Chemistry NCFE 2018-19 #16-28

Front

What is electronegativity?

Back

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. It is a key concept in understanding chemical bonding and reactivity.

Front

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

Back

The order of increasing electronegativity is: N < O < F.

Front

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

Back

Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g) is the balanced equation for the reaction.

Front

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

Back

Use stoichiometry based on the balanced equation and the molar mass of the reactants and products.

Front

What is the atomic radius?

Back

The atomic radius is the distance from the nucleus of an atom to the outermost shell of electrons.

Front

List the elements in order of increasing atomic radii: O, S, Se, Te.

Back

The order of increasing atomic radii is: O < S < Se < Te.

Front

What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products.

Front

What does it mean to balance a chemical equation?

Back

Balancing a chemical equation means ensuring that the number of atoms for each element is the same on both sides of the equation.

Front

What is the significance of coefficients in a balanced equation?

Back

Coefficients indicate the relative amounts of reactants and products involved in a chemical reaction.

Front

What happens during the decomposition of sodium bicarbonate (NaHCO3)?

Back

Decomposition of NaHCO3 produces carbon dioxide (CO2) and water (H2O) when heated.