Physical and Chemical Changes
Aqueous Solutions
Rate of Dissolution
Concentration
Misc.
100
This type of change does NOT result in a new substance being formed.
Physical change
100
This is the term for a solution in which the solvent is water.
Aqueous solution
100
Would sugar dissolve slower in hot tea or cold tea?
Cold tea
- higher temperatures let solutes dissolve faster
100
Concentrated or diluted- Ice melts in your drink
Diluted
100
Which container has a compound?
H2O
200
What type of change is the following?
Rust is a chemical change
200
What is the name of the substance doing the dissolving
The solvent
200
Which of the following would help a solute dissolves more quickly?
A. add more water to the container
B. put the container in the refrigerator
C. gently stir the solution
D. add more solute to the container
C- Stirring is agitation which is one of the 3 methods to speed up the rate of dissolving
200
Concentrated or Diluted- You made lemonade with three times the recommended amount of mix
Concentrated
200
What would be the following molecules? (Hint: answer would be in the form like H2O)
PCl3
300
Sam is boiling water to make macaroni, what type of change is this?
Physical change- boiling water is just a change in the state of matter
300
What two things are needed to make a solution
A solute and a solvent
300
What is agitation?
Stirring or shaking
300
Mary wants to dilute her tea- what would she need to do to it?
She would need to add water
300
Which model is Ethane C2H6
Model D
400
Describe the reaction occurring to the chocolate in this picture
The chocolate is melting which would be a physical change.
400
Name two things that could NOT be a solute for an aqueous solution
Answers may vary of insoluble things:
metal, glass, water, oil
400
Sugar cubes dissolve slower than granulated sugar. Do sugar cubes have a larger or smaller surface area than granulated sugar?
Sugar cubes have a smaller surface area
-solutes with larger surface areas dissolve faster
400
What do you need to increase the dilution of a solution that is not an aqueous solution
Add more solvent
400
Which model is Water(H2O)
Model C
500
Describe the change happening to the marshmallow AND how you knew which type of change it was.
Chemical change- we can see a change in color, and there would also be an odor produced. It has gone from marshmallow and turned into char and smoke.
500
Give an example of a solid, liquid, and gas solute that could make an aqueous solution
Answers may vary
Solid- sugar, salt, lemonade mix
Liquid- honey, squeezable juice mix, food coloring
Gas- carbon dioxide (this is what makes carbonated drinks)
500
What are the three methods to speed up the rate of dissolution.
(All or Nothing on this one)
High temperature, Larger surface area, More agitation
500
This is the term for a solution where the solvent has dissolved as much solutes as it can and can dissolve no more
Saturated Solution
500
There are both physical and chemical changes in digesting food- give one example of each
Physical- Mouth/teeth tearing up food into pieces (stomach also does this)
Chemical- Stomach acid, enzymes, saliva breaking down food into something new