Nature of Science 2 4/30/2024

Scientific theories are usually

• based on opinions and feelings.

• supported by evidence and widely accepted by the community.

• unable to change as new data or technology emerges.

• claims posed by individuals.

Tags

NGSS.HS-PS4-3

Which of the following is a limitation of models?

• It is often easier to study models rather than the objects or events that they represent.

• Sometimes models provide data when data cannot be acquired from natural objects or events.

• Models are often safer to study than the objects or events that they represent.

• Models usually do not have exactly the same features as the objects or events that they represent.

Select the correct graph based on the data provided in the table for Bacteria Levels in Ohio Rivers.

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Julia designed an experiment to find out if microwaving apple seeds keeps the seeds from sprouting. First, Julia separated 24 apple seeds into four groups. Next, she set aside the first group to use as a control. Then, she microwaved the second, third, and fourth groups for different amounts of time. If Julia's experiment showed that fewer seeds sprouted as microwave time increased, which table would best show her results?

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Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

What is the test variable (independent variable) in this experiment? Janet learned in science class that the amount of salt that can dissolve in a certain amount of water depends on the temperature of the water. She decides to do an experiment to test this. She carefully adds salt, 100 mg at a time, to a cup of water and stirs until all the salt dissolves. When she has added so much salt that it will not dissolve after 5 minutes, she measures the temperature of the water. She records the temperature and the final amount of salt. She does this with cold water, cool water, room-temperature water, warm water, and hot water.

• the amount of salt

• the temperature of the water

• the amount of water

• how long it took the salt to dissolve

Tags

NGSS.MS-PS1-4

Which of the following is an observation?

• none of these

• John honked his horn several times, turned into the oncoming lane, and sped around a stalled car.

• John honked his horn several times and sped around a stalled car because he was angry.

• John honked his horn several times at a stalled car to teach the other driver a lesson.

How do Levi and Rachel's results compare?

• Their data is unreasonable.

• The differences in their data are too significant to report.

• Their data is exactly the same.

• The differences in their data are not significant.

Mrs. Vega's science class incubated chicken eggs to see if any of the eggs would hatch. One of the eggs did hatch, and the class kept the chick. They measured the chick's weight each week using a spring scale. The measurements from the chick's weekly weigh-ins are shown in the table below: Week 1: 0.1 Newtons Week 2: 0.5 Newtons Week 3: 1.0 Newtons Week 4: 1.7 Newtons Select the correct graph that accurately represents the data from the table.

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Tags

NGSS.MS-PS3-1

A science class conducted an experiment to learn more about solutions and their boiling points. The class broke up into three groups. Group 1 followed this procedure: 1. Place a 1-liter beaker filled with 500 mL of water on a hot plate. 2. Add 5.0 g of table salt, and stir until it is dissolved. 3. Carefully place a thermometer in the beaker with the solution. 4. Turn the hot plate on until the water boils, and then measure and record the temperature. 5. Turn off the hot plate, and allow 5 minutes for the solution to cool. 6. Pour out the solution and rinse the beaker. 7. Conduct steps 1-6 two more times. Other groups followed the same procedure, but each group added different amounts of table salt. The table below shows the data collected by each of the groups.

• A. the time for the solution to cool

• B. the volume of water in the beaker

• C. the boiling point of the solution

• D. the mass of the table salt added

Tags

NGSS.MS-PS1-2

Ivana is studying insect life cycles. She placed a male and a female gnat inside a terrarium. The female laid eggs. Ivana observed and recorded all of the stages she saw the eggs go through. Her results are shown in the table below.

• A. A gnat is a crustacean, not an insect.

• B. A gnat completes its life cycle in about 1 month.

• C. A gnat life cycle has more than five stages.

• D. A gnat generally does not live for more than 1 week.