Mixtures Case Study - Making Pencil Leads
Presentation
•
Science
•
7th Grade
•
Practice Problem
•
Hard
Tessa Borchard
FREE Resource
3 Slides • 5 Questions
1
Making Pencil Leads
How the proportions in mixtures matter
2
3
Multiple Choice
Identify the components of pencil lead
graphite, clay
graphite, clay, water
graphite, clay, wax
graphite, clay, water, wax
4
Fill in the Blanks
Water is added initially to help mix the graphite and clay.
It is removed by drying so that the pencil lead doesn't become too
5
The proportion of substances in the lead affects how hard it is.
More graphite in the lead = darker lines
Pencil hardness + their darkness
6
Draw
Draw an arrow to the pencil that has equal amounts of graphite and clay
7
Dropdown
8
Open Ended
At the start of the pencil-making process, graphite, clay and water are carefully mixed to produce "homogeneous" granules.
This means that each granule looks the same and has the same properties.
What do you think would happen if they weren't all 'homogenous'?
Making Pencil Leads
How the proportions in mixtures matter
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