Chem 151 Exam 1 Questions With Correct
Answers
What are chemists' three central goals and what kind of questions
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should be asked? - CORRECT ANSWER✔✔-Analysis- What is this?
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Synthesis- How do I make it? | | | | |
Modeling- How do I explain it? | | | | |
intensive property - CORRECT ANSWER✔✔-DO NOT depend on the
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amount of material | |
Melting point, boiling point, density, color
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CHARACTERISTIC
of a material
| |
extensive property - CORRECT ANSWER✔✔-Depend on the amount of
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material
Length, Mass, Area | |
Independent of the type or identity of the material
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Tell you HOW MUCH
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,quantitative - CORRECT ANSWER✔✔-any value recorded directly from a
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tool is considered quantitative data (numbers based)
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qualitative - CORRECT ANSWER✔✔-It includes such descriptions as
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color as well as observations about texture changes and anything else
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that is actually an opinion (try describing the difference in color
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between two different blades of grass)
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significant figures rules - CORRECT ANSWER✔✔-1. Zeroes in the
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beginning of a number never count.
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2. Zeroes at the end of a number count only if there is a written decimal
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point.
3. The digits 1 - 9 always count.
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4. Zeroes between the digits 1 - 9 always count.
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matter - CORRECT ANSWER✔✔-anything that has mass and occupies
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space
substance - CORRECT ANSWER✔✔-that object which has mass and
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occupies space |
composition - CORRECT ANSWER✔✔-the makeup of something
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(components)
, state - CORRECT ANSWER✔✔-its physical form/condition
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three states of matter - CORRECT ANSWER✔✔-gas, liquid, solid
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solid - CORRECT ANSWER✔✔--atoms or molecules pack close to each
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other in fixed locations| | |
-vibrate but do not move around or past each other
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-fixed volume and shape | | |
crystalline - CORRECT ANSWER✔✔-case in solid state where atoms or
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molecules are in patterns with long-range, repeating order ex) salt and
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diamond
amorphous - CORRECT ANSWER✔✔-case where a solid's atoms or
| | | | | | | | |
molecules do not have any long-range order. ex.) glass and plastic
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liquid - CORRECT ANSWER✔✔-atoms or molecules pack about as
| | | | | | | | |
closely as they do in solid matter however they are free to move relative
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|to each other, giving liquids a fixed volume but not a fixed shape.
| | | | | | | | | | | |
-assume shape of container | | |
gas - CORRECT ANSWER✔✔-atoms have a lot of space between them
| | | | | | | | | | |
and are free to move relative to one another making gases compressible
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Answers
What are chemists' three central goals and what kind of questions
| | | | | | | | | | |
should be asked? - CORRECT ANSWER✔✔-Analysis- What is this?
| | | | | | | |
Synthesis- How do I make it? | | | | |
Modeling- How do I explain it? | | | | |
intensive property - CORRECT ANSWER✔✔-DO NOT depend on the
| | | | | | | | |
amount of material | |
Melting point, boiling point, density, color
| | | | |
CHARACTERISTIC
of a material
| |
extensive property - CORRECT ANSWER✔✔-Depend on the amount of
| | | | | | | | |
material
Length, Mass, Area | |
Independent of the type or identity of the material
| | | | | | | |
Tell you HOW MUCH
| | |
,quantitative - CORRECT ANSWER✔✔-any value recorded directly from a
| | | | | | | | |
tool is considered quantitative data (numbers based)
| | | | | |
qualitative - CORRECT ANSWER✔✔-It includes such descriptions as
| | | | | | | |
color as well as observations about texture changes and anything else
| | | | | | | | | | |
that is actually an opinion (try describing the difference in color
| | | | | | | | | | |
between two different blades of grass)
| | | | |
significant figures rules - CORRECT ANSWER✔✔-1. Zeroes in the
| | | | | | | | |
beginning of a number never count.
| | | | |
2. Zeroes at the end of a number count only if there is a written decimal
| | | | | | | | | | | | | | | |
point.
3. The digits 1 - 9 always count.
| | | | | | |
4. Zeroes between the digits 1 - 9 always count.
| | | | | | | | |
matter - CORRECT ANSWER✔✔-anything that has mass and occupies
| | | | | | | | |
space
substance - CORRECT ANSWER✔✔-that object which has mass and
| | | | | | | | |
occupies space |
composition - CORRECT ANSWER✔✔-the makeup of something
| | | | | | |
(components)
, state - CORRECT ANSWER✔✔-its physical form/condition
| | | | |
three states of matter - CORRECT ANSWER✔✔-gas, liquid, solid
| | | | | | | |
solid - CORRECT ANSWER✔✔--atoms or molecules pack close to each
| | | | | | | | | |
other in fixed locations| | |
-vibrate but do not move around or past each other
| | | | | | | | |
-fixed volume and shape | | |
crystalline - CORRECT ANSWER✔✔-case in solid state where atoms or
| | | | | | | | | |
molecules are in patterns with long-range, repeating order ex) salt and
| | | | | | | | | | |
diamond
amorphous - CORRECT ANSWER✔✔-case where a solid's atoms or
| | | | | | | | |
molecules do not have any long-range order. ex.) glass and plastic
| | | | | | | | | |
liquid - CORRECT ANSWER✔✔-atoms or molecules pack about as
| | | | | | | | |
closely as they do in solid matter however they are free to move relative
| | | | | | | | | | | | |
|to each other, giving liquids a fixed volume but not a fixed shape.
| | | | | | | | | | | |
-assume shape of container | | |
gas - CORRECT ANSWER✔✔-atoms have a lot of space between them
| | | | | | | | | | |
and are free to move relative to one another making gases compressible
| | | | | | | | | | |
