IPC Unit 1 Review

Which practice poses the greatest safety concern?

• talking to others in the lab

• accumulating clutter on the lab bench

• following directions

• reading the temperature of a water bath

The MSDS for glacial acetic acid says that it is a flammable liquid that can severely burn any human tissue it comes in contact with. It reacts with bases, various metals, and strong oxidizing agents. Its vapors can form explosive mixtures with air.

Based on this information, which statement is applicable to glacial acetic acid?

• It should be heated to remove moisture and stored on a lab shelf.

• It should be handled on a clean, dry area of the lab bench.

• It should be stored in an iron container, away from open flames.

• It should be handled in a fume hood, away from open flames.

What information in the MSDS would be most important to know at the end of an experiment?

• the boiling point

• the flammability

• the disposal procedure

• the reactivity

The MSDS for sodium hydroxide gives it a health rating of 3, a flammability rating of 0, and a reactivity rating of 1.

According to the MSDS, which best describes sodium hydroxide?

• highly corrosive but not highly flammable

• highly reactive and corrosive

• highly flammable but not highly corrosive

• not highly reactive or corrosive

Which is always the first step in dealing with an accident in the lab?

• Call the emergency number, 911.

• Call the fire department.

• Notify the teacher.

• Read the MSDS information.

Miranda gets a small cut on her thumb after she breaks a beaker, and she begins to look around for the lab first aid kit.

What important first step should she have taken?

• She should have first called 911.

• She should have first informed her whole class.

• She should have first called a doctor or a nurse.

• She should have first notified the teacher.

The table shows five items that a person may consider including in a safety contract.

Which three of the five items would be best to include in a safety contract?

• 1, 2, and 3

• 1, 2, and 5

• 2, 3, and 4

• 3, 4, and 5

Chris is about to do an experiment to measure the density of water at several temperatures. His teacher has him prepare and sign a safety contract before beginning the experiment.

Which item is most likely part of the safety contract?

• Understand how to deal with water safely in the lab.

• Bring an electronic copy of the MSDS on a personal laptop.

• Do not discuss the experiment with other students in the lab.

• Inspect the glassware for cracks or chips prior to beginning the lab.

Which statement best describes how an existing theory is often affected by the development of new technology?

• An existing theory is thrown out and replaced with a completely new theory based on the new observations.

• An existing theory is modified so that it can explain both the old and new observations.

• An existing theory remains the same because a theory is a proven fact that is always true.

• An existing theory is kept unchanged while a new theory is developed to explain the new observations.

Ingrid wrote the hypothesis below.

If the temperature of a liquid increases, the density of the liquid decreases because the particles move farther apart.

What are the variables in her hypothesis?

• The independent variable is the temperature, and the dependent variable is the density.

• The independent variable is the density, and the dependent variable is the temperature.

• The independent variable is the temperature, and the dependent variable is the distance between particles.

• The independent variable is the distance between particles, and the dependent variable is the temperature.

Tags

NGSS.MS-PS1-4