chemistry Flashcards
(20 cards)
What is an atom
The smallest “particle” of an element that retains the chemical identity of that element.
what is atomic mass
The average mass of one atom of an element.
what is atomic mass unit
A unit used to measure the mass of “particles” in atoms. Its size is approximately equal to the mass of a proton.
what is an atomic number
The number of protons in the nucleus of an atom.
what is the boiling point
The temperature at which a substance changes from a liquid to a gas (it is also pressure dependent).
what is Characteristic Property
Properties of matter, such as magnetic attraction, conductivity, density, boiling point, melting point and solubility, that can be used to identify substances. These properties do not vary with the amount of the substance.
what is a chemical bond
The force that holds two or more atoms together.
what is chemical change
A process in which substances undergo changes that result in new substances whose atoms have been exchanged or rearranged. It is typically hard to reverse this change. It is also referred to as a “chemical reaction.”
what is Chemical Energy
A form of potential energy that is stored in chemical bonds between atoms.
what is chemical equation
A concise way to represent the reactants and products in a chemical reaction using chemical formulas (2H2 + O2 🡪 2H2O). It is balanced if the number and type of atoms are equal on each side (reactants and products).
what is chemical formula
A combination of symbols that represents the elements in a molecule or compound and their proportions (H2O).
what is chemical property
A characteristic of a substance that describes its ability to change into a different substance and can’t be observed without altering the identity of the substance.
what is chemical symbol
A one or two letter representation of an element (for example, Na, H, C, etc.). The first letter is always capitalized (if there is one, the second letter is not).
what is chemistry
The study of the composition and properties of matter and how it changes.
what is a coefficient
A number in front of a chemical formula in a chemical equation that indicates how many molecules or atoms of each reactant are involved in the reaction (2H2O).
what is combustion
A type of chemical reaction in which a fuel combines with oxygen to produce heat, light, CO2 (carbon dioxide), and H2O (water).
what is a compound
A substance made from two or more elements chemically combined (NaCl).
what is Covalent Bond
A chemical bond resulting from the sharing of electrons between the bonding atoms.
what is Decomposition
A type of chemical reaction in which a single complex compound is broken down into two or more products (AB 🡪 A + B).
