How Can I Verify Results for My Grade 9 Science Experiment?

Join the discussion
Registration is free. Start your own thread to ask a follow-up.
Sign up Log in
4 replies · 8K views
princevisram
Messages
2
Reaction score
0

Homework Statement



I didn't get time to finish the experiment, and didn't get much done, so my teacher told me to copy someone elses work and varify if it was correct, but i don't know how. here is the info i have:

Qualitative Analysis of Unknown Gasses

In this experiment, you will be using known properties of 3 gases in order to ultimately identify an unkown gas.

Procedure (the teacher gave us this):

1. using a clean test tube, fill the test tube approximately 1/3 full with hydrochloric acid
2. with your Bunsen burner lit and ready, place a 2 cm piece of Mg ribbon into the test tube with the acid stopper immediately
3. keep your thumb on the stopper to prevent any gas from escaping.
4. Preform the flame test to identify the gas either hydrogen or oxygen.
5. Repeat steps 1-4 using hydrogen peroxide and manganese dioxide
6. repeat steps 1-4 using zinc metal and hydroclhloric acid.


Homework Equations



given in # 1


The Attempt at a Solution



Okay. So I got that Mg in Hydrocloric acid is hydrogen because it made a poping noise. But I couldn’t figure out the others on time, (I only had a half hour) so this is what my friend got:

Unknown Gas : Magnesium
Observation: Loud pop
Hydrogen or oxygen: hydrogen

Unknown Gas: Zinc
Observation: Loud pop
Hydrogen or oxygen: Hydrogen

Unknown Gas: Magnesium + Peroxide
Observation: Splint + Glowed Bright
Hydrogen or oxygen: Oxygen.
 
Physics news on Phys.org

Discussion

Thanks, i hope what you mean is i/they did it right! :D
 
Those seem correct to me. For completeness, however, you should be able to describe why hydrogen will give you a loud pop when you perform the flame test and why oxygen causes the splint to glow.