UNIT 5 - PARALLEL EXAM MATTER AND ENERGY

Give an example (using symbols) of an element, compound, and homogeneous mixture. Which can be separated physically and which cannot be decomposed?

How would you describe a solution composed of 100 g of water, 10 grams of potassium chlorate at 40 o C? What could be done with 6 more grams of potassium chlorate? Initial solution is unsaturated, dissolving 6 more grams may saturate the solution.

What kind of reactions are these (type and based on energy involved). 2C(s) + 3H 2 (g)  C 2 H kJ H 2 (g) + I 2 (g) + 53 kJ  2HI(g)

If 15 grams of water at 3 o C absorbs 450 J of heat, the temperature of the water will change by J = 15 g (4.18 J / g °C ) X X = 7.2 o C

Convert 4500 mJ to dJ 4500 mJ.001 J1dJ 1 mJ0.1 J 45 dJ

Which of the following substances is made of particles with the lowest average kinetic energy? a) 5 g of barium at 22 o C b) 22 g of calcium at 5 o C

Which would take more energy? a) Melt 90 g of ice at 0 o C b) Vaporize 20 g of water at 100 o C a) (90 g)(334 g/J)= J b) (20 g)(2260 g/J)= J

A gas has a volume of 870 mL at a temperature of 30 K and a pressure of 2 atm. What will be the volume when the temperature is changed to 60 K and the pressure is changed to 3.5 atm? 994 mL

Under which conditions does a real gas behave most like an ideal gas. Ideal gases are like ideal relationships: “hot with no pressure”

How could one increase vapor pressure? Furthermore, what occurs if this exceeds atmospheric pressure? Heat the liquid and it may begin to boil.

Correctly read a heating/cooling curve.

What is the concentration in ppm if.050 g of NaI are placed in 325 dg of solution? 15.3 ppm

U5 Most Challenging Questions a)A 0.5 gram sample of H 2 contains approximately the same number of molecules as... b)The mass of one mole of iodine molecules at STP is.... c)The functional group of an aldehyde or amino acid