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jek_recluse [69]
4 years ago
11

if scientist wants to retrieve the salt grom a sample of salwater,which of. the following should she do

Chemistry
2 answers:
Sergeeva-Olga [200]4 years ago
8 0

She should boil the water extracting the salt from the water through evaporation.

UNO [17]4 years ago
5 0
Boil then let vaporate
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Write the electron configuration​
ycow [4]

Answer:

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5

8 0
3 years ago
Consider the following equation for the combustion of acetone (C3H6O), the main ingredient in nail polish remover.
solong [7]

Answer:

a) 4869 kj will be released

b) 43.86 g of octane

Explanation:

The heat of combustion is the amount of heat released when one mole of a substance reacts with enough oxygen

since the heat of combustion is per mol of combustible substancewjat we are required to do in this problem is calculate number moles in the reactions although in a different manner

a) MW C3H6O = 158 g/ mol

mol C3H6O = 158 g × 1 mol/ 58.08 g

= 2.72 - 1790 kj / mol ×2.72 mol = 4869 kj

b) Here we are asked the mass of octane to produce 1950 kj of heat knowing that per mole of octane we get 5074.1 kj then

1 mol / 5074.1kj × 1950 kj= 0.384 mol

mass C8H18 = 0.384 mol × 114.23 g/ mol = 43.86 g

4 0
3 years ago
Read 2 more answers
Realice una historieta que resuma su comprensión acerca de la teoría atómica y los diferentes modelos atomicos que se
Tomtit [17]

Respuesta:

Los modelo atómicos han permitido representar el modo de funcionamiento de los átomos. A lo largo de la historia han surgido un numero de modelos atómicos diferentes incluyendo los modelos de Bohr, Thomson, Rutherford, Sommerfeld, Dalton y Schrödinger.

Explicación:

El modelo atómico propuesto por John Dalton (1808) demostró que las sustancias químicas reaccionan en proporciones fijas y cómo mediante su combinación se producen elementos diferentes. Dalton fue el primero en postular la existencia de elementos indivisibles llamados átomos. A continuación, Thomson (1904) desarrolló un modelo en el cual el átomo estaba compuesto por protones con carga positiva y electrones con carga negativa los cuales se incrustaban uniformemente dentro de este átomo, asemejándose a las pasas de uva de un budín. En 1911, Ernest Rutherford desarrolló un nuevo modelo donde la masa principal del átomo tenía carga positiva y se localizaban en el núcleo, mientras que los electrones con carga negativa se posicionaban en la región externa del átomo. Subsecuentemente, Niels Bohr (1913) represento el funcionamiento del átomo de hidrógeno mediante un protón inmóvil en el núcleo atómico y un electrón girando a su alrededor. El modelo atómico de Sommerfeld permitió generalizar el diagrama de Bohr a otros tipos de átomos mas allá del Hidrógeno, incluyendo diferentes niveles energéticos para cada átomo particular. El modelo de Schrödinger​ (1926) permitió corregir aquellas discordancias surgidas del modelo atómico de Bohr. Schrödinger incluyó diferentes niveles y subniveles de energía a los electrones e incorporó órbitas elípticas a su movimiento, con lo cual permitiendo predecir los efectos relativos de los campos magnético y eléctrico sobre el movimiento de los electrones.

4 0
3 years ago
The speed of the sound in air at room temperature is 343 m/s. Calculate this speed in miles per hour.
hjlf

Convert metres to feet:

343m*3.28f = 1,125.04ft/s

There are 3600 (60 seconds * 60 minutes) seconds in an hour. Therefore, use this number to convert to an hour.

1,125.04ft*3600s = 4,050,144 ft/h

Now, since you asked for miles, convert to miles (5280 ft in a mile):

4,050,144ft/5,280m = 767.072mph

That is your answer! Hope I helped. :)

6 0
3 years ago
Read 2 more answers
Describe the properties of noble gases. Based on their electronic arrangement, explain whether they can exist alone in nature.
Marizza181 [45]

The properties of noble gases include:

  • They are nonreactive
  • They have hight ionisation energy
  • They have low boiling point
  • They conduct electricity at low pressure.

The noble gases are those elements that makes up the group 18 of the periodic table.

They are non as the inert gases because they are relatively nonreactive.

According to the electronic arrangement, which is according to how the electrons are arranged on their shells, they can exist alone.

The noble gases are nonreactive, have high ionisation energy and low boiling point because in its electronic arrangement, the outer shell is completely full.

Learn more here:

brainly.com/question/19874646

3 0
3 years ago
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