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There can be many cases. One of them being that you take the reactants in excess then a little portion of the reactants remain. Another is the reaction cannot take place. In reversible reactions. But you should note that the exact proportion of reaction cannot remain in a reaction cause you are trying to form new comounds during this reaction.
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∙ 9y ago
The reactants in a chemical reaction exist before the reaction begins and are consumed during the reaction. Once the reaction is complete, the reactants are typically no longer present. However, in some cases, a small amount of reactant may remain unreacted or there may be reversible reactions where some reactants can be regenerated.
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If the chemical properties of the substance have not changed has a chemical reaction occurred?
It depends: just try to relate, try to write a chemical equation for and see if there are byproducts. Most likely, if the same chemical still has its same properties After the reaction, a chemical reaction has not occurred.
What is true of a dynamic equilibrium?
When the concentration of the reactants is equal to the concentration of the products and does not change over time, the system has reached dynamic equilibrium. Dynamic equilibrium means that the reaction is still occurring and does not stop. The reaction never reaches completion, because the reverse reaction is moving at the same rate as the forward reaction. The products and reactants are balanced. The reactants are producing at the same speed that the products are changing back into the reactants. When a reaction is in dynamic equilibrium, it is hard to tell that a reaction is occurring. There is no net change in the concentration of the products or reactants because both forward and reverse reactions are moving at the same rate.
What does not change in a chemical reaction?
The mass. This is because the numbers and kinds of atoms remain the same, they are just rearranged. According to the Law of Conservation of Mass, in a chemical reaction, matter is neither created nor destroyed. Because of this the sum of the mass of the reactants will always equal the mass of the products.
True or False When a chemical reaction occurs the physical and chemical properties of the reactants are the same as the properties of the products.?
unnecessary will change physically depending on what type of reaction, sometime chemically change . For example physically change are ice to water (solid to liquid) Chemically change are HCl + NaOH = NaCl + H2O ( the content changed )
What does it mean when are reaction is spontaneous?
The reaction happens by itself.
What does it mean to say a reaction proceeds to 10 percent completion?
It means 10% of reactants have been converted into products and 90% are still there as reactants.
Which term is used to defined substance that participate in chemical reactions?
Substances that participate in the complete, finished reaction are called reactants. Substances that participate for only part of the reaction (in other words, it is used up [or canceled out in the equation]) are called intermediates. Substances that do not participate in the reaction but are still added (and speed up the reaction [their identity is not changed]) are called catalysts.
Can A reversible chemical reaction can only convert reactants to products true or false?
False!!!! A reversible reaction converts reactants to products, but when sufficient product is made spontaneously to products will reform the reactants. The reaction system reaches a point known as an 'Equilibrium', where the forward reaction ( reactants to products) rate is the as the backward reaction (products to reactants). At Equilibrium all four chemicals are present in the reaction vessel. The Classic example is Ethanol and Ethanoic Acid , forms water and Ethyl Ethanoate. The reaction equation is CH3COOH + CH3CH2OH H2O + CH3C(=O)OCH2CH3 The double ended arrow indicates a system which is reversible and at equilibrium.
If the chemical properties of the substance have not changed has a chemical reaction occurred?
It depends: just try to relate, try to write a chemical equation for and see if there are byproducts. Most likely, if the same chemical still has its same properties After the reaction, a chemical reaction has not occurred.
Is ice melting. A chemical reaction?
No, it's a physical reaction because it is still water just in a different form.
What is true of a dynamic equilibrium?
When the concentration of the reactants is equal to the concentration of the products and does not change over time, the system has reached dynamic equilibrium. Dynamic equilibrium means that the reaction is still occurring and does not stop. The reaction never reaches completion, because the reverse reaction is moving at the same rate as the forward reaction. The products and reactants are balanced. The reactants are producing at the same speed that the products are changing back into the reactants. When a reaction is in dynamic equilibrium, it is hard to tell that a reaction is occurring. There is no net change in the concentration of the products or reactants because both forward and reverse reactions are moving at the same rate.
What does not change in a chemical reaction?
The mass. This is because the numbers and kinds of atoms remain the same, they are just rearranged. According to the Law of Conservation of Mass, in a chemical reaction, matter is neither created nor destroyed. Because of this the sum of the mass of the reactants will always equal the mass of the products.
What distinguishes a chemical reaction from a physical change?
Matter that undergoes a physical change has the same chemical make up as the product. For example, when ice melts, the liquid water and ice are still water with the formula H2O. In a chemical change, matter does undergo a change, so that it is no longer the same substance that you started with. For example, magnesium plus hydrochloric acid react to produce the products magnesium chloride and hydrogen gas. So the products are completely different from the reactants.
True or False When a chemical reaction occurs the physical and chemical properties of the reactants are the same as the properties of the products.?
unnecessary will change physically depending on what type of reaction, sometime chemically change . For example physically change are ice to water (solid to liquid) Chemically change are HCl + NaOH = NaCl + H2O ( the content changed )
Is sugar dissolving in water a chemical reaction?
No, it is a physical change. A chemical reaction involves changing a molecule(s) into something else. When dissolving sugar in water, you still have sugar and you still have water.
Why does it appear there is less material after a chemical reaction?
The material still has the same amount. However, some of the matter leaves after the chemical reaction that changes the matter's molecular structure.
What does it mean when are reaction is spontaneous?
The reaction happens by itself.
