CHEMISTRY EXAM
Name:
MATTER
Class:
Date:
1. Which substance has a definite shape and a definite volume at STP?
(1) NaCl(aq)
(2) Cl 2(g)
(3) CCl4( )
(4) AlCl 3(s)
2. Which grouping of the three phases of bromine is listed in order from left to right for increasing
distance between bromine molecules?
(1) gas, liquid, solid
(2) liquid, solid, gas
(3) solid, gas, liquid
(4) solid, liquid, gas
3. Which statement describes a chemical property of the element magnesium?
(1) Magnesium is malleable.
(2) Magnesium conducts electricity.
(3) Magnesium reacts with an acid.
(4) Magnesium has a high boiling point.
4. At STP, which physical property of aluminum always remains the same from sample to sample?
(1) mass
(2) density
(3) length
(4) volume
5. What occurs when a substance melts?
(1)
(2)
(3)
(4)
It changes from solid to liquid, and heat is absorbed.
It changes from solid to liquid, and heat is released.
It changes from liquid to solid, and heat is absorbed.
It changes from liquid to solid, and heat is released.
6. In which process does a solid change directly into a vapor?
(1) condensation (2) sublimation
(3) deposition
(4) solidification
7. Given the balanced particle-diagram equation:
Which statement describes the type of change and the chemical properties of the product and
reactants?
(1) The equation represents a physical change, with the product and reactants having different
chemical properties.
(2) The equation represents a physical change, with the product and reactants having identical
chemical properties.
(3) The equation represents a chemical change, with the product and reactants having different
chemical properties.
(4) The equation represents a chemical change, with the product and reactants having identical
chemical properties.
MATTER
8. Given the particle diagram representing four molecules of a substance:
Which particle diagram best represents this same substance after a physical change has taken
place?
(1)
(3)
(2)
(4)
9. Which two particle diagrams represent mixtures of diatomic elements?
(1) A and B
(2) A and C
(3) B and C
(4) B and D
MATTER
10. Which particle diagram represents a mixture of an element and a compound?
(1)
(3)
(2)
(4)
11. Which substance can be broken down by chemical means?
(1) CO
(2) Ce
(3) Ca
(4) Cu
12. An aqueous solution of sodium chloride is best classified as a
(1) homogeneous compound
(2) homogeneous mixture
(3) heterogeneous compound
(4) heterogeneous mixture
13. When a mixture of water, sand, and salt is filtered, what passes through the filter paper?
(1) water, only
(2) water and sand, only
(3) water and salt, only
(4) water, sand, and salt
14. Recovering the salt from a mixture of salt and water could best be accomplished by
(1) evaporation
(2) filtration
(3) paper chromatography
(4) density determination
15. A beaker contains both alcohol and water. These liquids can be separated by distillation because
the liquids have different
(1) boiling points (2) densities
(3) particle sizes
(4) solubilities
16. Two samples of gold that have different temperatures are placed in contact with one another.
Heat will flow spontaneously from a sample of gold at 60°C to a sample of gold that has a
temperature of
(1) 50°C
(2) 60°C
(3) 70°C
17. The temperature of a sample of matter is a measure of the
(1)
(2)
(3)
(4)
average kinetic energy of its particles
average potential energy of its particles
total kinetic energy of its particles
total potential energy of its particles
(4) 80°C
MATTER
18. Which sample of ethanol has particles with the highest average kinetic energy?
(1) 10.0 mL of ethanol at 25°C
(2) 10.0 mL of ethanol at 55°C
(3) 100.0 mL of ethanol at 35°C
(4) 100.0 mL of ethanol at 45°C
19. The temperature of a sample of a substance changes from 10.°C to 20.°C. How many Kelvin does
the temperature change?
(1) 10.
(2) 20.
(3) 283
(4) 293
20. Which temperature represents absolute zero?
(1) 0 K
(2) 0ºC
(3) 273 K
(4) 273ºC
21. The temperature 30. K expressed in degrees Celsius is
(1) 243ºC
(2) –243ºC
(3) 303ºC
(4) –303ºC
22. The temperature of 100. grams of water changes from 16.0ºC to 20.0ºC. What is the total number
of Joules of heat energy absorbed by the water?
(1) 105
(2) 168
(3) 420.
(4) 1680
23. A sample of water is heated from 10.0ºC to 15.0ºC by the addition of 126 Joules of heat. What is
the mass of the water?
(1) 5.00 g
(2) 6.00 g
(3) 30.0 g
(4) 150.0 g
24. When 420 Joules of heat energy is added to 10. grams of water at 20.ºC, the final temperature of
the water will be
(1) 10.ºC
(2) 30.ºC
(3) 40.ºC
(4) 100ºC
25. What is the minimum amount of heat required to completely melt 20.0 grams of ice at its melting
point?
(1) 20.0 J
(2) 83.6 J
(3) 6,680 J
(4) 45,200 J
26. What is the minimum number of kiloJoules needed to change 40.0 grams of water at 100C to
steam at the same temperature and pressure?
(1) 1,810 kJ
(2) 90.4 kJ
(3) 2.26 kJ
(4) .400 kJ
MATTER
27. The graph below represents the relationship between time and temperature as heat is added at a
constant rate to a sample of a substance.
During interval AB which energy change occurs for the particles in this sample?
(1)
(2)
(3)
(4)
The potential energy of the particles increases.
The potential energy of the particles decreases.
The average kinetic energy of the particles increases.
The average kinetic energy of the particles decreases.
28. Base your answer to the following question on the information below.
A student prepared two mixtures, each in a labeled beaker. Enough water at 20.°C was used to
make 100 milliliters of each mixture.
Describe a procedure to physically remove the water from mixture 1.
29. In the two mixtures described above:
Classify each mixture using the term "homogeneous" or the term "heterogeneous."
MATTER
Base your answers to questions 30 through 32 on the information below.
Starting as a gas at 206°C, a sample of a substance is allowed to cool for 16
minutes. This process is represented by the cooling curve below.
30. Using the key below, draw two particle diagrams to represent the two phases of the sample at
minute 4. Your response must include at least six particles for each diagram. {2 POINTS]
31. What is the melting point of this substance?
32. At what time do the particles of this sample have the lowest average kinetic energy?
MATTER
Base your answers to questions 33 through 35 on
the information below.
A student investigated heat transfer using a bottle of water. The student placed the bottle in a
room at 20.5°C. The student measured the temperature of the water in the bottle at 7 a.m. and
again at 3 p.m. The data from the investigation are shown in the table below.
33. State the direction of heat transfer between the surroundings and the water in the bottle from 7
a.m. to 3 p.m.
34. Compare the average kinetic energy of the water molecules in the bottle at 7 a.m. to the average
kinetic energy of the water molecules in the bottle at 3 p.m.
35. Calculate the change in the thermal energy of the water in the bottle from 7 a.m. to 3 p.m. Show
all work. [2 POINTS]