U2 Chem Test

what is kinetic energy?

what is kinetic energy?

energy in form of motion

what is diffusion

spreading of particales throughout a given volume until they are uniformly distributed

what are examples of pure substances

nitrogen, water, and leaf

what is a pure substance

compound or element that cannot be broken down into simpler components and still maintain the properties of the original substance

what state of matter have the least amount of kinetic energy?

solids

what state of matter has the most kinetic energy?

Gases

condensation

Gas to liquid

deposition

gas to solid

sublimation

Solid to Gas

homogenous mixture

contains 2 or more substances blended evenley throughout Ex: Salt water, kool aid, milk, brass, gasoline, air, vinegar

heterogenous mixture

mixture where different materials can be distinguished easily Ex: Granite, soil, pizza, italian dressing

Physical properties

quality or condition tht can be observed or measure

physical Changes

alters a material without changing its composition Ex:cracking eggs, ice melting/boiling, glass breaking

Chemical properties

ability of a substance to undergo a chemical reaction and to form a new substance Ex:Reactivity and Flammability

chemical changes

alters materials composition making a new substance and new properties

examples of chemical changes:

release of energy: Heat, light and sound

Change in Temp

bubbles

change in color or oder

physical change Ex:

Dissolving, size and shape change, freezing and melting, boiling and evaperation, condensation (Gas to liquid), Sublimation and Deposition.

The earths Atmosphere is an example of a

homogeneous mixture

What are considerd physical properties?

color, Density, and volume

list the state of matter from slowest molecular movement to fastest

solid-liquid-gas

Would a temp of 20 Deg Celcius have more kinetic energy or a temp of 40 deg. Celcius?

40 deggrees celcius

If a substance floats on top of another substance it is-

less dense

what statement best explains the Law of consservation of mass if 100 grams of Ca CO are present before the chemical reaction takes place?

The total mass of the product is EQUAL to the mass of the CaCO3