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Alona [7]
3 years ago
7

Which of the following are observations? The candle floats. The tires are flat. The dog is barking. The tire is flat because of

a decrease in temperature. If a person walks by, then the dog will bark.
Chemistry
2 answers:
matrenka [14]3 years ago
8 0

Answer:

The first three statements, that is, the candle floats, the tires are flat, and the dog is barking are observations.

Explanation:

Observation refers to the process or action of observing someone or something cautiously in order to attain a certain kind of information. Thus, the first three given statements are examples of observations, while the last two statements imply the concept of cause-effect relationships. The cause and effect refer to an association between the things or the incidents, where one is the outcome of the other or the others. This is an amalgamation of action and reaction.

Liula [17]3 years ago
6 0
Everything but "<span>The tire is flat because of a decrease in temperature" is an observation.</span>
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Give the half equation to show what happens to oxygen when it is rusting
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Answer:

½O 2 + 2e - + H 2O → 2OH.

Explanation:

Redox reactions - Higher

In terms of electrons:

oxidation is loss of electrons

reduction is gain of electrons

Rusting is a complex process. The example below show why both water and oxygen are needed for rusting to occur. They are interesting examples of oxidation, reduction and the use of half equations:

iron loses electrons and is oxidised to iron(II) ions: Fe → Fe2+ + 2e-

oxygen gains electrons in the presence of water and is reduced: ½O2 + 2e- + H2O → 2OH-

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Above pH 8.3, a blue litmus paper stays blue but turns red in an acid. A neutral solution, or one between the upper and lower values of litmus paper, pH 4.5 and 8.3, will not change the paper's color

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8. Select the lattice energy for rubidium chloride from the following data (in kJ/mol]
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Answer:

Option C

Explanation:

The chemical reactions which are involved while solving this problem is there in the file attached and each chemical reaction is represented by a certain equation number

Lattice energy for rubidium chloride ( RbCl) is represented by the equation 6

Equation 1 represents the change in enthalpy for formation of RbCl

Equation 2 represents the sublimation reaction of rubidium

Equation 3 represents the ionization enthalpy of rubidium

Equation 4 represents the enthalpy of atomization of chlorine which means it describes the bond enthalpy of Cl2 molecule

Equation 5 represents the electron affinity of chlorine

To find the lattice energy for RbCl we have to use all the equations from 1 to 5 so that at last we get the equation 6

We have to perform operations such as

Equation 1 - equation 2 - equation 3 - equation 4 - equation 5

By performing these operations the intermediate compounds gets cancelled and at last we get equation 6

So Equation 1 ≡  ΔH_{f} = -431 kJ/mol

Equation 2 ≡ Rb(s) ---> Rb(g) = 85.8  kJ/mol

Equation 3 ≡ IE1(Rb) = 397.5  kJ/mol

Equation 4 ≡ BE(Cl2) = 226  kJ/mol

Equation 5 ≡ Electron Affinity Cl = -332  kJ/mol

Value corresponding to the equation 6 will be the value of lattice energy of RbCl and the value is -695·3 kJ/mol

∴ Lattice energy for rubidium chloride is approximately -695 kJ/mol

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