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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 are key words for chemical changes?
Key words for chemical changes include reactants, products, chemical equation, chemical reaction, bonds breaking/forming, and energy changes.
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
What type of change when a substance changes into a new substance?
chemical
Is a physical change what happens when chemical bonds break and new bonds form?
No, a physical change does not involve breaking or forming chemical bonds. It only involves changes in physical properties like size, shape, or state of matter. Chemical changes involve the breaking and forming of chemical bonds to create new substances.
What properties refer to a substance's ability to undergo changes that alter its composition and identity?
Chemical properties refer to a substance's ability to undergo changes that alter its composition and identity. These changes often involve the breaking and forming of chemical bonds within the substance.
How are physical and chemical changes distinguished?
Physical changes involve a change in appearance or state of matter without altering the composition, like melting ice. Chemical changes, on the other hand, result in the formation of new substances with different properties, such as rusting of iron. The key difference is that chemical changes involve breaking and forming of chemical bonds.
What are characteristics do all chemical changes have?
All chemical changes involve the formation of new substances with different properties. They typically involve changes in the arrangement of atoms and the breaking and forming of chemical bonds. Chemical changes are often irreversible and are accompanied by changes in energy.
Which substance can be broken down by a chemical change The answer is Hexane--but why?
Hexane is a compound. All chemical compounds can be broken down by chemical change (chemical reactions of many types) - not only hexane. All the other choices are elements which cannot be broken down by chemical changes.
If a substance explodes when it reacts with water is it a chemical or physical change?
It is a chemical change because the reaction involves the breaking and forming of chemical bonds in order to create new substances. Physical changes typically involve changes in state or appearance without altering the chemical composition of the substances involved.
What is it called when a substance changes into a different substance?
This process is called a chemical reaction. Chemical reactions involve the breaking and forming of chemical bonds, resulting in the conversion of one substance into one or more different substances with different properties.
