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Science Study Guide

Ductility to pull a substance, typically a metal, into a thin wire
Reactivity substance to chemically react with other substances
Malleability substance to be hammered or pounded into a thin sheet
Density substance in a given volume, determines if objects will float or sink when combined physically.
Solubility substance to dissolve in another
Flammability substance to burn
Mass amount of matter in an object
Volume amount of space an object occupies
Chemical Property changes that are possible for a substance
Chemical Change process by which new substances are formed
Temperature average kinetic energy of the molecules in a substance, how fast the molecules are moving.
conduction transfer of heat by direct contact between objects
convection The transfer of heat through waves, does not require direct contact between objects.
How does a physical change differ from a chemical change? physical change- changed without change its chemical composition Chemical change- involves a chemical reaction
What are the signs that indicate that a chemical change has happened color change. gas production. release of heat. light. odor. sound
What happens to the particles of a liquid when it becomes a gas gain energy and break away from each other.
What measurement is the same as the melting point of a substance freezing point, they are opposites.
Carbon dioxide gas can enter the air from dry ice. What has to happen to the dry ice dry ice must gain energy to cause the molecules to increase in speed, forming the gas
Railroad tracks have gaps between the rails so that they will not buckle in hot weather. What would cause the rails to buckle thermal expansion of the metal the tracks are made of could cause them to buckle in hot weather.
What does heat do to particles during a chemical reaction Heat breaks the original bonds between particles and creates new bonds during a chemical reaction
What is absolute zero (the values and the definition Absolute zero is 0°K, it is the point where molecules of a substance stop moving.
What happens to thermal energy when a substance changes state Thermal energy changes the temperature of the substance
Explain the difference between an insulator and conductor Insulators do not allow heat and electric current to flow easily - conductors allow the transfer of heat
What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in common contributed to The Atomic Theory
In Thomson’s “plum-pudding” model of the atom, the plums ¬represent which subatomic particle electrons
Which of the subatomic particle has the least mass Electrons
How did Democritus describe atoms Small, hard, indivisible
What is the smallest particle into which an element can be divided and still be the same substance atom
Which subatomic particle is negatively charged? Where is this particle located in the atom? Electrons. found in electron clouds
Which subatomic particle is positively charged? Where is this particle located in the atom? Protons. found in nucleus
Which subatomic particle has no charge? Where is this particle located in the atom? Neutrons found in nucleus
What do we call the dense center of the atom? nucleus
How do elements join to form compounds a specific recipe for each compound
What is a pure substance made of two or more elements that are chemically combined compound
How is a compound different from a mixture? Compounds are formed when two or more original substances lose their properties to chemically form a new substance
When elements form mixtures do the elements form a new substance or keep their original properties Elements in a mixture are not chemically combined so they keep their original properties
What type of change forms a compound Compounds must be combined by a chemical change
Created by: smileyk