Nature of Science
Experimental Design
EM Spectrum
Reflect, Refract, Absorb
Wave Speed
100
Unprotected exposure to the sun’s rays is a factor in the development of skin cancer. Which of the following is an example of empirical evidence that supports this hypothesis? (7.N.1.6)
A. a sunscreen advertisement B. data about skin cancer C. a skin cancer survivor’s memory about a bad sunburn as a child D. a model of a skin cell showing where DNA is in the cell
B
100
A scientist wants to know why the honeybee population is declining. Which step would the scientist most likely to do first? (7.N.1.7)
A) Research to see if there is already a widely accepted explanation.
B) Observe the problem and make a hypothesis about what is causing it.
C) Communicate the question to as many other scientists as possible so that they can discuss it.
D) Conduct an experiment to see if increased pollution is causing a decrease in the honeybee population.
A
100
Rain, wind, and temperature change cause _________________ weathering.
physical
100
Erosion is the ________________ of sediment.
What is movement?
100
________________ changes cause physical weathering.
Temperature
200
Scientists pursue scientific explanations by using observations and inferences. Which of the following statements is an inference? (7.N.1.5)
A) The plant’s leaves are green and appear wilted.
B) The plant uses water to perform photosynthesis.
C) The plant's leaves are wilted due to lack of water.
D) The plant absorbs water through its root system.
C
200
Claire decided to find out which wildflowers are most abundant near roadsides in her community. Which of the following would best help Claire with her investigation? (7.N.1.3)
A) observation B) making a physical model
C) using a computer model D) conducting a controlled experiment
A
200
Oxidation is another word for rust, and is an example of ________________ weathering.
Chemical
200
When erosion slows and sediment is settled into place, this is called _______________.
What is deposition?
200
Scientists notice that a river delta has been gradually getting larger and shallower over the past 50 years. What is the MOST LIKELY reason for this change?
Silt is deposited as the river slows down.
300
If a scientist makes a new discovery, other scientists review and ______________ the results before the discovery can be published.
What is replicate?
300
According to the Rate of Carrot Growth with Growfast Fertilizer graph below, what is the BEST amount of fertilizer to use to grow carrots the fastest?
8 grams
300
Through freezing and thawing, a boulder is broken into smaller pieces. This is an example of:
Physical Weathering
300
Explain how and why erosion could be harmful.
Answers vary.
300
Increasing the temperature of a chemical reaction ______________ the reaction rate (speed).
Increases
400
A scientist conducted an experiment to determine how the amount of salt in a body of water affects the number of aquatic plants that can live in the water. What is the outcome (dependent) variable?
Number of plants
400
Kodak Black wants to create a new sound for his music. He is testing new sound equipment to produce the music. His testing is informal, flexible, and does not need to follow a specific scientific method. Yet he still learns from his experience. Is this an example of an experiment or an investigation?
investigation
400
Which of the following is NOT an example of chemical weathering?
A. oxidation
B. frost heaving
C. acid rain
D. carbonation
Frost heaving (physical change)
400
Erosion can be decreased with an abundance (greater number) of _____________.
plants
400
"Sunset in a Bag" included changes in temperature and formation of new substances. Thus, this was a demonstration of _______________ changes.
Chemical
500
Jason states the following prediction: “As the air temperature increases, the air in a balloon will expand, increasing the circumference of the balloon.” Some of Jason’s observations during his experiment are shown.
What is the test variable (independent variable) AND the outcome variable (dependent variable) for an experiment designed to test Jason’s prediction?
Independent: temperature.
Dependent: balloon size.
500
Consider the following hypothesis: “The time it takes for sugar to dissolve in water depends on the temperature of the water.” What is the test (independent) variable for this experiment? (7.N.1.4)
the temperature of the water in which the sugar was placed
500
Explain how and why the Greek Acropolis is undergoing both chemical and physical weathering. Give examples of each.
Acid rain
Wind
Temperature change
500
Identify all of the contributing factors to this example of erosion:
Ocean water
Atmospheric moisture
Wind
Gravity
Man-made factors
500
Jamie has 3 glow sticks. She puts one in boiling water, another in ice water and another in room temperature water. What situation below is correct?
A. The glow stick placed in the boiling water will be brightest but will last less time than the other glow sticks.
B. The glow stick placed in the ice water will be the brightest but will last less time than the other glow sticks.
C. The glow stick placed in the room temperature water will be the brightest and will last more time than the other glow sticks.
D. All three glow sticks will have the same brightness for the same amount of time.
A. The glow stick placed in the boiling water will be brightest but will last less time than the other glow sticks.