McKinney ISD

Working with Heat Fire or

McKinney ISD Heat or Fire

McKinney ISD 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.

McKinney ISD 1. Use a hot plate only when specifically instructed. 2. If you have long hair, pull it away from your face or put in a ponytail. 3. Use tongs or heavy gloves to handle hot items.

McKinney ISD 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.

McKinney ISD 6. Never point container at anyone while it is being heated. 7. Keep all extra materials away from heat sources. 8. Handle hot liquids with care.

McKinney ISD 9. Turn off the heat source as soon as you are finished with it.  Do not move the hot plate or burner.  Hot and cold glassware look exactly the same.

McKinney ISD Working with Electrical Equipment Electrical Equipment

McKinney ISD Electrical Hazard

McKinney ISD 1. Do not leave electrical cords where someone could trip over them. 2. Keep cords away from a heat source and water. 3. Never touch electrical equipment or cords with wet hands.

McKinney ISD 4. Turn off all equipment when finished with an investigation. 5. Grasp the plug to disconnect equipment. Do not pull on the cord.

McKinney ISD Working with Sharp Objects

McKinney ISD Sharp/Pointed Object

McKinney ISD 1. When cutting, place the object on a flat surface. Do not hold it in your hand. 2. Always handle sharp instruments carefully. They can cause severe cuts if used incorrectly.

McKinney ISD 3. Do not walk fast or run with sharp objects in your hands. 4. Always cut away from your body and others.

McKinney ISD Working with Chemicals

McKinney ISD 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 sheet or lab write-up for the right equipment.

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

McKinney ISD 1. Keep your hands away from your face, eyes, and body while using solutions. 2. Don’t taste test papers such as pH or litmus. Never place testing chemicals such as Benedict’s Solution in your mouth. 3. Dispose of litmus paper, wooden splints, tooth picks,and paper towels in the appropriate, designated container.

McKinney ISD 4. Label and date all containers that are used to hold chemicals.  The white patch on many pieces of glassware can be used to mark the containers.  Use a pencil to mark on these patches. Erase marks when you are finished using the glassware.  If no white patch is present, a china marker or wax pencil can be used.

McKinney ISD 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.

McKinney ISD

Corrosive Substance

McKinney ISD 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 depends on the chemical properties of the substance.

McKinney ISD

1. Acids and bases easily react with other substances. 2. When acids are combined with water they can splash and get on your hands, your face, or in your eyes.

McKinney ISD 4. If you need to combine an acid or a base with water, remember: Always add acids and bases to water NOT the other way around. 3. If you get any chemical on your clothes or your skin, notify the teacher immediately.

McKinney ISD Final Reminders Final Reminders

McKinney ISD  modifying lab procedures.  performing activities outside the lab procedure.  an injury occurs. Always follow your teacher’s instructions when:

McKinney ISD Always follow your teacher’s instructions when:  throwing away chemicals and other materials.  cleaning up spilled materials.  cleaning up broken glassware.

McKinney ISD No Horseplay or Fooling around in the laboratory!

McKinney ISD Laboratory Work comes before talking! or Always Practice Lab Safety