Name __________________________
CHEM 1004
Test #1
Fall 2010 (Buckley)
1.
2.
(5 points) Identify each of the following as a chemical change or a physical change.
a.
A hydrogen-filled balloon is ignited in air to form water _____________________
b.
A puddle of water freezes to ice _________________________
c.
Propane is burned in a gas grill _________________________
d.
A chunk of metal is smashed with a hammer until it is flat _____________________
e.
An egg drops from 15 feet and is broken into pieces __________________________
(5 points) For each material listed in the left-hand column, place an “X” in the box that best classifies the
material. There will be one “X” per row.
Material
Pure Substance
Element Compound
Mixture
Homogeneous Heterogeneous
Sugar is dissolved in water
Tree bark
Table salt
Air
Salad dressing that has settled out
3.
4.
(5 points) Make the following conversions.
a.
135 mm = ________
m
b.
4.15 kg = __________ g
c.
20 m = __________ cm
d.
0.00045 kg = ________ mg
e.
85 cm = ____________ m
(4 points) A cube of metal has a side length of 4.75 cm and a mass of 500 g. What is its density in g/cm3 ?
Show your work.
5.
6.
(2 points) Circle the statement below that is NOT a part of John Dalton’s atomic theory.
a.
Matter is composed of indivisible particles called atoms.
b.
Isotopes of atoms differ in the number of neutrons in the nucleus.
c.
All atoms of an element are alike, but atoms of one element differ from atoms of another element.
d.
A chemical reaction involves a rearrangement of atoms – atoms are neither created nor destroyed.
e.
Compounds form when atoms of different elements combine in fixed proportions.
3
(5 points) Write the isotopic symbol (example, 1 H ) for each of the following situations.
a.
A nucleus of an element with 14 protons and a mass number of 30:
b.
A nucleus of Ge with 42 neutrons:
c.
A nucleus of an element with 44 protons and 60 neutrons:
d.
A nucleus of Ba with a mass number of 140:
e.
The isotope of carbon with 8 neutrons:
7.
(2 points) Write the electron configuration for Al.
8.
(4 points)
a. Write down the symbol and name (spelled correctly) for one element that is an alkali metal.
9.
b.
Write down the symbol and name (spelled correctly) for one element that is a transition metal.
c.
Write down the symbol and name (spelled correctly) for one element that is a halogen.
d.
Write down the symbol and name (spelled correctly) for one element that is in the third period.
(10 points) Write the formula for and the name of the compound formed between the following species.
Formula
Name
a.
Cs and N
_____________________
___________________________
b.
NH4+ and O
_____________________
___________________________
c.
Fe2+ and PO43-
_____________________
___________________________
d.
Sr and I
_____________________
___________________________
e.
Mg and SO42-
_____________________
___________________________
10. (5 points) Name the following compounds.
Name
a.
PF5
___________________________________
b.
SCl4
___________________________________
c.
N2O4
___________________________________
d.
ClO2
___________________________________
e.
SO3
___________________________________
11. (5 points) Write the formula for each of the following compounds.
Formula
a.
dinitrogen pentoxide
____________________________________
b.
copper (I) sulfide
____________________________________
c.
aluminum nitrate
____________________________________
d.
iron (III) hydroxide
____________________________________
e.
sulfur hexafluoride
____________________________________
12. (6 points) Draw the Lewis structure for each of the following. Be sure to include the lone pair electrons
(nonbonded pairs of electrons).
CHF3
HCN
PBr3