CH 2 FINAL EXAM GUIDE Flashcards
what is an extensive property
An extensive property is a property of matter that changes as the amount of matter changes. Like other physical properties, an extensive property may be observed and measured without any chemical change (reaction) occurring.
Are Mass and Volume Intensive or Extensive properties?
Extensive. As more matter is added to a system, both mass and volume changes.
what is an intensive property?
Intensive properties do not depend on the amount of matter in a sample. They are the same whether you’re looking at a large amount of material or tiny quantity. An example of an intensive property is electrical conductivity. The electrical conductivity of a wire depends on its composition, not the length of the wire.
Are Bioling Point, Color, Density and solubility are intensive or extensive properties?
boiling point, color, density and solubility are all examples of intensive properties.they are the same no matter how much of it you’re viewing.
Difference between Physical vs. Chemical properties?
A physical property is an aspect of matter that can be observed or measured without changing its chemical composition. Examples of physical properties include color and volume. The only way to observe a chemical property is by performing a chemical reaction. Examples of chemical properties include reactivity, flammability and oxidation states.
Label the following as a chemical or physical change… ability to rust
chemical
Label the following as a chemical or physical change.. melting point.
physical, since the chemical identity of the matter in question is unchanged, this process represents a physical change.
Label the following as a chemical or physical change.. brittleness.
Brittleness is a physical property i.e. a consequence of how the atoms or other simplest unit (polymeric chain) is arranged in the physical space/system so that it breaks under a physical stress.
Label the following as a chemical or physical change.. reactivity with vinegar.
chemical: reacts with vinegar to produce a new substance
Label the following as a chemical or physical change.. flammability.
flammability is a chemical property of matter because the only way to know how readily a substance ignites is to burn it. In the chemical reaction for combustion, the reactants and products are different.
Label the following as a chemical or physical change.. density.
physical
is the following a physical or chemical change; cut your hair
physical
is the following a physical or chemical change: baking soda reacts with vinegar and forms a gas
chemical
is the following a physical or chemical change: piece of metal is bent in half
physical
is the following a physical or chemical change: an aspirin is crushed into fine powder
physical
is the following a physical or chemical change: copper turns green when exposed to the environment
chemical
is the following a physical or chemical change: two clear lquids are mixed and a yellow color forms
chemical
Matter is classified in 3 categories. What are they?
solid, liquid and gas
what are the characteristics of a solid
strong intermolecular forces particles vibrate in place low kinetic energy (KE) definite shape definite volume incompressible high density (as compared to same substance as a liquid or gas) low rate of diffusion (millions of times slower than in liquids) may be crystalline or amorphous
what are the characteristics of a liquid
moderately strong intermolecular forces fluid - particles slip/slide past each other moderate Kenetic energy - enough to “stretch” the intermolecular forces indefinite shape definite volume incompressible only slightly less dense (about 10%) than solids able to diffuse exhibit surface tension exhibit capillary action exhibit viscosity
what are the characteristics of a gas
weak intermolecular forces fluid - particles move easily high KE - enough to break all intermolecular forces indefinite shape indefinite volume easily compressed low density able to diffuse exert pressure on any surface with which they collide
