Chemistry - June 2011

41 Which diagram represents a physical change, only?

42 During a laboratory activity to investigate reaction rate, a student reacts 1.0-gram samples of solid zinc with 10.0-milliliter samples of HCl(aq). The table below shows information about the variables in five experiments the student performed.

Which two experiments can be used to investigate the effect of the concentration of HCl(aq) on the reaction rate?

(1) 1 and 3    (3) 4 and 2
(2) 1 and 5    (4) 4 and 3

43 Which temperature change would cause a sample of an ideal gas to double in volume while the pressure is held constant?

(1) from 400. K to 200. K
(2) from 200. K to 400. K
(3) from 400.C to 200.C
(4) from 200.C to 400.C

44 A 36-gram sample of water has an initial temperature of 22C. After the sample absorbs 1200 joules of heat energy, the final temperature of the sample is

(1) 8.0C   (3) 30.C
(2) 14C    (4) 55C

 Previous Page Next Page




EduSolution -
Helping Students
to succeed!
Vistors' Comments

This is one of the absolute best sites I've found online, and I say that as a teacher who has spent countless hours looking for kid-friendly material on the net. I have no idea how you found the time and energy to put it together, but you have my admiration! - Andrew Cowells, Concord Jr. High