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How do you know if an enthalpy change diagram is endothermic or exothermic?
If you plot the reaction coordinate (what I think you mean by "enthalpy change diagram"), the reaction will be exothermic if the products are lower on the graph than the reactants. If they are higher than it is endothermic. For instance, if you go to the linked Wikipedia page (link to the left of this answer), the graph shown is of an exothermic reaction.
Why do chemists need to know the factors that affect reaction rates?
It is important to control chemical reactions in industry.
Is charcoal burning in a grill physical or chemical?
Its a chemical change because the properties of charcoal are changing when fire makes contact with it. It is realising energy and that is one of the most important signs to know if it is a chemical reaction.
How we know a chemical change has occurred when burning a candle?
Burning is a chemical reaction, an oxydation.
Why do you have to balance chemical equations?
You only need to balance a chemical equation if you want to know the proportions (how many of each type of molecules participate in the reaction).You only need to balance a chemical equation if you want to know the proportions (how many of each type of molecules participate in the reaction).You only need to balance a chemical equation if you want to know the proportions (how many of each type of molecules participate in the reaction).You only need to balance a chemical equation if you want to know the proportions (how many of each type of molecules participate in the reaction).
How much heat is absorbed when 3.20 moles of A of react?
The answer to this question will depend on what the substance that is reacting is. You will need to find the appropriate standard enthalpy value, which corresponds to the amount of enthalpy change when one mole of matter is transformed by a chemical reaction in standard conditions.
How do you know if an enthalpy change diagram is endothermic or exothermic?
If you plot the reaction coordinate (what I think you mean by "enthalpy change diagram"), the reaction will be exothermic if the products are lower on the graph than the reactants. If they are higher than it is endothermic. For instance, if you go to the linked Wikipedia page (link to the left of this answer), the graph shown is of an exothermic reaction.
How do you know if a reaction is entropy driven enthalpy driven or driven by both enthalpy and energy?
If the ∆H is positive and the ∆S is positive, then the reaction is entropy driven. If the ∆H is negative and the ∆S is negative, then the reaction is enthalpy driven. If ∆H is positive and ∆S is negative, then the reaction is driven by neither of these. If ∆H is negative and ∆S is positive, then the reaction is driven by both of these.
How much heat will be released when 6.44 grams of sulfur reacts with excess iron oxide?
You need to know the ∆H of this reaction, or the enthalpy change. If you know the enthalpy change, then convert the 6.44 g of sulfur to moles, and use stoichiometry to determine what fraction of a mole was reacted, and multiply that time the value of ∆H of the reaction
Why do chemists need to know the factors that affect reaction rates?
It is important to control chemical reactions in industry.
What is stored molecular energy called?
Energy stored in chemical bonds of molecules is referred to as chemical energy.This is known as 'enthalpy'.The type of energy that is stored in a molecules bonds is potential energy. This energy can also be called bond energy.It is important to know the different kinds of energy. Potential energy is the energy that is stored in chemical bonds.
Does an exothermic reaction contain more chemical energy than reactants?
depends , if the reaction is endothermic or exothermic. if the reaction is endothermic , the energy needed to break the bonds is greater than the energy that forms bonds.and to break bonds you need thermal energy , meanwhile forming bonds gives off energy. now if the reaction is exothermic the energy given off the bonds form are greater than the enrgy needed to break them. you know if the reaction is exothermic or endothermic because exothermic have a negitave delta next to d eqn.while endothermic have a positive delta.
What are the five ways to know that chemical reaction happened?
don't know
Is charcoal burning in a grill physical or chemical?
Its a chemical change because the properties of charcoal are changing when fire makes contact with it. It is realising energy and that is one of the most important signs to know if it is a chemical reaction.
How is the change of H fusion related to the change of h of a reaction?
Change of H of fusion (∆Hfusion) is the enthalpy change going from solid to liquid or liquid to solid. That is, it is only for the phase change, and it is not accompanied by a change in temperature. It can be related to the ∆H of reaction but one would have to know the reaction to be more specific.
Is charcoal burn in a grill physical or chemical change?
Its a chemical change because the properties of charcoal are changing when fire makes contact with it. It is realising energy and that is one of the most important signs to know if it is a chemical reaction.
What is Energy stored in chemical bonds of molecules.?
Energy stored in chemical bonds of molecules is referred to as chemical energy.This is known as 'enthalpy'.The type of energy that is stored in a molecules bonds is potential energy. This energy can also be called bond energy.It is important to know the different kinds of energy. Potential energy is the energy that is stored in chemical bonds.
