December 05, 2020, 03:33:23 AM
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High School Chemistry Forum / Re: I have a question(Simple, but it's confusing me)
« Last post by AndyewR1 on December 02, 2020, 01:26:09 PM »
266 g of oxygen is a correct answer.

It is not about "multiplying/dividing that by that", but about following the stoichiometry in a systematic way. This can be done in several ways - either using ratios or factor label method. Which one were you taught?

I was taught to do it using dimensional analysis, but I don't understand how that concept can be applied here.

Thanks for the help everybody.
72
High School Chemistry Forum / Re: I have a question(Simple, but it's confusing me)
« Last post by AndyewR1 on December 02, 2020, 01:12:51 PM »
266 g of oxygen is a correct answer.

It is not about "multiplying/dividing that by that", but about following the stoichiometry in a systematic way. This can be done in several ways - either using ratios or factor label method. Which one were you taught?

I was taught to do it using dimensional analysis, but I don't understand how that concept can be applied here.
73
High School Chemistry Forum / Re: I have a question(Simple, but it's confusing me)
« Last post by Borek on December 02, 2020, 01:11:33 PM »
266 g of oxygen is a correct answer.

It is not about "multiplying/dividing that by that", but about following the stoichiometry in a systematic way. This can be done in several ways - either using ratios or factor label method. Which one were you taught?
74
Undergraduate General Chemistry Forum / Re: Is iron(III) oxide ionic or covalent?
« Last post by Borek on December 02, 2020, 01:04:58 PM »
Well that's the whole idea of asking the question... so that I will no longer think of it in the way that "won't get [me] anywhere", and then I might actually get somewhere!

Not if you ignore answers given
76
High School Chemistry Forum / Re: I have a question(Simple, but it's confusing me)
« Last post by AndyewR1 on December 02, 2020, 01:03:04 PM »
I found a way to do this problem, but I don't think it's the "correct" way. I wrote the equation, 2H2 + O2= 2H20. I then gathered that one mol O2 is 32 grams and 2 mols H2O is 36 grams. Using this knowledge, I divided 36 into 300 and got 8.33333...  . I then multiplied 8.333333 by 32 to get 266.66666 grams of Oxygen that would be necessary to make 300 grams of water. There must be a more methodical method to go about solving this problem, right?
77
High School Chemistry Forum / I have a question(Simple, but it's confusing me)
« Last post by AndyewR1 on December 02, 2020, 12:50:56 PM »
I received this problem recently on a homework assignment, but despite working at it for quite some time I can't seem to solve it. The problem reads: "Hydrogen and Oxygen combine to form water. How many grams of Oxygen are needed to make 300 grams of water?" That is the all the information that is given to me. I would much appreciate if someone could help me out. Thanks!
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Thinking like that won't get you anywhere.
Well that's the whole idea of asking the question... so that I will no longer think of it in the way that "won't get [me] anywhere", and then I might actually get somewhere!

So the ionic bonds, although stronger, are outnumbered. Great
79
Chemical Engineering Forum / Re: reaction for precipitating polyvinyl alcohol
« Last post by biofm on December 02, 2020, 12:01:29 PM »
Is your target a slime or a rigid gel? Sodium sulfate affords a rigid gel and aluminum sulfate affords a slime. I have an article on this share. Will send you a private message.
80
Chemical Engineering Forum / Re: Furniture Resins
« Last post by biofm on December 02, 2020, 11:50:06 AM »
Have you though about epoxies.
Also, you hemp raw material material may need some surface functionalization to facilitate strong bonding. I think you can use some ionic liquids to that.
Interesting, game-changing, & sustainable idea indeed!
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