NPS [Prelab] Energy Flow in a Bag

This is called a glass dropper.

It will contain chemicals. What should you do when you are finished using this?

• Leave the lid slightly open for the next person to use

• Close the lid tightly to avoid spillage

Make sure to avoid letting the glass dropper touch any chemicals. Why do you think that is?

• Because glass droppers are too expensive to replace if damaged.

• Because it could cause contamination between chemicals.

• Because glass droppers are difficult to clean.

One of the chemicals that you will use tomorrow is called calcium chloride.

This will cause skin irritation and possible burns, especially if the skin is wet or moist.

How should you safely? transfer this chemical?

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You will need two test tubes in this lab. Which image shows test tubes?

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You will need to measure the exact mass of chemicals. What tool will you need?

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What should you do with glassware at the end of the lab?

• Leave them on the lab table

• Rinse them and return to Lab 9

• Throw them away

While you are in the lab area, at which part of your body should the safety goggles be worn at ALL TIMES?

What should you do with the scale at the end of the lab?

CHOOSE TWO ANSWERS

• Close the lid

• Turn off the scale

• Leave it on for the next class

Fill in the blank:

At the end of the ​ (a)   , you can dispose of all the ​ (b)   chemicals down the ​ (c)   .

• lab
• used
• sink

At the end of the ​ (a)   , any ​ (b)   chemicals can be ​ (c)   to Lab Station 9.

• lab
• unused
• returned