it is an ionic and exothermic reaction i.e. when it will take place heat will be liberated
That is a physical change. The is no chemical change that takes place when you sharpen your pencil in a standard manner. I suppose if you sharpen it extremely fast, you could catch the pencil on fire, which would then be a chemical change.
NaHCO3
A log burning in a fire place.
becuz she iz cool like that:)
The screw that tightens to hold the needle in place, and loosens when you want to change the needle.
It is a physical change. The sodium hydroxide dissolves, but it is still sodium hydroxide.
Adding salt to water is not a chemical reaction, nor is it a chemical change. When salt dissolves in water, this is an example of a physical change. Although the sodium and chlorine ions separate in the water, no chemical reaction takes place.
no, the substances that you mix must interact to form a completely new substance for a chemical change to take place. Mixing sand and salt is not a chemical change. Mixing vinegar with sodium bicarbonate will lead to the release of carbon dioxide gas. This is a chemical change.
It is a chemical change because the reactants (hydrochloric acid and sodium hydroxide) are undergoing a chemical reaction to form new substances (water and salt) with different properties. The heat produced is a sign of a chemical reaction taking place.
Dissolving salt in water is an example of a physical change. Although the ions of sodium and chlorine separate when the salt dissolves, no chemical reaction takes place.
When chemical changes occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated. Eg of a chemical change is the reaction between sodium hydroxide and hydrogen chloride to produce sodium chloride, or common salt.
Dissolving salt in water is an example of a physical change. Although the ions of sodium and chlorine separate when the salt dissolves, no chemical reaction takes place.
A chemical change occurred because the reaction between hydrochloric acid and sodium hydroxide generated heat, indicating a release or absorption of energy. Even though there may not be a visible change, the temperature increase is evidence of a chemical reaction taking place.
No, it is not a chemical change. For example, if you put gold bubbles into any single acid, no chemical change will take place.
Signs that a chemical change has taken place include the formation of a gas, the formation of a precipitate, a change in temperature, and a change in color.
I assume you mean chemical "change" and the answer is no, it is a physical change that takes place.
Chemical changes take place on the molecular level