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aquadest addit ion 2.
M ixing of w eak acid and st rong base makes neut ral salt . 3.
Weak acid w ill be up w hen it is react ed t o st rong base 4.
M ixt ure of sodium hydroxide solut ion and acet ic acid on t he same concent rat ion w ill makes neut ral salt
Chemist ry of Solut ion 1.
Acid-base indicat or change solut ion pH 2.
Buff er solut ion is a solut ion t hat has pH = 7 neut ral Dramat ic Show
1. Carbon dioxide gases neut ralize phenolpht alein so sodium
hydroxide solut ion becomes colourless. 2.
The for mula of sodium bicarbonat e is NaHCO
3
3. Chloride acid Asam klorida dit ambah indikat or met il orange
menghasilkan gas karbon dioksida 4.
The react ion bet w een chloride acid solut ion and sodium bicarbonat e causes pr ecipit at ion
M agic Balloon
Elect romagnet ic f orce makes paper pieces at t ract ed t o balloon
Elect ron t ransfer f rom hair int o balloon makes balloon has posit ive charges
At om consist s of negat ive and posit ive ions Smoke Ring
Cold w at er is light er t han hot w at er Float ing Ball
Wat er and oil cannot mix up because t hey are non polar
Wat er and oil cannot mix up because t her e ar e no bonding elect ron pairs
M agic M oney
Wat er cannot be burnt out because it does not cont ain O
2
M et hanol can be burnt out because it cont ains O
2
Wat er and m et hanol can be mixed up easily because t hey have same concent rat ion
Wood Ice
Endot hermic react ion can be signalled from heat emit t ed f rom syst em t o it s surround
All react ion t hat produce gas is exot hermic r eact ion
1. Student understanding of concept profile explored with structured clock reaction demonstration
On at t r act ing st udent at t ent ion t o t he new concept , som et ime t eacher s use single demonst r at ion only. Teacher gives some com ment or explanat ion, t hen, t o enforce concept t o underst and. It cannot
w ork on assessm ent , because a demonst rat ion can be view ed from diff erent w ays and w e do not give st udent s explanat ion. St udent can t hi nk different concept w e m ean, and it w ill make t hem conf use w hen
t hey face t he quest ion w e serve. M ay be, t hey can answ er w hat t hey t hink, but it w ill give us a w ide range concept t o analyze.
To get our focus, w e done t he demonst rat ion as assessm ent in st r uct ur ed manner. That m eans t hat w e had a st ruct ured answ er sheet t o hel p st udent focus w hat t hey need t o answ er t he quest ion t o
com e and a set of demonst rat ion cont ain observat ion and main demonst rat ion. W e did demonst rat ions on t he observat ion st age t o help st udent get t he dat a t hey need. W e had st udent t o w rit e cert ain dat a on
t he answ er sheet . It does not mean t hey cannot t ake ot her dat a, t hey st ill have a chance t o t ake a not e as demonst r at ion goes on.
The demonst rat ion of Chemist ry of Respirat ion is aimed t o ident ify st udent s underst andi ng of indi cat or pH range concept . On t he observat ion st age, st udent had t o observe t he colour of indicat ors
differences on acid, base, and neut ral condit ion and w rit e dow n t he dat a on t heir answ er sheet . On t he
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main demonst rat ion, t hey have t o make a predict ion about w hat w ill happen if w e blow a base sodi um hydroxide solut ion w it h indicat or added. It looks like so simple t o be underst ood, but t he result show s t hat
t here are 14.29 of st udent on SM and 85.71 of st udent s on UM level. Chemist ry of solut ion w as used t o explore st udent under st anding of buff er solut ion concept .
St udent w as faced t o t he colour changes of indicat or in aquadest on aci d and base addit ion. Then, t hey asked t o predict w hat w ill happen t o t he colour of indicat or in buffer solut ion w hen acid and base solut ion
is added. The r esult show ed t hat t her e are 11.76 of st udent on SM and 70.59 on UM level. M agic Glass Demonst r at ion is aimed t o explore st udent underst anding of acid base neut ralizat ion
r eact ion. On observat ion st age st udent had t o observe phenolpht halein colour on base, neut ral, and aci d solut ion. Then, t hey t old t hat t here w ere a solut ion cont ains sodium hydroxide and indicat or in one glass
and acet ic acid solut ion on t he ot her glass. The acid had concent rat ion higher t hen base. St udent had t o predict t he colour change w hen t he solut ion cont ains sodium hydroxide and indicat or is added t o acet ic
acid on t he sam e volume. The result show ed t hat st udent underst anding of t his concept is more variet ies. There are 21.05 of st udent on SM , 68.42 on UM , 7.89 on PU, and 2.63 on SU.
