June 2004 Regents #1-10
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|1 The modern model of the
atom is based on the work of
|2 Which statement is true about the charges assigned to an
electron and a proton?
|3 In the wave-mechanical model, an orbital is a region of
an atom where there is
|1||definition- electrons travel in waves and we we have an idea where the electron is found using probability|
|4 What is the charge of the nucleus in an atom of
|3||nuclear charge = # protons= +8|
|5 Which pair of symbols represents a metalloid and a noble
|2||metalloids found on staircase and Noble Gases are group 18|
|6 Which statement describes
a chemical property of iron?
|3||chemical property refers to a reaction|
|2||use the coefficients which is 1 to 3|
|8 What is the percent by mass of oxygen in propanal, CH3CH2CHO?
|2||gram formula mass= 3(12)+6(1)+16=58
(16/58) * 100%= 27.6%
|9 Covalent bonds are formed when electrons are
|4||Covalent shared electrons
|10 Which type of molecule is CF4?
CF4 is Symmetrical is Nonpolar
Asymmetrical is Polar
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