Question 1
Two particles have the following composition:
i) 12 protons, 12 neutrons and 10 electrons and
ii) 11 protons, 12 neutrons and 10 electrons
They would be described as:
a) isotopes
b) positive ions (cations)
c) allotropes
d) negative ins (anions)
e) non-metal atoms
Question 2:
An atom with 8 electrons in its outer shell has a tendency:
a) to gain electrons
b) to lose electrons
c) neither gain nor lose electrons
d) to gain or to lose electrons
e) to gain protons
Question 3:
Consider each of the following materials. Classify them into three groups as elements, compounds or mixtures
a) sea water
b) soil
c) sulfur
d) steel
e) wine
f) titanium dioxide
Note: 1st and 2nd questions are multiple choice (one correct answer) Please tell me for the 3rd question which ones are compounds, which ones mentioned are elements and which ones are mixtures. Thankyou!
2007-02-22
16:52:55
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2 answers
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asked by
Anonymous
in
Chemistry