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No, it depends entirely on what substances are involved. Sometimes chemical formulas will show the addition of reactants and on the side of the reactants there will be "NR," meaning "no reaction".
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoA chemical reaction will not always occur when two products combine. Some general rules when dealing with single replacement and double replacement reactions are:In a single replacement reaction, a metal can replace another metal if it above the metal it is replacing in the activity series of metals.Hydrogen in acids can be replaced by a metal above hydrogen.
Hydrogen in water can be replaced by metals from sodium upwards.
In a double replacement reaction, one product must be insoluble in water.
Wiki User
∙ 12y agoNo, not in all cases. Some reactions involve more than two substances reacting. Other times a single substance breaks down into two or more. Example: hydrogen peroxide breaking down into water and oxygen.
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Why are combustion reactions considered exceptions to the rules of chemical reactions?
Combustion Reactions are always reacted with Oxygen gas in this case if you had C3H8+O2 you will ALWAYS get H2O+CO2 it does not matter if you have C100H54+O2 you will still get H2O+CO2 this is why combustion reactions are considered exceptions to the rules of a product or chemical reaction.
What is the difference between a reactant and a product in a chemical reaction?
Substances initially present in a chemical reaction that are consumed during the reaction or a substance that participates in a chemical reaction, esp a substance that is present at the start of the reaction while the end product of some chemical reactions yield products.
Why are combustion reactions considered exceptions to the rules?
Combustion reactions always include O2 (Oxygen Gas) and a hydrocarbon (hydrogen and carbon) and the products are always CO2 and H2O. So, for example, you have C200H108 + O2 then the products will still be CO2 and H2O. It is considered an exception because normally, in chemical equations, the amount of reactants have to equal the amount of products.
Does the total number of atoms stay the same during a chemical reaction?
Indeed by the Law of Conservation of Mass, mass cannot be lost or gained through a reaction. Similarly, atoms cannot be lost, gained or somehow transformed themselves-only rearranged into different compounds. This means there are still going to be the same amount of Hydrogen atoms after a reaction as there were before.
What is aqueous silver nitrate and potassium bromide combine to form a precipitate?
When a substance is aqueous, it means that it is dissolved in water. In aqueous reactions, the reaction is always a double replacement reaction, meaning one ion of a compound will switch with an ion from the other compound. A precipitate is an substance that is not soluble in water, meaning it cannot be dissolved. You can tell whether or not a substance is precipitate using a solubility chart. Therefore, using a solubility chart, we can tell that the product silver bromide will be the precipitate and the product potassium nitrate will be aqueous.
Why do chemical reactions always involve a chemical change?
Chemical bonds always break in chemical reactions, causing changes in energy.
Why are combustion reactions considered exceptions to the rules of chemical reactions?
Combustion Reactions are always reacted with Oxygen gas in this case if you had C3H8+O2 you will ALWAYS get H2O+CO2 it does not matter if you have C100H54+O2 you will still get H2O+CO2 this is why combustion reactions are considered exceptions to the rules of a product or chemical reaction.
Why do chemical reactions always involve a change in energy?
Chemical bonds always break in chemical reactions, causing changes in energy.
What happeneds to atoms in a chemical reaction?
Chemical reactions occur when different atoms and molecules combine together and spit apart. For example, if Carbon (C) is burnt in Oxygen (O2) to form Carbon Dioxide, a Chemical Reaction occurs.So, during chemical reactions, new product atoms are not created, and old reactant atoms are not destroyed. Atoms are rearranged as bonds are broken and formed. In all chemical reactions, mass is always conserved...In chemical reactions, atoms rearrenge to form products...During chemical change atoms arrange and form new bonds. The new bonds are form to make the products.
When chemical reactions occur energy is always absorbed?
No, chemical reactions can be endothermic or exothermic.
Why do reactions always involve a change in energy?
Chemical bonds always break in chemical reactions, causing changes in energy.
What changes are always involved in chemical reactions?
electrons are always involved in chemical reactions. how they are positioned which atom they are located if they are sharing paired unpaired etc.
Do Chemical reactions involve the interplay of the electrons of the reacting chemical?
always.
Do chemical reactions always involve changes in energy?
no
What is true about combustion reactions?
Carbon dioxide will be a product. APEX: These reactions are always redoxx reactions. The products will always be carbon dioxide and water.
Does physical state of matter always change during a chemical change?
No. Two elements of the same state can combine and still be in the same state in the end product.
Chemical reactions always involve changes in a chemical?
There will always be changes in one of the reactants. In some chemical reactions, one of the chemicals works as a catalyst to encourage a reaction between two or more chemicals but does not change during the reaction.
