Kamis, 14 Juni 2012

HAPPY BIRTHDAY ADEEEELLL \:D/

Huehehe hai blogggyy, aku ga akan berkata "udah lama nih ga ngepost" atau bla bla yang biasanya orang" lakukan :D well, kita ketemu lagi yaa bloggy ku :3 apa kabar kamu? maaf ya aku cuma ngisi kamu dengan soal2 yang ribet(loh kok jd ngomong sm blog nya sih?) sudah lupakan -__________-
then, tanggal 04 juni kemarin aku ulang tahun!!! beberapa hari sebelum ultah aku sempet lupa-_-karena udah di cekcokin sama persiapan final test. untunglah ada ibu yang ngingetin, thanks mom! :).
di tanggal 04 juni aku bangun jam 04.30 agak lebih awal dari biasanya karena berhubung juga aku mau lanjut belajar untuk ulangan geo._. hehe pas bangun liat hape, ade sms dr my mom dan ndin.. dan ternyata ibu saya ngucapin di jam 12 :') dan beliau adalah orang pertama, dan ndin adalah org yang kedua hehe.. thank you mom dan ndin yang kebetulan juga lagi ulang tahun saat itu :) cek twitah udah banyak yang mention, ngucapin selamat ulangtahun dan doa2, di facebook juga hihihi... tapi berbeda banget dengan keadaan d kamar, sepi krik krik banget -__- anak2 kamar pd sibuk dengan belajar nya(aku tau sih mereka itu pura2 ga tau) :p dan saat itu juga cincin aku ilang!!!! cincin pemberian orang tua yang harus d pake,lalu tiba2 gak ada? :( emg sih kalo mau wudhu aku selalu buka tuh cincin, nah cincinnya aku taro di atas buku, dan kebetulan juga saat aku mandi risa lagi nyapu -___- dengan keadaan BT maksimal aku ke sekolah berjuang untuk ujian hari ini.... well, ujian terakhir di hari pertama adalah ujian sosiology, 5 menit sebelum bubar. pipin ngacungin tangan nya.
pipin: "miss,may i write something in the whiteboard?"
miss yasmine: *mengangguk*
pipin menggoreskan tulisan "HAPPY BIRTHDAY ADEEEL, WISH YOU ALL THE BEST" anak2 X-4 menoleh ke arah ku, dan pipin pun berkata lagi : "ayo kita nyanyi buat adel.." miss yasmine: "eh nanti dulu msh 4 menit." pipin pun balik lagi ke meja nya,miss yasmine mengambil lembar jawaban ujian kami.. sesampai nya di meja ku, "yang ulang tahun jangan cemberut gtu dong muka nya.." aku terdiam, dan kemudian tersenyum.  setelah itu terdengr lah lantunan lagu selamat ulangtahuuun :) aaa terharuuu mamaaaaaa :') thank you so much pipin, thank you X-4...
balik ke dorm, si kiki teriak2 ngucapin selamat ulang tahun, dan beberapa anak yang ngucapin happy birthday :3 seneng deh...
balik ke kamboja 10 dengan gembira nya. kemudia nelpon ibuu..
me: td malam ga tdur ya?
mom: iya nunggu jam 12.
aa terharu kaaan :")
mukhsin dan fauziah mengajak ku menyelesaikan project physics, aku beralasan kepada mereka, "solat dulu ya..." aku pun solat ashar di kamar rere,karena kalo ada aar chika dan risa aku ga bisa solat, letwa mulu deh-__-, di tengah2 solat fauziah ke kamar ku dan menyuruh ku untuk cepat2 ke balkon, tapi aku mengabaikan nya karena sedang menghadap Tuhan Yang Maha Esa ddan chika pun mengatakan "adel td udah keluar.." well, aku pamit samakamboja 10 dan langsung ke balkon. di balkon sudah terlihat papau dan ucin sibuk mengejrakan project, saat aku datang, mereka kaget,melempari ku dengan sandal, dan aaaa semacam perang, 
"adeeeelllllllllllllllllllllllllllll,.." mereka pun bernyanyi happy birthday dengan riang nya. memberi ku kue ulang tahun yang terbuat dari sale pisang yang mereka hiasi dengan lilin :3 aku meniup lilin itu dan d photo deh sama mukhsin.
papao: adeel,kan jadi ga surepriseeee.
adel: loh emg knp?
papao: tadi tuh kita udah siap2 in, jadi tadinya mukson sembunyi d balik itu. pas aku manggil kamu, kita mau bikin surprise. eh nyatanya kamu malah liat kue nya duluan/
alhasil, aku papao dan mukhsin ngakak di balkon :D sore itu bahagia banget, project physics beres, dan ulang tahun ku pun d rayakan dengan riang nya :3
