{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

chem lab questions

chem lab questions - reaction to grow brighter and longer...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Post Lab 1. Someone may have knocked the crucible over or someone could have washed it down with cold. 2. The black matter at the bottom of the crucible will not affect the experiment because the black matter that cannot be scraped off will be a part of the crucible. Therefore, it will not affect the experiment. 3. It would be extremely bright, the magnesium would react faster with the oxygen, and magnesium may be lost in vapor. 4. The low flame does not burn the whole magnesium all the way; therefore, the mass would be much smaller. 5. My ratio of magnesium to oxygen was 1:2. % error = 1 - 0.5/ 1 x 100 = 50% error 6. Using more magnesium would make the reaction last longer and it can cause the light
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: reaction to grow brighter and longer, which would be dangerous to the eyes. 7. Stirring the contents after the initial reaction will get the rest of the magnesium that hasn’t reacted to react. Mr. Myers does this part so that we wouldn’t spill the magnesium. 8. Hydrogen comes from the air and nitrogen comes from the water. 9. The empirical formula of H2O2 is HO. 10. First, you need to find the mole of the sulfur; 1.28/32 = 0.04 moles of oxygen. Then find the grams of oxygen in compound to then use it to convert to moles of oxygen; 3.2 – 1.28 =1.92 grams of oxygen in compound. 1.92/15.9 = 0.12 moles of oxygen . Therefore, the empirical formula of the compound is SO3....
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern