Research
What is the first step of the scientific method?
Form a research question
What is the part of a solution that dissolves?
Solute
What happens to most solids’ solubility as temperature increases?
It increases
What is a concentrated solution?
A solution with a lot of solute
Like dissolves ______
Like
What is a hypothesis?
An educated guess based on observation
If a solution is liquid, what is the state of matter of the solvent?
liquid
If you dissolve 2g of salt in 200ml of solution, what is the concentration in mg/L?
10,000 mg/L
Two solutions have different amounts of solute and solvent. How can you tell if their concentration is the same?
Calculate their percent concentrations
You're trying to dissolve sugar in cold iced tea... but it’s taking forever. What could you do to speed it up?
Stir it or warm it up!
How many sources should you ideally use to verify a piece of scientific information?
2-3 sources
What substance is often bonded into molecule clusters of 2 or more atoms?
elements
What does a solubility graph tell you?
Changing either temperature or pressure changes how much solute can dissolve in a solvent.
What happens if you add the maximum amount of solute to a solution?
It becomes saturated
True or False: all homogeneous mixtures are solutions, but not all solutions are homogeneous mixtures.
False
What search engine is commonly used for finding reliable research and academic publications?
Google scholar
True or False: A heterogeneous mixture is always evenly mixed.
False (ex. salad!)
What do we call the maximum amount of solute that can dissolve in a solvent?
Solubility
A pharmacist prepares a disinfectant solution by mixing 235 mL of ethanol with 365 mL of water. What is the volume percent of ethanol in the solution?
~39%
Give an example of a gas solute.
CO₂ in soda
How many data categories are there among the research skills steps?
4: collecting, recording, organizing, and interpreting
How do you determine the solute in vinegar?
The solute can present in smaller proportions such as acetic acid (5%)
Name 2 factors that affect solubility.
Temperature, stirring, amount of solute, type of solvent
A chemist needs to prepare 250 g of a 6% (m/m) solution. How much solute should they use?
15 g
avocado