SAT Chemistry Practice Exam 1

Part B

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101.

NH3 is a nonpolar molecule

BECAUSE

For nonpolar molecules charge is symmetrically distributed

102.

0.01M NaOH has a pH of 12

BECAUSE

NaOH is an ionic compound

103.

The bond between C and Br is polar

BECAUSE

CBr4 molecule has a tetrahedral shape

104.

The rate of effusion of hydrogen gas is four times that of oxygen gas

BECAUSE

The rate of effusion is inversely proportional to the square root of molar mass

105.

The radius of Na+ is smaller than Na

BECAUSE

Na+ is a cation

106.

Al(OH)3 is a strong base

BECAUSE

Strong bases dissociate in water completely

107.

The reaction between HNO3 and NH3 produces a basic salt

BECAUSE

All neutralization reactions produce water and salt

108.

1 liter of Neon gas and xenon gas have the same number of molecules at STP

BECAUSE

Neon has a higher first ionization energy than xenon

109.

Solids and liquids are not a part of the equilibrium expression

BECAUSE

The concentrations of pure solids and pure liquids does not change during the reaction.

110.

A saturated sugar solution is at equilibrium

BECAUSE

The rate of sugar dissolving is equal to the rate of sugar precipitating

111.

Both atoms of Helium gas and Argon gas at 25C have the same average kinetic energy

BECAUSE

Temperature is the measure of the average kinetic energy

112.

The vapor pressure of pure water is lower than that of 1M NaCl solution

BECAUSE

Water has hydrogen bonding

113.

filtration will allow for the separation of MgI2 from water

BECAUSE

The mixture of MgI2 and water is homogeneous

114.

When an electron goes from n=3 to the ground state, it releases energy

BECAUSE

N quantum number represents the principal energy level

115.

2g of CH4 and 2g of C2H8 have the same % mass of carbon

BECAUSE

Both CH4 and C2H8 are organic molecules