chemistry

What does chemistry mean

• the study of the composition of matter and the changes that matter undergoes

• the study of the building of matter and the changes that matter undergoes

How do the physical and chemical properties of matter differ?

• Physical: Traits of a substance you can see or measure without altering it.

  Chemical: Its reaction to different chemicals.

• Physical a characteristic of a substance that can be observed or measured without changing the substance.

  Chemical= The way the substance reacts to different chemicals (reactivity)

Examples of physical properties

• Color, odor, mass, density, specific heat, malleability, ductility, conductivity, melting point, boiling point, magnetism.

• Color, scent, weight, compactness, heat capacity, pliability, stretchiness, current-flow, melt and boil thresholds, attraction to magnets.

Examples of chemical proporties

• Flammability, reactivity with water/oxygen/acid/base

• Burning ability, interaction with water/oxygen/acid/base.

How do physical and chemical changes differ

• Physical= a change in property.

  Chemical= formation of a new substance

• Physical: A shift in characteristics.

  Chemical: The birth of a fresh substance.

Example of physical change

• Transformations of form (melting, freezing, sublimation, condensation, vaporization).

• Changes of state or phase (melting, freezing, sublimation, condensation, vaporization.

Example of chemical change

• combustion, electrolysis, oxidation, tarnishing

• Burning, electric separation, rusting, discoloration.

Describe solid, liquid and gas phase particles

• Solid= Rigid, Fixed Shape, Fixed Volume, Cannot Be Squashed

  Liquid= Not Rigid, No Fixed Shape, Fixed Volume, Cannot Be Squashed

  Gas= Not Rigid, No Fixed Shape, No Fixed Volume, Can Be Squashed

• Solid: Stiff, set form, set amount, un-squishable.

  Liquid: Flexible, shapeless, set amount, un-squishable.

  Gas: Flexible, shapeless, variable amount, squishable.

Which state or phase of matter usually has the lowest density?

• Gases are squishable and occupy any space you place them in.

• Gases because they can be compressed and fill anything you put them in.

True or false- density formula is D=m/v

• True

• False