nyampe d kamar, anak2 kamboja 10 lagi pada males2an -__-
tiba2 risa nyeletuk: adel ultah ya hari ini?
me: tauk ah
lalu merekaa bernyanyi dengan nama yang salah, yaitu.. "happy birthday adiill.." berulang2 dan tanpa dosa -__- oke abaikan. setelah itu aku dapat sms dr daddy dus, kalo dove house dinner bareng :)
saat setelah solat maghrib, aku langsung ke atas untuk dinner, lalu saat ngambil makan,earthquake terjadi!!!! kami di kumpulkan, dan d kasi pengarahan, setelah itu aku berkumpul bersama doveee :') lagi2,mereka ngucapin selamat ulang tahuun, 21 anak,dove,my family :) aku d peluk sama dovey, di ucapin ulang tahun dan sebagainya, ah seneng nya :3 makasih mamiii, makasih dadii, makasih dove house, love deeeeeh <3 dan aku melanjuutkan belajar untuk ujian besok :) jam setengah 9 aku balik ke kamar, dan 20 menit kemudian, kamar sepi banget -__- cuma aku sendiri, anak kamboja10 manaaaaa? dan ternyata mereka lg kumpul d kamar sebelah, dan tiba2 pintu kamar di gedor2 ga jelas, kaca jendela juga! pas d liat gada orang. -__- dan aku juga udah tau pelakunya, jupleeeeeeee dan niza lucu-_-
haha! aku lanjut belajar biology di kasur, tiba2 ada yang manggil.....
"adel.. sini kamu.." ada miss LISA!!!!
aku pun nurut dan duduk di sebelah miss lisa, dan lalu tiba2 miss lisa menyalami ku dan bilang "selamat ulang tahun" dengan senyuman nya yang cantiikk banget :') thank you house advisor kuu :') heheh
di depan kamar udah gerasak gerusuk, miss lisa: "i dont what will they do.." aku ga ambil pusing dan lanjut belajar lagi, setelah itu... dan tiba2 dengan pekikan suara yang... ehem... terdengar suara...
"HAPPY BIRTHDAY ADEEEEEEEL...." berulang2 dengan nada suara pelan dan tiba2 nyaring haha :D ada juple, arum, dan temen sekamar (aar, chika, risa) what a great moment :') lagi dan lagi aku niup liliin hehe
juple meluk aku dan mengucapkan ulang tahun, niza, arum jugaaa :3 dan kamboja 10 jugaaa(aar,chika, risa) i love you deeeeeh :3hehehe setela itu kami makan tuh keripik yang d sulap jadi kue ulang tahun, kemudian mereka memberika beberapa kertas berisi ucapan ulang tahun :) lalu chika memberi ku sebuah kertas yang udah d gulung2 banyak banget.
chika: "ini buat kamu .." aku membuka nya, dan ternyata CINCIN pemirsa!!!! mereka yang ngumpetin,aaaaaaa :') indah nyaa bersama orang2 yang menyayngi kitaaa :)
dan pesta di tanggal 04 juni pun selesai.. soal waipee07 ga ngucapin, aku ga masalah, toh emg aku kan biasanya panitia ulang tahun nya -__- haha :D
hari jum'at 08 juni..
saat lagi liat announcement board..
berta: "del nanti wai pee 07 makan bareng!"
ya ya ya ya, aku udah tau sih mereka mau ngapain..
daaaan yeah, anak2 wai pee 07 udah ngumpul di dinning room. dan seperti biasaaaa, lagu itu terdengar meriah lagi :3 awww seneng deeeh hehehe
mereka berkata "maaf ya deel, kita sengaja kook..." ha aku senyum2 sendiri, cengar cengir..
dan mereka memberiku gulungan kertas yng udah d kasi pita warna biru dan pink, unyu deh..
"buka deh, kamu pasti bakal kaget.."
well, aku membuka gulungan itu, dan ternyata taraaaaaaaa
ada tulisan:
TO: ADEL
HAPPY BIRTHDAY ADEL
(mah)
dan di samping2 nya ada ucapan dr anak2 waipee07.
adel: hah? kalian dapat ini dr mana?
dan setelah ocha jelasin dia minta itu pas tanggal 04, dan dia nulis di kertas itu.... dan aku kaget, takutnya dia tambah GR-___- secara orang yang bener2 aku benci lalu di pertemukan pas liburan menulis happy birthday d kertas HVS, not bad siih, tapi ya sudahlah, makasih yaaaa :)
dan well, THANK YOU SO MUCH GUYS, THANKYOU FOR YOUR ATTENTION, THANK YOU UNTUK TEMEN DUNIA MAYA DAN DUNIA REAL, THANKS BANGET FOR MY LOVELY PARENT :) wity\hout you all, my 16 is nothing.. HAPPY BIRTHDAY ADEEEL:)

