4. Fill in the blanks. Complete each sentence using a term from the word bank. (4)
Word Bank: element, compound, mechanical, mixture, solution homogeneous
mixture, heterogeneous mixture, metal, nonmetal, atom, molecule, atomic number,
mass number, pure substance, mixture, solute, solvent, proton, neutron
(a) A/an ________
is a pure substance, which is composed
of only one type of atom (e.g. O,, Cu, Pb) and cannot be broken down into
simple substances using chemical means.
(b) The _______
of a solution is the part that is present in greater
quantity
(c) A ______
solution describes a mixture in which the
components are uniformly distributed. There is only one phase, e.g.
Windex, glass cleaner.
(d) A ______
is a subatomic particle which carries a positive
charge.
(e) In general, _______
have the following physical properties: they
are lustrous, ductile, malleable and they docut electricity. Examples are
copper and silver.
(1) A _______
is an entity composed of two or more atoms held
together by covalent bonds. Examples are carbon dioxide and water.
(9) The _______
is the number of protons in the nucleus of
an atom. Each element has a different one.
is composed of more than one type of pure stance in
variable composition. Example: salt water.
(h) A ________
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