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9/27/2012 9:07:08 PM
34
Is grass growing a physical or chemical change?
T4R. Discuss if grass growing is a physical or chemical change.
Go.
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[quote][b]Posted by:[/b] Snake Plissken I assume you're doing this for homework? I was always taught that chemical changes are reversible; physical changes are not. So I'd go with physical. But that's just high school chemistry. [/quote]Hey, I reverse it all the time with my lawnmower.
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Same as us.
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Chemical change [i]is[/i] physical...
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Chemical.
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Physical, it can always be cut right back down to size.
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chemical essentially, but its not really a good thing for either.
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Both. The grass grows through cell production, which involves both chemical and physical changes. The grass changes in appearance by growing taller(physical) while chemical reactions occur involving the usage of energy and producing oxygen and carbon from CO2, a chemical change. I win. [Edited on 09.27.2012 2:32 PM PDT]
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[quote][b]Posted by:[/b] Toxifies Discuss whether or not you think this is OP's homework.[/quote]
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Is the grass just stretching or is it physically building itself? It's obviously building unto itself. That is physical.
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[quote][b]Posted by:[/b] GrandmasterNinja Definatly Chemical. The process of growth isn't a mere physical change. Physical change refers to state of matter, like if the water evaporated or the metal melted.[/quote] It involves both. [Edited on 09.27.2012 1:53 PM PDT]
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Definatly Chemical. The process of growth isn't a mere physical change. Physical change refers to state of matter, like if the water evaporated or the metal melted.
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Earth Science and Astronomy are my favorite science subjects. I was so mad when I learned they don't offer those courses in the high schools here.
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[quote][b]Posted by:[/b] A 3 Legged Goat [quote][b]Posted by:[/b] Technoxious [quote][b]Posted by:[/b] A 3 Legged Goat Wow this is like 7th grade stuff. I'd say chemical since the grass growing cannot go back into a seed after photosynthesis has taken place. It's a seed before it grows, and chemical reactions within its cells have to take place for that to happen. A good rule of thumb is to remember that physical changes can be reversed, like melting an ice cube or cooling gases. However, a chemical change cannot, like boiling an egg or burning paper. [quote][b]Posted by:[/b] Swagoth Ur It's chemical. Physical change refers to changes in the state of matter, not alteriation of the structure.[/quote] Also, this. [/quote] Chemical changes can be reversed. That simple rule introduced in highschool chemistry is more of a basic guideline and less of a rule. Reversibility depends on the thermodynamic nature of the reaction.[/quote] I only briefly touched on chemistry post high school, but you are correct. There are some changes that can depending on how the state was changed. I had assumed OP hadn't reached that stage yet seeing as how his homework question seems to be at an earlier level of the subject. [/quote] Well, I go to a school that is supposed to help you make up credits you didn't get, so they have to compact classes into brief, not-so-in-depth lessons that change after about two days. That, and it's only a principals of Science class. Before going there, I took Physical Science, Earth Science, and Biology at my other school.
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[quote][b]Posted by:[/b] Technoxious [quote][b]Posted by:[/b] A 3 Legged Goat Wow this is like 7th grade stuff. I'd say chemical since the grass growing cannot go back into a seed after photosynthesis has taken place. It's a seed before it grows, and chemical reactions within its cells have to take place for that to happen. A good rule of thumb is to remember that physical changes can be reversed, like melting an ice cube or cooling gases. However, a chemical change cannot, like boiling an egg or burning paper. [quote][b]Posted by:[/b] Swagoth Ur It's chemical. Physical change refers to changes in the state of matter, not alteriation of the structure.[/quote] Also, this. [/quote] Chemical changes can be reversed. That simple rule introduced in highschool chemistry is more of a basic guideline and less of a rule. Reversibility depends on the thermodynamic nature of the reaction.[/quote] I only briefly touched on chemistry post high school, but you are correct. There are some changes that can depending on how the state was changed. I had assumed OP hadn't reached that stage yet seeing as how his homework question seems to be at an earlier level of the subject.
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[quote][b]Posted by:[/b] Rampant Tragedy [quote][b]Posted by:[/b] Technoxious Anyway, grass going is a complex biological process, involving cells dividing and growing, and proteins interacting, and all that jazz. It isn't simple enough to just be designated as either a chemical or physical change.[/quote]It's not about simplicity. The entire biological process occurs due to chemical reactions in the plant cells, thus making it a chemical change.[/quote] There are also "physical change" processes going on as well...phase changes of liquids and proteins, physical changes in lipid mobility at times, changing of concentration gradients. These are all things that can be said to be "physical changes", but imo, the two categories are kind of dumb/useless anyway.
