Name: __________________________
Class #_________
Mixtures
BCS 448 – 7 grade Science
th
Date: __________
Inquiry/L.T: ________________________________________________________________________________
Journal Entry:
Observe the demo of mixing:
a) Baking Soda (NaHCO3) with Water (H2O) and b) Baking Soda and Vinegar (CH3COOH).
In a paragraph:
1- Give qualitative observations for each demo
2- Explain which combination created a chemical change and why.
3- Explain which combination was only a physical change and why.
Some qualitative observations I made were___________________________________________________________
_____________________________________________________________________________________________
The___________________________combination created a ______________change because__________________
_____________________________________________________________________________________________
The____________________________combination created a ______________change because__________________
_____________________________________________________________________________________________
Define Mixture:
Heterogeneous (Het-er-o-jean-us) Mixture:
Homogeneous (Homo-jean-us) Mixture:
Examples:
Examples:
Mixture of different seeds
Bag of M&M’s
Cake batter
Kool-aid
Homogenous and Heterogeneous Mixture Mini Lab
Directions: For each Lab follow the steps exactly. After you finished the steps write your observations
and complete the table.
Lab 1: Water and Food Coloring
Step 1: Pour 100 ml of water into the plastic cup
Step 2: Take the food coloring and drip TWO drops in to the cup of water
Step 3: Stir with the plastic spoon for 30 seconds
Observations: _I noticed that____________________________________________________________
___________________________________________________________________________________
Lab 2: Water and Oil
Step 1: Pour 100ml of water into the GLASS beaker
Step 2: Pour 2 spoonfuls of oil into the water in the glass beaker
Step 3: Stir with the same plastic spoon for 30 seconds
Observations: _I noticed that____________________________________________________________
___________________________________________________________________________________
Lab 3: Pepper and Salt
Step 1: Pour 2 spoonfuls of salt into the other plastic cup
Step 2: Pour 2 spoonfuls of pepper into the same plastic cup with the salt
Step 3: Stir with the same plastic spoon for 30 seconds
Observations: _I noticed that____________________________________________________________
___________________________________________________________________________________
Directions:
Check the boxes whether the labs produced a homogenous mixture, a heterogeneous mixture, or a
chemical change. Explain why you believe this (use evidence).
LAB
#1: Water and
Food coloring
Homogenous
Mixture
Heterogeneous
Mixture
Chemical
Change
Explanation why
(Evidence)
Ex. I believe that the water and food coloring
created a __________________ because____
____________________________________
#2: Water and
Oil
#3: Salt and
Pepper
Dissolving Salt in water.
What type of mixture is this? Why?
a) Homogeneous Mixture
Explain:___________________________________
__________________________________________
b) Heterogeneous Mixture
Explain:___________________________________
__________________________________________
(TURN PAGE OVER)===
Solution:
Examples:
Solubility:
Soluble:
Insoluble:
Example:
Example:
Complete the Venn diagrams below
Heterogeneous Mixture
Homogeneous Mixture
Solution
Mixture