Jumat, 08 Juni 2012

chemistry mid tes


1.    Substance X was electrolysed in an electrolytic cell. A coloured gas was formed at the anode and a metal was formed at the cathode.


What is substance X?

A.      aqueous sodium chloride                                             C. molten zinc oxide

B.      molten lead bromide                                                     D. solid sodium chloride



2.    The diagram shows the electrolysis of concentrated aqueous sodium chloride.


What is the colour of the Universal Indicator at each electrode after five minutes?


Colour at anode (+ electrode)
Colour at cathode ( - electrode)
A
Blue / purple
Red
B
Red
Blue/purple
C
Red
Colourless
D
Colourless
Blue / purple











3.    Which diagram shows an experiment in which the bulb lights?


4.    Copper and hydrogen can each be formed by electrolysis.At which electrodes are these elements formed?


Copper
Hydrogen
A
Anode
Anode
B
Anode
Cathode
C
Cathode
Anode
D
Cathode
Cathode



5.    The electrolysis of concentrated aqueous sodium chloride makes three products.Which products are shown at the correct electrodes?


Anode (+ve)
Cathode (-ve)
A
Chlorine
Sodium hydroxide
B
Sodium hydroxide
Chlorine
C
Hydrogen
Sodium
D
Sodium
Hydrogen



6.    Which equation shows an oxidation reaction?

A.      C + O2CO2                                                      C. 2H2O22H2O + O2

B.      CaCO3CaO + CO2                                         D. N2O4 2NO2



7.    Carbon dioxide is an acidic oxide that reacts with aqueous calcium hydroxide.Which type of reaction takes place?

A.      Decomposition                 B. fermentation                                C. neutralisation                               D. oxidation



8.    Which is not a typical property of an acid?

A.   They react with alkalis producing water.

B.   They react with all metals producing hydrogen.

C.   They react with carbonates producing carbon dioxide.

D.   They turn litmus paper red.



9.    A solution contains barium ions and silver ions.

What could the anion be?

A.      chloride only                                                      C. nitrate only                   

B.      sulfate only                                                        D. chloride or nitrate or sulfate



10.Which process is endothermic?

A.      adding water to anhydrous copper(II) sulphate

B.      burning magnesium to make the oxide

C.      heating water to make steam

D.      neutralising acidic industrial waste



11.      When ammonium nitrate is added to water, an endothermic reaction occurs and?

A.     the surroundings get hotter                      C. heat is given out

B.     the temperature rises                                 D. the temperature falls

12.   Which diagrams show a process in which an exothermic change is taking place?


A.  1 and 2 only                                                        C. 1 and 3 only                  

B.  2 and 3 only                                                        D 1, 2 and 3



13.   In different experiments, 2 g of marble are added to 10 cm3 of hydrochloric acid.In which tube is the reaction fastest?


