IPS Quiz #1-Tristan Wille
Safety Quiz - Measuring Lab
For Every Lab:
- Goggles worn at all times
- Report all spills/accidents immediately
- Use common sense
- Nurse - extension 2828
- Fire extinguisher
- Fire blanket
- Eye wash/shower
- Never taste/touch/smell
- Always waft liquids, never waft solids
- Always wash hands after lab
- Flush affected areas with water for one minute
- Hot and cold glass look the same
- Don't use chipped or broken glass - dispose in proper trash can
- Never use force to insert or remove glass
- Roll up sleeves, put up hair
- Never leave a hot burner alone
- Never point end of hot test tube at yourself/ others
- Do not look down into test tube when being heated
- Make sure to cap burner/ cap from side.
- Clean - Up area and materials
- Make sure burner is out
- Keep goggles on
Purpose -> Conclusion - Reaction Bag
Data: Solid A - Off-white color, flaky appearance
Solid B - White, granulated power
Red Liquid - transparent red liquid, smells like paint
Reaction A + B + Red: Turned into a warm, yellow, bubbly substance with specks of pink. Bag filled with air.
Experimental Errors: If there was a little hole in the bag, the gas would be released, you would never know it was there
Conclusion: The purpose of the Reaction in a Bag lab was to record the observations that occur when multiple chemical substances are combined and to use my observations to understand the reactions of the chemicals. The chemicals that we used created a strange substance. It was yellow, bubbly, hot, filled with gas, and there were specks of pink; however, my partner and I think the pink was a result of the red liquid. I noticed in the other part we did, with Substance B and water, that there was no reaction. I think this is because our bag was already contaminated with water and the substances from the previous experiment. It helped me learn what would happen when we use multiple ingredients to make a reaction. I have come to the conclusion that combining these substances causes many factors such as temperature, color, gases being produced and others. I have come to this conclusion because during the lab I observed the way the chemicals reacted and the factors that occurred due to way the specific chemicals reacted with each other.
This scientist did the lab a little different than we did, but got the same results! Credit to YouTube user - sciencefix
Post-Lab Reaction in a bag
Used as a pH indicator
Below 7 -> pink
Above 8 -> yellow
pH scale: Measures acidity. Goes from 0-14 0-6 acid 7 neutral 8-14 base/alkaline.
Lemon juice - 1.5
Tums - 10
Solid A: Calcium Chloride
Hydrotropic - absorbs water
Uses: canned veggies, electrolytes, flavors pickles
Solid B: Sodium Bicarbonate
Heating Baking Soda Purpose -> Conclusion
- What do you observe at the bottom of the test tube?
- What do you observe near the top of the test tube?
- What do you observe in the inverted bottle?
- Where do you think the gas came from?
- Where did the droplets on the test tube come from?
Heated: The baking soda dissolved, tea mixed, made a clear, light brown liquid
Unheated: Did not mix or dissolved, baking soda stays at bottom as milky white solution, tea is on top of it
- Describe the color of the liquid in each tube
- Are the two white powders the same substance?
1. There could be a little hole in the rubber tube and the gas would never make it to the test tube.
2. There could be a chip in the test tube through which the gas escapes
Conclusion: The purpose of the lab was to observe and record the reaction that occurs when baking soda is heated. I noticed how the water traveled through the tube and made it to the test tube. I also was shocked by how little was visible but how much was occurring since I expected something like the baking soda blowing up. As for the tea experiment the change that the heated baking soda underwent shocked me. I conclude that I observed and recorded the reaction that occurred when baking soda was heated.
Extra Question: Is the amount of condensation that forms at the top of the heated test tube more or less than the amount of baking soda being heated? Explain your answer.
Less since the condensation comes from baking soda and cannot produce more than itself.
All credit to YouTube user: Kathy O'Connor
Heating Baking Soda Post-Lab
Control Group: unheated
Experimental Group: Heated
Indicator - Tea - showed the experimental group was not baking soda.
Variables - a category you try to measure
Dependant - Tea color
Independant - causes a change in the dependant variable - temperature
Control factors: same tea, amount of baking soda, amount of tea, size of test tube.
Volume = lwh
Unit of length: meter
centimeter = 0.1 meter
meter = 100 cm
Unit cubes - 1 cm each side
Volume of liquids:
Use graduated cylinder : to measure volume always check the intervals or scale
units = mL or cm3.
1mL = 1 cm3
Single Pan Balances
Always zero balance before massing.
- Push all riders to zero
- Use the adjustment knob if provided
Pick up balance by red bar
Don't zero when done
It makes the pastry puff up when the gas is released.
3. How many cubic centimeters of water and required to fill a graduated cylinder to the 50mL mark?
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?
The width and height are larger.
5. Adding a stone to a graduated cylinder containing 25 cm3 of water raises the water level in the cylinder to the 32 cm3 mark. What is the volume of the stone?
6. A student has a large number of cubes that measure 1 cm along each edge.
6a. How many cubes will be needed to build a cube that measure 2cm along each edge?
6b How many cubes will be needed to build a cube that measures 3cm along each edge?
6c What is the volume, in cm3 of each cubes in (a) and (b)?
8cm3 and 27cm3
7. One rectangular box is 30 cm long, 15 cm wide, and 10 cm deep. A second rectangular box is 25cm long, 16cm wide and 15cm deep. Which has the larger volume?
The second one.
8. Figure A shows a cone-shaped graduate used for measuring the volume of liquids. Why are the divisions not equally spaced?
As the surface increases the depth decreases.