Determining States of Matter in Reactions

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Katelyn Li 2J
Posts: 27
Joined: Wed Sep 21, 2016 3:00 pm

Determining States of Matter in Reactions

Postby Katelyn Li 2J » Tue Oct 11, 2016 4:54 pm

When asked to write a balanced equation, are we required to specify the states of matter? For example, question 7 of the Fall 2015 quiz prep says to write a balanced equation for the combustion of CH3OH. I understand how to do the actual problem, but how can you tell what state of matter CH3OH is? Is there a rule or is it just something we need to know for any potential substances we might be asked about?

I'm also confused because in the answer section, the states of matter are written for answer 2 but not 7.

Minu Reddy
Posts: 31
Joined: Sat Jul 09, 2016 3:00 am

Re: Determining States of Matter in Reactions

Postby Minu Reddy » Tue Oct 11, 2016 11:20 pm

I spoke to some TA's regarding the same questions about listing the states of matter, and they said that for the purposes of this quiz, you should mainly focus on the balancing part of the equation. But I don't think that it hurts if you list the states of matter if you know them!

Michael_Zhang_1J
Posts: 21
Joined: Wed Sep 21, 2016 3:00 pm

Re: Determining States of Matter in Reactions

Postby Michael_Zhang_1J » Tue Oct 11, 2016 11:50 pm

Additionally, if you know the state of matter of a catalyst, are you supposed to list it?

Maya_McNealis1B
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Joined: Wed Sep 21, 2016 2:59 pm

Re: Determining States of Matter in Reactions

Postby Maya_McNealis1B » Sat Oct 29, 2016 6:30 pm

I know we were told that we didn't need to know how to determine the state of matter for the quizzes, but the Fall 2012 Midterm has questions that ask us to balance an equation and write the states of matter of all the compounds. Are we expected to know this, and if so where can I find out how to do this?

peytonruiz 1H
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Joined: Fri Sep 29, 2017 7:03 am
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Re: Determining States of Matter in Reactions

Postby peytonruiz 1H » Thu Oct 05, 2017 3:28 pm

FOR CHEM 14A 2017 FALL:
do we need to write the states of matter in writing a chemical reaction?
furthermore, how does one decipher state of matter?
thanks

Taylor 1F
Posts: 17
Joined: Thu Jul 27, 2017 3:00 am

Re: Determining States of Matter in Reactions

Postby Taylor 1F » Fri Oct 06, 2017 4:50 pm

Is an aqueous solution still considered a liquid?

Rachel Formaker 1E
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Re: Determining States of Matter in Reactions

Postby Rachel Formaker 1E » Fri Oct 06, 2017 6:03 pm

For the purposes of chemical equations, aqueous solutions and liquids are different, and it is important to make this distinction when writing out the equation.
An aqueous solution is indicated by the symbol (aq), while a liquid is indicated by the symbol (l).

Yuting Zhu 3D
Posts: 17
Joined: Tue Oct 10, 2017 7:14 am

Re: Determining States of Matter in Reactions

Postby Yuting Zhu 3D » Sun Oct 15, 2017 2:54 pm

When an element or compound is in it's aqueous state, it means that it is dissolved in a solvent, and became a solution.
However, when an element or compound has to reach its boiling point in order to be in its liquid state.
So there is a huge difference here.


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