Chemistry NCFE 2018-19 #16-28

Front

What is the state of a substance at equilibrium when a boiling liquid is present?

Back

A boiling liquid is in equilibrium with its vapor.

Front

List three elements arranged according to increasing electronegativity values.

Back

N, O, F

Front

What effect does adding a catalyst have on a chemical reaction?

Back

A catalyst speeds up the reaction without being consumed.

Front

How do you calculate the temperature of a gas using the ideal gas law?

Back

Use the formula PV = nRT to find temperature (T).

Front

What is the approximate temperature of 1.4 moles of gas at 3.25 atm in a 4.738 L container?

Back

130 K

Front

What is the balanced equation for the reaction of zinc with hydrochloric acid?

Back

Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g)

Front

How do you determine the mass of hydrogen gas produced from a reaction?

Back

Use stoichiometry based on the balanced equation.

Front

What is the molar mass of hydrogen gas (H2)?

Back

2.02 g/mol

Front

What is the significance of electronegativity in chemical bonding?

Back

Electronegativity determines how atoms attract electrons in a bond.

Front

What is the definition of a catalyst?

Back

A substance that increases the rate of a chemical reaction without being consumed.