some more chemistry questions:?

1. when solutions of KCl & pb(NO3)2 are mixed, a precipitate forms. Which of the following is the balanced equation for the double replacement reaction that occurs?

A) K(aq) + NO3 (aq) --> KNO3 (aq)

B) KCl (aq) + Pb(NO3)2 (aq) --> KNO3 + PbCl (s)

C) KNO3 (aq) + PbCl2 (s) --> KCl (aq) + Pb(NO3)2 (aq)

D) 2KCl (aq) + Pb(NO3)2 (aq) --> 2KNO3 (aq) + PbCl2 (s)

E) KCl(aq) + Pb(NO3) (aq) --> KNO3(aq) + PbCl2(s)

2. what is the concentration, in m/m% of a solution prepared drom 50.0g NaCl and 150.0g of water?

A) 33.3%

B) 0.250%

C) 40.0%

D) 25.0%

E) 3.00%

*PLEASE SHOW WORK

3. Rubbing alcohol is 70% isopropyl alcohol by volume. How many mL of isopropyl alcohol arwe in a 1 pint (473 mL) container?

A) 0.15 mL

B) 70. mL

C) 330 mL

D) 470 mL

E) 680 mL

*PLEASE SHOW WORK

4. A(n)_____ is a type of colloid in which a liquid is dispersed in another liquid or a solid.

A) suspension

B) sol

C) aerosol

D) emulsion

E) foam