Solutions & Mixtures
Alicia made a solution of lemonade using a powdered drink mix. She added 26 grams of the drink mix to 355 grams of water.
What is the solute in Alicia’s lemonade?
Powdered drink mix
What type of change involves a color change, gas production, and temperature change?
chemical change
What are the chemical symbols for the elements in glucose?
C, H, and O
What is the total kinetic energy in an object called?
What is it called when solid water becomes liquid?
melting
Alicia made a solution of lemonade using a powdered drink mix. She added 26 grams of the drink mix to 355 grams of water.
What is the percent concentration of Alicia’s lemonade solution?
6.82%
Step/Procedure
Student Observations
1
Observe and describe the appearance of calcium chloride, sodium bicarbonate, and phenol red solution
2
Place the following three substances in separate locations in a sealable plastic bag that is lying flat on a table.
a. 1 tablespoon of calcium chloride
b. 1 teaspoon of sodium bicarbonate
c. 10 mL of phenol red indicator solution
3
Squeeze out as much air as possible from the zipper-lock bag and seal it. Allow the contents to mix thoroughly.
4
carefully observe (by means of sight and touch) the changes that take place in the zipper-lock bag. Have students record all their observations in Data Tab
What was the evidence that a chemical change occurred in the bag experiment?
color change, temperature change, gas production, and bag expansion
How many atoms of carbon are in caffeine (C₈H₁₀N₄O₂)
8
What is the transfer of thermal energy called?
heat
What phase change occurs when water vapor becomes liquid?
condensing
What is the solvent when Alicia dilutes her lemonade?
What happens to molecules when temperature increases
they gain kinetic energy
What is the atomic number of oxygen
8
What is the process where heat moves until two substances reach the same temperature? T______ E______
thermal equilibrium
What happens during boiling?
liquid water changes to gas as thermal energy is added
Alicia made a solution of lemonade using a powdered drink mix. She added 26 grams of the drink mix to 355 grams of water.
What is the concentration of the diluted lemonade solution?
74.7%
What effect does stirring have on dissolution? Does it increase or decrease the dissolution rate?
increases the dissolution rate
Is caffeine a molecule or a formula unit?
molecule
What material slows down or stops the flow of heat?
insulator
What is the transfer of heat through direct contact?
conduction
How does surface area affect the rate of dissolution?
Hint: The greater the __________, the greater the ________.
the greater the surface area, the greater the dissolution rate?
Describe the appearance of calcium chloride, sodium bicarbonate, and phenol red solution
How many atoms of each element are in citric acid (C₆H₈O₇)
6 carbon, 8 hydrogen, and 7 oxygen
What is the transfer of heat through electromagnetic waves?
radiation
What is the name of heat transfer through fluids caused by warming and cooling?