CHEM1001 Worksheet 1 – Answers to Critical Thinking Questions
The worksheets are available in the tutorials and form an integral part of the learning outcomes and experience
for this unit.
Model 1: Matter
1.
- Compound – carbon dioxide composed of 2 elements, oxygen and carbon in strict ratios.
- Compound – composed of sodium and chlorine ions, in 1:1 ratio.
- Mixture – composed of lots of different elements and compounds, eg, salt, water, metals, etc
- Element – it cannot be decomposed into anything else
- Mixture – metals such as tin, silver, brass etc in varying compositions.
- Mixture – water, salt, carrots!
- Element – it cannot be decomposed into anything else
Model 2: Getting to know The Periodic Table
1.
Tin, hydrogen, lead, carbon, silicon, gold
2.
N, Cu, W, As, Ne, Na
3.
Bohrium (after Niels Bohr), copernicium (after Nicolaus Copernicus), curium (after Pierre and Marie
Curie), einsteinium (after Albert Einstein), fermium (after Enrico Fermi), gadolinium (after Johan
Gadolin), lawrencium (after Ernest Lawrence), meitnerium (after Lise Meitner), mendelevium (after
Dmitri Mendeleev), nobelium (after Alfred Nobel), roentgenium (after Wilhelm Roentgen),
rutherfordium (after Ernest Rutherford), samarium (after Vasili Samarsky-Bykhovets) and
seaborgium (after Glenn T. Seaborg)
4.
Americium (America), berkelium (Berkeley, California, US), californium (California, US), copper
(probably from Cyprus), darmstadtium (Darmstadt, Germany), dubnium (Dubna, Russia), erbium
(Ytterby, Sweden*), europium (Europe), francium (France), gallium (Gaul [France]), germanium (
Germany), hafnium (Hafnia, Copenhagen), hassium (Hassia [Hesse in Germany]), holmium (Holmia,
[Stockholm in Sweden]), lutetium (Lutetia [Paris, France]), magnesium (Magnesia Prefecture, Thessaly,
Greece), polonium (Poland), rhenium (Rhenus [Rhine, Germany]), ruthenium (Ruthenia [Russia,
Ukraine and Belarus]), scandium (Scandinavia), strontium (Strontian, Scotland), terbium (Ytterby,
Sweden*), thulium (Thule, a mythical island), ytterbium (Ytterby, Sweden*), yttrium (Ytterby,
Sweden*).
5.
Helium (after Helios), selenium (after Selene), niobium (after Niobe), palladium (after Pallas Athena),
cadmium (after Cadmus), tantalum (after Tantalus), iridium (after Iris), mercury (after Mercury), cerium
(after Ceres), promethium (after Prometheus), europium (after Europa), thorium (after Thor), uranium
(after Uranus) and plutonium (after Pluto)
*
Note that there are 4 elements named after the Swedish village of Ytterby
Exercise
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
Mn
Zn
Bi
Ni
Cu
Ba
Ar
Ne
Hg
Si
P
I
Sn
Pb
Sb
Se
Kr
Ag
Fe
S
Cd
As
B
Ca
Rn
At
Sm
Co
Eu
Cs