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WorksheetsQuestionnaire 5 Chem (9th)
Total questions: 22
Worksheet time: 13mins
The scientific method is NOT based on the observation of the natural world
True
False
The scientific method is divided in two parts
analysis / synthesis
induction / deduction
None of the above
Deduction involves
making generalization from particular observations
reasoning from generalizations to predict the result in a particular case
None of the above
Hypothesis is a proposed explanation of a natural phenomenom
True
False
A hypothesis that is able to predict accurately a natural phenomenom, becomes a THEORY
True
False
Induction involves
Taking ideas or principles and turn them into empirical evidence
Taking empirical evidence and turn it into ideas or principles
none of the above
Explain why chemistry is a newer science compare to mathematics
Only in the 18th century there was enough technology to prove that the atom actually existed. This was done by John Dalton
True
False
There are 93 natural atoms. The whole universe is constructed by the combination of these 93 atoms
True
False
What are the subatomic particles?
Proton, neutron
Proton, neutron, electron
Nucleus, envelope
Protons are
negatively charged
positively charged
Neutral
Electrons are
negatively charged
positively charged
neutral
Neutrons are
negatively charged
positively charged
neutral
An electron is .......... smaller than a proton
10 000 times
50 000 times
5 000 times
The atomic weight considers the weight of
protons only
protons and neutrons
protons, neutron and electrons
Between the nucleus and electrons there is
some air
a huge void
more electrons
What is the atomic number?
The number of protons in the nucleus.
It is the overall mass of an atom.
None of the above
It is possible to have two different elements with the same atomic number.
True
False
As a general rule, in atoms
the number of protons equals the number of electrons
the number of protons is greater than the number of electrons
None of the above
Ions are charged particles (positively and negatively) formed when electrons are lost or gained in an atom.
True
False
Isotopes are
different atoms of the same element with different mass numbers
atoms whose number of protons is greater than the number of electrons
different atoms of the same element with different atomic numbers
Choose the correct one
Cations are a positively charged ions formed when an atom losses electrons
Cations are a negatively charged ions formed when an atom losses electrons
None of the above
