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becoz the chemical reaction is irreversible to change it.............
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∙ 12y ago
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What evidence of a chemical reaction might you see by dropping an alka seltzer in water?
its a chemical reaction becase once the alka seltzer melts you cant take it out and put it back together
When gas burns you can tell it is a chemical reaction because?
you saw a reaction you smelt something you heard something and you cant get that gas back to its original form
Why mole concept is used in balancing chemical equation?
mole concept is used in balancing chemical reaction because for balancing a reaction u cant change the numbers such as 1,2,3 etc.. in between the compund so as a whole we are changing outside the compound
How chemistry help in kitchen?
it can help you to know what are the chemical properties of substances and their reaction when mixed with other substances and what not to be put in a dish as it can give a harmful reaction. it also tells you about an acidic substance and a base and also teach you about household remedies of some diseases
Why cant you lit a match after it is already have been lit?
Because the process of producing the flame is a chemical reaction. The reaction can only exist if there are unused chemicals to fuel the change. Once all the chemicals are used up - the reaction stops.
Why cant a chemical reaction be put back the same?
cause chemical reactions cant be reversed
What is a chemical reaction is on the 5th grade level?
a chemical reaction is when you change the properties of something and you cant change it back:example>:burning paper
Chemical reaction between phenol and bromine water?
it cant decolourise
Is turning an egg into a pancake a chemical or a physical reaction?
chemical -you cant turn the pancake back into an egg :)
Is cooking any onion a chemical reaction or physical?
its a chemical reaction . u cant get back raw onions after they r cooked! can uuuuuuuuuuuuu ??????????
What evidence of a chemical reaction might you see by dropping an alka seltzer in water?
its a chemical reaction becase once the alka seltzer melts you cant take it out and put it back together
Why cant an unbalanced chemical equation fully describe a reaction?
The amounts of reactants and products are not mentioned.
What are the differences between the physical and chemical?
in changes. Physical changes can be reversed. E.g. if you were to melt a block of ice, and then freeze it again, it would to some degree be reversed. This is a physical change. However, if you were to burn a peace of toast, the change would be chemical. Once the toast is burnt you cant get it back.
Is lighting of bulb reversible or irreversible change?
Is the lighting of a bulb a reversible or an irreversible change
When gas burns you can tell it is a chemical reaction because?
you saw a reaction you smelt something you heard something and you cant get that gas back to its original form
How tyo recgonize chemical and physical change?
think if it can be reversed. if it is easially reversed, it is most likely physical. ie. if you bake a cake, you cant make it go back to a batter, so it is a chemical change. if you freeze an ice cube, you can just melt it and it goes back to water, so its a physical change.
Is baked bread a chemical change?
Yes it is because the chemical properties change and it cannot be reversed.
