Chemistry NCFE 2018-19 #16-28

Front

What is equilibrium in the context of a boiling liquid and its vapor?

Back

A boiling liquid is in equilibrium with its vapor when the rate of vaporization equals the rate of condensation.

Front

List the elements in order of increasing electronegativity: N, O, F.

Back

N < O < F

Front

What is the trend in atomic radii across a period in the periodic table?

Back

Atomic radii decrease from left to right across a period due to increasing nuclear charge.

Front

What is the coefficient of CaBr2 when balancing the equation CaSO4 + AlBr3 → CaBr2 + Al2(SO4)3?

Back

3

Front

Describe the equilibrium between liquid water and water vapor.

Back

The rate of vaporization equals the rate of condensation.

Front

What is electronegativity?

Back

Electronegativity is the tendency of an atom to attract electrons in a chemical bond.

Front

What happens to atomic radii as you move down a group in the periodic table?

Back

Atomic radii increase as you move down a group due to the addition of electron shells.

Front

Define sublimation.

Back

Sublimation is the process where a solid changes directly into a gas without passing through the liquid phase.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the law of conservation of mass is obeyed, meaning the number of atoms of each element is the same on both sides.

Front

What is the relationship between vapor pressure and temperature?

Back

As temperature increases, vapor pressure increases because more molecules have enough energy to escape into the vapor phase.