14.      For the reaction: 3H2 + N2à 2NH3
The breaking of bonds in a hydrogen molecule when it combines with nitrogen to formammonia must be?

A.     Endothermic                                                    C.   electrolytic

B.     Electrostatic                                                     D.  exothermic

15.      The reaction between hydrogen and chlorine to form hydrogen chloride can be written as:
H2(g) + Cl2(g)
à2HCl(g)
Use the bond energies shown to calculate the energy change that takes place when hydrogen chloride is formed according to the above equation. (Bond energies in kJ/mol: H-H 435, Cl-Cl 245, H-Cl 430)

A.     90 kJ given out                                                                C. 250 kJ taken in

B.     180 kJ given out                                              D. 125 kJ taken in



16.      When an exothermic reaction takes place, the reaction mixture gets hotter because?

A.     energy is always released in a chemical change which makes new substances

B.     more energy is absorbed when new bonds are made than is needed to break existing bonds

C.     in an exothermic change the products are more stable than the reactants

D.     exothermic changes always produce gases

17.      Calcium carbonate in the form of limestone dissolves in hydrochloric acid and giving off carbon dioxide gas. Which conditions would produce the fastest reaction?

A.     temperature of 40°C and 10cm3 of dilute acid

B.     temperature of 40°C and 5cm3 of dilute acid and 5cm3 of water

C.     temperature of 20°C and 10cm3 of dilute acid

D.     temperature of 20°C and 5cm3 of dilute acid and 5cm3 of water

18.      Which mixture will produce the slowest reaction to take place between solid calcium carbonate (marble chips) and dilute hydrochloric acid?

A.     large chips, concentrated acid, low temperature

B.     low temperature, largel chips, dilute acid

C.     concentrated acid, high temperature, small chips

D.     high temperature, small chips, dilute acid

19.      Acids react with bases, carbonates and metals.Which of these reactions produce a gas?


Reaction of acid with
Base
Carbonate
Metal
A
B
X
X
C
X
D
X
X



20.   The diagram shows the position of an element X in the Periodic Table.


What is the correct classification of element X and its oxide?


X
Oxide of X
A
Metal
Acidic
B
Metal
Basic
C
Non-metal
Acidic
D
Non-metal
Basic



B.Give a clear and complete answer for each number below! The total score for this part is 50

21.      The diagram shows the apparatus used by a student to find the concentration of  hydrochloric acid. Sodium hydroxide solution was added to hydrochloric acid until the solution was neutral.


(a) Complete the boxes to name the apparatus used. [3]

(b) How could the student tell when the solution was neutral?

...........................................................................................................................................

..................................................................................................................................... [2]

[Total: 5]

22.      The apparatus below was used to deposit a thin layer of chromium on a steel knife.

The knife was cleaned carefully and all grease removed before the process started.


(a) What is the name of the process when metal objects are coated with other metals?

..................................................................................................................................... [1]

(b) (i) Suggest the identity of metal A.

......................................................................................................................................[1]

(ii) Suggest the name of salt B.

.............................................................................................................................. …….[1]

(c) Give two reasons why steel knives are coated with chromium.

1. ..................................................................................................................................

2. ................................................................................................................................. [2]

[Total: 5]

23.   The electrolysis of concentrated aqueous sodium chloride, between inert electrodes, is used

to make three important chemicals.  (Total : 8)

hydrogen

chlorine

sodium hydroxide



 (a) The ions present in the electrolyte are Na+, H+, C and OH.

(i) Hydrogen ions are discharged at the negative electrode (cathode).

Write an equation for this reaction.

.............................................................................................................................. [2]

(ii) The hydrogen ions are from the water.

H2O à H+ + OH

Suggest an explanation why the concentration of hydroxide ions increases.

....................................................................................................................................

