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Sabtu, 07 November 2020

MAPEL ENGLISH LM BAB 5 RECOUNT TEXT

 

I went to Yogyakarta last holiday.

RECOUNT TEXT

OBJECTIVES

  • Learners are able to understand the use of recount text.
  • Learners are able to understand the content of a recount text

LEARN ABOUT IT

A recount text is a text that contains several chronological events explained by the writer. The events might be the writer’s personal experiences happening in his/ her life. The aim of a recount text is to tell the readers/listeners about particular chronological events.
Now pay attention to the following example of a recount text. Pay attention to how the writer tells the story chronologically.

I went to Yogyakarta last holiday. I went there with my best friends: Gian, Lili, and Fitra. There were four of us. Before we went there, we had booked our hotel for four days and three nights. We went there by train because it was cheaper and we would not get stuck in traffic.
So, our first day of adventure began and we decided to start exploring Yogyakarta from one of its most popular tourist spot: Keraton Yogyakarta. We went to keraton by pedicab. Our next destination is the museum. We went to several museums in Yogyakarta. From one museum to another, we took the bus “transjogja”. We only need to pay Rp. 3500,- for the bus. The bus was comfortable with air conditioner inside.
The second day, we went to Borobudur temple. It was quite far from the city, but it was worth the trip because you would see the wonderful view of Borobudur. Next, we went to Prambanan temple and saw the art performance in Prambanan at night.
The third day we went to Parangtritis beach. We played there until noon and we walked around Malioborostreet at night.
On the last day, we went around the city to find any local restaurant that sold local foods. Finally, we were heading home at night.
That was the most amazing experience that I have ever had with my bestfriends because that was the first time we went together for holiday. I would love to do it again someday.

In the text above, you can see that the first paragraph tells you about who was involved in the story (the author and her three friends: Gian, Lili, and Fitra), when and where the event happened (last holiday, they went to Yogyakarta). It gives you the overview of the events. This part is called orientation.

*The next paragraphs (paragraph two to paragraph five) tell you about the description of the events in chronological order from the first day until the last day. *Those paragraphs tell you more about the events. You can find where the author went or what s/he did during the events. These paragraphs are called the events.

The last paragraph tells you about the author’s statement of the event (it was the most amazing experience for her and she would love to do it again). It is also a closing statement of the text. This part is called re-orientation.

If we take a look at the text above, we will know that recount text in general consists of three parts:
  1. Orientation: This part is the opening part that gives the reader overview of the setting, the time, and/or the participants.
  2. Event(s): In this part, the author tells the reader the sequence of events that happened in the past. This part describes the series of events in detail and in chronological order.
  3. Re-orientation: This part is optional. You can include re-orientation in your text or not. If you want to include this part, you need to understand that this part is more like a closing paragraph. This part is about personal statement of the author related to the story.

