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.
Distillation — mechanism?
Separates by boiling points.
Physical properties — examples?
Melting point, density, solubility.
Chemical properties — examples?
Reactivity, flammability, oxidation.
Pure substances — examples?
Elements and compounds.
Mixture classification — based on?
Particle size and uniformity.
Particle model — in solids?
Particles are tightly packed, vibrating.
Particle model — in gases?
Particles are far apart, move freely.
States of matter — examples?
Solid, liquid, gas.
Chemical reaction — sign?
Color change, gas, temperature change.
Reacts with oxygen?
Oxidation or combustion.
States change with?
Temperature and pressure.
Particle energy increases?
Particles move faster, may melt or evaporate.
Elements on periodic table?
Pure substances with one atom type.
Compounds — chemical formula?
Shows ratio of atoms, e.g., H₂O.
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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?
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