Chemistry Ch 1 Vocab Flashcards
(20 cards)
Scientific Method
The observation, explanation, and testing of an explanation by additional experiments.
Scientific Law
Broad generalization, based on results of many experiments. Offers no explanation.
Hypothesis
A tentative explanation of the results of experiments.
Data
The information (often in the form of physical quantities) obtained in an experiment or other experience or from references.
Theory
A tested explanation of the results of many experiments. Cannot be proven absolutely correct.
Atom
A neutral particle having one nucleus; the smallest representative sample of an element.
Molecule
A neutral particle composed of two or more atoms combined in a definite ratio of whole numbers.
Matter
Anything that has mass and occupies space.
Mass
A measure of the amount of matter that there is in a given sample.
Weight
The force with which something is attracted to the earth by gravity.
Compound
A substance consisting of chemically combined atoms from two or more elements and present in a definite ratio.
Mixture
Any matter consisting of two or more substances physically combined in no particular proportion by mass.
Homogeneous Mixture
A mixture that has only one phase and that has uniform properties throughout; a solution.
Heterogeneous Mixture
A mixture that has two or more phases with different properties.
Solution
A homogeneous mixture in which all particles are of the size of atoms, small molecules, or small ions.
Physical Property
A property that can be specified without reference to another substance and that can be measured without causing a chemical change.
Physical Change
A change that is not accompanied by a change in chemical makeup.
Chemical Reaction
A change in which new substances (products) form from starting materials (reactants).
Chemical Property
The ability of a substance, either by itself or with other substances, to undergo a change into new substances.
Chemical Change
A change that converts substances into other substances; a chemical reaction.
