Q1
Atom
Answer: The smallest unit of elements, made up of electrons surrounding the nucleus
of protons and neutrons.
Q2
element
Answer: A pure chemical substance made up of only one type of atom. It cannot be
broken down into simpler substances, by normal scientific methods.
Q3
symbols
Answer: A shorthand notation for elements, made up of one or two letters from the
element's name.
Q4
molecule
Answer: A group of two or more atoms that are covalently bonded together.
Q5
diatomic molecule
Answer: A molecule composed of two atoms bonded together.
Q6
compound
Answer: A substance made up of two or more elements chemically joined together.
Q7
molecular formula
Answer: Expresses how many atoms of each element that are in a chemical compound.
, Q8
pure substances
Answer: A substance entirely composed of identical particles. An element is composed
of identical atoms, while a compound is composed of identical molecules.
Q9
mixtures
Answer: Two or more pure substances that are mixed together, and not chemically
bonded.
Q10
homogenous mixture
Answer: A mixture that has a uniform composition.
Q11
heterogeneous mixture
Answer: A mixture in which the different ingredients are identifiable.
Q12
colloids
Answer: A mixture in which one substance made up of very small particles is dispersed
throughout another substance.
Q13
Tyndall effect
Answer: Light will not be dispersed when passing through a liquid or solution, but it
will be dispersed by the particles suspended in a colloid or suspension.
Q14
suspension
Answer: A heterogeneous mixture, that differs from a solution in that it contains
particles that are not permanently suspended, and will eventually settle out of.