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Shelly wants to know if the temperature of a tennis ball affects the height of the bounce. What is the independent variable?
the brand of tennis ball
the temperature of the tennis ball
how high the ball bounces
the surface the ball is bounced on
Controlled variables are
factors that are being measured
factors that are being changed
factors that are observed
factors that stay the same
Which variable do you measure or observe in an experiment?
Taylor is investigating if different types of shoes affect how high an athlete can jump. What is the independent variable.
how high the athletes jump
how the jumps are measured
different types of shoes worn
the surface used for the jumps
Leslie is investigating which brand of cell phone has the longest battery life. What is the dependent variable?
how the phone is used
charge of the battery before starting
the brand of cell phone
how long the battery lasts
Isacc is investigating how long it take his dog to react to different sounds. What is the independent variable?
dog reaction times
different sounds the dog is exposed to
how the dog reacts to different sounds
how long Isacc make each different sound
Melissa is investigating how different types of music affect student heart rates. What is the controlled variable?
the volume of the music
the student heart rates
the type of music played
the radio station
A student constructs several terrariums to grow plants. Each terrarium is exposed to a different amount of sunlight each day. In order to determine the ideal amount of sunlight, which of the following variables must be held constant?
amount of sunlight received
type of plan
A student hypothesizes that green algae will grow fastest when exposed to blue light. To test this hypothesis, the student should design an experiment with which independent variable?
color of light
amount of light per day
color of algae
Sandy is conducting an investigation to find out which food his dog likes best. Which is the dependent variable in his investigation?
color of the dog's dish
amount of food eaten
the type of food given
You design an experiment to test the effects of temperature on bacterial growth. You use three bacteria cultures under three heat lamps at different temperatures. What is the dependent variables int his experiment?
length of the experiment
two students wanted to find out which of their toy race cars would go the farthest down a ramp. Which of these should be held constant if they want a fair test of their cars?
height of the ramp
the weight of the ramp
the length of the ramp
In an experiment about growth, some snapdragon seeds were placed in dishes lined with moisture paper towels at different temperatures. Which of these is the independent variable in this experiment?
the number of sprouts
the type of seed
Decide if the scenario is quantitative or qualitative data: The flower is red with a yellow center.
Decide if the scenario is quantitative or qualitative data: My grade on the Science Test was a 93%.
Decide if the scenario is quantitative or qualitative data: Our Science class has 25 students.
Decide if the scenario is quantitative or qualitative data: The laptop is white with silver trim.
Decide if the scenario is quantitative or qualitative data: The candy melted in 3 minutes.
Decide if the scenario is quantitative or qualitative data: The substance feels rough.
Condensation is a phase change from a
solid to a gas
gas to a solid
gas to the liquid
liquid to a gas
Freezing is a phase change from a
gas to a liquid
liquid to a solid
solid to a liquid
liquid to a gas
Which phase of matter has NO definite shape or volume?
they all have definite shape and volume
Matter is anything that has _________ and takes up space.
What two phase changes involve skipping the liquid phase?
condensation and evaporation
sublimation and deposition
melting and freezing
sublimation and evaporation
In which phase of matter will you find the molecules tightly packed together?
none of the above
In which state of matter are the molecules loosely packed and can flow against one another?
none of the above