Part B
9: Solid Mixtures
There are a number of mixtures that are solid at room temperature. Brass is a mixture of copper and zinc. Soil (dirt) is also a
solid a room temperature. Which is homogeneous, brass or soil? What test would you use to determine this?
10: Liquid Mixtures
Salt water is a ________________ mixture that is liquid at room temperature. Orange juice is a ________________ mixture .
Which is homogeneous, tomato soup or vegetable soup? How did you determine this?
11: Substances – Elements vs Compounds In our life we work almost exclusively with compounds, but a few objects are
elements, such as iron. The biggest reason for that is that elements tend to combine into compounds. If its name is on the
periodic chart, it is an element. Element or compound? Aluminum (Al)____________ Table Salt (NaCl)__________________
Using the periodic chart, find 5 elements you recognize. Record their names and their chemical symbol:
Part C – Hit the Trail!
12. Look at the mixture in Bag A. What do you see?
13. Would this mixture be classified as a heterogeneous or homogeneous mixture? Give a reason for your answer.
14. What is the total mass of your mixture? Be sure to subtract the mass of the Ziploc bag. Record this amount in the “Mass of
Mixture” column on the chart.
15. Separate the parts of the mixture and find the mass of each group. Use the formula provided to calculate the percentage
for each part of the mixture. Record your data in the chart.
Name
Mass (g)
Mass of Mixture (g)
% of Mixture
FORMULA: mass of substance divided by the mass of mixture. Take this number and multiply it by 100. Round to the nearest
hundredth.
Part A: Identify the solutes and solvent in each solution. Underline the solute and circle the solvents. Remember that a
SOLUTE dissolves in a SOLVENT!
1. Ocean water: salt and water
2. Antifreeze: water and ethylene glycol
3. Soda: Syrup, water, and CO2 gas
4. Gold jewelry: gold and copper
5. Kool-Aid: powder, sugar, and water
6. Lemonade: water, lemon juice, sugar
7. Air: nitrogen, oxygen, and other gases
8. Sterling Silver: silver and copper
What liquid is called the “Universal Solvent?
Which would have the most SOLUTE: a glass of very sweet Kool-Aid or a glass of barely sweet Kool-Aid? Explain your
answer:
Part D: See the Light
16. Create 4 different mixtures by following these steps:
a. Mix 10 grams of salt with 100 mL of water. Label it D-1
b. Mix 10 grams of flour with 100 mL of water. Label it D-2
c. Mix 10 grams of Kool-Aid powder with 100 mL of water. Label it D-3
d. Mix 10 grams of dirt with 100 mL of water. Label it D-4
17. Shine a flashlight through each sample. What do you observe about each mixture?
a. D-1:
b. D-2:
c. D-3:
d. D-4:
18. Read the information then answer the questions:
One property of a colloid that distinguishes it from a true solution is that the particles in a colloid scatter light. If a beam of
light passes through a colloid, the light is reflected or scattered by the particles in the colloid and the path of the light can be
observed. The scattering of light by colloids is known as the Tyndall Effect.
19. Which 2 mixtures would be classified as colloids?
20. Which 2 mixtures would be classified as solutions?
21. Name the solutes and the solvents for the solutions:
22. Describe a situation in which you would observe the Tyndall Effect: