3. According to the Law of Conservation of Mass, how much zinc was present in the zinc carbonate?
Name ________________________________
1. The safest way to dilute concentrated sulfuric acid is to add
O a. a series of small volumes of water to the acid while stirring
O b. the acid to water slowly while stirring
O c. the acid to a small volume of water and then add more water
O d. dilute sulfuric acid to a small volume of concentrated acid
2. The smell of an ammonia solution used to clean a floor can quickly be detected throughout a house. Scientists explain this phenomenon by theorizing that gas molecules from the ammonia are in continuous random high-speed motion, drifting rapidly and permeating the air. Which of the following statements best demonstrates the strength of this theory?
O a. Scientists have observed tiny smoke particles moved by unseen particles in a rapid, irregular fashion.
O b. Scientists have unanimously agreed on this theory since Thomas Graham's experiments in the 1820s.
O c. The possibility of another theory being formed to explain the phenomenon as well is very remote.
O d. Reason, as opposed to experimentation, is superior to any explanation found through chemical testing.
3. According to the Law of Conservation of Mass, how much zinc was present in the zinc carbonate?
O a. 50 grams
O b. 75 grams
O c. 100 grams
O d. 125 grams
4. At which temperature do KBr and KNO3 have the same solubility?
O a. 27 oC
O b. 48 oC
O c. 65 oC
O d. 80 oC
5. A science class is conducting an experiment that produces noxious fumes. Because of inadequate ventilation, some students begin to feel nauseated and dizzy. The first response should be to
O a. neutralize the acid that is reacting to produce the noxious fumes
O b. carry the reactants outside, away from other students
O c. leave the room and go to an area with fresh air
O d. spray the reaction with a fire extinguisher
6. Based on the data gathered in this experiment, which of the following is the most appropriate hypothesis regarding the relationship between force and length?
O a. There is no relationship between force and length.
O b. The shorter the lever length, the lower the force required.
O c. The longer the lever length, the lower the force required.
O d. The closer the fulcrum to the mass, the higher the force required.
7. According to this graph, which angle of release would cause the javelin to go the farthest?
O a. 75o
O b. 60o
O c. 45o
O d. 30o
Use this table to answer questions 8 - 11.
8. Which element is an alkali metal?O a. Potassium9. Which element is a halogen?
O b. Magnesium
O c. Aluminum
O d. SilverO a. Sodium
O b. Bromine
O c. Neon
O d. Oxygen10. All elements in period 4 have
O a. the same oxidation number
O b. the same number of electron energy levels
O c. the same chemical properties
O d. the same number of protons11. All elements in group 17
O a. are nonmetals
O b. have the same number of protons
O c. react with the nobel gases
O d. have the same number of electron energy levels
12. A wheelbarrow full of concrete mix that needs to be moved onto a platform could be moved either by lifting it above the ground and setting it onto the platform or by using an inclined plane. The advantage of using the inclined plane is that the work can be done
O a. more quickly
O b. with less friction
O c. with less force
O d. using more energy
13. The density of this box is
O a. 0.5 g/cm3
O b. 1.0 g/cm3
O c. 1.5 g/cm3
O d. 2.0 g/cm3
14. The Earth makes a complete rotation once every 24 hours. Which of these drawings best illustrates rotation?
O a. drawing A
O b. drawing B
O c. drawing C
O d. drawing D
15. In this scale drawing, one centimeter is equal to one-half of a meter. The mailbox is 2 truck lengths away from the model truck. How far away is the mailbox from the truck on the real street?
O a. 5 meters
O b. 10 meters
O c. 15 meters
O d. 20 meters
16. Which of the following does not show te density of a solution using metric units?
O a. 10.5 grams/milliliter
O b. 1.56 pounds/ fluid ounce
O c. 1050 kilograms/cubic meter
O d. 1.05 grams/cubic centimeter
17. The picture shows how to make an electromagnet. Which of the following would make the electromagnet stronger?
O a. using a longer wire from the battery to the nail
O b. wrapping the wire around the nail more times
O c. wrapping the wire around a nonmetallic object
O d. making the loops of wire less tightly coiled
18. Compounds are made up of more than one element. Which of the following represents a compound?
O a. H2
O b. O3
O c. NH3
O d. N2
19. In this atomic model, object A represents?
O a. a proton
O b. the nucleus
O c. a neutron
O d. an electron
20. Which of these would be different for an object if measured on the Earth and on the moon?
O a. mass
O b. weight
O c. volume
O d. density
21. Which of these best shows that calcium is different from all other elements?
O a. its positive electrical charge
O b. its presence in milk
O c. its number of protons
O d. its ability to combine with oxygen
22. Students measured and recorded the density of 4 samples. using the density column and the data table, which of the samples will probably float on top of the oil?
O a. sample A
O b. sample B
O c. sample C
O d. sample D
23. Which type of energy change is occuring in this drawing?
O a. mechanical energy to chemical energy
O b. potential energy to kinetic energy
O c. chemical energy to heat energy
O d. solar energy to nuclear energy
24. This diagram contains one battery, one switch, and three bulbs. Which bulb(s) will be lit in the diagram?
O a. A
O b. A and C
O c. B and C
O d. A, B, and C
25. Chemical weathering has been observed to occur faster in the Southeast USA than in the Southwest USA. Which of the following hypotheses best explains this observation?
O a. The warm, moist climate makes reactions in solution occur at a faster rate.
O b. The warm, moist climate produces more wind.
O c. The cool, dry climate makes reactions in solution occur at a faster rate.
O d. The cool, dry climate produces more wind.
26. Which two simple machines does this device use to make work easier?
O a. an inclined plane and a pulley
O b. a wheel and axle and a wedge
O c. gears and a lever
O d. a wheel and axle and a lever
27. Students in Mrs. Smith's class are trying to find the average mass of their backpacks. The information is displayed on this chart. The chart shows the majority of students have backpacks with a mass of
O a. 2 - 3 kilograms
O b. 4 - 5 kilograms
O c. 6 - 7 kilograms
O d. 8 - 9 kilograms
28. 
Which of these is the next phase of the moon?
O a.
O b.
O c.
O d.
29. The most common cause of earthquakes is
O a. the sinking of the ocean floor
O b. movements in the Earth's crust
O c. giant tidal waves called tsunamis
O d. unequal heating of the atmosphere
30. What is the length of the tadpole?
O a. 2.8 cm
O b. 3.1 cm
O c. 3.5 cm
O d. 4.0 cm
31. When light hits an object, the rays can pass through it, bounce off it, or be absorbed by it. Light rays that bounce back are
O a. radiant
O b. reflected
O c. refracted
O d. radar
32. The amount of gravitational attraction between the Earth and an object depends on the object's distance from the Earth and the object's
O a. shape
O b. mass
O c. state of matter
O d. size
33. Which of these molecules does not contain three atoms?
O a. O3
O b. N2
O c. H2O
O d. CO2
34. A student predicts that more sugar will dissolve in warm water than in cold water. She puts some water in a container, adds sugar, and then stirs. The amount of undissolved sugar is then observed. When this student repeats the experiment to verify her precidtion, the only thing that should change is the
O a. amount of water used
O b. temperature of the water
O c. amount of sugar used
O d. amount of time stirring
35. A student determined the mass and volume of a gold ring. What physical property of the gold can be determined using these two measurements?
O a. reactivity
O b. expansion rate
O c. density
O d. melting point
36. Which drawing best shows particles of a mixture?
O a. drawing A
O b. drawing B
O c. drawing C
O d. drawing D
37. Which of these cannot be separated into its parts by an ordinary chemical or physical process?
O a. A mixture of salts (NaCl and KI)
O b. A compound of nitrogen (NH3)
O c. An atom of carbon (C)
O d. An acid of chlorine (HCl)
38. In an experiment combining vinegar and baking soda, gas is given off. In this chemical reaction, the vinegar and baking soda are
O a. reactants
O b. products
O c. elements
O d. suspenions
39. A wheel-and-axle is a lever that rotates around a fixed point. All of the following machines employ a wheel-and-axle except a
O a. bicycle
O b. skateboard
O c. pencil sharpener
O d. crowbar
40. Between points 4 and 5, energy is being used to change water from a
O a. solid to a liquid
O b. solid to a gas
O c. liquid to a gas
O d. liquid to a solid
41. Which diagram shows a circuit that will cause the light to come on?
O a. diagram A
O b. diagram B
O c. diagram C
O d. diagram D
42. Which of these correctly shows how a light ray is reflected from a mirror?
O a. diagram A
O b. diagram B
O c. diagram C
O d. diagram D
43. This flashlight uses three different forms of energy. Which of these shows the energy changes in the correct order?
O a. mechanicalheat
O b. heat
O c. electrical
O d. chemical
44. This drawing shows a Cartesian diver made from a plastic bottle filled with water and an inverted test tube partially filled with water. What causes the diver to sink as the bottle is squeezed?
O a. The size of the diver increases.
O b. The volume of air in the diver decreases.
O c. The water in the bottle becomes less dense.
O d. The air in the water comes out of solution
