matter has mass and takes up space. states of matter solid liquidgasplasma
TRANSCRIPT
MATTER
HAS MASS AND TAKES UP
SPACE
STATES OF MATTER
SOLID LIQUID GAS PLASMA
CHARACTERISTICPROPERTIES
BOILING POINTMELTING POINTCHEMICAL ACTIVITYDENSITY
PHYSICAL CHANGE ALTERS THE FORM-no new
substance is produced Physical change rearranges molecules but doesn't affect their
internal structures. Some examples of physical change are: whipping egg whites (air is forced into the fluid, but no new
substance is produced) magnetizing a compass needle (there is realignment of groups
("domains") of iron atoms, but no real change within the iron atoms themselves).
boiling water (water molecules are forced away from each other when the liquid changes to vapor, but the molecules are still H2O.)
dissolving sugar in water (sugar molecules are dispersed within the water, but the individual sugar molecules are unchanged.)
dicing potatoes (cutting usually separates molecules without changing them.)
CHEMICAL CHANGE FORMS NEW SUBSTANCE Chemical change is any change that results in the
formation of new chemical substances. At the molecular level, chemical change involves making or breaking of bonds between atoms. These changes are chemical:
iron rusting (iron oxide forms) gasoline burning (water vapor and carbon dioxide
form) eggs cooking (fluid protein molecules uncoil and
crosslink to form a network) bread rising (yeast converts carbohydrates into
carbon dioxide gas) milk souring (sour-tasting lactic acid is produced) suntanning (vitamin D and melanin is produced)
PHYSICAL OR CHEMICAL
MIXTURE Two or more substances that are mixed together but not chemically combined
PROPERTIES OF MIXTURES + Substances retain their identity
+ Can be physically separated
+Components do not have a definite ratio
ELEMENTA SUBSTANCE IN WHICH ALL ATOMS ARE ALIKE
ATOM THE SMALLEST PARTICLE OF AN ELEMENT THAT HAS ALL THE PROPERTIES
COMPOUND A SUBSTANCE MADE OF TWO OR MORE ELEMENTS CHEMICALLY COMBINED
CHEMICAL BONDFORCE THAT HOLDS TWO ATOMS TOGETHER
Properties of compounds
+Elements combine in a definite ratio
+Every compound has a unique set of properties-different from the elements that form it
+Can be broken down into simpler substances through chemical change
DEMOCRITUS 440 B.CDEVELOPED THE FIRST ATOMIC THEORY
DALTON THEORY 1802
ATOMS CANNOT BE BROKEN INTO SMALLER PIECES
IN ANY ELEMENT, ATOMS ARE EXACTLY ALIKE
ATOMS OF TWO OR MORE ELEMENTS CAN COMBINE TO FORM COMPOUNDS
ATOMS OF EACH ELEMENT HAVE A UNIQUE MASS
MASSES OF THE ELEMENTS IN A COMPOUNDS ARE ALWAYS CONSTANT RATIO
QUESTIONS TO ANSWER
1. MATTER IS _______ 2. STATE OF MATTER WITH A
DEFINITE VOLUME BUT NO DEFINITE SHAPE IS ____
3. STATE OF MATTER WITH THE MOST ENERGY IS ________
4. NAME TWO CHARACTERISTIC PROPERTIES OF MATTER ________
IDENTIFY AS MIXTURE, ELEMENT, COMPOUND
A. SALT WATER B. SUGAR C6H12O6
C. HYDROGEN D. WATER E. SAND AT THE BEACH G. HELIUM
6. 2 statements from Dalton’s atomic theory
7. What phase change is involved in boiling pt.
8. A chemical change always involves what?