Reaction in a Bag Study
Purpose: Record observations when multiple chemicals are combined and to understand the chemicals.
Lab safety: Wear goggles and aprons
Red liquid: Phenol Red "used to indicate Ph scale".
- 0-7 yellow
- 8-14 pink
Solid A= Calcium chloride also Hydro tropic and acidic
Solid B= Sodium Bicarbonate (Baking Soda)
Heating Baking Soda Study Guide
Control factors: Same amount of tea, and the same amount of baking soda, Same size test tubes and same stirring time.
Color difference and Heated is usually darker.
Box Q: To release gas when heated.
1. Why do you think baking soda is used in baking?
Baking soda is used in baking to make the dough rise.
MAKE SURE YOU WEAR GOGGLES WHEN YOU USE A BURNER OR WORK WITH GASES.
Control Group: Unheated
Experimental Group: Heated
Variable: Something you try to measure
Independent Variable: Causes change in temperature
Unit of Measurement: CM3 (Cubic Centimeter)
Volume = L x W x H or "A x B x C"
Standard unit of length = meter (m)
1 centimeter (1cm) = .01m
100cm = 1m
*A small cube 1 cm on each side
Volume of Liquids
Use a graduated cylinder to measure volume
units = (ML) or CM3
1 ML = 1 CM3
Read from the bottom of the meniscus
Box Questions - page 8
3. 50CM3 of water are required to fill a graduated cylinder to the 50.0-mL mark.
4. A has a greater volume than rectangular box B but the length of box A is less than the length of Box B because A has bigger height or width.
5. the volume of the stone is 7CM3.
6(a). Eight (8) cubes will be needed to build a cube that measures 2 cm along each edge.
6(b). Twenty-seven (27) cubes will be needed to build a cube that measures 3 cm along each edge.
6(c). The volume of each of the cubes in (a) and (b) is 8+27 = 35CM3
7. The second box has the larger volume.
8. The divisions are not equally spaced because the cone shaped graduate used for measuring the volume of liquids is wider on top and than it becomes narrower.
Lab Safety Notes
*Goggles must be kept over your eyes (until Mr. Leeds says to put them away).
*Report accidents to Mr. Leeds immediately.
*Use common sense.
IN CASE OF EMERGENCY - Nurse ext: 2828
SAFETY EQUIPMENT IN CLASSROOM
Eye wash / shower
*WAFT liquids to detect odor
*NEVER waft solids / powders
*Avoid touching chemicals
*Wash hands with soap / water after lab
*If chemicals touch skin - flush skin with water for 1 minute AND notify Mr. Leeds
*Hot and cold glass look the same
*Never use chipped or broken glass
*Never use force to remove or insert glass
*Roll up sleeves, put up long hair
*Never walk away from a lit burner
*Never point the open end of a hot test tube at yourself or someone else
*Don't look down into a test tube or beaker while it is being heated
*Make sure the burner is capped and the flame is out when done
END OF EXPERIMENT
*Clean up area and materials completely!!!
*Make sure the burner is out if one was used
*Keep goggles on (over eyes) until Mr. Leeds says to put them away
To find the sensitivity of the balance you find the change in mass over the number of yes's.
Chapter 2 Test Part 1
- Mass of gas= The cap not on tight enough
- Mass of copper and sulfur=The rubber sheet pops off.
- Ice and water lab= Condensation out side the bottle
Part 2: Analysis
ALWAYS USE SCIENTIFIC NOTATION
Also remember David that it is MF-MI is the delta M or change in mass.
Epsom salt is the street name for MAGNESIUM SULFATE.