Example of Recount text
A.     Vacation to London
Mr. Richard’s family was on vacation. They are Mr. and Mrs. Richard with two sons. They went to London. They saw their travel agent and booked their tickets. They went to the British Embassy to get visas to enter Britain. They had booked fourteen days tour. This includes travel and accommodation. They also included tours around London
They boarded a large Boeing flight. The flight was nearly fourteen hours. On the plane the cabin crews were very friendly. They gave them news paper and magazine to read. They gave them food and drink. There was a film for their entertainment. They had a very pleasant flight. They slept part of the way.
On arrival at Heathrow Airport, they had to go to Customs and Immigration. The officers were pleasant. They checked the document carefully but their manners were very polite. Mr. Richard and his family collected their bags and went to London Welcome Desk. They arranged the transfer to a hotel.
The hotel was a well-known four-star hotel. The room had perfect view of the park. The room had its own bathroom and toilet. Instead of keys for the room, they inserted a key-card to open the door. On the third floor, there was a restaurant serving Asian and European food. They had variety of food.
The two week in London went by fast. At the end of the 14-day, they were quite tired but they felt very happy.
B.      Between Recount and Narrative
Something which happened in the past is the main resource to compose both recount and narrative text. In writer's point of view, the thing is an experience. It can be what the writer has done, hear, read, and felt. Composing recount and narrative is retelling the experiences of the past event to be a present event.
What does recount differ from narrative?
The easiest way to catch the difference is analyzing the generic structure. Recount text presents the past experiences in order of time or place; what happened on Sunday, then on Monday, the on Tuesday. In simple way, recount describes series of events in detail. It does not expose the struggle on how to make them happen. The event happened smoothly. On the other hand, narrative introduces crises and how to solve them. Narrative text always appear as a hard potrait of participant's past experience. It reveals the conflict among the participants. Cinderella's conflicts with her step mother and sister are the example. The conflict is the most important element in a narrative text. Narrative without comflicts is not narrative any more.
C.      Visiting Bali
There were so many places to see in Bali that my friend decided to join the tours to see as much as possible. My friend stayed in Kuta on arrival. He spent the first three days swimming and surfing on Kuta beach. He visited some tour agents and selected two tours. The first one was to Singaraja, the second was to Ubud.
On the day of the tour, he was ready. My friend and his group drove on through mountains. Singaraja is a city of about 90 thousands people. It is a busy but quiet town. The street are lined with trees and there are many old Dutch houses. Then they returned very late in the evening to Kuta.
The second tour to Ubud was a very different tour. It was not to see the scenery but to see the art and the craft of the island. The first stop was at Batubulan, a center of stone sculpture. There my friend watched young boys were carving away at big blocks of stone. The next stop was Celuk, a center for silversmiths and goldensmiths. After that he stopped a little while for lunch at Sukawati and on to mass. Mass is a tourist center
My friend ten-day-stay ended very quickly beside his two tour, all his day was spent on the beach. He went sailing or surfboarding every day. He was quiet satisfied.
D.     My Horrible Experience
Let me remind you my experience during an earthquake last week. When the earthquake happened, I was on my car. I was driving home from my vocation to Bali.
Suddenly my car lunched to one side, to the left. I thought I got flat tire. I did not know that it was an earthquake. I knew it was an earthquake when I saw some telephone and electricity poles falling down to the ground, like matchsticks.
Then I saw a lot of rocks tumbling across the road. I was trapped by the rock. Even I could not move my car at all. There were rocks everywhere. There was nothing I could do but left the car and walked along way to my house, in the town.
When I reached my town, I was so surprised that there was almost nothing left. The earthquake made a lot of damage to my town. Although nothing was left, I thanked God that nobody was seriously injured.

KEYPOINTS

WHAT IS RECOUNT?

1.      Definition of Recount
Recount is a text which retells events or experiences in the past. Its purpose is either to inform or to entertain the audience. There is no complication among the participants and that differentiates from narrative
2.      Generic Structure of Recount
1. Orientation: Introducing the participants, place and time
2. Events: Describing series of event that happened in the past
3. Reorientation: It is optional. Stating personal comment of the writer to the story
3.      Language Feature of Recount
• Introducing personal participant; I, my group, etc
• Using chronological connection; then, first, etc
• Using linking verb; was, were, saw, heard, etc
• Using action verb; look, go, change, etc
• Using simple past tense

Selasa, 03 November 2020

MAPEL IPA KONFIGURASI ELEKTRON

 

Konfigurasi Elektron

Konfigurasi elektron adalah susunan penyebaran (pengisian) elektron-elektron dalam. Seperti yang telah dibahas dalam bab Struktur Atom, di dalam atom terdapat partikel subatomik neutron dan proton yang terdapat pada inti atom, dan elektron yang bergerak mengelilingi inti atom tersebut pada kulit-kulit elektron (level-level energi) yang tertentu.

Lintasan peredaran elektron ini disebut juga kulit elektron. Kulit pertama yang terdekat dengan inti atom disebut kulit K, kemudian kulit kedua disebut kulit L, kulit ketiga disebut kulit M, dan seterusnya berurut berdasarkan alfabet sebagaimana kulit menjauhi inti atom. Kulit elektron ini juga dapat dinyatakan dengan bilangan kuantum utama (n), dimulai dari 1 untuk kulit K, 2 untuk kulit L, dan seterusnya.

Semakin besar nilai n, semakin jauh kulit elektron dari inti atom dan semakin besar energi elektron yang beredar di kulit terkait. Elektron-elektron akan mengisi kulit-kulit elektron pada atom dimulai dari kulit K yang merupakan level energi terendah. Setiap kulit elektron hanya dapat terisi sejumlah tertentu elektron. Jumlah maksimum elektron yang dapat terisi pada kulit elektron ke-n adalah 2n2. Namun, jumlah maksimum elektron pada kulit terluar dari suatu atom adalah 8.