.............................................................................................................................. [2]

(iii) When a dilute solution of sodium chloride is used, chlorine is not formed at the

positive electrode (anode), a different gas is produced. Name this gas.

.............................................................................................................................. [1]

(iv) State an example of an inert electrode.

.............................................................................................................................. [1]

(b) (i) State a use of hydrogen.

.............................................................................................................................. [1]

(ii) Why is chlorine used to treat the water supply?

.............................................................................................................................. [1]

24.Soluble salts can be made using a base and an acid.

(a) Complete this method of preparing dry crystals of the soluble salt cobalt(II) chloride-6-water from the insoluble base cobalt(II) carbonate.

Step 1       

Add an excess of cobalt(II) carbonate to hot dilute hydrochloric acid.

Step 2

...........................................................................................................................................

...........................................................................................................................................

Step 3

...........................................................................................................................................

...........................................................................................................................................

Step 4

...........................................................................................................................................

............................................................................................................................. [Total 4]

25. A student used the apparatus shown below to investigate the speed of reaction when large

lumps of zinc reacted with excess sulfuric acid.

zinc + sulfuric acid zinc sulfate + hydrogen




(a) As the reaction proceeds, describe what happens to

(i) the mass of the zinc lumps.

.............................................................................................................................. [1]

(ii) the concentration of zinc sulfate in the solution in the fl ask.

.............................................................................................................................. [1]

(b) The student’s results are shown below.


(ii) Use your graph to calculate the volume of hydrogen given off after 25 minutes.

volume of hydrogen ............................................................................................. [1]

(iii) Explain why no more hydrogen was given off after 50 minutes.

.......................................................................................................................................[1]

(iv) Describe a test for hydrogen.

test .............................................................................................................................

result .................................................................................................................... [2]



(c) What happens to the speed of the reaction when

(i) smaller pieces of zinc are used?

.............................................................................................................................. [1]

(ii) some water is added to the sulfuric acid?

.............................................................................................................................. [1]

(d) The reaction between zinc and sulfuric acid is catalysed by copper(II) sulfate solution.

What do you understand by the term catalyst ?

..................................................................................................................................... [1]

[Total: 12]

26.  A student investigated the addition of four different solids, A, B, C and D, to water.

Five experiments were carried out.

Experiment 1

By using a measuring cylinder, 30 cm3 of distilled water was poured into a polystyrene cup

and the initial temperature of the water was measured. 4 g of solid A was added to the cup

and the mixture stirred with a thermometer. The temperature of the solution was measured after 2 minutes.


Experiment 2

Experiment 1 was repeated using 4 g of solid B.


Experiment 3

Experiment 1 was repeated using 4 g of solid C.


Experiment 4

Experiment 1 was repeated using 4 g of solid D.


Experiment 5

A little of the solution from Experiment 4 was added to a little of the solution from

Experiment 2 in a test-tube. The observations were recorded.

Observations A fast reaction. Vigorous effervescence and bubbles produced.

(a) Use the thermometer diagrams for Experiments 1-4 to record the initial and final temperatures in Table 4.1. Calculate and record the temperature difference in Table 4.1.


(b) Draw a labelled bar chart of the results to Experiments 1, 2, 3 and 4 on the grid below.


Use the results and observations from Experiments 1-5 to answer the following questions.

(c) (i) Which solid dissolves in water to produce an exothermic reaction? [1]

           ……………………………………………..

(ii) Give a reason why you chose this solid. [1]

            …………………………………………………

(d) Which Experiment produced the largest temperature change? [1]

       …………………………………………………….

(e) Predict the temperature change that would happen if

(i) 8 g of solid B were used in Experiment 2, [1]

     ……………………………………………………………………………………………………………………………………

(ii) 60 cm3 of water was used in Experiment 4. [1]

     ………………………………………………………………………………………………………………………………………

(iii) Explain your answer to (e)(ii). [1]

      …………………………………………………………………………………………………………………………………..

(f) Suggest an explanation for the observations in Experiment 5. [2]    
      ……………………………………………………………………………………