IPS PC Boca Quiz #1 Review
Reaction in a Bag
- Used as a Ph indicator-
- Ph Scale- Measures acidity, goes from 0-14, 0-7 Acid, 7 Neutral, 7-14 Alkaline, Lemon Juice 1.5, Tums 10 brings down heartburn.
- Below 7 turns yellow.
- Above 8 turns pink
Solid A- Calcium Chloride
- Hydrotropic: Absorbs water (Attracted to water)
- Uses: canned veggies (keeps from getting mushy), electrolyte (in sports drink), and flavor pickles (salty flavor)
Solid B- Sodium Bicarbonate
- Baking Soda.
- Not acidic.
- Uses: Making volcanoes with vinegar, baking, toothpaste, and laundry detergent.
- Exothermic Reaction- Hot temperature.
- Endothermic- Cold temperature
Sodium Bicarbonate (Baking Soda and Solid B)
Reaction from Phenol Red (Red Liquid), Calcium Chloride (Solid A), and Sodium Bicarbonate (Solid B).
Phenol Red (Red Liquid)
Heating Baking Soda Post Lab
- Temperature cooler on the top of the test tube than the bottom of the test tube.
- Condensation comes from hot gas touching cooler top of test tube, turning back into a liquid.
- Heating an empty test tube: no condensation, and water bottle not draining.
- Heated test tube- Dark orange color.
- Unheated test tube- Light orange color.
- Both test tubes cannot be baking soda because the unheated test tube baking soda and the heated test tube baking soda do not look the same.
- Control Group- Unheated baking soda (Did not do anything to the baking soda and knew what was in it.)
- Experimental Group- Heated Baking soda.
- Indicator- Tea (Indicates that heated baking soda is no longer baking soda.)
- Control Factors- Same type of tea, same amount of tea, same amount of baking soda, and same size test tube.
- Variable- Category You try to measure.
- Independent Variable- On its own (causes change in dependent variable)- temperature.
- Dependent Variable- Affected by independent variable-color of the tea.
- Hole in the tubing- Will not see gas fill the bottle.
- Stopper is not snug- Will not see gas fill the bottle.
- Not cleaning stirring rod before the beginning- Contaminates/mixes substances.
- Less (equal to) because condensation comes from baking soda cannot produce more than itself.
Safety Quiz Notes
- Goggles must be kept OVER YOUR EYES until Mr. Leeds says to put the away.
- Report ALL accident/spills to Mr. Leeds immediately.
- Try your best to use common sense.
In Case of Emergency:
- Nurse ext: 2828
Safety Equipment in Classroom:
- Fire extinguisher.
- Fire blanket.
- Eye wash/shower.
- Never taste chemicals (even if they look yummy!)
- Always WAFT liquids to detect odor.
- NEVER WAFT SOLIDS/POWDERS.
- Avoid touching chemicals.
- Always wash hands with soap and water after lab.
- If chemicals touch skin: flush skin with water for 1 minute AND notify Mr. Leeds.
- Hot glass 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, NOT just pull back (or u cannot do lab).
- Never walk away from a lit burner.
- Never point the open end of a hot test tube at yourself or someone else.
- Do not look down into a test tube/beaker while it is being heated.
- Make sure burner is capped and flame is out when done.
End of Experiment:
- CLEAN-UP AREA AND MATERIALS COMPLETELY!!!! (Or you LOSE points)
- Make certain that burner is out if one was used.
- Keep goggles on (over eyes) until Mr. Leeds says to put them away.
Box Question #1-13
- Why do you think baking soda is used in baking?
- Baking Soda is used because when heated releases gas which allows dough, butter to rise (bread muffins cupcakes etc.)
3.How many cubic centimeters of water are required to fill a graduated cylinder to the 50.0-mL mark?
- 50 cubic centimeters.
4. Rectangular box A has a greater volume than rectangular box B but the length of box A is less than the length of Box B. How is this possible?
- It is possible because box A can have a greater width and/or a greater height.
