Student Name:_________________
Student Number:_______________
25.04.2006
Signature:______________
EAP Midterm Exam
1) __________ is anything that occupies space.
2) __________ refers to the parts and components of a sample of matter and their
relative proportions.
3) In a physical change, some of the physical properties of the sample may change, but its
composition________________.
4) A _______________is the ability or inability of a sample of matter to undergo a
change in composition under stated conditions.
5) Matter is made up of very tiny units called___________.
6) A chemical __________ is a substance made up of only a single type of atom.
7) Chemical ___________ are substances in which atoms of two or more different
elements are combined with one another.
8) A ____________ is the smallest entity having the same chemical composition as the
compound.
9) Elements and compounds are called____________.
10) ______________is a term used for mixtures that are uniform in composition and
properties throughout a given sample but variable from one sample to another.
11) In___________, the composition and physical properties vary from one part of the
mixture to another.
12) An _________depends on the quantity of the matter observed.
13) An _________is independent on the quantity of the matter observed.
14) _______is the number of parts of a constituent in 100 parts of the whole.
15) To some extent, measuring instruments have built-in, or inherent errors called
________ errors.
16) ________refers to the degree of reproducibility of a measured quantity.
17) ___________is stated as: the total mass of substances present after a chemical
reaction is the same as the total mass of substances before the reaction.
18) ________ is stated as: All samples of a compound have the same proportions by mass
of the constituent elements.
19) _________is stated as: If two elements are combined to form more than a single
compound, the masses of one element combined with a fixed mass of the second element
are in the ratio of small whole numbers.
20) Cathode rays subsequently became known as________.
21) ________ carry two fundamental units of positive charge and essentially have the
same mass as helium atoms.
22) _________ are negatively charged particles have the same properties as electrons.
23) Rutherford’s nuclear atom suggested the existence of positively charged fundamental
particles called_______.
24) The ________is defined as exactly 1/12 of the mass of the atom known as carbon-12.
25) The number of protons in an atom is called the__________.
26) The total number of protons and neutrons in an atom is called the ___________.
27) Atoms that have the same atomic number but different mass numbers are
called______.
28) The _______ of an element is the average of the isotopic masses.
29) A ________ is an amount of substance that contains the same number of elementary
entities as there carbon-12 atoms in exactly 12 g of carbon-12.
30) __________ is the number of elementary entities in a mole of substance.
31) A __________ is the symbolic representation that indicates the elements present in a
compound and their relative number of atoms.
32) An _____________ is the simplest formula for a compound.
33) A ___________shows the order in which atoms are bonded together in a molecule
and by what type of bonds.
34) An ______is made up of positive and negative ions joined together by electrostatic
forces of attraction.
35) The ______ of an ionic compound is the smallest electrically neutral collection of
ions.
36) ________ is the mass of a molecule in atomic mass units.
37) The ________ is the mass of one mole of compound.
38) The ________is related to the number of electrons that an atom gains, loses, or
otherwise appears to use in joining with other atoms in compounds.
39) _______ are those formed between two elements.
40) In_______, two or more atoms are joined together by covalent bonds.
1) polyatomic ions
2) intensive property
3) law of conservation of mass
4) substances
5) compounds
6) homogeneous mixture
7) protons
8) atomic number (Z)
9) isotopes
10) structural formula
11) mole
12) extensive property
13) avogardro’s constant
14) alpha particles
15) percent
16) law of definite proportions
17) molar mass
18) chemical formula
19)chemical property
20) atoms
21) systematic
22) beta particles
23) element
24) electrons
25) atomic mass unit
26) mass number (A)
27) atomic mass
28) matter
29)composition
30) remains unchanged
31) empirical formula
32) molecule
33) ionic compound
34) formula unit
35) oxidation number
36) law of multiple proportions
37) precision
38) binary compounds
39) molecular mass
40) heterogeneous mixtures