PQ 1.4 Scientific Research

Dependent Variable

• a variable that is not changed.
•  a constant variable that is part of the experiment that is not being tested and is used for comparison. Also called control group.
• the variable responding to the independent variable. Written in the second part of the hypothesis ("then, ____"). Usually, a measurement or observation.
• the variable that changes in an experiment; what is being tested. Written in the first part of the hypothesis. "If ____"

Tags

NGSS.MS-PS2-2

Independent Variable

• a variable that is not changed.
•  a constant variable that is part of the experiment that is not being tested and is used for comparison. Also called control group.
• the variable responding to the independent variable. Written in the second part of the hypothesis ("then, ____"). Usually, a measurement or observation.
• the variable that changes in an experiment; what is being tested. Written in the first part of the hypothesis. "If ____"

Tags

NGSS.MS-PS2-2

Which is the strongest scientific question?

• Does pollution cause the global warming?
• Do computer models improve an athlete's performance?
• What is DNA?
• Does the weight of an object affect the speed it takes to fall?

Tags

NGSS.MS-ESS3-5

Which of the following is considered a good, testable question?

• Why do some basketballs bounce higher than others?
• What is the coating on a basketball made of?
• Is basketball a more challenging sport than soccer?
• What is the effect of air pressure on a basketball's bounce height?

Tags

NGSS.HS-PS3-4

Which of the following is a good, testable question?

• What is the effect of the amount of fertilizer on the mass of a pumpkin?
• Does the type of pumpkin affect where it grows?
• They type of pumpkin affects the mass of the pumpkin?
• how does mass affect fertilizer?

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Grace wanted to see if her plants would grow faster if they were placed under an artificial growing lamp instead of sunlight. She placed half of her plants in a room with two windows and an artificial growing lamp. She placed the other half of the plants in a room with six windows. What is one major mistake Grace made when setting up this experiment?

• The plants receiving light from the artificial lamp were placed in different sized containers.

• All of the plants received equal amounts of fertilizer.

• All of the plants were watered the same amount.

• She used two different kinds of plants

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-6

For scientific data to be considered accurate and reliable, tests should be

•  repeated no more than 2 times.
•  conducted 3 times.
• conducted only 1 time.
• conducted as many times as possible.

Tags

NGSS.MS-ETS1-4

NGSS.MS-PS2-5

You want to know which of the two routes going to school is the shortest time to reach if you walk or use your bicycle. What experimentation would be best to use?

• Count every step from your house to school as you walk.

• Monitor the time of departure and arrival when using each route, then compare.

• Measure each distance using meter stick and compare.

• Measure the time travel on one of the route going to school and do the same on the other one as you go back from school.

Tags

NGSS.MS-ETS1-3

A grade 7 science student wants to know the effect of acid rain in seed. He planted the seeds of mongo on 5 cans of soil and watered it consistently in two days with different pH of solution of water and vinegar respectively. What is the effect of the acidity of water to the number of seeds that will germinate? (Germination is the processes where seed grows into a seedling or sprout.) The possible hypotheses are:

The more acidic the water, the more seeds will germinate.;

The more acidic the water, the lesser seeds will germinate.;

The acidity of the water does not affect the germination of the seeds.

Which of the following is NOT a controlled variable in the hypotheses?

• The amount of water poured in each can.

• The number of seed germinated.

• The number of seeds planted.

• The type of seeds planted.

Tags

NGSS.MS-LS1-5

It has a wide base, narrow neck and conical form, convenient laboratory experimentation for swirling liquids by hand.

• Test Tube

• Pipette

• Erlenmeyer Flask

• Bunsen burner