Chem 101 test
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Chem 101 test
The study of matter and the changes it undergoes.
The practical application of knowledge.
An accumulation of knowledge about nature and our physical world based on observations and experimental tests of our assumptions.
A tentative explanation of observations.
The best current explanation for a phenomenon.
A brief statement that summarizes large amounts of data.
Uses tangible items or pictures to represent invisible processes and help explain complex phenomena.
Things that can change during an experiment.
Make particular kinds of products useful.
Obtain new knowledge or to answer fundamental questions.
Anything that has mass and takes up space.
A measure of the amount of matter in an object.
Represents the gravitational force of attraction for an object
Matter can be observered without making new substances or changing its composition.
: temp, mass, boiling
New substances are formed when observed and has a change in composition.
: rusty, burn, explode
A change in appearance of matter without changing its chemical identity or composition.
: Melting ice, hair cut
A change in the chemical identity of matter into other substances that are chemically different.
: Iron rusts, lemon juice converts milk to curds.
States of Matter
Solid- had definite shape and volume
Liquid- has definite volume, but takes shape of container.
Gas- takes both shape and volume of container.
Has a definite compostion that does not vary from sample to next.
: pure gold, pure water
May have many different compositions depending on how its prepared.
Composed of all the same atoms.
Smallest particle of an element.
Made up of two or more elements, chemically combined in fixed proportions.
Groups of atoms bonded together as one unit.
The ability to change matter physically or chemically.
Potential Energy- stored energy
Kinetic Energy- energy in motion
Energy flow from a hot object to a cold one.
Measure of how hot or cold an object is.
"how heavy something is for its size"
The amount of heat required to change temp of 1g of water by 1*c