DDA 2015 - SCIENCE

(Chapt 1) While collecting data during an experiment on plant growth, Bill sees the situation shown above. How many centimeters taller than the plant on the left is the plant on the right? A. 0.7 cm B. 2.2 cm C. 2.9 cm D. 5.1 cm

A. 0.7 cm

(Chapt 3) An ad for a brand of dry ice claims that the dry ice keeps food cold without getting it wet. Which of the following is a valid explanation for this claim? A. Dry ice undergoes sublimation. B. Dry ice is not frozen. C. Dry ice is colder than ice made from water. D. Dry ice keeps food from freezing.

A. Dry ice undergoes sublimation.

(Chapt 1) Katie wants to learn how various amounts of sunlight affect plants. Which of the following variables is the only one that she should change? A. the type of plant B. the amount of light C. the volume of water D. the quantity of nutrients

A.the type of plant

(Chapt 20) The amount of energy that a wave carries is related to the wave's amplitude and wavelength. Which of the following waves would carry the most energy? A. B. C. D.

A

(Chapt 20) Use the table below to answer question 6. The data above were collected for sound waves traveling through water. If all other factors were the same, how far did the sound wave travel after 4 seconds? A. 5.0 km B. 5.5 km C. 6.0 km D. 6.5 km

A. 5.0 km

(Chapt 3) In a laboratory experiment, Rashida observed water as it vaporized, froze, melted, and condensed. Which of the following is a valid conclusion? A. She observed different changes of state. B. Each of these processes happened at different temperatures. C. All of the changes required energy to be absorbed. D. All of the changes required energy to be released.

A. She observed different changes of state.

(Chapt 4) Which of the following sentences best describes table salt, NaCl? A. Table salt is a compound made from two elements. B. Table salt is a mixture made from two elements. C. Table salt is an element made from two mixtures. D. Table salt is an alloy made from a metal and a nonmetal.

A. Table salt is a compound made from two elements.

(Chapt 4) If two poisonous elements are combined chemically, which of the following will be true of the resulting compound? A. The compound will be more poisonous than the gases. B. The compound will be as poisonous as the gases. C. The compound may or may not be poisonous. D. The compound will not be poisonous.

A. The compound will be more poisonous than the gases.

(Chapt 23) Use the diagram below to answer questions 5-7. Kenneth drew the above diagram of a helium-neon laser during a lab experiment. What is the purpose of the mirrors inside a laser? A. The mirrors bring the light into focus. B. The mirrors reflect photons back through the tube. C. They filter all but one wavelength of light. D. They heat the atoms into an excited state.

A. The mirrors bring the light into focus

(Chapt 23) A slide projector makes a small image larger as it projects the image onto a screen. How does a slide projector magnify an image? A. The projector uses a convex lens. B. The projector uses a convex mirror. C. the projector uses a concave lens. D. The projector uses a concave mirror.

A. The projector uses a convex lens.

(Chapt 2). Which of the following statements about chemical properties is true? A. They can be observed when the identity of a substance changes. B. They can always be observed without changing the identity of a substance. C. They are easier to observe than physical properties. D. They are the properties that are most useful in identifying a substance.

A. They can be observed when the identity of a substance changes

(Chapt 23) The table above describes the reflection of a dog as seen in four different mirrors. Which image was seen in a concave mirror with the dog standing less than 1 focal length away? A. image A B. image B C. image C D. image D

A. image A

(Chapt 4) Imagine that you were asked to classify four samples of equal and known volume, each of which was made up of a single element. Which factor would be most useful for identifying them? A. mass B. shape C. hardness D. original source

A. mass

(Chapt 2). A chemical change takes place during a laboratory investigation of the properties of magnesium. Which of the following may have been observed? A. Magnesium burns in the presence of oxygen. B. Magnesium melts at 649°C. C. Magnesium becomes malleable when it is heated. D. Magnesium conducts an electric current.

A.Magnesium burns in the presence of oxygen

(Chapt 1) Which of the following statements about the records made during a scientific investigation is true? A. Records should be recorded clearly and accurately. B. Records should be predicted based on the hypothesis. C. Records should be modified to support the hypothesis. D. Records should be protected from being seen by other scientists.

A.Records should be recorded clearly and accurately

(Chapt 1) Acids turn blue litmus paper red, and bases turn red litmus paper blue. Look at the table above. What is the identity of substance 3? A. drain cleaner B. vinegar C. hydrochloric acid D. baking soda

A.drain cleaner

(Chapt 2) A substance in the table has a mass of 10 g and a volume of 10 cm 3 .What is the substance? A. mercury B. oxygen C. water D. helium

A.mercury

(Chapt 1) What would happen when water is tested using a piece of blue litmus paper? A. The litmus paper would not change color. B. The litmus paper would turn pink. C. The litmus paper would turn red. D. The litmus paper would turn light blue.

A.the litmus paper would not change color

(Chapt 3) What equipment would you use to measure 10 mL of water for an experiment? A. B. C. D.

B

(Chapt 4) The graph above was constructed from data collected during a laboratory investigation. Which of the following values is the amount of sodium nitrate that can dissolve in 100 mL of water at 40ºC? A. 0 g B. 40 g C. 100 g D. 130 g

B. 40 g

(Chapt 2) In an experiment that compares the densities of liquids, you must analyze the beaker shown above. Which statement best describes how the densities of the liquids compare? A. Liquid M is more dense than Liquid N. B. Liquid N is more dense than Liquid L. C. Liquid L is more dense than either Liquid M or Liquid N. D. Liquid M is more dense than either Liquid L or Liquid N.

B. Liquid N is more dense than liquid L

(Chapt 3) The diagrams above were used to illustrate the arrangement of the particles of a substance in three different states of matter. Which of the following statements is correct? A. The particles in diagram 1 move faster than the particles in diagram 2. B. The particles in diagram 3 move fast enough to break away from each other. C. The particles in diagrams 1 and 2 are locked in place. D. The particles in diagram 2 are affected by electric and magnetic fields.

B. The particles in diagram 3 move fast enough to break away from each other.

(Chapt 23) Side mirrors on cars are convex mirrors. What would you see if you put your face very close to a side mirror? A. a larger real image of your face, right side up B. a smaller virtual image of your face, right side up C. a larger virtual image of your face, right side up D. a smaller real image of your face, upside down

B. a smaller virtual image of your face, right side up

(Chapt 23) Which image described in the table above is a real image? A. image A B. image B C. image C D. image D

B. image B

(Chapt 2) Max drops one effervescent tablet into a beaker of water and places an identical tablet on the lab table. He observes bubbles of gas form on the surface of the first tablet. The bubbles rise and break on the surface of the water. After several minutes, no more bubbles form and the tablet is not visible in the water. The tablet on the lab table is unchanged. What conclusion should Max draw from his observations? A. The tablet that was placed in the water changed directly into a gas through a physical change. B. The tablet that was placed in the water broke down when exposed to light and formed a gas through a chemical change. C. The tablet that was placed in the water caused dissolved gases in the water to be released through a physical change. D. The tablet that was placed in the water interacted with the water to form a gas through a chemical change.

B. the tablet that was placed in the water changed directly into a gas through a physical change

(Chapt 2) When oxygen in the air reacts with iron, iron oxide forms. Which statement is correct? A. This is a physical change. B. This is a chemical change. C. Iron and iron oxide have the same properties. D. Oxygen and iron have similar properties.

B. this is a chemical change

(Chapt 1) Which factor would have the least effect on the results of an experiment designed to determine which brand of bar soap most effectively kills bacteria? A. the color of the soap B. the volume of soap used C. the surface on which the soap is used D. the ingredients in the soap

B.. the volume of soap used

(Chapt 4) Ka-wai makes a solution which contains the maximum amount of sodium chlorate that can dissolve in 100 mL of water at 0ºC. He heats the solution to 60ºC. How much additional sodium chlorate must he add to once again have a solution that has the maximum amount of sodium chlorate dissolved in it at this new temperature? A. 2 g B. 40 g C. 50 g D. 80 g

C. 50 g

(Chapt 20) What is the frequency of a wave that has a wavelength of 3 m and a speed of 18 m/s? A. 3 Hz B. 6 Hz C. 9 Hz D. 15 Hz

C. 9 Hz

(Chapt 4) You are given two jars, each of which contains an unknown substance. You are asked to determine if the substances are different from one another or if each jar contains the same substance. What should you do to complete this task? A. Compare the appearances of the substances. If the substances look the same, then they are the same. B. Compare only the physical properties of the substances. If the substances have the same density or melting point, then they are the same. C. Compare both the physical and the chemical properties of the substances. If the substances perform the same in a variety of tests, then they are the same. D. Compare the physical states of the substances. If the substances are in the same state, then they are the same.

C. Compare both the physical and the chemical properties of the substances. If the substances perform the same in a variety of tests, then they are the same.

(Chapt 3) Which of the following sentences best describes the process that happens when liquid water becomes ice at its freezing point? A. Energy is added to the water, so its particles move slower. B. Energy is added to the water, so its particles move faster. C. Energy is removed from the water, so its particles lock into place. D. Energy is removed from the water, so its particles move apart.

C. Energy is removed from the water, so its particles lock into place.

(Chapt 23) When Greg stands on a spot in front of a funhouse mirror, he cannot see a clear image of himself. What conclusion can Greg draw about the mirror and his position in front of it? A. Greg is located more than 1 focal length away from a concave mirror. B. Greg is located less than 1 focal length away from a convex mirror. C. Greg is located at the focal point of a concave mirror. D. Greg is located directly between a concave and a convex mirror.

C. Greg is located at the focal point of a concave mirror.

(Chapt 3) Which of the following sentences describe oxygen at room temperature? A. It has a constant volume and a definite shape. B. It has a constant volume but takes the shape of its container. C. Its particles move fast enough to overcome the attraction between them. D. Its particles have a very orderly, three-dimensional arrangement.

C. Its particles move fast enough to overcome the attraction between them.

(Chapt 3) Madison conducted an experiment to find out what happens to the temperature of water after the water starts boiling. She measured the water's temperature every 30 s during the experiment. Which of the following statements describes how she should graph her data? A. Place time on the x-axis and boiling point on the y-axis. B. Place amount of water on the x-axis and temperature on the y-axis. C. Place time on the x-axis and temperature on the y-axis. D. Place temperature on the x-axis and boiling point on the y-axis.

C. Place time on the x-axis and temperature on the y-axis.

(Chapt 4) Ellen made the illustration above to show one of the steps in her most recent experiment. Which statement describes what Ellen was doing during this step of the experiment? A. She was using a chemical change to break down a compound into the elements that make it up. B. She was using a physical change to separate the compounds that make up an element. C. She was using a physical change to separate the components that make up a mixture. D. She was using a chemical change to combine elements to form a compound.

C. She was using a physical change to separate the components that make up a mixture.

(Chapt 3) In a laboratory experiment, Kevin compared the viscosities of several substances. Substances A, B, and C flowed at different rates, but substance D did not flow at all. Which of the following is a valid conclusion? A. Substance D is at its melting point. B. Substance D is in the same state as the other substances. C. Substance D is a solid. D. Substance D's particles have little attraction to one another.

C. Substance D is a solid.

(Chapt 23) What would happen if Kenneth passed the red light from the laser above through a glass prism? A. The resulting light would be red. B. The resulting light would be white. C. The light would be split to form a rainbow. D. The light would not pass through.

C. The light would be split to form a rainbow.

(Chapt 2). Which physical property can be used to classify oxygen, helium, propane, and hydrogen as being similar? A. flammability B. state C. reactivity D. malleability

C.reactivity

(Chapt 23) Which of the following statements about Kenneth's diagram is correct? A. Laser light contains light waves of many wavelengths. B. Laser light contains light waves of many colors. C. Laser light is tightly focused and does not spread out much. D. Laser light spreads out a lot, even over short distances.

D. Laser light spreads out a lot, even over short distances.

(Chapt 20) Marie is conducting an experiment about diffraction. Which of the following hypotheses could she test in order to learn more about diffraction? A. Light waves will bend as they pass through a small opening. B. Light waves will bend as they move from air to water. C. Light waves will pass through different media at different speeds. D. Light waves will bounce off of objects.

D. Light waves will bounce off of objects.

(Chapt 23) Jordan is nearsighted. Which of the following describes how lenses are used to correct her vision, so that she can focus on objects that are far away? A. The concave lenses in Jordan's eyeglasses refract the light outward. The convex lenses in her eyes focus the refracted light onto her retinas. B. The convex lenses in Jordan's eyeglasses focus the light inward. The convex lenses in her eyes focus the refracted light onto her retinas. C. The concave lenses in Jordan's eyeglasses refract the light outward. The concave lenses in her eyes focus the refracted light onto her retinas. D. The convex lenses in Jordan's eyeglasses focus the light inward. The concave lenses in her eyes focus the refracted light onto her retinas.

D. The convex lenses in Jordan's eyeglasses focus the light inward. The concave lenses in her eyes focus the refracted light onto her retinas.

(Chapt 3) The table above shows data from a laboratory experiment in which Andrew measured the temperatures of water in various states. Which of the following would be a correct conclusion from this experiment? A. The particles in ice water have less energy than the particles in ice do. B. The particles in ice have more energy than the particles in water do. C. The particles in ice water have more energy than the particles in boiling water do. D. The particles in boiling water have more energy than the particles in ice water do.

D. The particles in boiling water have more energy than the particles in ice water do.

(Chapt 2) Look at the table above. Which of the following statements about mercury is true? A. It is the densest gas listed. B. Its density is less than the density of water. C. It is a solid at 20°C and 1.0 atm. D. It is the densest substance listed.

D. it is the densest substance listed

(Chapt 4) Which two substances in the table are most likely the same? A. substances A and C B. substances B and D C. substances C and D D. substances A and D

D. substances A and D

(Chapt 1) After swimming in the ocean, Jorge sits in the sun to dry off. He notices small white crystals on his skin. Analyze the strengths and weaknesses of the following explanations. Which is the most reasonable explanation for what has happened to Jorge? A. The water evaporated and attracted dust to Jorge's skin. B. The white crystals are dead skin cells that are being shed. C. Jorge has developed a rare skin disorder. D. Salt that is dissolved in the water remained on Jorge's skin after the water evaporated.

D.Salt that is dissolved in the water remained on Jorge's skin after the water evaporated

(Chapt 2). Which of the following statements describes a chemical change? A. Clear water turns red after a dye is added. B. Ice melts. C. Salt dissolves in water. D. Milk sours.

D.milk sours

(Chapt 1) An environmental scientist suspects that acid precipitation is beginning to affect certain lakes in Georgia. What is the best way to test this hypothesis? A. to do library research on the harmful effects of acid precipitation in lakes B. to experiment with acid precipitation on water plants native to Georgia C. to count the number of water-plant species found in a Georgia lake D. to collect lakewater samples and test the pH of each sample

D.to collect lakewater samples and test the pH of each sample

(Chapt 1) Anthony is designing an experiment to test the effect of water temperature on the solubility of sugar. Describe one way that Anthony might do his experiment. Remember to include a list of variables that he should control.

anthony has to take the temperature of his water continuiously and record data

(Chapt 1) What type of model would you use to represent the big bang theory? A. physical B. conceptual C. mathematical D. analogical

c. mathematical

(Chapt 2). Two balls are made of solid, white plastic. Both balls have the same diameter. One ball has twice the mass of the other. What can you conclude that would explain this difference?

one's mass is larger than thee other's