Questions

Explanations

41 Which elements can react to produce a molecular compound?

(1) calcium and chlorine

(2) hydrogen and sulfur

(3) lithium and fluorine

(4) magnesium and oxygen

covalent is 2 nonmetals

42 Compared to a 10-mole sample of NaCl(s), a 10-mole sample of NaCl(l) has a different

(1) number of ions

(2) empirical formula

(3) gram-formula mass

(4) electrical conductivity

solids have ions that can't move

43 Which property of an unsaturated solution of sodium chloride in water remains the same when more water is added to the solution?

(1) density of the solution

(2) boiling point of the solution

(3) mass of sodium chloride in the solution

(4) percent by mass of water in the solution

44 Which ion combines with Ba²⁺ to form a compound that is most soluble in water?

(1) S^2- (2) OH^-  (3)  CO₃^2-  (4)  SO₄^2-

45 When a sample of gas is cooled in a sealed, rigid container, the pressure the gas exerts on the walls of the container will decrease because the gas particles hit the walls of the container

(1) less often and with less force

(2) less often and with more force

(3) more often and with less force

(4) more often and with more force