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catrinamat
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https://hunterschools.myschoolapp.com/ftpimages/602/download/download_2996847.pdfQuestions
- Why must the bottom of the thistle tube extend below the surface of the liquid in the Erlenmeyer flask?
- Attempt: The bottom of the thistle tube must extend below the surface of the liquid in order to prevent reactive gasses from entering the liquid.
- In a future lab in which we collect oxygen gas, we will place the bottles mouth up on the table. Why do you think we store the bottles of hydrogen mouth down?
- Attempt: We store the bottles of hydrogen mouth down in order to keep gas from escaping due to the surface tension of the gas.
- When instructed by your teacher, light a wooden splint with your Bunsen burner, and carefully insert it into the bottle of hydrogen you have collected. Be sure to hold the bottle upside down. Record your observations.
- The splint reacted with the hydrogen, creating a loud "pop" sound.
- Place samples of different metals -- calcium, magnesium and sodium -- into three different beakers of water containing phenolphthalein. Observe carefully.
- Make a list of the metals in order of decreasing reactivity. Include all of your observations about each reaction and a word equation representing the reaction you observed.
- I don't know what a word equation means, but all the metals changed the color of the phenolphthalein on the top layer to a magenta color.
- List at least 3 physical properties of hydrogen that you observed.
- Reacts audibly with fire
- Has high surface tension
- Is not flammable
- When hydrogen burns in air, liquid droplets are often observed at the mouth of the container. What, specifically, is the origin of these?
- From the pressure of the reaction, causing condensation.
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