Trimester I Science Review

If you are unclear about a specific step in the lab, you should _____.

• stop immediately, and seek the teacher’s help.

• do your best and try to make it work.

• ask the group closest to you for assistance.

• skip the step and go to the next step.

A student, while performing a lab with an open flame, had on a baggy shirt. The sleeve of the shirt caught on fire. What is the first thing you should do?

• Calmly get the fire blanket and wrap the student tightly and quickly.
  

• Get the fire extinguisher and aim the nozzle directly toward the flame.

• Yell for help, and hope that someone will know what to do next.

The safety shower is to _______ as the eye wash station is to ___________.

• washing off paint, diluting various containers of different solutions.

• acids on the body, objects or chemicals in the eye.

During a lab, the directions state to smell the unknown substance in the beaker. You should do so by:

• placing the beaker about 8 inches from your nose and wafting or waving your hand smelling the moving air.

• hold the beaker at an angle and have your lab partner smell the unknown substance.

• place the beaker under your nose and smell the unknown substance.

• being careful not to directly sniff the substance, but place the beaker just close enough to smell.

At the conclusion of the lab, you should ensure that____.

• all lab equipment is cleaned and returned to the assigned area.
  

• you wash your hands before you leave class.

• Both A and B are correct.

• Neither A and B are correct.

Which of the following is not recommended when working with any electrical device?

• Check the cord and make certain the area is dry.
  

• Working with equipment with a damaged cord.

• Follow the directions as explained in the lab.
  

• Use the device only as instructed.

Oxygen gas (O2) is an example of...

• an element

• a mixture

• a compound

H2O is an example of ...

• a mixture

• a compound

• an element

What is Kool-aid?

• An Element

• Heterogenous Mixture

• Homogeneous Mixture

• A Compound

When sandpaper smooths a piece of wood, this is an example of a __________.

• change of state

• physical change

• change of matter

• chemical change