Lebih jelasnya, perhatikan ilustrasi pada Gambar 1 dan Tabel 1.

gambar konfigurasi elektron
Gambar 1. Ilustrasi konfigurasi elektron atom Li, B, O, Ne, Na, dan K berdasarkan kulit elektron
(Sumber: Spencer, James N., Bodner, George M., & Rickard, Lyman H. 2011. Chemistry: Structure and Dynamics (5th edition). New Jersey: John Wiley & Sons, Inc.)


konfigurasi beberapa unsur

Untuk atom unsur golongan transisi, konfigurasi elektron nya tidak dapat ditentukan dengan metode penentuan berdasarkan kulit elektron untuk atom unsur golongan utama seperti di atas. Penentuan konfigurasi elektron atom unsur golongan transisi didasarkan pada orbital atom. Setiap orbital dalam atom akan ditandai dengan satu set nilai bilangan kuantum utama (n), bilangan kuantum azimuth (l), dan bilangan kuantum magnetik (m) yang khusus. Lalu, setiap orbital maksimum terisi 2 elektron, yang masing-masing memiliki bilangan kuantum spin (s) tersendiri. Keempat bilangan kuantum tersebut digunakan untuk men-‘deskripsi’-kan energi elektron, sebagaimana seperti ‘alamat’ elektron dalam sebuah atom untuk menemukan keberadaan elektron dalam atom tersebut.

Bilangan kuantum utama (n) mendeskripsikan ukuran dan tingkat energi orbital. Nilai n yang diperbolehkan adalah bilangan bulat positif.
Bilangan kuantum azimuth (l) mendeskripsikan bentuk orbital. Nilai l yang diperbolehkan adalah bilangan bulat dari 0 hingga n−1.
Bilangan kuantum magnetik (m) mendeskripsikan orientasi orbital. Nilai m yang diperbolehkan adalah bilangan bulat dari −l hingga +l.
Bilangan kuantum spin (s) mendeskripsikan arah spin elektron dalam orbital. Nilai s yang diperbolehkan adalah +½ atau−½.

bilangan kuantum elektron

Aturan penentuan konfigurasi elektron berdasarkan orbital:

1. Asas Aufbau: Elektron menempati orbital-orbital dimulai dari tingkat energi yang terendah, dimulai dari 1s, 2s, 2p, dan seterusnya seperti urutan subkulit yang terlihat pada Gambar 2.
aturan penulisan aufbau

Gambar 2. Urutan tingkat energi subkulit
(Sumber: Spencer, James N., Bodner, George M., & Rickard, Lyman H. 2011. Chemistry: Structure and Dynamics (5th edition). New Jersey: John Wiley & Sons, Inc.)

2. Asas larangan Pauli: Tidak ada dua elektron dalam satu atom yang memiliki keempat bilangan kuantum yang sama. Setiap orbital maksimum diisi oleh 2 elektron yang memiliki spin yang berlawanan.

3. Kaidah Hund: Jika ada orbital dengan tingkat energi yang sama, konfigurasi elektron dengan energi terendah adalah dengan jumlah elektron tak berpasangan dengan spin paralel yang paling banyak.

kaidah hund bentuk orbital

Gambar 3. Diagram orbital dan konfigurasi elektron berdasarkan orbital dari 10 unsur pertama
(Sumber: Gilbert, Thomas N.et al. 2012. Chemistry: The Science in Context (3rd edition). New York: W. W. Norton & Company, Inc.)

Contoh Soal Konfigurasi Elektron

Tentukan konfigurasi elektron dan jumlah elektron dalam setiap kulit elektron atom unsur berikut.

a. Ni (Z = 28)                                                   b. Sr(Z = 38)

Jawab:

  1. Ni (Z = 28) : 1s2 2s2 2p6 3s2 3p6 4s2 3d8 atau [Ar] 4s2 3d8; K = 2 ; L = 8 ; M = 16 ; N = 2
  2. Sr (Z = 38) : 1s2 2s2 2p6 3s2 3p6 4s2 3d104p6 5s2atau [Kr] 5s2; K = 2 ; L = 8 ; M = 18 ; N = 8 ; O = 2

Berdasarkan eksperimen, terdapat anomali konfigurasi elektron dari aturan-aturan di atas. Subkulit d memiliki tendensi untuk terisi setengah penuh atau terisi penuh. Contohnya, Cr (Z = 24) : [Ar] 4s1 3d5 lebih stabil dibanding [Ar] 4s2 3d4 ; dan juga Cu (Z = 29) : [Ar] 4s1 3d10 lebih stabil dibanding [Ar] 4s2 3d9.

Untuk ion monoatomik (seperti Na+, K+, Ca2+, S2-, Br) dapat ditentukan dari konfigurasi elektron atom netralnya terlebih dahulu. Pada kation (ion bermuatan positif) monoatomik Ax+ yang bermuatan x+, sebanyak x elektron dilepas (dikurangi) dari kulit elektron terluar atom netral A. Pada anion (ion bermuatan negatif) monoatomik By yang bermuatan y-, sebanyak y elektron ditangkap (ditambahkan) pada orbital level energi terendah yang masih belum penuh oleh elektron.


