E Answer the following questions briefly.
1. Write the characteristics of a chemical change.
2. What are the differences between atoms and molecules?
3. The process of freezing is an example of a physical change even though water and
ice have different properties. Why?
4. How are compounds different from mixtures?
5. How does the soaking of cut pieces of vegetables and fruits in water reduce the level of
browning?
Answers
Answer:
There are five signs of a chemical change:
Color Change.
Production of an odor.
Change of Temperature.
Evolution of a gas (formation of bubbles)
Precipitate (formation of a solid)
Explanation:
this is first answer
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Answer:
Answer1)There are five signs of a chemical change:
Color Change.Production of an odor.Change of Temperature.Evolution of a gas (formation of bubbles)Precipitate (formation of a solid)
Answe2)Atoms are single neutral particles.Molecules are neutral particles made of two or more atoms bonded together. An ion is a positively or negatively charged particle
Answe3)The process of freezing is an exampleof physical change even though theproperties of ice and water isdifferent. This is because duringphysical change the substance doesn't make another substance.
Answer4)Compound: A substance that is made up of more than one type of atom bonded together.
Mixture: A combination of two or more elements or compounds which have not reacted to bond together; each part in themixture retains its own properties.
Answer5)The cut cells release some enzymes that react with oxygen in air and cause oxidation and result in browning of the cells. ... When, the cut fruits andvegetables are soaked in water, these enzymes cannot react with air, thusdoes not cause oxidation and as a result browning is prevented