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3 years ago

What must models and theories do in order to remain valid? Provide 2 facts.

Chemistry

2 answers:

Sunny_sXe [5.5K]3 years ago

8 0

Answer:

1. Models and theories should explain known fact.

2. Models and theories should enable scientists to make accurate deductions and predictions.

Explanation:

A model involves the use of a physical, conceptual, or mathematical representation to describe a real phenomenon that could not be understood by mere direct observation. It could be in the form of a diagram or picture, aircraft model kit etc.

A theory is a well tested and confirmed phenomenon through repeated observations and experiments. It is a stronger assertion that explains the facts about a phenomenon. Such are not guesses or mere saying, but reliable accounts of some phenomenon in the real world.

Therefore for models and theories to be valid, they must explain known facts and enable scientists to make accurate predictions.

Andrews [41]3 years ago

6 0

Do what they was made to do

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3 years ago

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sleet_krkn [62]

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3 years ago

How do synthesis reactions and a decomposition reactions differ

Minchanka [31]

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3 years ago

In a reaction of a potential new fuel, it is found that when 2.81 moles of the fuel combusts, 1,612 kJ of energy is released. Wh

Tema [17]

Answer:

-573.67

Explanation:

whenever energy is released in a chemical reaction, we would then expect the delta H of the reaction to be negative because the reaction is an exothermic reaction.

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thus, 1 mole will release 1612/2.81 = -573.67kJ of heat

Therefore the delta H of the reaction = -573.67 kJ/mol

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2 years ago

Hydrogen gas and fluorine gas will react to form hydrogen fluoride gas. What is the standard free energy change for this reactio

Marta_Voda [28]

Answer:

$\Delta G=-541.4kJ/mol$

Explanation:

Hello there!

In this case, according to the given information, it turns out firstly necessary to write out the described chemical reaction as shown below:

$H_2+F_2\rightarrow 2HF$

Now, we set up the expression for the calculation of the standard free energy change, considering the free energy of formation of each species, specially those of H2 and F2 which are both 0 because they are pure elements:

$\Delta G=2\Delta G_f^{HF}-(\Delta G_f^{H_2}+\Delta G_f^{F_2})\\\\\Delta G=2*-270.70kJ/mol-(0kJ/mol+0kJ/mol)\\\\\Delta G=-541.4kJ/mol$

Regards!

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2 years ago