Water molecules in the gas phase__________________

The formation of CsCl from Cs(s) and Cl2(g) involves the following steps:Cs(s)?Cs(g)12Cl2(g)?Cl(g)Cs(g)?Cs+(g)+e?Cl(g)+e??Cl?(g)

Crazy boy [7]

Answer:

The steps 1, 2 and 3 involve absorption of energy and steps 4, 5 involve release of energy.

Explanation:

The steps involved in the formation of caesium chloride (CsCl) are:

1) Cs(s) → Cs(g)

This step involves the phase transition of caesium from the solid phase to the gaseous phase, which is known as sublimation.

Sublimation is an endothermic process as it is caused by the absorption of energy.

2) Cl₂(g) → 2Cl(g)

This step involves breaking the Cl-Cl bond and the energy required for the separation of constituting atoms is called enthalpy of atomization or bond dissociation enthalpy.

Therefore, it also an endothermic process.

3) Cs(g) → Cs⁺(g) + e⁻

The energy needed for the removal of valence electron from the valence shell of gaseous caesium atom to form a cation is known as ionization energy.

It is also an endothermic process.

4) Cl(g) + e⁻ → Cl⁻(g)

The energy released when an electron is gained by a gaseous chlorine atom to form an anion is known as electron affinity.

Therefore, it is an exothermic process.

5) Cs⁺(g) + Cl⁻(g) → CsCl(s)

This step involves the formation of solid crystal directly from the gas by the release of energy. This process is known as crystallisation.

It is an exothermic process.

4 0

3 years ago

Use the helium-4 isotope to define atomic number and mass number. why does knowledge of atomic number enable us to deduce the nu

Nuetrik [128]

Helium - 4 isotope has 2 protons and 2 neutrons.

Its atomic number is 2 (the number of protons). Atomic number is the number of protons in the atom of an element and it identifies the element. All the isotopes of an element have the same atomic number (same number of protons). So, all the isotopes of hellium have 2 protons.

The number 4 that identifies the helium - 4 isotope is the mass number, i.e. the number of protons plus the number of neutron. So, helium-4 isotope has 2 protons and 2 neutrons. While, other isotopes of helium have 2 protons but different number of neutrons.

The atomic number enable us to deduce the number of electrons in an atom because the atoms are neutral, which implies that the positive and negative charge are equal. Given that the magnitude of the charge of electons and protons are equal but the sign is opposed (protons are positve and electrons are negative) the number of electrons in the atom equals the number of protonts. That is why the atomic number is also the number of electrons of the atom.

8 0

4 years ago

Write net ionic equations for the reaction, if any, that occurs when aqueous solutions of the following are mixed. ammonium sulf

aleksandr82 [10.1K]

Answer:

See explanation for details

Explanation:

ammonium sulfate and barium nitrate Answer ‍

Ba2+(aq) + SO4^2-(aq) ----------> BaSO4(s)

lead(II) nitrate and sodium chloride Answer ‍

Pb2+(aq) + 2Cl-(aq) -----------> PbCl2(s)

copper(II) chloride and sodium hydroxide Answer ‍ ‍ ‍ ‍ ‍

Cu2+(aq) + 2OH-(aq) -------------> Cu(OH)2(s)

There can only be a net ionic reaction when a precipitate is formed as the two solutions are mixed together.

4 0

3 years ago

Number 72 I need help

Mashutka [201]

A. Cs - 55 electrons, 55 protons, 77 neutrons
B. Co - 27 electrons, 22 protons, 32 neutrons
C. Tm - 69 electrons, 69 protons, 94 neutrons
D. Zn - 30 electrons, 30 protons, 40 neutrons

For any neutral atom, protons = electrons = atomic number. Neutrons = atomic mass - atomic number.

7 0

4 years ago

E. What is one way that your body knows if it is upside-down or not?

Firlakuza [10]

Answer:

You get some type of pressure that you start to feel in your muscles and joints from gravity and movement. How do they say it? Something called "seat-of-the-pants" (something like that). You get some type of pressure, and your body senses it, and it knows when you are upside-down or not, because if you're not, then you won't get any pressure in your muscle.

Hope this helped!

Have a supercalifragilisticexpialidocious day!

6 0

3 years ago

Water molecules in the gas phase___________________. *