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What else can I help you with?
What is lightning a candle a physical or chemical change?
chemical
Do all chemical reactions need heat to start them?
no
Why is burning of gas considered a chemical change?
All burning reactions involve chemical reactions (chemical changes).
What are some things that need chemical energy?
Candle and all Chemical reactions
Does chemical reactions need water?
Not all chemical reactions require water. While many reactions may occur in the presence of water, there are also reactions that take place in other solvents or under dry conditions. The presence of water can often act as a catalyst or a medium for facilitating certain reactions, but it is not a universal requirement for all chemical reactions.
What are advantage of chemical change?
The biggest advantage of chemical change is life. All organisms are alive because of the sum total of all the chemical reactions occurring in their cells.
Do all chemical reactions need atomic nuclei?
All atoms involved in a chemical reaction have an atomic nucleus.
What are some things that need energy?
Candle and all Chemical reactions
What laboratory evidence do you need to show that chemical reaction has taken place?
That depends very much on what reaction is taking place. For some reactions a thermometer is all you need. For others, such as titrations, you need some sort of indicator, such as Eriochrome Black T. Other reactions may require a manner of collecting gas, still others, such a precipitation reactions, may only require your eyes.
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.
What is the role of energy in chemical reations?
All chemical reactions need a certain amount of activation energy to get started.
Why is chemical change important to people who bake?
Baking is all about Chemical Changes. The reason cake batter turns into a cake is because of chemical reactions.
