Flame Tests for Unknowns

Students use flame tests to identify unknown metal ions.
This video is part of the Flinn Scientific Best Practices for Teaching Chemistry Video Series, a collection of over 125 hours of free professional development training for chemistry teachers - elearning.flinnsci.com
ATTENTION: This demonstration is intended for and should only be performed by certified science instructors in a safe laboratory/classroom setting.
Be sure to subscribe and check out more videos!
Subscribe: kzbin.info/door/inn...
Facebook: / flinnscientific
Website: www.flinnsci.com/

[@aditikakkad1506]

Why is that guy who's making the entries of data on the board wearing safety glasses 😂😂

[@clintonng1258]

john had 4 apples and u take one find the mass of the sun

[@clintonng1258]

Because the gravitational attraction of our Sun for the Earth is the centripetal force causing the Earth's circular motion around the Sun, we can use Netwon's law of universal gravitation to find the mass of the Sun without ever actually visiting the Sun. This is the same technique you would use to determine the mass of Cygnus X-1 with a probe. The Earth, orbiting the Sun, plays the same role as the probe sent to orbit Cygnus X-1. F(Force of Gravity) = F(Centripetal Force)Because 'm' can be eliminated from both sides of the equation, and because 'd', the distance from the Earth to the Sun is also 'r', the orbital radius of Earth around the Sun, the equation can be rearranged to solve for the mass of the Sun To actually compute the mass of the Sun, we need to know how far the Earth is from the Sun and how fast it is moving around the Sun. The value for G, the universal constant of gravitation, is 6.67 x 10-11 N m2 kg -2 (where N is Newtons). The distance separating the Earth and the Sun (the orbital radius of the Earth around the Sun), r, is 1.5 x 108 km. The Earth's velocity around the Sun is just the total distance travelled divided by the time required for the Earth to make one complete orbit around the Sun, T mass of the sun = 1.98892 × 1030 kilograms=1.98892 × 10 to the 30 power plus the mass of three apples.

[@user-ki6pt2zg1h]

Please WATCH this video examination in life never give up-kzbin.info/www/bejne/oWXaZaOXoJtpjJI

[@m00d88]

Great video tysm this helped me prepare for my lab tomorrow

[@naturfagstoff]

Hi. Nice experiment. I would rinse the wire with HCl.

[@joypalit6408]

Why?

[@hanifahmutiaradewipinangka7622]

@@joypalit6408 to make it neutral

[@spacefunc5351]

@@hanifahmutiaradewipinangka7622 no...HCl won't neutralise the wire....due to the HCl the organic salt will turn to chloride of that salt which is more volatile as compared to the organic salt....hence the colour will be more noticeable.

[@akou12]

HCI isnt normal water.

[@user-ki6pt2zg1h]

Please WATCH this video examination in life never give up-kzbin.info/www/bejne/oWXaZaOXoJtpjJI

[@healthwealthlifestyle4439]

Nice video. Thank you

[@samarooritv6601]

This is awesome thanks!

[@manorigamarathne444]

the wire should rinse with HCl

[@adilmujawar7536]

i jus luv dat apple green flame

[@shrooqelgohary1694]

Thank u.. keep doing practical videos they help cz my teachers dont teach practically

[@prasadpatil5346]

its nice & helpful video thanx,buthow much % solution to be taken?

[@yuvraj-iw2zq]

Is nichrome wire not react with CONC.HCl ???

[@Sara-L]

That's kinda funny. 'RED!' 'GREEN!' '..Lavender.' Are you sure its not Purple? Lilac? Orchid maybe? Amethyst? Gosh, we're awfully specific!

[@user-ki6pt2zg1h]

Please WATCH this video examination in life never give up-kzbin.info/www/bejne/oWXaZaOXoJtpjJI

[@basavarajunakalla6003]

What is burn with soot how it's ?

[@organicnky7448]

Subscribed you watching at the first time 💎❣💎

[@Mhamza98]

this was really enjoyable

[@wisekicksh6462]

No

[@Mhamza98]

@@wisekicksh6462 4 years ago*

[@wisekicksh6462]

Mhamza98 still no

[@jamesfx7227]

I have a quastion: to identify if some material is an organic compound, first we carry out a flame test(then we can figure out if it's aliphatic or not), next we do the test of solubility ( to know what kind of compound it is), and detection of elements present( to know, of course, the elements present), lastly the functional group identification confirms the substance. So, by doing these steps we can guess the molecular structure? (I didn't have analitical chemistry). Beforehand, thank you!

[@naturfagstoff]

Hi. That flame test is probably not like this one. Aromatic hydrocarbons give off dark smoke when they are burned, so I think what You are referring to is more like a smoke test.. But I could be wrong.

[@dgmoon28]

رائع شكرا 💗💗💗💗💗

[@Mukunda5757]

Great but Yellow and Orange colour denote water not due to sodium, Sun look Yellowish Orange due to universe space is cold

[@jtixtlan]

And what if you have to identify an unknown which emits a red flame, but two of the known nitrates also emit a red flame?

[@kiracat3441]

+Michelle Donati You wouldn't do a flame test but add sodium hydroxide instead to each solution, the different precipitates that form on top of each one would determine the nitrate used, using a precipitate colour chart.

[@squeakee2]

what gauge wire is he using?

[@WildbillTheWizard]

It's usually tiny. His was a little bigger. The ones we used were 0.7mm in diameter, the size of mechanical pencil lead.

[@pranjalkar2670]

Thank you sir i a Indian student

[@meri5731]

the procedures shown by the guy in video is not best possible or accurate enough lab procedure for the flame method of testing the elements. A+ students can improve on the procedures to have and achieve a more accurate testing results using the flame method of testing the elements

[@pavan199864]

calcium is also red so how can v find lithium and calcium remake this video

[@child9125]

Calcium isn't bright red like lithium. It's more of an orangish red. Like a sunset. You can search it up. I'm sorry I can't attach an image for you to see.

[@ameinm1216]

Nɨċɛ Vɨɖɛօ Tɦaռҡ Yօʊ ...

[@tooyolee1748]

I never heard levender colour

[@jtixtlan]

A lab was about flame tests. Students were given .5M plastic containers of 9 different nitrate solutions. A question at the end asks, "Using a chemistry textbook, find the formulas for the compounds that are 1M and used in the flame tests." What do think this question means? Am I just supposed to write the chemical formula? The formula is already on the label of each of the liquid compounds. For example, the formula for cupric nitrate would be Cu(NO3)2. Is that all this is? Maybe the teacher did not know that the formulas were written along with the name on each label?

[@naturfagstoff]

But the solutions have to be 1M. Those that were used were only 0.5M.

[@manushwetarao4782]

Nic one bro

[@meri5731]

why is it that he doesn't know or did he choose to show an bad procedures to teach and achieve flame test results?

[@aravindrajeev4594]

for some reason this reminded me of breaking bad..Walter white😢

[@yasyasmarangoz3577]

?

[@bharatvaghela406]

Jorr

[@mukeshgupta-rs8zo]

Hindi me nahi Bana sakte hai

[@DaddyJoe.]

this guy is a science teacher an yet he does not know how to rinse the wire correctly XD

[@flxb5442]

very bad

[@livedubaiinternationalreal6175]

Chemistry is the palmestery

[@prakashsolanki6776]

very bad