How Might You Tell Whether or Not Your Toothpaste Contained

question 52

Multiple Choice

How might you tell whether or not your toothpaste contained either calcium carbonate, CaC , or baking soda, NaHC , without looking at the ingredients label?

• A) if the toothpaste bubbles when heated
• B) if the toothpaste bubbles when added to ammonia, such as window cleaner
• C) if the toothpaste produces a salt (NaCl) when added to HCl
• D) if the toothpaste bubbles when added to vinegar

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Definitions:

First Quartile

The first quartile is a statistical measure that divides a data set into four equal parts, representing the value below which 25% of the data falls.

Hours

Units of time equivalent to 60 minutes, commonly used to measure durations and periods of the day.

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The activity of engaging in games that involve interaction with a user interface to generate visual feedback on a display device.

Lower Quartile

A statistical measure indicating the value below which 25% of the observations in a dataset fall.