Why do we want to test only one independent variable at a time?

To better identify what is causing the changes

Because it is hard to setup a data table with more than one variable

It is what has always been done

It's easier to perform the experiment

What is a hypothesis?

A hypothesis is an educated guess.

A hypothesis is the right answer to an experiment.

A hypothesis is the wrong answer to an experiment.

Dependent variable means

what is being measured/data collected

the scientist controls what to test/intentionally changed

If you increase the amount of spinach you eat, then you will increase the iron in your blood. What's the DEPENDENT variable?

increase the amount of iron in your blood

If I ride my bike to school instead of walking, then I will get to school faster. What is the DEPENDENT variable?

How many friends you meet along the way

If I listen to Mr. Castro's instructions, then I will have less accidents in the lab. What is the INDEPENDENT variable?

Listening or not listening to instructions

Likelihood of having an accident in lab

Nick wanted to see how high an ice cube would float in different temperatures of water. Identify the DEPENDENT variable.

Temperature the ice cube was at its highest height

Mario studied how far room temperature water would spurt out of a plastic milk carton when 3mm holes were punched at different heights from the bottom of the container. Identify the DEPENDENT variable.

Distant water traveled out of carton

Different heights of the holes in the container

A scientist hypothesizes the the temperature at which an alligator's egg is incubated will determine whether the alligator will be male or female. The dependent variable is

the gender of the baby alligators

the size of the baby alligators

Examine the data shown in the graph below. What conclusion can be reached by the data shown in the graph?

During the months of May, June , and July, the rate of photosynthesis increases and decreases greatly during the winter months.

During the winter months, photosynthesis increases and during the summer months, photosynthesis decreases.

Sabrina wants to test which brand of popcorn pops the most kernels. She picked a Giant Eagle brand, Orville Redenbacher, and PopSecret. All three bags started with the same number of kernels. She popped each for 3 minutes in the same microwave, and then counted the number of kernels left over. What is her independent variable?

Number of kernels before popping

Evaluate the following graph and determine the correct statement below ...

The dependent variable is total cost

The dependent variable is weight

The independent variable is total cost

The independent variable is cost of a package

You set out to determine which pop was liked better, Coke or Pepsi. You polled 30 students, giving each one 10 ml of each one. The temperature of both products were 57 degrees. You recorded the number of students that preferred Coke vs Pepsi. What are the controlled variables in this experiment?

The temperature and amount of pop distributed.

The number of students choosing Pepsi vs Coke.

The number of students polled and their gender.

There are no controlled variables in this experiment.

A scientist has gathered several different types of soil samples with different particle sizes. Water containing controlled amounts of pollutants was poured onto each sample. After passing through the soils, the water was collected and the amount of pollutants was analyzed. What is the scientific question?

Which type of soil will remove the most pollutants from the water?

Which type of soil absorbed the most water?

Which type of water pollutants were removed by the soil?

Which type of soil will allow water to pass through it best?

Scientific Method

Quiz

•

Science

•

8th Grade

•

Practice Problem

•

Medium

•

NGSS

MS-LS1-5, MS-LS2-1, MS-PS2-2

+12

Standards-aligned

Leslie Buzzy

Used 186+ times

FREE Resource

62 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The summary at the end of an experiment that explains the results.

conclusion

procedures

materials

responding variable

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A series of steps used by scientists to solve a problem or answer a question.

scientific method/process

recipe

data collection

metric system

In a controlled experiment, how many independent variables can be worked with at a time?

one

none

two or more

how ever many makes sense.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the INDEPENDENT variable.

distance traveled by the ball

height of the ramp

mass of the ball

weight of the ball

Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the DEPENDENT variable.

height of the ramp

distance traveled by the ball

mass of the ball

weight of the ball

6.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

A student is planning an experiment to find out how the height from which he drops a ball affects how high the ball bounces. The DEPENDENT variable is the _____.

Diameter of the ball

Force acting on the ball

Height that the ball bounces

Height from which the ball is dropped

When experimenting with the growth of a plant, a scientist uses three (of the same type of) plants, two different fertilizers, same light, and same amount of water. What type of variable is the fertilizer?

Dependent

Independent

Control

Compound

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Scientific Method

62 questions

The summary at the end of an experiment that explains the results.

A series of steps used by scientists to solve a problem or answer a question.

In a controlled experiment, how many independent variables can be worked with at a time?

Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the INDEPENDENT variable.

Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the DEPENDENT variable.

A student is planning an experiment to find out how the height from which he drops a ball affects how high the ball bounces. The DEPENDENT variable is the _____.

When experimenting with the growth of a plant, a scientist uses three (of the same type of) plants, two different fertilizers, same light, and same amount of water. What type of variable is the fertilizer?

If I study for my scientific method quiz, then I will have a better test score. What is the DEPENDENT variable?

What step does every scientific experiment begin with?

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