Dramat ic show w as aimed t o explor e st udent underst anding of acid and base concept . St udent f aced t he r eact ion bet w een hydrochloride acid and sodi um bicarbonat e solut ion on observat ion st age.
They asked t o observe t he colour changes of indicat or on t his react ion. Then, on t he main demonst rat ion, t hey had t o pr edict w hat w ill happen w hen carbon dioxide gas flow n i nt o t he sodium hydroxide solut ion.
The result show s t hat num ber of st udent had misconcept ion on t his concept is highest , nam ely 83.33 of st udent .
M agic balloon explores st udent underst anding of at omic st ruct ur e concept , especially on elect ron t ransfer. St udent observe t he int eract ion bet w een balloon t hat inhibit ed on hair w it h paper. Aft er t hat ,
st udent predict ed w hat happen if t he balloon int eract ion w it h coin money and lit t le st ick f or t oot h i n t he plast ic bot t le.
Almost all st udent get w rong pr edict ion. Ther e are 77.78 st udent s t hat keep t heir preconcept ion t hat magnet ism is t he only f orce t o make at t ract ion happened. M eanw hile, t here ar e 19.44 st udent s able
t o use right concept t o make explanat ion aft er t hey know t he r esult of t he demonst rat ion. The rest of t hem cannot give t he cl ear answ er, evenly aft er t hey know t he result of t he end demonst rat ion.
Smoke ring demonst rat ion explor e st udent underst andi ng of molecule mot ion concept . On t he observat ion st age t hey observe hot red w at er spr ead out quickly int o cold w at er. Then, st udent have t o
predict w hat w ill be happened w hen green cold w at er is dropped int o col d w at er . We hoped t hat st udent can com par e t he spread rat e bet w een red hot w at er and green col d w at er . M ore t han 50 of st udent s
seem t o get diff icult y on t he concept of t his demonst rat ion. Almost of t hem predict t hat col d w at er w ill f loat on hot w at er. They failed t o underst and t hat cold w at er is heavier t han hot w at er. It show s t hat t hey
mixed up cold w at er and ice propert ies. Float ing ball demonst rat ion explore st udent underst anding of chemical bonding concept ,
especially on polar and non polar bonding. On t he main demonst rat ion st udent have t o make t w o
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predict ions. First , st udent s have t o pr edict w hat w ill be happened w hen gr een w at er is dropped int o a glass cont ains w at er and f ried oil. Then t hey have t o predict w hat w ill be happened w hen t he green w at er ball is
pushed int o t he w at er layer. In fact , t his demonst rat ion comes fr om st udent daily lif e but t hey st ill do not know w hat t he concept s inside. There are only 5.88 of st udent s w ho underst and t his concept .
M agic money demonst rat ion gives magic sensat ion. First , st udent faces t o t he differences bet w een w at er and m et hanol propert ies w hen t hey are burnt . Then t hey have t o predict w hat w ill be
happened w hen a money paper soaked int o w at er-m et hanol mixt ure is bur nt . Almost all st udent s t ake a w rong predict ion and explanat ion and t here is only 29.41 of st udent s can change t heir concept aft er t he
demonst r at ion up. The last demonst rat ion is w ood ice. This demonst rat ion explore st udent underst anding of
t hermochemist ry concept . St udent faced a common demonst rat ion on t hermochemist ry concept . BaOH
2
.8H
2
O and NH
4
SCN pow der w as mixed up. They had know n before t hat t his react ion w ill give a drast ically t emperat ur e decr ease. This demonst rat ion is modif ied, w e put t he beaker glass on t he w et
w ood plat e before w e mix t he pow der. M any st udent get misconcept ions, even t here are 17.64 of st udent s w as classified int o no underst andi ng level.
This f oundi ng is int erest ing, because it seems t hat t hey had learnt all of t he concept s on t he classroom. This condit ion show s t hat t here are st ill so many misconcept ion experienced by st udent . They
cannot apply t heir concept t o a ‘real’ w orld like demonst rat ion. We used t o say t hat our st udent had underst ood because t hey can do t he final exam or get a good mar k. We cannot imagine t hat our st udent
make a w rong const ruct ion about chemist ry.
2. Terms of Student M isconceptions Explored w ith SCRD
