Answer:
The answer to your question is: second option.
Explanation:
An exothermic reaction is a reaction that releases energy to the environment.
Thermal energy is absorbed by the system.
This sentence is describing an endothermic reaction.
Thermal energy is absorbed by the surroundings.
This sentence is describing an exothermic reaction.
Thermal energy is not transferred. This sentence is describing an isolated system.
The initial and final temperatures of the system remains the same. This option is incorrect is not describing an exothermic reaction.
The correct answer is:
B; A new substance forms.
Explanation:
A physical change, such as a state change or dissolving, does not produce a new substance, but an abundant change does. In a chemical reaction, the atoms and molecules that connect with each other are described as reactants. Chemical reactions happen when chemical bonds are broken and formed. If the molecules in a substance crash into each other with enough energy, some of the bonds in the molecules can break. The atoms can make new bonds with different atoms. A new substance forms.
The balanced equation for the neutralization reactions is as below.
<h3>Balancing chemical reaction equations</h3>
In order for chemical equations to be balanced, the number of atoms of each element before and after the reaction must be equal.
Thus:
More on balancing chemical equations can be found here: brainly.com/question/15052184
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Answer:
K(79°C) = 1.906 E7 s-1
Explanation:
Arrhenius eq:
∴ A = 5.0 E9 s-1
∴ Ea = 16.3 KJ/mol
∴ R = 8.314 E-3 KJ/K.mol
∴ T = 79°C ≅ 352 K ⇒ K = ?
⇒ K(79°C) = (5.0 E9 s-1)e∧[ - (16.3KJ/mol)/(8.314 E-3 KJ/K.mol)(352 K)]
⇒ K(79°C) = (5.0 E9 s-1)e∧(- 5.5697)
⇒ K(79°C) = (5.0 E9 s-1)*(3.811 E-3)
⇒ K(79°C) = 1.906 E7 s-1