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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