© 2006 Plano ISD, Plano, TX

Heat Fire Working with or

© 2006 Plano ISD, Plano, TX Heat or Fire

© 2006 Plano ISD, Plano, TX When working with heat or fire, you will need to wear safety goggles. To move hot objects you will need to use the right tongs. Different types of containers use different sets of tongs

© 2006 Plano ISD, Plano, TX 1.Use a hot plate when specifically instructed to do so. 2.If you have long hair make sure it is pulled away from your face. 3.Use tongs or heavy gloves to handle hot items. 4.Do not put your face or hands over any boiling liquid. 5.When heating chemicals or other materials, be sure the containers are made of heat proof glass.

© 2006 Plano ISD, Plano, TX 6.Never point a heated container at anyone. 7.Keep all materials away from heat sources unless specifically instructed to heat it. 8.Handle hot liquids with care. 9.Turn off a heat source as soon as you are finished with it.  Don’t move it until it has cooled.  Leave a note to indicate that a hot plate has been recently used…it doesn’t look hot.

Bunsen Burner Safety

© 2006 Plano ISD, Plano, TX The laboratory gas burner is designed to heat a small area with a hot flame. This makes the burner useful for heating glassware such as test tubes and beakers.

© 2006 Plano ISD, Plano, TX 1.Never use a heat source without wearing safety goggles. 2.Maintain a clean work area and keep all material away from flames. 3.Never leave a flame unattended; when the burner is not needed, turn it off. 4.Never reach across a flame. 5.Make sure you know how to light the burner correctly.

© 2006 Plano ISD, Plano, TX 6.Never heat a liquid in a closed container. The expanding gases produced may blow the container apart, harming you or others. 7.Never pick up a container that has been heated without first holding the back of your hand near it. 8.Always use a mitt, clamp or tongs when handling hot containers. REMEMBER: Hot glassware looks the same as cool glassware.

© 2006 Plano ISD, Plano, TX Working with Electrical Equipment Electrical Equipment

© 2006 Plano ISD, Plano, TX Electrical Hazard

© 2006 Plano ISD, Plano, TX 1.Do not leave electrical cords out where someone might trip over them. 2.Keep cords away from heat and water. 3.Never touch electrical equipment or cords with wet hands. 4.Turn off all equipment when you are finished with the investigation. 5.Grasp the plug when you disconnect your equipment. Do not pull on the cord.

© 2006 Plano ISD, Plano, TX Working with Sharp Objects

© 2006 Plano ISD, Plano, TX Sharp/Pointed Object

© 2006 Plano ISD, Plano, TX 1.When cutting, place the object on a flat surface. Do not hold it in your hand while cutting. 2.Always handle sharp instruments carefully. They can cause severe cuts if used incorrectly. 3.Do not walk fast or run with sharp objects in your hands.

© 2006 Plano ISD, Plano, TX Working with Chemicals

© 2006 Plano ISD, Plano, TX When working with chemicals, you will need to wear safety goggles. Regular eyeglasses do not give adequate protection. Many chemicals require the use of gloves. Check your MSDS or lab write up for the right equipment.

© 2006 Plano ISD, Plano, TX Many chemicals can stain or dissolve fabrics. Aprons should be worn to protect your clothing. Check your lab write-up or MSDS to determine if tongs are needed to handle containers of chemicals.

© 2006 Plano ISD, Plano, TX 1.Never touch, taste, or smell any chemical that you do not know for a fact is harmless. 2.Keep hands away from face, eyes,and body while using solutions. 3.Don’t taste papers such as pH or litmus or any test solutions such as Benedict’s solution. 4.Be sure to use the right chemical. Read the label twice. 5.Do not return excess chemicals back to the reagent bottles or to their original containers.

© 2006 Plano ISD, Plano, TX 6.Label and date all containers that you use to hold chemicals.  Use a pencil to mark the white patch found on many pieces of glassware. Erase the marks when you are finished.  If there is no white patch, a black china marker should be used. 7.Keep combustible materials away from open flames (alcohol and acetone are combustible.)

© 2006 Plano ISD, Plano, TX 8.If the instructions include to note the fumes in an experiment, always gently wave your hand over the opening of a container and direct the fumes toward your nose. This is called wafting. 9.Do not use the same spatula to remove chemicals from two containers. Each container should have a different spatula. 10.Replace all stoppers and caps on the bottle as soon as you are finished using it.

© 2006 Plano ISD, Plano, TX Many chemicals that you use are classified as toxic. Toxic substances are poisonous. The toxic substance can be a chemical or a toxin produced by a plant, animal, or pathogenic bacteria.

© 2006 Plano ISD, Plano, TX

Corrosive Substance

© 2006 Plano ISD, Plano, TX Corrosive chemicals are substances that, by direct contact, cause injury to body tissue. The injury may be slight causing a minor burn or irritation or it may be severe enough to destroy body tissue. The chemical action that occurs will depend on the chemical properties of the substance.

© 2006 Plano ISD, Plano, TX

1.Acids and bases react easily with other substances. 2.If you get an acid or a base on your clothes or your skin, notify your teacher immediately. 3.Pour acids and bases over the sink, not the counter top. 4.If you need to combine an acid or a base with water, always add acids and bases to water, NOT the other way around.

© 2006 Plano ISD, Plano, TX Glassware Working with

© 2006 Plano ISD, Plano, TX 1.When heating glassware, use a wire or ceramic screen to protect glass ware from the flame of a Bunsen burner. 2.Never use broken or chipped glassware. Dispose of broken glassware in the designated location. 3.Never eat or drink from laboratory glassware.

© 2006 Plano ISD, Plano, TX Final Reminders

© 2006 Plano ISD, Plano, TX Always follow your teacher’s instructions when:  modifying all lab procedures as needed.  performing activities outside of the lab procedure.  when an injury occurs.  throwing away chemicals and other materials.  cleaning up spilled materials.  cleaning up broken glassware.

© 2006 Plano ISD, Plano, TX No Horseplay or Fooling around in the laboratory!

© 2006 Plano ISD, Plano, TX Labor + Oratory = Laboratory (Work-then talk about your work!)