10 experimente pentru copii

8/17/2019 10 experimente pentru copii

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1. Experiment: balonul rezistent la foc

Scris de Gabriela CostacheLuni, 08 August 0!! !":#!

$aloanele sunt fragile% &rebuie 'inute departe de obiecte ascu'ite (i de flac)r)% *lac)ra tope(te materialul dicare este f)cut balonul (i acesta se sparge% Experimentul de fa') +a ar)ta cum un balon poate fi ţinut lângă flacără şi totuşi va rămâne intact.

De ce aveţi nevoie

:: baloane rotunde, neumflate:: c-te+a chibrituri:: ap)%

Cum decurge experimentul

.mfla'i unul din baloane (i lega'i/l str-ns% n cel)lalt balon turna'i un sfert de can) de ap), apoi umfla'i/l (i peacesta (i lega'i/l%

Aprinde'i un chibrit (i apropia'i/l de primul balon% L)sa'i flac)ra s) ating) balonul% Acesta se +a sparge, probabchiar 1nainte ca flac)ra s)/l fi atins%

Aprinde'i alt chibrit pe care 1l +e'i 'ine sub cel de/al doilea balon% L)sa'i flac)ra s)/l ating)% Ce se 1nt-mpl)2$alonul nu se sparge% 3e'i putea +edea chiar o pat) 1nchis) de culoare de la ardere, dar acesta +a r)m-ne intact%

Explicaţia experimentului

4eretele primului balon, sub ac'iunea fl)c)rii, +a de+eni foarte fierbinte, se +a 1nmuia (i nu +a rezista presiuniiaerului din interior%

n cazul balonului cu ap), aceasta +a absorbi cea mai mare parte a c)ldurii, iar peretele balonului nu +a mai fisupus topirii% 5ac) men'inem flac)ra destul timp ca apa s) se 1nc)lzeasc), atunci (i peretele balonului se +acomporta ca 1n cazul primului balon%

Apa este un foarte bun absorbant de c)ldur)% Este ne+oie de o mare cantitate de c)ldur) pentru a schimbatemperatura apei% Spre exemplu, este ne+oie de zece ori mai mult) c)ldur) pentru a ridica temperatura unui gramde ap) cu un grad, dec-t 1n cazul fierului% 5e asemenea, c-nd apa se r)ce(te, dega6) o foarte mare cantitate dec)ldur) acesta este moti+ul pentru care regiunile din apropierea marilor 1ntinderi de ap) 1n sezonul rece suntmai calde dec-t restul%

ATENŢIE: Aveţi grijă cum lucraţi cu ci!riturile" ca #i cu !aloanele care $e $parg

http://www.scientia.ro/stiinta-la-minut/124-experimente-acasa/2205-experiment-acasa-balonul-rezistent-la-foc.htmlhttp://www.scientia.ro/stiinta-la-minut/124-experimente-acasa/2205-experiment-acasa-balonul-rezistent-la-foc.html


2/12


3/12

.mple'i crati'a cu ap) rece% 4une'i o lingur) de ap) 1n cutia de b)utur) r)coritoare, golit) 1n prealabil% nc)lzi'icutia pe o plit) p-n) c-nd apa fierbe% La acest moment +e'i +edea cum +aporii de ap) ies prin deschiz)tura cutie*olosind cle(tele de buc)t)rie, apuca'i cutia, o 1ntoarce'i rapid (i o scufunda'i 1n crati'a cu ap) rece% 3a colapsaaproape instantaneu%

Explicaţia experimentului:

3aporii forma'i de apa care fierbe +or 1nlocui aerul din cutia de r)coritoare% Scufundat) 1n ap) rece, ace(ti +apose +or r)ci brusc, se +or condensa, (i astfel +or crea un +id par'ial% 4resiunea foarte sc)zut) din)untru permite presiunii aerului din afar) s) 1ndoaie cutia%

Cutia de r)coritoare colapseaz) c-nd presiunea din afara ei este mai mare dec-t presiunea din interior, iardiferen'a este mai mare dec-t cea la care materialul poate rezista%

A&E@7

"% linguri de otet

% linguri de bicarbonat

#% *oaie de hartie sau palnie =optional>%

&rocedura

!% &oarna cele linguri de otet in sticla


4/12

% Cu a6utorul unui cornet de hartie sau unei palnii toarna cele doua linguri de bicarbonat in balon

"% 4une balonul pe gura sticlei

% 4ri+este cum se umfla balonul

5. Telefon (cu r) din pahare de plastic

&rincipii: Sunetul calatoreste prin aer si prin obiecte%

%ateriale:

doua pahare de plasticfir lung de ata

doua scobitori


5/12

Di$cutii de$pre:

sunet

Experiment $tiinti'ic:*aceti o mica gaurai in centru in partea de 6os a fiecarui pahar din plastic%


6/12

&his Fors a lot lie our bending Fater experiment% Jhen ou rub the balloon through our hair, in+isibleelectrons =Fith a negati+e charge> build up on the surface of the balloon% &his is called static electricit, Fhichmeans Mnon/mo+ing electricitM &he electrons ha+e the poFer to pull +er light ob6ects =Fith a positi+e charge>toFard them / lie the soda can%

7.

