SC.5.N.2.2

Yoshi is investigating the way surface area affects the evaporation of water. She pours the same amount of water into a shallow dish and into a tall, narrow jar. She measures the volume of water left after a few days. What is the best reason for Yoshi to record her steps and results carefully?

• The experiment will still work if it is cloudy

• She does not need to do the experiment again

• No one else will have to carry out the experiment

• Another student can repeat the experiment to check the results

Mrs. Wakula mixes salt and pepper in a beaker of water. Then she pours the mixture through filter paper. She finds that the filter paper separates out the pepper but not the salt. If this conclusion is correct, what should happen if Mr. Wrye repeats the experiment?

• He should not use filter paper

• He should get the same results.

• He should follow a completely new procedure.

• He should use different amounts of salt and pepper.

Tags

NGSS.MS-PS1-2

Professor Wilkins is a biologist studying the habitats of pandas. Last summer she observed pandas in China. What is the best reason for the professor to make careful notes of her observations, procedures, and conclusions?

• so that other scientists can check her results

• so that scientists in China will not criticize her work

• to make sure the habitats of the pandas do not change

• to draw conclusions about the habitats of animals in other regions.

Scientists frequently repeat the experiments of others scientists. Why is this important in science?

• Scientists often ask each other for help in performing experiments.

• Replication of experiments helps to confirm and verify results.

• Scientists frequently perform other scientists’ experiments in order to practice their technique.

• Repeating experiments is an effective way to make sure a laboratory is in optimal condition.

Tags

NGSS.MS-LS2-4

Caira reads in a science journal that replication and repetiton are so important, but she did not understand the  difference between them. Which of the following best explains the two terms?

• Repetition is when a scientist repeats an experiment; replication is when a scientist conducts an experiment on genetic material.

• Repetition is when a scientist does the same experiment a number of times; replication is when other scientists reproduce a scientist’s experiment.

• Repetition is when a scientist publishes in more than one scientific periodical; replication is when another scientist reproduces another scientist’s results.

• Repetition is when a scientist commits an error in an experiment the first time and must repeat it; replication is when a scientist repeats an experiment to make sure it is valid.

Kaitlyn grew plants outside in different soils for her school science fair. She did her experiment three times. Each time, she recorded plant height daily and also wrote observations in an experiment log. The second time she did the experiment, her data was very different from the data in the other two experiments. Which of the following observations in Kaitlyn’s experiment log might explain the difference?

• She watered her plants the same amount each day.

• It rained for three days during the second experiment.

• The plants were all grown on the patio behind her house.

• She followed her procedure very carefully each time

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

The science lab for the week was to investigate the affect of color on heat absorption. The class decided to compare heat absorption using the color black as compared to the color white. The results of four of the five lab groups indicated that more heat is absorbed by the color black. What should the lab groups do to determine why one group got different results?

• All groups should immediately try the experiment again.

• Compare the procedures of the one group to the other four groups.

• The group that concluded that white colors absorb more heat deserve a failing grade.

• Change the data of the group that had different findings to match the others.

Mrs. Blackman ask the whole class to go home and do an experiment to determine what melts faster frozen salt water or frozen fresh water. You go home and take careful notes, in the morning you are talking with your friend before class and find out that you both got different answers. You said salt water melted faster and your friend said fresh water. What should you do?

• Ask the rest of your classmates and go with their answers

• review your procedures and see where one of you or your friend made a mistake and then repeat the experiment again

• Change your answer cause your friend gets higher grades than you

• Go ask Mrs. Miller

Tags

NGSS.MS-LS1-5

What would happen if a person did not write clear procedures and someone else tried to copy their experiment?

• the results would be slightly different

• the results would be the same

• it would be easy to do the same experiment

• there would be no way to replicate the experiment

A famous scientist did an experiment and published his results. When a scientist in another country repeated the experiment he got very different results. What should the second scientist do?

• tell everyone the first scientist was wrong

• decide his results must be wrong

• review both experiments to determine why the results were different

• change his data to match the famous scientist’s data

Tags

NGSS.HS-LS4-1