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Contrast the forming and breaking of chemical bonds in terms of energy changes?
Wiki User
∙ 9y ago
The formation of chemical bonds releases energy. It is an exothermic process. The breaking of chemical bonds takes energy. It is an endothermic process.
Wiki User
∙ 9y ago
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Explain Why physical changes can be reversed but chemical changes cannot?
Physical changes are generally easy to reverse because NO ENERGY is produced by the substance.A Chemical change cannot be reversed because ENERGY is produced by the substance forming a new substance.
Which is the only subatomic particle that is directly involved in the chemical reactions between atoms?
An electron, it plays a part in forming/breaking all proper chemical bonds (there are other types of bonds but they don't really cause chemical reactions and as such are rather boring)
What type of change that produces a new substance?
If you mean changing one element into another, like uranium 238 into plutonium 239, which happens in nuclear reactors, the word is 'transmutation'. Otherwise many chemical reactions form new substances, without the elements involved changing, and these would be called 'chemical reactions'.
Do chemical bonds share atoms?
No. However, covalent bonds share electrons between two atoms. In an ionic bond, electrons are either gained or lost forming ions.
What observations suggest that a chemical reaction has occurred?
One observation that a chemical change has occurred is the formation of a new product. Another observation is the change in identity and composition of a substance.
What does not require breaking and forming chemical bonds?
physical changes, like freezing, boiling, cutting, breaking, bending
What happens to atoms during chemical changes?
Chemical changes involve breaking and forming of bonds between atoms. Chemical energy is required to break bonds. The formation of new bonds releases energy.
How is physical. change different than a chemical. change?
physical changes can be not permanent like solid-liquid-vapour chemical changes are permanent if not reversible
Definition of chemical reaction?
the process of forming new substances from reactants that involves the breaking and forming of chemical bonds.
What is the breaking and forming of chemical bonds that leads to a change in the composition of matter?
A chemical reaction.
When you add heat to a combination of substances breaking bonds and forming a new substance the process is called a?
Chemical reaction
When you add heat to a combination of substance breaking bonds and forming a new substance the process is called?
Chemical reaction
Is snow forming a physical or chemical property?
It is a physical change: water changes from gas to solid.
What does chemical reaction have to do with making and breaking bonds?
Bonds in the reactants are broken, and bonds in the product are formed.
Is it true that if a physical change that occurs when a substance changes composition by forming one or more new substances?
No. That is a chemical change. In a physical change, their is no change in chemical composition forming one or more new substances.
Explain Why physical changes can be reversed but chemical changes cannot?
Physical changes are generally easy to reverse because NO ENERGY is produced by the substance.A Chemical change cannot be reversed because ENERGY is produced by the substance forming a new substance.
When a substance changes phase is it a physical or chemical change?
I think:Temperate increasing/decreasing = ChemicalColour Change = ChemicalBubbles formed= Chemical (due to gas forming bubbles)Light produced = ChemicalETC....These are all changes after a chemical reaction.Physical changes:Ice to WaterWater to IceVapour to waterVapour to iceEtc.....
