Chem Keywords Flashcards
What is the atomic number of an element?
The number of protons in the nucleus of an atom.
What is the mass number of an element?
The total number of protons and neutrons in the nucleus of an atom.
What is an isotope?
Atoms of the same element with different numbers of neutrons.
What is an ion?
An atom with a net electric charge due to the loss or gain of electrons.
What is a covalent bond?
A chemical bond that involves the sharing of electron pairs between atoms.
What is an ionic bond?
A chemical bond that involves the transfer of electrons from one atom to another.
What is a metallic bond?
A chemical bond that occurs between metal atoms in a metallic structure.
What is a mole?
A unit of measurement used in chemistry to express amounts of a chemical substance.
What is Avogadro’s number?
The number of constituent particles (usually atoms or molecules) in one mole of a substance.
What is the law of conservation of mass?
Matter cannot be created or destroyed in a chemical reaction.
What is a catalyst?
A substance that increases the rate of a chemical reaction without being consumed in the process.
What is an exothermic reaction?
A reaction that releases heat to its surroundings. Causing the temperatures reaction to increase.
What is an endothermic reaction?
A reaction that absorbs heat from its surroundings. Causing the temperatures surrounding to decrease.
What is a pH scale?
A scale used to specify the acidity of an aqueous solution.
What is an acid?
A chemical which can neutralise bases, acids have a pH value less than 7 and contains H+ ions.
