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Science Ch.1-Matter

QuestionAnswer
Anything that has mass and takes up space. Matter
Can matter change properties? YES! Water, for example, is a clear liquid at room temperature. At cold temperatures,however, water exists in its solid form. And at high temperatures, water exists in the form of water vapor, which is an invisible gas.
List the three principal states of matter. Solids, liquids, and gasses.
The quality of a substance that never changes and can be used to identify the substance. Characteristic Property
True or False. Since characteristic properties for a given substance always change, they can be used to identify unknown matter. FALSE! Since characteristic properties for a given substance NEVER change, they can be used to identify unknown matter.
True or False. The temperature for boiling point if always 100 degrees celcius. Fasle! The temperature for boiling point DIFFERS DEPENDING ON THE OBJECT.
The tempersture at which a liquid boils. Boiling Point
True or false. Boiling point is a characteristic property. True!
The temperature at which solids melt. Melting Point
True or false. Melting point is a characteristic property. True!
A change in a substance taht does not change its idenity; for example, a change of state. Physical Change
When substancescombine or break apart to form new substances. Chemical Change
The ability of a substance to undergo a specific chemical change. Chemical Activity
List the two general categories that matter can be classified. Mixtures and pure substances
What do pure substances include? Elements and compounds.
Consists of two or more substances that are in the same place but are not chemically combined. Mixture
The "best mixed" of all possible mixtures. Solutions
Made of only one kind of matter and has definite properties. Pure Substances
cannot be broken down into other substances. Element
A substance that is made of two or more elements that are chemically combined. Compound
The measure of the force of gravity on you. Weight
True or false. Much like weight, an object's mass will not change if the force of gravity on it changes. False! Unlike weight, an object's mass will not change if the force of gravity on it changes.
A system of units that scientists use to measure the properties of matter. International System of Units
What is the abbreviation for the International System of Units? SI
The amount of space that matter occupies. Volume
For rectangular objescts, how do you find the volume? Volume = Length x Width x Height
The measurement of how much mass of a substance is contained in a given volume. Density
How do you calculate density? Density = Mass/Volume
The smallest part of an element. Atom
A Greek philosopher who lived about 440 B.C. Democrutis
What does the word "atomos" mean? It is Greek for "uncuttable."
Proposed an atomic theory on 1802. Also a British schoolteacher. John Dalton
True or false. Dalton believed that atoms cannot be broken into smaller pieces. He Thought atoms were like tiny mrbles, or rigid spheres that are impossible to break. True!
True or false. Dalton believed that In every element atoms are never the same. Just like snowflakes. This idea explains why an element always have different properties. False! In any element, atoms are exactly ALIKE. his idea explains why an always has the SAME properties.
True or false. Dalton believed that Atoms of different elements are different. Thus idea explains why different elements have their own set of properties. True!
True or false. Dalton believed that atoms of a minimum of four or more elements can combine to form compounds. Compounds cannot be broken down into elements, so Dalton concluded that compounds had to be made of atoms as well. False! Atoms of two or more elements can combine to form compounds. Compounds CAN be broken down into elements, so Dalton concluded that compounds had to be made of atom as well.
True or false. Dalton believed that Atoms of each element have an alike mass. However, Dalton and other scientists of his day were not actually able to measure tha mass of indivual atoms. False! Atoms of each element have a unique mass. However, Dalton and other scientists of his day were not able to measure the mass of indivual atoms.
True or false. Dalton believed that The masses of the elements in a compound are always in a constant ratio.Water example, is a compound composed of hydrogen atoms and oxygen atoms. True!
True or false. Scientists have yet to identify some important exceptions to Dalton's statements. False! Today, scientists have identified some important exceptions to dalton's statements. Even so, dalston's ideas for the basis of our understanding of atoms.
A group of atoms that are joined together and act as a single unit. Molecule
The force that holds two atoms together. Chemical Bond
What do scientists use to see atoms? A scanning tunnelling microscope
True or false. Gold is the only element that cannot be seperated from other materials in a mixture because of its density. False! Gold CAN be seperated from other materials in a mixture because of its density.
Any rock that contains a metal or other economically useful material. An Ore
True or false. to obtain an element from its compound, it unnecessary to cause a chemical reaction to take place. False! To obtain an element from its compound, it is necessary to cause a chemical reaction to take place.
what do today's miners use to "fish out" the gold? Machines called dredges
The process by which an electric current breaks chemical bonds. Electrolysis
A metal strip that conducts electricity; often used in an electrolysis process. Electrode
Created by: tayloremmasam