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What does the reading from your text your teacher assigned tell you?
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[quote][b]Posted by:[/b] Technoxious Anyway, grass going is a complex biological process, involving cells dividing and growing, and proteins interacting, and all that jazz. It isn't simple enough to just be designated as either a chemical or physical change.[/quote]It's not about simplicity. The entire biological process occurs due to chemical reactions in the plant cells, thus making it a chemical change.
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[quote][b]Posted by:[/b] A 3 Legged Goat Wow this is like 7th grade stuff. I'd say chemical since the grass growing cannot go back into a seed after photosynthesis has taken place. It's a seed before it grows, and chemical reactions within its cells have to take place for that to happen. A good rule of thumb is to remember that physical changes can be reversed, like melting an ice cube or cooling gases. However, a chemical change cannot, like boiling an egg or burning paper. [quote][b]Posted by:[/b] Swagoth Ur It's chemical. Physical change refers to changes in the state of matter, not alteriation of the structure.[/quote] Also, this. [/quote] Chemical changes can be reversed. That simple rule introduced in highschool chemistry is more of a basic guideline and less of a rule. Reversibility depends on the thermodynamic nature of the reaction.
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[quote][b]Posted by:[/b] Snake Plissken See the edit, lol. I feel like an unbelievable tool considering I actually got an A in chemistry. [/quote] I was always top of the class in science, but even I had to glance over a brief explanation for this since it's been so long.
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Anyway, grass going is a complex biological process, involving cells dividing and growing, and proteins interacting, and all that jazz. It isn't simple enough to just be designated as either a chemical or physical change.
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[quote][b]Posted by:[/b] Technoxious [quote][b]Posted by:[/b] Snake Plissken [quote][b]Posted by:[/b] pwnage79 [quote][b]Posted by:[/b] Snake Plissken I assume you're doing this for homework? I was always taught that chemical changes are reversible; physical changes are not. So I'd go with physical. But that's just high school chemistry. [/quote] Pretty sure that might be the other way around. Or maybe just wrong. Salt disolved into water is a physical change. Evaporate the water, you then have the water and salt separated.[/quote] But is it a change? What has actually [i]changed[/i]? Think about the change of bread to toast. That's certainly not a chemical change, and irreversible. [/quote] Toasting bread is a chemical change...you're oxidizing parts of the bread using heat and O2. It's probably a lot more complex than that anyway, but w/e, it definitely involves chemical change.[/quote] See the edit, lol. I feel like an unbelievable tool considering I actually got an A in chemistry.
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[quote][b]Posted by:[/b] Snake Plissken [quote][b]Posted by:[/b] pwnage79 [quote][b]Posted by:[/b] Snake Plissken I assume you're doing this for homework? I was always taught that chemical changes are reversible; physical changes are not. So I'd go with physical. But that's just high school chemistry. [/quote] Pretty sure that might be the other way around. Or maybe just wrong. Salt disolved into water is a physical change. Evaporate the water, you then have the water and salt separated.[/quote] But is it a change? What has actually [i]changed[/i]? Think about the change of bread to toast. That's certainly not a chemical change, and irreversible. [/quote] Toasting bread is a chemical change...you're oxidizing parts of the bread using heat and O2. It's probably a lot more complex than that anyway, but w/e, it definitely involves chemical change.
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[quote][b]Posted by:[/b] pwnage79 [quote][b]Posted by:[/b] Snake Plissken I assume you're doing this for homework? I was always taught that chemical changes are reversible; physical changes are not. So I'd go with physical. But that's just high school chemistry. [/quote] Pretty sure that might be the other way around. Or maybe just wrong. Salt disolved into water is a physical change. Evaporate the water, you then have the water and salt separated.[/quote] But is it a change? What has actually [i]changed[/i]? Edit: Derped, you're right. So long since those days of yore. [Edited on 09.27.2012 1:17 PM PDT]
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It's chemical. Physical change refers to changes in the state of matter, not alteriation of the composistion. [Edited on 09.27.2012 1:16 PM PDT]
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After quickly reviewing the elementary concepts of physical versus chemical changes, the grass growing would be considered a chemical change. I say this simply because growth requires chemical energy; therefore, it is the product of chemical reactions.
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[quote][b]Posted by:[/b] Snake Plissken I assume you're doing this for homework? I was always taught that chemical changes are reversible; physical changes are not. So I'd go with physical. But that's just high school chemistry. [/quote] Pretty sure that might be the other way around. Or maybe just wrong. Salt disolved into water is a physical change. Evaporate the water, you then have the water and salt separated.