• ! balloon =round ones Fill For, but the longer MairshipM balloons For best>

• ! long piece of ite string =about !0/!# feet long>

• ! plastic straF

• tape

!% &ie one end of the string to a chair, door nob, or other support%

% 4ut the other end of the string through the straF%

"% 4ull the string tight and tie it to another support in the room%

% $loF up the balloon =but donKt tie it%> 4inch the end of the balloon and tape the balloon to the straF asshoFn abo+e% NouKre read for launch%

#% Let go and Fatch the rocet fl?

http://www.sciencebob.com/experiments/bendwater.phphttp://www.sciencebob.com/experiments/bendwater.php


7/12

So hoF does it For2


8/12

t eeps our super hooper from turning off course% Some ha+e ased Fh the plane does not turn o+er since the hoo


9/12

9. Color Changing Milk Experiment

http://www.youtube.com/watch?!"#$C%&%'(a)

&his experiment is perfect for earl childhood chemistr lessons on chemical bonds% Children ages to ! areengaged and excited about coloring mil% &he Fill learn about color mixing and bipolar characteristics%

• Experiment *roce+ure

• ,ow 'oe) -t ork?

• ++itional -n0ormation

• Cu)tomer 1eiew)

Experiment Materials:

• Milk 2whole or 3

•

'inner plate

• 6oo+ coloring 2re+7 yellow7 green7 blue

• 'i)h%wa)hing )oap 2'awn bran+ work) well

• Cotton )wab)

% 8ee more at: http://www.)tee)pangler)cience.com/lab/experiment)/milk%color%

explo)ion)tha)h.g'ep9;.+pu0

Experiment rocedure

%

http://www.youtube.com/watch?v=6T3C-0-Djashttp://www.stevespanglerscience.com/lab/experiments/milk-color-explosion#experiment-procedurehttp://www.stevespanglerscience.com/lab/experiments/milk-color-explosion#how-does-it-workhttp://www.stevespanglerscience.com/lab/experiments/milk-color-explosion#additional-informationhttp://www.stevespanglerscience.com/lab/experiments/milk-color-explosion#reviewshttp://www.youtube.com/watch?v=6T3C-0-Djashttp://www.stevespanglerscience.com/lab/experiments/milk-color-explosion#experiment-procedurehttp://www.stevespanglerscience.com/lab/experiments/milk-color-explosion#how-does-it-workhttp://www.stevespanglerscience.com/lab/experiments/milk-color-explosion#additional-informationhttp://www.stevespanglerscience.com/lab/experiments/milk-color-explosion#reviews


10/12

&he secret of the bursting colors is the chemistr of that tin drop of soap% 5ish soap, because of its bipolarcharacteristics =nonpolar on one end and polar on the other>, Feaens the chemical bonds that hold the proteinsand fats in solution% &he soapKs polar, or hydrophilic =Fater/lo+ing>, end dissol+es in Fater, and its hydrophobic=Fater/fearing> end attaches to a fat globule in the mil% &his is Fhen the fun begins%

&he molecules of fat bend, roll, tFist, and contort in all directions as the soap molecules race around to 6oin upFith the fat molecules% 5uring all of this fat molecule gmnastics, the food coloring molecules are bumped and

sho+ed e+erFhere, pro+iding an eas Fa to obser+e all the in+isible acti+it% As the soap becomes e+enlmixed Fith the mil, the action sloFs doFn and e+entuall stops%

&r adding another drop of soap to see if thereKs an more mo+ement%


11/12

@ow li0t out your other bottle an+ wipe i0 care0ully with a towel. ie it a )harp tap on the table

an+ watch a) it rapi+ly turn) into ice.

D/

#hing) you>ll nee+:

• #wo < litre bottle) o0 water 2+eioni)e+ water 0or car batterie) work) be)t7 but you coul+ u)e

Fltere+ water

• thermometer 2optional

• clear mixing bowl

• #wo bucket)

• kg o0 ice cube)

• $kg o0 table )alt

• #owel

!o" to do it:

Te experiment can $ometime$ 'ail i' a !ottle i$ )noc)ed !* accident. +ou can increa$e *our cance$ o'

$ucce$$ !* putting t,o !ottle$ o' deioni$ed ,ater in eac !uc)et.

1.

Continue rea+ing the main )tory

hy +oe)n>t the water 0reeGe at &C?

http://www.bbc.co.uk/science/0/23065582#story_continues_2http://www.bbc.co.uk/science/0/23065582#story_continues_2


12/12

Jater tends to freeze at 0C but there needs to be a KnucleusK around Fhich the crstalline structure of ice can forSo filtered Fater can be chilled Fell beloF this as there are no impurities for ice crstals to form around, unlienormal Fater%

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