6.
A rigid container of O2 has a pressure of 340 kPa at a temperature of 713 K. What is the pressure at 273 K?
7.
A gas storage tank has a volume of 3.5 X 105 L when the temperature is 27oC, and the pressure is 101 kPa.
What is the new volume of the tank if the temperature drops to -10oC and the pressure drops to 95 kPa?
8.
What is the pressure exerted by 44 grams of CO2 in a 26.0 L container at 28oC?
9.
A sample of argon gas is at a pressure of 1.24 X 104 kPa and a temperature of 24oC in a rigid 25 liter tank.
How many moles of argon does this tank contain?
Draw graphs that describe following scenarios:
1.
A dented ping pong ball fixes when you heat it
2.
A propane tank sitting in the sun
3.
A chip bag expands when you drive up north (to higher elevation)
4.
A balloon inflates in your hot car
5.
A turkey plunger pops when the turkey is done
Practice
Use the heating curve graph to respond to the following:
8. Label each section of the graph.
e
9. What is the boiling point?_____
d
c
b
a
10. What is the melting point?_____
11. What is the freezing point?_____
12. Is the substance water?_____
13. What evidence do you have for the
answer to number 5?
14. Explain what is happening to energy and molecular motion at each section:
a.___________________________________________________________________________
b.___________________________________________________________________________
c.___________________________________________________________________________
d.___________________________________________________________________________
e.___________________________________________________________________________
15. Describe energy flow in the following systems?
a. hot bowl of chili put into fridge:
b. hot metal into a calorimeter
16. How is heat transferred from one item to another (direction of transfer, way transfer occurs
molecular level), type of energy transferred)?
17. Determine the specific heat when 88.4 g of a metal heated to 96.7 C is dropped into 65.0 ml
of water (specific heat H2O = 4.184 J/g °C) starting at 25.0 C and eventually reaching a final
temperature of 33.7 C
18. How much heat is required to raise 151 grams of water from 21.0°C to boiling, to make a cup
of tea?
19. A cube of gold weighing 192.4g is heated from 30.0°C to some higher temperature, with the
absorption of 226 joules of heat. The specific heat of gold is 0.030 J/g∙°C. What was the final
temperature of the gold?
Substance
J/(gXoC)
water
4.18
vegetable oil
2.000
aluminum
0.90
concrete
0.880
glass
0.50
silver
0.24
Use the chart on the left to answer the following:
20. If the same amount of heat was added an equal amount of each
substance which would have the largest temperature change?
21. For the same scenario as number 13 which would have the
smallest temperature change?
22. If you heated the same amount of each item to the same
temperature which would require the most energy?
23. For the same scenario as number 15 which would release the smallest impact on it’s
environment?
24. Which would be the best to make a cup out of? and why?
Describing Substances
Use observations to determine physical and chemical properties of a substance.
Identify properties as physical or chemical.
Identify changes as physical or chemical.
Use a balance, graduated cylinder, metric ruler and thermometer correctly.
Identify methods to separate substances based on their physical properties.
Identify types of mixtures and /or solutions.
Vocabulary DEFINE include EXAMPLE
MassDensityMelting pointPhysical propertyHardnessFlammabilityChemical propertyHeterogeneous mixtureHomogenous mixtureFiltrationDistillationEvaporationElementCompound Pure substanceChemical changePhysical changePhase change-
Practice
1.
.
What are the main indicators a chemical change has occurred?