Unit 2 List 1 Chemistry Flashcards
(23 cards)
Atom
the basic unit of a chemical element.
Molecules
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
Substances
a particular kind of matter with uniform properties.
Homogenous Mixtures
a gaseous, liquid or solid mixture that has the same proportions of its components throughout a given sample.
Heterogenous Mixtures
a mixture in which the composition is not uniform throughout the mixture
Physical properties
a characteristic of a substance that can be observed or measured without changing the identity of the substance
Chemical properties
the characteristic ability of a substance to react to form new substances;
Isotopes
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
Elements
a part or aspect of something abstract, especially one that is essential or characteristic.
Compounds
a thing that is composed of two or more separate elements; a mixture.
Reaction
an action performed or a feeling experienced in response to a situation or event.
Products
an article or substance that is manufactured or refined for sale.
Hydrogen Bonds
a weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other.
Covalent Bonds
A chemical bond formed when electrons are shared between two atoms
ionic Bonds
the complete transfer of valence electron(s) between atoms.
Cation
a positively charged ion that is formed when a metallic element loses one or more electrons
Anion
an atom that has more electrons than protons
Periodic Table-Groups
a column in the periodic table of the chemical elements.
Periodic Table-Rows
Elements in the same row are in the same period.
Valence Electrons
The outermost shell or orbital of an atom
PH Scale
A measure of how acidic or basic a substance or solution is.
Acids
a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically, a corrosive or sour-tasting liquid of this kind.
Bases
the bottom support of anything; that on which a thing stands or rests
