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2000
Matter, Change, and Energy
2


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Questionario a risposta multipla
1- The ionization potential of an atom is defined as:
the energy produced after the acquisition of an electron
a measure of the tendency to attract an electron
the energy required to remove an electron
a measure of the capacity to irradiate energy
2- Electron affinity is the name given to the energy that occurs when
an electron is removed from a gaseous atom or ion.
an electron is added to a gaseous atom or ion.
an electron is shared with a gaseous atom or ion.
a neutron is removed from a gaseous atom or ion.
a neutron is added to a gaseous atom or ion.
3- How can an atom achieve a lower-energy state?
metals atoms can gain electrons
non-metals atoms can lose electrons
it can become isoelectronic with the nearest noble gas
it can have completely filled s orbitals
4- Fluorine forms the most stable ion when it
loses one electron
gains one electron
has the same electron configuration as helium
answers a and c are both correct
none of the above
5- An atom is the smallest particle of 
a compound
an element
a reactant
an electron
6- Pick the two words which most closely related
symbol; equation
symbol; compound
formula; reaction
formula; compound
equation; element
7- What do evaporation and boiling have in common?
Both require a high temperature to occur
Both form a gas
Only surface molecules escape in both
Both require a high temperature to occur and only surface molecules escape in both
8- Which of the following processes is a physical change?
Evaporation-.
Salification.
Combustion.
Electrolysis.
9- A chemical change...
always modifies the composition of pure substances.-
often modifies the composition of pure substances.
never modifies the composition of pure substances.
modifies only the composition of pure elements.
10- A suspension is a mixture of ...
gaseous molecules dispersed in a liquid.
solid particules suspended in a liquid.-
two gases.
equal quantities of two liquids.



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