Unit 1: Practice of Science Review (Comp 3)

What is this graph showing you?

• The worlds population has been growing and will continue to grow

• The worlds population was growing but now is decreasing

• The worlds population is staying the same

Tags

NGSS.MS-ESS3-4

Directions: Select the correct graph.
Mikey had two mice that were about the same age and weight. Mikey fed each of the two mice a different feed for a month. He measured how much the mice weighed every two days until the month was over. Mikey's results showed that although both mice gained weight over the month, mouse 2 gained more weight than mouse 1.Which graph below best shows these results?

• 1
• 2
• 3
• 4

A 5 kg bowling ball, a 0.25 kg baseball, and a 0.05 kg golf ball are dropped from a 100-meter high building. A camera catches the motion of the balls as they pass specific markers (in meters, m) on the building. The times (in seconds, s) that each object passes the markers are listed in the table below. Which of the following conclusions is true?

• Light objects fall faster than heavy ones.
  
• All objects fall at the same rate regardless of mass.
• Heavy objects fall faster than light ones.
• Objects of different shapes fall at the same rate

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

The _________________ variable is the variable that you purposely change in an experiment.

A person wants to test if using shampoo and water cleans hair better than just plain water. When she designs her experiment, what is the independent variable?

• The temperature of the water she uses

• The Amount of Water she uses

• Whether or not she uses shampoo

• How long she rinses the hair

A scientist conducted an experiment to determine how the amount of salt in a body of water affects the number of plants that can live in the water. In this experiment the dependent variable is

• the water.
• the amount of salt in the water.
• the number of plants in the water.
• the temperature of the water.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

NGSS.MS-LS2-1

What is a claim?

• Answers a question or problem

• long and detailed paragraph

• Explains why something happened

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-PS1-2

SC.7.N.1.2

Cara read an article on why repetition and replication 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.

Replication is when one scientist

• copies another scientist's experiment.

• laughs at another scientist's experiment.

• repeats their own experiment several times.

• clones another scientist.