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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 else can I help you with?
How do the reactants of a chemical reaction differ from the products of the same reaction?
Reactants are the starting materials that are present at the beginning of a chemical reaction, while products are the substances that are formed as a result of the reaction. Reactants undergo a chemical change to form products during the reaction.
In a combustion reaction between butane and oxygen which contains more energy reactants catalyst products or products and reactants contain the same amount of energy?
In a combustion reaction between butane and oxygen, the products contain more energy than the reactants. This is because energy is released in the form of heat during the combustion process, increasing the total energy content of the products. The catalyst does not contribute to the overall energy content of the reaction.
What causes exothermic reactions?
Exothermic Reactions occur when a chemical reaction releases energy in the form of heat. This is the opposite of endothermic reactions in which energy is absorbed. In exothermic reactions, usually the reactants have a higher energy level than the products do. These reactions are typically caused when the enthalpy change value is a negative number (energy used in bond breaking reactions − energy released in bond making products). Combustion is an example of a exothermic reaction.
The only reactants in a reaction were Zn and HCI. What does the law of conservation of matter say about the products?
The law of conservation of matter states that matter cannot be created or destroyed in a chemical reaction. Therefore, the total mass of the products formed from the reaction between Zn and HCl must be equal to the total mass of the reactants.
If the products of a reaction are NaCl and H2O what does the law of conservation of mass reveal about the reactants in the reaction?
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. Therefore, for the products NaCl and H2O to be formed, the reactants must contain the same amount of sodium, chlorine, and hydrogen atoms as found in NaCl and H2O, respectively.
In a chemical reaction the reactants contain 385 kJ of chemical energy and the products contain 366 kJ of chemical energy?
In this chemical reaction, the reactants have 385 kJ of chemical energy, while the products have only 366 kJ. This indicates that the reaction is exothermic, as it releases energy in the form of heat, resulting in a net loss of 19 kJ of energy. The difference represents the energy released to the surroundings during the reaction.
How do the reactants of a chemical reaction differ from the products of the same reaction?
Reactants are the starting materials that are present at the beginning of a chemical reaction, while products are the substances that are formed as a result of the reaction. Reactants undergo a chemical change to form products during the reaction.
The reactants contain 385 kJ of chemical energy and the products contain 366 kJ of chemical energy in order for energy to be conserved what must happen?
In order for energy to be conserved during a chemical reaction where the reactants contain 385 kJ of chemical energy and the products contain 366 kJ, the difference of 19 kJ must be released to the surroundings. This energy is typically lost as heat, light, or sound, indicating that the reaction is exothermic. The law of conservation of energy states that energy cannot be created or destroyed, only transformed, so the released energy accounts for the discrepancy between the energy of reactants and products.
What information does chemical information contain?
the reactants and products. reactants=what compounds or elements are reacting products= what compounds or elements are produced from the reaction
How is an exothermic reaction indicated in an eq?
heat is included as one of the products cause : a-p-e-x quiz !
What must be true about the properties of the reactants and the properties of the products in a chemical reaction?
The reactants and the products must contain the same numbers of the same types of atoms, that is, atoms with the same atomic number, and either the products must contain at least one type of chemical bond distinct from any chemical bond in the reactants or the reactants must contain at least one type of chemical bond not found in the products.
Do the bonds of the products contain more or less energy than the original compounds?
In a chemical reaction, the bonds of the products may contain more or less energy than the original compounds, depending on the specific reaction and the energy required to break and form bonds. If the reaction is exothermic, the products will have lower energy bonds than the reactants, whereas in an endothermic reaction, the products will have higher energy bonds.
In a chemical reaction the reactants contain 385 kJ of chemical energy and the products contain 366 kJ of chemical energy. In order for energy to be conserved what must happen?
In a chemical reaction, energy must be conserved, so the difference in energy between the reactants and products must be accounted for. Since the reactants contain 385 kJ and the products contain 366 kJ, there is a net release of 19 kJ of energy. This energy is typically released as heat or light into the surroundings, ensuring that the total energy of the system and its environment remains constant.
What is chemical reaction that gives off heat called?
Exothermic reactions give off heat.
When looking at a chemical reaction how do you know what the reactants and products are?
In an equation the reactants are the on the left of the arrow, and the products are on the right. For example if you had the following equation: 2H2 + O2 => 2H2O 2H and O will be the reactants and H2O is the product.
How do chemical reaction change substances?
After a chemical reaction, some of the bonds have been broken, and some new bonds have been formed. So, that's how a substance is changed after the reaction.
How do you know it is a exothermic reaction?
If you are in a lab and want to tell whether a reaction was exothermic, carefully check the temperature of the reaction vessel. If the reaction was exothermic, the vessel will be warmer than it was before the reaction occurred. If you are looking at a reaction on paper, you will need a table of thermodynamic data. It should contain the molar enthalpies of formation, represented by H, of each of the reactants and products (note: if a reactant or product is an element in its most stable state, like H2(g) or Zn(s), the enthalpy of formation is defined as zero, so they may be left out of the table). Multiply the number of moles of each product and reactant by its molar enthalpy. Add up all the results for the products and subract all the results for the reactants. If your net result is negative, the reaction was exothermic. If it is positive, the reaction was endothermic. Example: CH4(g)+2O2(g)-->CO2(g)+2H2O(g) Delta H (kJ/mol) CH4(g) -74.8 O2(g) 0 CO2(g) -393.5 H2O(g) -241.82 Products: 2(-241.82)+(-393.5)= -877.14 kJ Reactants: -74.8+2(0)= -74.8 kJ Total: -877.14-(-74.8)= -802.34 kJ The reaction was exothermic.
