What a Labster!
CSI - Crimes Science Investigates
Wild Weather
The Wizard of Os
Feeling Bobaly
200
You are working in the lab and Ms. E asked you to grab approximately 75 mL of water. What lab equipment will you use to measure the volume of water?
A flask or beaker
200
It is well known in the veterinary community that cats are picky eaters. This can make it difficult to get cats to take medicine hidden in food. So a veterinarian decided to do a study to see which treat works best for hiding medicine so that cats will eat it. He set up a field experiment in which he visited clients' houses and laid out 5 different treats out in front of their cats to see which treat they ate. Each of the treats had the same type of medicine hidden inside them. He did this with 50 cats until he found a treat brand that was favored by 80% of the cats. Now he can recommend those treats to clients when they need to get their cats to take their medicine.
1. What is the control group?
2. What is the experimental group?
There is no control group.
The experimental group is the 50 cats receiving the 5 different treats.
200
Define the 4 main properties of water.
Cohesion - water attracted to itself
Surface Tension - when the surface of a liquid resists outside forces
Adhesion - water attracted to other substances
Capillary Action - allows water to travel up containers due to its attraction to the sides
200
Define the different types of water transport. Explain and provide an example of each.
Passive transport - requires no energy. Examples are diffusion and osmosis.
Active transport - requires energy. Example is reverse osmosis.
200
What was the goal of the boba lab?
The goal was to find an isotonic solution to preserve the freshness, texture, size, taste, shape, etc. of boba so it can be sold to consumers ready to use.
200
Define length, mass, and volume. What units do we use for each?
Length - used to describe how long or short something is - use cm or mm
Mass - used to describe how heavy or light something is - use g
Volume - used to describe how much space something takes up (also deals with size) - mL
200
It is well known in the veterinary community that cats are picky eaters. This can make it difficult to get cats to take medicine hidden in food. So a veterinarian decided to do a study to see which treat works best for hiding medicine so that cats will eat it. He set up a field experiment in which he visited clients' houses and laid out 5 different treats out in front of their cats to see which treat they ate. Each of the treats had the same type of medicine hidden inside them. He did this with 50 cats until he found a treat brand that was favored by 80% of the cats. Now he can recommend those treats to clients when they need to get their cats to take their medicine.
What was the independent variable for this experiment?
What is the dependent variable for this experiment?
Independent variable - the type of treat
Dependent variable - the cats
200
Why doesn’t rain water damage its surroundings?
Air resistance in the air is overcoming the surface tension of water, breaking it into smaller drops.
200
What are the 3 types of solutions an object can be placed in? Explain all 3.
Isotonic - Since the concentration of water is the same inside the object and in the solution, the water will move in and out of the object equally. The size of the object will stay the same since the water is moving in and out of the object equally.
Hypertonic - Since the concentration of water is high inside the object and low in the solution, the water will move out of the object and into the solution. The size of the object will shrivel since the water will move out of the object and into the solution.
Hypotonic - Since the concentration of water is low inside the object and high in the solution, the water will move from the solution and into the object. The size of the object will swell since the water will move from the solution and into the object.
200
Why should we test the bobas in solutions for 72 hours and not immediately or after 30 minutes?
Leaving boba balls in the solutions for 72 hours ensures that the there is enough time for the water to reach equilibrium (osmosis)
200
What is a solution? How do we measure the ratio of a solution?
Solute : solvent
Solute per solvent
200
You are working at a clinic and you gathered some data about some clients as can be seen in the table to the right. What graph would work best to illustrate this data? Explain!!
A single bar graph since we have both qualitative and quantitative data. The graph will showcase visually which symptom was the most common in the clinic.
200
How do tiny cloud droplets turn into rain drops?
What property of water is involved in how cloud droplets turn into rain drops?
Water droplets double in size by attracting other water droplets. They stick on in a process called coalescence. It increases in size again and again until it’s so heavy it falls away.
Cohesion. Water is attracted to itself.
200
What are the 2 main differences between osmosis and reverse osmosis?
Osmosis is the diffusion of water across a membrane from high concentration of water to low concentration of water until equilibrium is reached.
Reverse osmosis is when pressure is applied, water goes through a membrane from low water concentration to high water concentration leaving behind salt and other contaminants.
200
Why should we collect data on the fresh bobas before placing them into the solutions you created?
Collecting data on fresh bobas before placing them in solution will allows to compare the size before and after, the mass before and after, and texture before and after to determine of the solution is in fact, isotonic, hypertonic, or hypotonic.
200
What are 2 main differences between an Erlenmeyer flask and a beaker?
A flask has a thin neck which is used to prevent spilling when mixing chemicals. It is used for storage and mixing liquids.
A beaker has a beak which is used for pouring liquids. It is used for mixing liquids.
200
What is the difference between an observation and an inference?
An observation is information about an object that we gather with our senses.
An inference is an assumption we make about an object based on what we observe.
200
What is the process of how a hailstone falls from a cloud?
1. It starts in a thundercloud.
2. Water droplets in thunder clouds freeze due to the height.
3. The warm weather keeps the drops supported in the cloud where they collect more water with new layers freezing on in a separate shell.
200
What is the difference between solute and solvent?
Solute = substance that dissolves.
Solvent = substance solute dissolves in
200
Why did you need to create a texture scale?
We need a texture scale to determine of the boba is edible. It is possible that the boba balls do not change in size or even diameter on average and yet the texture of the boba is hard or squishy.
200
What is the process for how to measure the volume of this tiny toy dinosaur?
1. Add water to graduated cylinder.
2. Measure the initial volume of water in graduated cylinder.
3. Place tony dinosaur in graduated cylinder.
4. Measure final volume of water in graduated cylinder.
5. Subtraction initial volume from final volume and this will equal the volume of the toy dinosaur.
200
What is CER? Define all parts!!!
Claim - A statement that answers the original question or problem. It is the argument, the stance, or the main idea of the writing that is to follow.
Evidence - The appropriate data or work that supports the claim. Quantitative observation/data. Qualitative observation/data
Reasoning - Explains why or how the evidence supports the claim. This is important because the same pieces of evidence can be used to support opposing claims.
200
How does a cloud work? How is it able to float even though it is made of water which is heavier than air?
It works by breaking down liquid water into tiny droplets of water. The cloud floats because the water droplets inside them are so small and light.
200
What is the difference between diffusion and osmosis?
Diffusion is the movement of molecules from an area of high concentration to an area of low concentration until equilibrium is reached. This can happen in water and/or air. No membrane or barrier is required.
Osmosis is the diffusion of water across a membrane from high concentration of water to low concentration of water until equilibrium is reached.
200
How will you know if the solution that the boba balls were in was isotonic, hypertonic, or hypotonic?
If the boba balls increased in size and mass and the texture was squishy, the the solution is hypotonic.
If the boba balls decreased in size and mass and the texture was hard, then the solution is hypertonic.
If the boba balls did not change in size, mass, or texture, then the solution is isotonic.