5. Adding a stone to a graduated cylinder containing 25 cubic centimeters of water raises the water level in the cylinder to the 32 cubic centimeters mark. What is the volume of the stone?
The volume of the stone is 7 cubic centimeters.
6. A student has a large number of cubes that measures 1 centimeter along each edge. (If you find it helpful, use a drawing or a set of cubes to answer the following questions.)
A. How many cubes will be needed to build a cube that measures 2 centimeters along each edge.
- 8 cubes will be needed to build a cube that measures 2 centimeters along each edge.
B. How many cubes will be needed to build a cube that measures 3 centimeters along each edge?
- 27 cubes will be needed to build a cube that measures 3 centimeters along each edge.
C. What is the volume, in cubic centimeters, of each of the cubes in (a) and (b)?
- The volume in cubic centimeters of cube (a) is 8 and the volume in cubic centimeters of cube (b) is 27.
7. One rectangular box is 30 centimeters long, 15 centimeters wide, and 10 centimeters deep. A second rectangular box is 23 centimeters long, 16 centimeters wide and 15 centimeters deep. Which box has the larger volume?
- The second rectangular box has a larger volume than the first rectangular box.
8. Figure A shows a cone-shaped graduated used for measuring the volume of liquids. Why are the divisions not equally spaced.
- The divisions are not evenly spaced because in figure A, it is cone-shaped and not all of the area is the same width, and it gets wider as it goes up. As the height increases, the width increases as well.
9. The scale in Figure B is in centimeters.
A. Estimate the positions of arrows I and II in Figure B(a) to the nearest 0.1 centimeter. Can you estimate their positions to 0.01 centimeter?
- No you cannot estimate to the hundredths place because you cannot measure 2 units past what is given, only 1 unit.
- I- 1,2 Centimeters
- II- 3.8 Centimeters.
B. Estimate the positions of arrows III, IV, and V in Figure B(b) to the nearest 0.01 centimeter. can you estimate their positions to the 0.001 centimeter?
- No you cannot estimate to the thousandths place because you cannot measure 2 units past what is given only 1 unit.
- III- 1.64 centimeters.
- IV- 2.53 centimeters.
- V- 4.50 centimeters.
C. Why should you report the positions of the arrows in part (b) to the nearest 0.01 centimeter and not to the nearest 0.1 centimeter?
- It will be a more precise measurement to got to the hundredths place instead of the tenths place.
10. What part of a cubic centimeter do the smallest divisions on each of the graduated cylinders in Figure C represent? Express your answer as a decimal.
- Figure A= 0.1
- Figure B= 0.2
11. What is the level of the liquid in Figure D(a) to the nearest half division? What is the level in Figure D(b) to the nearest half division?
- Figure A= 4.0 cubic centimeters
- Figure B= 1.3 cubic centimeters
12. Three students reported the length of a pencil to be 12 centimeters, 12.0 centimeters, and 12.00 centimeters. Do all three readings contain the same information?
- 12 cm: 11.5-12.4
- 12.0 cm: 11.95-12.04
- 12.00 cm: 11.995- 12.004
13. What advantage is there to making graduated cylinders narrow and tall rather than short and wide?
- The advantage to making graduated cylinders narrow rather than large is because the lines are farther apart because less surface so wider cylinders need more depth to make up.
Balance and Volume Notes
- Unit of measurement: cubic centimeter.
- Volume= l x w x b.
- Standart unit of length= meter.
- 1 centimeter (1cm_= .01 meter.
- 100 cm= 1 meter.
- Unit cube one centimeter cube (1 cubic centimeter per side).
- A small cube 1 cm on each edge.
- Volume of Liquids
- Use a graduated cylinder to measure volume.
- Always check the intervals of scale.
- Units milliliters (mL) or cubic centimeters .
- 1 mL= 1 cm.
- Check that pans are clean and dry.
- Always zero balance before EACH measurement
- Use adjustment knob if needed.
3. Never switch pans.
4. Pick up balance by red bar only.
5. Zero balance when done.