Because Gold is an extremely unreactive metal, which means that it is not found in any compounds, e.g. Gold Oxide, but is only found on its own. So no chemical reaction is needed to obtain gold.
Also, if you look at a metal reactivity series, gold will be at the bottom of the list.
Turning a penny gold is a physical reaction rather than a chemical reaction. This process involves coating the penny with a layer of gold, which changes its appearance but does not alter the chemical composition of the penny itself.
Gold plating on non-metals is a physical change. There is no chemical change when a wood, glass, ceramic, marble or plastic is being plated . However, Electroplating is a chemical change because when a metal is being plated with another metal, there is a chemical reaction.
gold has no reaction in water, or acid. if there is no reaction that means no chemical reaction. the gold gets wet, or changes temperature in the water, that might be considered a physical change. gold is remarkably unreactive as far as metals go.
Activation energy is the minimum amount of energy required for a chemical reaction to occur. It acts as a barrier that reactants must overcome to form products. This energy is needed to break bonds in the reactant molecules before new bonds can form in the products.
Enzymes are catalysts, they reduce the activation energy.
A substance that lowers the energy needed to start a chemical reaction is a catalyst.
Turning a penny gold is a physical reaction rather than a chemical reaction. This process involves coating the penny with a layer of gold, which changes its appearance but does not alter the chemical composition of the penny itself.
The initial compounds in a chemical reaction are called reactants.
With magnets.
Gold plating on non-metals is a physical change. There is no chemical change when a wood, glass, ceramic, marble or plastic is being plated . However, Electroplating is a chemical change because when a metal is being plated with another metal, there is a chemical reaction.
reactants is your answer
Catalysts actually lower the activation energy needed to start a chemical reaction. This makes the reaction happen more easily.
The energy needed to start a chemical reaction is called the activation energy :)
They speed a chemical reaction. Add: Catalysts lower the activation energy needed to start a chemical reaction.
The catalyst is not a reactant in a chemical reaction but contribute to the success of this reaction.
Activation energy is the energy needed to start a chemical reaction by breaking the existing chemical bonds in the reactants before new bonds can form in the products. This energy barrier must be overcome for the reaction to proceed.
To initiate a chemical reaction an activation energy is necessary.