54.8 mi/h? Express your answer as an
    13·1 answer
  • What is conductivity?
    6·2 answers
  • Stars were classified first by the strength of the hydrogen lines in their spectra, and then by temperature. Which arrangement o
    14·1 answer
  • Suppose you have been given the task of distilling a mixture of hexane + toluene. Pure hexane has a refractive index of 1.375 an
    15·1 answer
  • If an atom has an atomic number of 6 and and abdomens mass of 12 how many electrons does it have
    14·1 answer
  • When lithium reacts with bromine to form th. Compound LiBr, each lithium atom gains one electron and becomes a negatively charge
    12·1 answer
  • Fission and fusion are alike in many ways. However, one difference is
    11·1 answer
  • What is a star, and how do they work
    7·2 answers
  • How do you calculate annual layers of snow from the past?
    6·1 answer
  • Question 12 of 25
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!