シャドーイング練習: KS3 Chemistry - The periodic Table - 動画で英語スピーキングを学ぶ
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33 文
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In this video we're going to learn about the periodic table.
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So we'll cover what the periodic table tells us about the structure of atoms in different elements, how the table organises elements into metals and non-metals,
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what groups and periods are, and then also how patterns in reactions can be predicted using the periodic table.
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Let's begin by looking at what the periodic table tells us about different elements.
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Now the periodic table organises all of the known elements, and everything in the universe is created from different combinations of the elements in this table.
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Each element is shown in a separate box, so for instance this box shows copper and this one shows oxygen.
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If we use sodium as an example, we can see that every box contains three pieces of key information.
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Firstly we can see the one or two letter symbol for each element, in this case it's Na which stands for sodium.
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Next we can also see the number of protons each atom of that element has.
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Then lastly we can see this larger number here
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which tells us the total number of protons plus neutrons in an atom of that element.
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So now let's move on to see how the periodic table organises elements.
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Just like a book the periodic table is read from left to right and from top to bottom, with the elements arranged in order of an increasing number of protons.
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Sometimes you might see a zigzag line running along here, and this line separates the metals, shown here in orange, from the non-netals here on the right, shown in blue.
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Now the table's organised into vertical columns called groups and horizontal rows called periods.
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So starting on the far left, we have group 1, then groups 2, 3, 4, 5, 6, and 7.
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And then at the end, rather than group 8, it goes to group 0.
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Group 1 elements are known as the alkali metals, whilst group 7 are the halogens, and group 0 are the noble gases.
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This block in the middle here are all metals, but you don't need to worry about their group numbers, so just remember to skip them when you're counting your groups.
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Then to finish up, let's take a look at how patterns in reactions can be predicted using the periodic table.
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The first thing to know is that the elements within a group usually all have similar chemical properties.
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As an example, all the elements in group 1 here react strongly with water, and they're all soft and shiny.
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Meanwhile, all the elements in group 0 are really unreactive, which basically means that they're very unlikely to react with anything else.
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There are also patterns within groups though.
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In the case of group 1, they become more reactive as you go down the group.
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What this means is that even though all the elements are reactive, the elements lower down in group 1 react much more strongly than those higher up in the group.
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For instance, when lithium reacts with water it just fizzes a bit, but when rubidium reacts with water it explodes violently.
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On the other hand, if we look at group 7, the elements become less reactive as you go down the group.
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So fluorine is the most reactive while astartine is the least reactive.
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If you haven't heard yet you can find all of our videos on our website cognito.org.
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You'll also find questions, flashcards, exam style questions and past papers.
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And we track all of your progress so that you always know what to study next.
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sign up for free by clicking here or browse our playlist here on YouTube.
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このレッスンの語彙とスピーキングのポイント
このC1レベルのスピーキングレッスンは、動画「KS3 Chemistry - The periodic Table」を教材にしています。 繰り返し出てくる語は次のとおりです：element, table, periodic, reactive, metals。 この動画には、シャドーイング用の文が33文、単語が599語あります。 音声の長さは3:42です。 話す速さは1分あたり約162語で、日常会話に近い自然なペースです。 単語の84%は英語の頻出3,000語に含まれます。残りは練習の前に確認しておきましょう。
この動画の重要語彙
動画の中で特に難しい単語15語を、発音と意味つきで紹介します。
| 単語 | 発音 | 意味 |
|---|---|---|
| periodic 形容詞 | /ˌpɪɹiˈɑdɪk/ | 周期的 |
| proton 名詞 | /ˈpɹoʊ.tɑn/ | 陽子 |
| atom 名詞 | /ˈætəm/ | 原子, アトム |
| sodium 名詞 | /ˈsəʊ.di.əm/ | ナトリウム |
| predict 動詞 | /pɹɪˈdɪkt/ | 予言する |
| alkali 名詞 | /ˈæl.kəˌlaɪ/ | アルカリ |
| flashcard 名詞 | /ˈflæʃˌkɑɹd/ | 教材用のカード, フラッシュカード |
| fluorine 名詞 | /ˈflʊ(ə)ɹˌin | フッ素, 弗素 |
| halogen 名詞 | /ˈhæl.ə.d͡ʒən/ | ハロゲン |
| neutron 名詞 | /ˈnu.tɹɑn/ | 中性子 |
| rubidium 名詞 | /ˌɹuːˈbɪd.i.əm/ | ルビジウム |
| zigzag 名詞 | /ˈzɪɡ.zæɡ/ | ジグザグ |
| lithium 名詞 | /ˈlɪθi.əm/ | リチウム |
| browse 動詞 | /bɹaʊz/ | 閲覧する |
| playlist 名詞 | /ˈpleɪˌlɪst/ | プレイリスト, 再生リスト |
動画に出てくる句動詞
| 単語 | 意味 |
|---|---|
| go down 動詞 | 降りる, 降下する |
注意したい発音
話し手はthey're, don't, haven'tなど、短縮形や弱形を8回使っています。聞こえたとおりの短い形で発音しましょう。
- 「sh」と「zh」の音: flashcard /ˈflæʃˌkɑɹd/, combinations /kɑmbɪˈneɪʃənz/
- 長い単語（アクセントの位置に注意）: periodic /ˌpɪɹiˈɑdɪk/, rubidium /ˌɹuːˈbɪd.i.əm/, violently /ˈvaɪ(ə)ləntli/, combinations /kɑmbɪˈneɪʃənz/, horizontal /ˌhoɹəˈzɑn.təl/
この動画での練習方法
- まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
- まず0.75倍速で一文ずつシャドーイングし、慣れてきたら通常の速度に戻します。
- 自分の声を録音して元の音声と比べます。periodic, proton, atomなどの単語に特に注意しましょう。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。