Quiz Study Guide
- Test liquids by wafting them.
- If something spills/breaks, get Mr. Leeds.
- Wash hands with soap and water after working with chemicals.
- Never use force when working with glass.
- Make sure lab area is clean before leaving class.
- Caping the alcohol burner puts out the flame because fire needs oxygen.
- Wear safety goggles until Mr. Leeds says to take them off.
- The nurses number is 2828.
- Report all accidents to Mr Leeds as soon as it happens.
- Never throw broken glass into the regular trash bin.
- If chemicals get on your skin, you should flush with water and tell Mr. Leeds.
- Be careful because hot and cold glass look the same.
- Don't use cracked test tubes.
- Keep safety goggles on even when cleaning up.
- clean up after every experiment.
- The emergency blanket is used when a person is on fire to wrap around them.
Three important safety tips when working with an alcohol burner:
- Never leave a burner
- Cap flame when done
- Be careful picking up burner
Three safety precautions you should take when using chemicals:
- Don't touch chemicals
- Don't taste chemicals
- Only waft chemicals
Three pieces of safety equipment located within classroom:
- Fire extinguisher (near front door)
- safety blanket (in the back)
- eye wash (opposite of front door)
Reaction in a Bag Lab
- Purpose: to record the observations that occur when multiple chemical substances are combined and to use my observations to understand the reactions of the chemicals.
Red liquid (phenol red)
- ph indicator
Calcium chloride (Substance A)
- calcium and chloride
- mildly acidic
- absorbs water
- used in:
- canning vegetables (keeps them from getting mushy)
- sports drinks
- flavored pickles (salty flavors)
Sodium bicarbonate (Substance B)
- not acidic
- baking soda
- used in:
- laundry detergent
Baking Soda Lab
- Purpose: to observe and record the reaction that occurs when baking soda is heated.
- Condensation/moisture from top of test tube comes from hot gas touching cooler top of tube; turns back into liquid (gas is from baking soda)
- Heated VS Not Heated: color difference
- control group: unheated test tube
- experimental group: heated test tube
- indicator: tea (shows that heated test tube is not baking soda)
- variable: something you try to measure
- independent variable: causes a change in dependent variable (temperature [heat])
- dependent variable: color of the tea
- same type of tea
- same amount of tea
- same amount of baking soda
- same temperature
- same stirring time
- same size tube
Volume of Liquids:
- Unit of measurement: cm3 (cubic centimeters)
- volume: LxWxH
- Standard unit of length: meter
- One centimeter= .01m
Volume of Liquids:
- use graduated cylinder to measure volume
- units: milliliters (mL)
- check that pan is clean and dry
- zero balance before massing
- push all riders to zero
- adjust if needed
- never switch pans
- pick up balance by red bar only
- don't zero balance when done