跟讀練習: Identifying Chemical Properties - 通過影片學習英語口語
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Hi everyone.
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Today, we're going to do problems that involve us identifying chemical properties.
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Let's take a look at the example problem we have below.
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identify the chemical properties below.
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So we have to take a look at all the properties we have here and see which ones are chemical properties.
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Before we go on to do that, let's think about what chemical properties are.
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Remember, chemical properties are things that we can only observe
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during a chemical reaction so a change or an attempt to change the chemical composition of a substance.
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so here Toxicity toxicity has to do with how how bad something is for you.
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So toxicity, how does it change the chemical composition to make something Worse, let's say, for your body.
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so toxicity would be an example of a chemical property because we could only observe it through a change
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and how in and effects a chemical reaction.
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So something in your body, your body is run with chemical reactions, and
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If something is toxic to those chemical reactions or a drug is toxic to those chemical reaction it's because it
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changed or messed with the chemical reaction.
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So that must mean it is a chemical property.
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So, flammability is also an example.
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of a physical property of a chemical property, sorry.
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Chemical property, that just means Can't it.
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be observed without changing the chemical composition of something?
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No, it can't.
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We have to burn something to see if it if it changes.
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And by doing that, we're doing a chemical reaction.
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conductivity we could see if something transfers electricity or heat without changing the chemical composition.
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So that must mean C. is out.
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Viscosity means how thick something is or how hard it is to get through it.
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Let's say if you try to put your hand through water, it goes through pretty easily.
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But if you try to put your hand through water, syrup it wouldn't go through as easily and so this is also an example
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of something that we don't need to observe using a chemical reaction.
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D is out of there.
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Now, E, radioactivity, is tricky.
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it's something that involves sending out radiation.
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But this only happens through chemical processes and we can't observe it or measure it,
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without it changing the chemical chemical properties, the chemical composition of a substance.
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So, that must mean it's also a chemical property,
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because again, chemical properties only can be observed if something changes about the chemical composition.
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關於本課
在本課中，學習者將練習識別物質的化學性質。通過詳細分析化學屬性的定義與例項，比如毒性、可燃性、電導性和放射性，學習者將深入理解化學反應中觀察到的變化。此課旨在提高學生的理解能力，幫助他們在進行英語口語練習時，能夠更加自信地討論化學相關的主題。藉助該內容，學習者不僅可以提升英語水平，也能為雅思口語練習做準備。
關鍵詞彙與短語
- 毒性 (Toxicity) - 一種化學性質，指物質對生物的危害程度。
- 可燃性 (Flammability) - 物質與火焰接觸時的反應能力。
- 電導性 (Conductivity) - 物質傳導電流或熱量的能力。
- 粘度 (Viscosity) - 物質流動的難易程度。
- 放射性 (Radioactivity) - 物質發射輻射的能力，通常涉及化學過程。
- 化學反應 (Chemical Reaction) - 物質的化學組成發生變化的過程。
- 化學組成 (Chemical Composition) - 物質所包含的元素和化學合成。
- 觀察 (Observe) - 識別和理解現象的能力。
練習技巧
在進行英語口語練習時，可以嘗試收聽影片內容並進行模仿（shadowing），這對提高聽力和口語能力大有裨益。看YouTube學英語時，注意影片的語速和語調，保持與發音者的節奏一致，特別是在處理較難的化學術語時。使用 shadowspeaks 方法，先逐句重複，再整體流暢地連貫起來，有助於加深理解與記憶。練習時，可以錄製下自己的聲音，回聽並糾正發音，以便在雅思口語練習中表現得更加自然。此外，遇到難以理解的內容可多次回放影片，確保掌握每個關鍵詞彙的含義和用法。通過持續的練習，學生將能在與化學相關的英語會話中游刃有餘。
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| 被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的 | is run · be observed · can be observed |
| 義務：must / have to / need to 表示某事是必要的 | have to take · must mean · have to burn |
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。