Which of the following reactions would be expected to have the highest entropy change?
Liquid → Gas
Solid → Liquid
Gas → Liquid
Gas → Solid
Correct answer is A
The phase change from a liquid to a gas involves an increase in entropy. In the gas phase, molecules have higher degrees of freedom and are more dispersed compared to the liquid phase, resulting in higher entropy change.
Which noble gas is radioactive and is produced as a decay product of uranium and thorium?
Argon
Krypton
Radon
Neon
Correct answer is C
Radon is a radioactive noble gas and is produced as a decay product of uranium and thorium in the Earth's crust. It is colorless, odorless, and tasteless, making it potentially hazardous when it accumulates in enclosed spaces.
The position of equilibrium shifts to the left
The position of equilibrium shifts to the right.
The position of equilibrium remains unchanged
The reaction stops
Correct answer is B
When the temperature is decreased in a reversible reaction, the equilibrium shifts in the direction that produces heat (exothermic direction). For an exothermic reaction, this means the equilibrium position shifts to the right, favoring the forward reaction.
Hard water is water with high concentrations of dissolved ions, in particular calcium and
magnesium ions
nitrogen ions
phosporus ions
helium ions
Correct answer is A
Hard water is water with high concentrations of dissolved ions, in particular calcium and magnesium ions
N655 credit
N655 debit
N130 credit
N130 debit
Correct answer is B
No explanation has been provided for this answer.