The element mercury - Marvel EDU

Loading question...

You are in free guest mode. Timed Practice Revision List Attempt History Progress Tracking Create a free account to unlock these tools

Prev Next

Practice Listening: Highlight Incorrect Words ID: #34825 Short The element mercury

Instructions ›

You will hear a recording. Below is a transcription of the recording. Some words in the transcription differ from what the speaker said. Please click on the words that are different.

* Click on the words that are different from what you hear

Result:

Correct Transcript:

The element mercury has been shown to damage the human nervous system. Yet since 1856, mercury amalgam is "the" filling dentists have used to repair our teeth. Now a study in the journal Chemical Research in Toxicology indicates that mercury fillings actually lose their toxic potential over time, Canadian scientists used x-ray spectroscopy to compare new mercury amalgams to those about 20 years old. After two decades, 95 percent of the elemental mercury on the surface of a filling had gone through a chemical reaction. It became beta mercury sulfide, a black-colored solid. Which explains why fillings dull with age. And the compound isn't absorbed by the body, which means it can't affect the body the way elemental mercury can. Of course, this study does not settle the question of how potentially harmful a new mercury filling is.

AI explanationShows the answer. Tap to open.

Printed "fluctuates", the speaker says "indicates"

Explanation: The speaker says "indicates that mercury fillings", not "fluctuates". They start with different letters, so listen to the whole word.

Printed "gymnasium", the speaker says "Canadian"

Explanation: Listen for "Canadian scientists used x-ray". They start with different letters, and the printed word also ends differently.

Printed "ripeness", the speaker says "scientists"

Explanation: You will hear "scientists used x-ray spectroscopy". The spoken word is longer, so listen for a longer word.

Printed "catastrophe", the speaker says "beta mercury"

Explanation: On the recording the words are "beta mercury sulfide". The printed word is much longer, so trust the short phrase you hear.

Printed "invades", the speaker says "explains"

Explanation: Listen again to "explains why fillings dull with age". The two words start with different letters, so listen to the start.

Printed "extradition", the speaker says "question"

Explanation: In the audio you hear "question of how potentially harmful". They start with different letters, but both end the same, so listen to the start.

Printed "timidity", the speaker says "potentially"

Explanation: Here the speaker says "potentially harmful a new mercury". The spoken word is much longer, so wait for a longer word.

"mercury" matches the audio

Explanation: "The element mercury has been" looks repeated and may seem wrong, but the speaker says it exactly. Do not click it.

"amalgam" matches the audio

Explanation: "Yet since 1856, mercury amalgam is "the"" sits near changed words. The speaker says it exactly, so do not click it.

The rest of this explanation is for members. Sign in free to read why the other options are wrong, key words and tips.

With a free account: Retry and compare every attempt.

Be the first! No community answers here yet. Submit yours and help others learn.

Saving...