1. What is an element in chemistry?
2. Who is the author credited with the particle model of matter that explains the behavior of particles in different states?
3. What is the primary role of separation techniques in chemistry?
Elements — definition?
Pure substances with one atom type.
Compounds — role?
Chemically bonded elements with fixed ratios.
Mixture types — examples?
Solutions, suspensions, colloids.
Homogeneous mixture — characteristic?
Uniform composition throughout.
Heterogeneous mixture — characteristic?
Visibly different components.
Separation technique — filtration?
Separates solids from liquids.
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