Safety

Which of the following represents an unsafe lab practice?

• if a lab activity only deals with common household items, it is acceptable to touch with bare hands

• never mix chemicals unless specifically directed by your teacher

• always wear approved safety eye ware in the lab when directed

• clear off your work area except for materials needed in the experiment

The term corrosive can be defined as _______________.

• highly flammable

• having a strong odor

• loss of elasticity in plastics

• eating away of materials by a chemical reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When you clean up after a laboratory activity you should _________.

• dispose of all used solutions by carefully diluting them with water in the sink

• dispose of all solid wastes by placing them in the nearest trash can

• return all unused chemicals to their original containers

• dispose of unused and used materials as directed by the instructor

Which of the following is the best immediate treatment when a chemical is splashed into the eye?

• Rub your eyes with the fire blanket.

• Rinse the eye immediately at the eyewash station for 10-15 minutes.

• Wash out the eye with a weak solution of boric acid.

• Close your eye tightly and run to the nurse.

Which information can be obtained from a MSDS?

I.        How flammable a substance is.

II.      How hazardous a substance is to your health.

III.    How to properly dispose of a substance.

• I and II only

•   II and III only

•   I and III only

• I, II and III

Tags

NGSS.MS-PS1-2

When the lab requires the use of protective eye wear, ____________________.

• it is not so much a requirement as it is a suggestion for safety

• prescriptive lenses are considered a valid substitute

• must be worn at all times unless otherwise directed by the instructor

• the lab will always involve toxic chemicals

Which of the following demonstrates an unsafe lab practice?

• using disposable gloves when handling staining or caustic materials

• preheating a beaker on a hotplate prior to adding the solution

• not wearing safety glasses when measuring mass of a solid metal to determine density

• placing all glassware towards the center of the table

Where in the lab should hazardous materials be kept when they are being used for an activity?

• All materials should be carefully brought to individual lab tables to minimize spillage.

• Hazardous materials should be carefully passed from one lab group to another.

• There is no real concern with the handling of hazardous materials when in the lab area.

• Materials should remain under the fume hood where all individual collections should be made.

There are occasions when you need to dilute a substance in water to create an aqueous solution. Which of the following correctly describes the procedure for creating an aqueous solution?

• The water should be added to the container prior to the addition of the solute to prevent hazardous material from splashing.

• The solute should be added to the container prior to the addition of the water to prevent hazardous material from splashing.

• The water and the solute should be added simultaneously to prevent hazardous material from splashing.

• There are no specific procedural steps for combining solutes and solvents.