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balu736 [363]
4 years ago
6

Water boiling and turning into steam is a chemical or physical change?

Chemistry
2 answers:
olga2289 [7]4 years ago
8 0

Answer:

physical change

Explanation:

andrezito [222]4 years ago
5 0

Answer:

Explanation:

It's a physical change.

The water does not change its chemical composition. No bonds are rearranged. The shape of the molecules remains the same. Nothing has altered except the distance between molecules and the motion of them.

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Describe how water is a destructive force to land features on the surface of the Earth and provide at least three examples. Desc
Leni [432]

Answer:

flooding and land erosion

7 0
3 years ago
An atom of helium is smaller in width then an atom of hydrogen, but it's more then twice the mass. Why are these different?
VLD [36.1K]

Answer:

i think it cuz ones broken down by fision more

Explanation:

6 0
3 years ago
If 0.40 mol of H2 and 0.15 mol of O2 were to react as completely as possible to produce H2O what mass of reactant would remain?
liberstina [14]

Answer : The mass of reactant H_2 remain would be, 0.20 grams.

Solution : Given,

Moles of H_2 = 0.40 mol

Moles of O_2 = 0.15 mol

Molar mass of H_2 = 2 g/mole

First we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

2H_2+O_2\rightarrow 2H_2O

From the balanced reaction we conclude that

As, 1 mole of O_2 react with 2 mole of H_2

So, 0.15 moles of O_2 react with 0.15\times 2=0.30 moles of H_2

From this we conclude that, H_2 is an excess reagent because the given moles are greater than the required moles and O_2 is a limiting reagent and it limits the formation of product.

The moles of reactant H_2 remain = 0.40 - 0.30 = 0.10 mole

Now we have to calculate the mass of reactant H_2 remain.

\text{ Mass of }H_2=\text{ Moles of }H_2\times \text{ Molar mass of }H_2

\text{ Mass of }H_2=(0.10moles)\times (2g/mole)=0.20g

Therefore, the mass of reactant H_2 remain would be, 0.20 grams.

3 0
3 years ago
A central atom has two lone pairs on opposite sides and four single bonds. What is the molecule geometry of the result?
ryzh [129]

The molecular geometry is square planar.

According to the Valence Shell Electron Pair Repulsion theory (VSEPR), the shape of a molecule is determined by the number of valence electrons surrounding the outermost shell of the central atom in the molecule.

In this case, the expected geometry based on VSEPR theory is octahedral. However, the lone pairs on opposite sides of the four single bonds leads to a square planar molecular geometry.

Learn more; brainly.com/question/24396703

8 0
3 years ago
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
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