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Pre-Test
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1
Which of the following is not a subatomic particle?
A)Electron
B)Hydrogen
C)Proton
D)Neutron
E)All of the choices are subatomic particles.
2
Which of the following chemical bonds is formed from the equal sharing of electrons due to similar electronegativities?
A)Polar covalent
B)Non-polar covalent
C)van der Waals interactions
D)Ionic
E)Hydrogen
3
Which of the following statements about water is correct?
A)Ice floats on water because the H2O molecules in ice are spaced closer together and are therefore more dense than the H2 molecules in liquid water.
B)Water has a high heat of fusion, and a high heat of vaporization.
C)Water can be found as a solid, liquid, or gas, but is most commonly found on Earth as a gas.
D)Addition of solutes to water lowers its boiling point and increases its freezing point.
E)Water can act as a direct participant in some biological reactions.
4
Water is the universal solvent for chemical reactions in all living organisms.
A)True
B)False





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