Senin, 02 November 2020

SOAL DAN PEMBAHASAN GERAK PARABOLA

 

Contoh Soal Gerak Parabola Lengkap Dengan Pembahasannya

Contoh Soal 1

Harun menendang bola dengan sudut elevasi 45o. Jatuhnya bola memiliki jarak horizontal 5 meter. Akibat percepatan dari gravitasi adalah 10 m / s2, jadi bola memiliki kecepatan awal ialah …

A. 5 m
B. 5√3 m
C. 50√2 m
D. 5√2 m

Pembahasan nya :

Jawabannya : D

Contoh Soal 2

Faris melempar bola basket dengan kecepatan 20 m/s dan sudut elevasi 30o. Waktu yang dibutuhkan bola basket untuk sampai dititik tertinggi adalah… (g = 10 m/s).

A. 1 sekon
B. 4 sekon
C. 5 sekon
D. 6 sekon

Pembahasannya :

Jawabannya : A

Contoh Soal 3

Seorang murid menendang bola dengan kecepatan awal dalam arah vertikal 9 m / s dan kecepatan awal dalam arah horizontal 12 m / s. Tentukan kecepatan awal bola.

A. 15 m / s
B. 14 m / s
C. 17 m / s
D. 23 m / s
D. 16 m / s

Pembahasannya :

Jawabannya : A

Contoh Soal 4

A. 2,8 M
B. 2,4 M
C. 2,5 M
D. 2,7 M
E. 2,3 M

Pembahasannya :

Contoh Soal 5

A. 0,36
B. 0,45
C. 0,67
D. 0,23
E. 0,47

Pembahasannya :

Jika diketahui : vo = 5 m/s;  θ = 37o
hmax = (vo2 sin2 θ)/ 2g
⇒ hmax = (52 sin2 37o)/ 2(10)
⇒ hmax = {25 (9/25)}/ 20
⇒ hmax = 9/20
⇒ hmax = 0,45 m

Jawabannya : A

Contoh Soal 6

A. x = 36 m, y = 64 m
B.  x = 64 m, y = 43 m
C.  x = 36 m, y = 43 m
D.  x = 32 m, y = 32 m
E.  x = 43 m, y = 36 m

Pembahasannya :

Jawabannya: E

Contoh Soal 7

Pembahasannya :

Jawabannya: B

Contoh Soal 8

A. 500 m
B. 000 m
C. 500 m
D. 750 m
E. 1000 m

Penjelasannya:

Jawabannya: E

Contoh Soal 9

Jawabannya: B

Contoh Soal 10

A. 10
B. 30
C. 45
D. 60
E. 75

Pembahasannya:

Jika diketahui:
vo = 1,4 x 103 m/s
Xmaks = 2 x 105 m
α = …….

Jawabannya : C

Contoh Soal 11

Contoh Soal 12

Sebuah benda dijatuhkan dari pesawat yang telah melakukan perjalanan horizontal dengan kecepatan 720 km / jam pada ketinggian 490 m. Seberapa jauh objek dari tempat pertama kali menjatuhkan objek (g = 9,8 ms-2)

A. 2500 m
B. 3000m
C. 1500m
D. 2000m

Pembahasannya:

Jika diketahui : 
Vo = 720 km/jam
=  720.000m/3600 s
=  200 ms-1
h = 490 m
g = 9,8 ms-2

Ditanya  :  S = …?

Maka:
Untuk menemukan jarak (S), pertama-tama kita mencari waktu yang diperlukan untuk benda jatuh ke tanah. Benda itu adalah benda yang jatuh bebas, mengapa? Karena kecepatan pesawat adalah 200 ms-1 horizontal, sedangkan arah vertikal (turun) kecepatannya nol (Voy = 0).

Jawabannya: D

Contoh Soal 13

Kapan kecepatan benda terkecil dan terbesar dalam gerakan parabola?

A. Titik terjauh dan titik datar

B. Titik tertinggi dan terjauh
C. Titik tertinggi dan titik panduan
D. Titik terjauh dan titik tertinggi

Pembahasannya:

Jawabannya: B

Contoh Soal 14

Gerakan parabola adalah hasil dari kombinasi gerakan lurus reguler pada sumbu horizontal (sumbu x) dan perubahan tidak teratur gerakan lurus pada sumbu vertikal (sumbu y). “…

A. Newton
B. Robert Boyle
C. Galileo Galilei
D. Steve Roger

Diskusi:

Pernyataan itu dibuat oleh Galileo Galilea, sehingga diperoleh

Jawabannya: C

Contoh Soal 15

Pembahasan nya:

Jawabannya: D


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