No, when H and S are both negative, the reaction will only be spontaneous below a certain temperature
G is always negative when H is negative and S is positive.
It will always be negative.
Yes, the product of three negative numbers is always a negative number.
They are always negative due to a negative plus a negative equaling a negative. It's similar to a positive plus a positive equaling a positive.
A percentile is always between 0% and 100%, never negative.
No, many exothermic reactions need the heat of activation to start the reaction. Paper, for instance, does not spontaneously burst into flame... you need to raise its temperature to the kindling point for it to burn.
The spontaneity of a reaction is determined by the sign of the Gibbs free energy (ΔG). If both enthalpy (H) and entropy (S) are positive, the reaction can be spontaneous at high temperatures where the TΔS term outweighs the positive ΔH term, resulting in a negative ΔG. This means the reaction will be spontaneous at elevated temperatures.
Chemical bonds always break in chemical reactions, causing changes in energy.
No, chemical reactions can be endothermic or exothermic.
Chemical bonds always break in chemical reactions, causing changes in energy.
No, the spontaneity of reactions is not always associated with exothermic heat release. Some spontaneous reactions can be endothermic, meaning they absorb heat from their surroundings.
always.
Whether a reaction took place is determined by the change in chemical composition, the formation of new substances, the release of energy or heat, and the color change or visible evidence of a chemical change. These factors indicate that a chemical reaction has occurred.
no
Reactions are described by this equation: GD = HD - TDS where D = delta for change in values. GD < 0 spontaneous HD < 0 exothermic ; HD > 0 endothermic The first equation is Gibbs free energy. When G is negative, the reaction is spontaneous. In contrast, a positive number G is non spontaneous. The interesting thing is that spontaneous reactions can be EITHER exothermic and endothermic. Lets look at this: lets assume HD has a value of 100. This means TDS would have to be bigger than 100 in order to make GD a negative number. An endothermic reaction which has a positive H can still be exothermic. Here's another way to pose your question: Is an exothermic reaction spontaneous? Always. Is an endothermic reaction spontaneous? This can be either.
Fluorine is the most electronegative element, meaning it has a strong tendency to gain electrons in chemical reactions. This leads to a stable octet configuration, resulting in a negative oxidation number (-1) when forming compounds.
Chemical reactions have always existed in nature. The study and understanding of chemical reactions has evolved over time, with early contributions from alchemists and philosophers, and further developments by scientists such as Antoine Lavoisier and John Dalton. There is no single person who can be credited with "inventing" chemical reactions.