Name
Period
Date
Mrs. Jimenez
APS
Practice for Mid-Term (APS)
*** Disclaimer – the practice questions below may represent SOME of the types of questions
that can be seen on the APS mid-term. It does NOT include every type of possible question or
topic. It is also only intended to help with free response preparation. The multiple choice will
touch on many things not represented here.
1) In the conductivity lab, you tested various concentrations (drop amounts) on the amount
of conductivity of NaCl.
Concentration was the
Conductivity was the
variable.
variable.
When graphing, independent variables should go on the
When graphing, dependent variables should go on the
axis.
axis.
2) What is 4,500 in scientific notation?
3) What is 0.006780 in scientific notation?
4)
a)
b)
c)
d)
Count how many significant figures are in the following measurements:
50.5 g
e) 24,500
2500 mL
f) 0.50
2.670 kg
g) 40.005
0.00056
h) 60.0
5) Convert 437.6 m to cm using the method of conversion factors. No proper method, no
credit.
6) Convert 78 kg to g using the method of conversion factors. No proper method, no credit.
7) Find the density of a solid piece of aluminum if it weighs 13.56 g and displaces 10.9 mL
of water. You must show all work including formula, substitution, units, etc. and you
also must solve to the correct number of significant digits.
8) A gas with a volume of 3.0 L at a pressure of 205kPa is allowed to expand to a volume of
11.5 L. What is the pressure in the container if the temperature remains constant? Also
name the gas law.
9) If a balloon contains 45mL of He gas at STP, what will the new volume of He gas be if
the balloon is heated to 215 deg C? Also name this gas law.
37
10) Given:
How many Protons?
Cl
Neutrons?
What is the atomic number?
-
Electrons?
Nucleons?
What is the mass number?
What is the atomic mass?
Is it a cation, anion, or neutral atom?
11) Give full electron configurations for…
V
I
12) Give Lewis Dot structures for:
Silicon
Strontium
13) Find the atomic mass of an unknown element if it has these 3 naturally occurring
isotopes: Isotope 1 has an atomic mass of 34.6 amu and relative abundance of 67.2%,
Isotope 2 has an atomic mass of 33.5 and relative abundance of 28.0 % and Isotope 3 has
an atomic mass of 36.0 and a relative abundance of 4.8 %.
14) Is MgCO3 an ionic or covalent compound?
15) Name the following:
a) Na3PO4
b) CH4
c) Mg(NO3)2
d) SO
e) P2F5
f) Li2O
16) Write formulas for the following:
a) Potassium Oxide
b) Disilicon tetroxide
c) Iron (III) Phosphide
This practice specifically does not include anything from the last unit (reactions and moles) since
we are just finishing it up now. It WILL however be represented on the mid-term