Find the control variable(s).
You are hired to test fertilizers. You are given 100 tomato seeds and two types of fertilizers. You plant them in the same soil in the same greenhouse. Some of the seeds get no fertilizer, some seeds get one type of fertilizer, and some seeds get the other type of fertilizer. You record data on how tall the plants grow.
-type of seed
-type of dirt
-location (in the greenhouse)
You and your cousin found a recipe for cookies with a stain over the amount of sugar you need. You think it only needs one cup, but your cousin thinks it needs to be a cup and a half. You decide you will each make a batch of cookies following the recipe exactly, except for the amounts of sugar you want to use. Your uncle volunteers to taste test them to see which one is best.
The different amounts of sugar used.
You are showing your little cousin how to jump rope and you notice that your little cousin is having difficulty using your rope instead of the one your little brother uses. Your rope is long and your brother's rope is short. Both ropes are made out of the same plastic. You give her your brother's jump rope to use, to see if that is easier for her. When she uses your rope, you can't get through the rhyme. When she uses your brothers, she can jump through the rhyme and then up to 17!
How long she can jump rope for without tripping.
You are adding minty mentos to a coke bottle with your friends. One of your friends says that you should try the fruity ones to see if it makes a difference.
Using fruity mentos instead would be _______ variable.
an independent
You can put things in the freezer on your own.
(True/False)
True
You and your cousin found a recipe for cookies with a stain over the amount of sugar you need. You think it only needs one cup, but your cousin thinks it needs to be a cup and a half. You decide you will each make a batch of cookies following the recipe exactly, except for the amounts of sugar you want to use. Your uncle volunteers to taste test them to see which one is best.
-the rest of the ingredients in the recipe
-the same instructions in the recipe (temperature, cooking time, order they are added, etc.)
-taste tester
There are lots of rose bushes in your grandma's yard. She waters them all the same amount, and gives them the same fertilizer from the Some of them have more leaves than others. You notice that some of plants are shaded by the fence, and others are in the middle of yard where there is no shade.
Some of the bushes are in the shade and some are in the sun.
You and your cousin found a recipe for cookies with a stain over the amount of sugar you need. You think it only needs one cup, but your cousin thinks it needs to be a cup and a half. You decide you will each make a batch of cookies following the recipe exactly, except for the amounts of sugar you want to use. Your uncle volunteers to taste test them to see which one is best.
How good your uncle thinks the cookies taste.
You are tired at school and your teacher says that you should go to bed earlier and see if that helps. Instead, you go to bed at the same time, but put your phone away after dinner.
Going to bed at the same time is an example of ________ variable.
a control
You can dilute chemicals at school on your own.
(True/False)
False.
Teachers and school staff should handle chemicals, especially concentrated ones.
You are showing your little cousin how to jump rope and you notice that your little cousin is having difficulty using your rope instead of the one your little brother uses. Your rope is long and your brother's rope is short. Both ropes are made out of the same plastic. You give her your brother's jump rope to use, to see if that is easier for her. When she uses your rope, you can't get through the rhyme. When she uses your brothers, she can jump through the rhyme and then up to 17!
- material for the jump ropes
- both are jumping rope
- same rhyme for jumping
You are hired to test fertilizers. You are given 100 tomato seeds and two types of fertilizers. You plant them in the same soil in the same greenhouse. Some of the seeds get no fertilizer, some seeds get one type of fertilizer, and some seeds get the other type of fertilizer. You record data on how tall the plants grow.
Whether the seeds get no fertilizer, one kind of fertilizer, or the other kind of fertilizer.
Ms. Patterson's coffee is too bitter. She adds a bit of sugar and tries it again. It is just right!
How good Ms. Patterson thinks it tastes.
You are playing basketball after school and you lace your shoes up, while your friend does not. Your feet slip around less inside your shoes than your friend.
How much your feet slide around is an example of __________ variable.
a dependent
Materials in an experiment are always safe to eat or drink.
(True/False)
False!
You may be using chemicals or materials that can hurt your body.
There are lots of rose bushes in your grandma's yard. She waters them all the same amount, and gives them the same fertilizer from the Some of them have more leaves than others. You notice that some of plants are shaded by the fence, and others are in the middle of yard where there is no shade.
- all of the bushes are rose bushes
- all the bushes get the same amount of water
-all the bushed get the same type of fertilizer
Ms. Patterson's coffee is too bitter. She adds a bit of sugar and tries it again. It is just right!
The amount of sugar in the coffee.
There are lots of rose bushes in your grandma's yard. She waters them all the same amount, and gives them the same fertilizer from the Some of them have more leaves than others. You notice that some of plants are shaded by the fence, and others are in the middle of yard where there is no shade.
How many leaves the plants have.
The time she puts the popcorn in the microwave is the _________ variable.
independent
I need to have my experiment reviewed or approved before I can begin.
(True/False)
True.
As a student, a teacher looks over your lab report and experiment. When you are older, you may have to check in with a lab tech or ethics board.
Ms. Patterson's coffee is too bitter. She adds a bit of sugar and tries it again. It is just right!
-Same cup of coffee
-Same person taste-testing
You are showing your little cousin how to jump rope and you notice that your little cousin is having difficulty using your rope instead of the one your little brother uses. Your rope is long and your brother's rope is short. Both ropes are made out of the same plastic. You give her your brother's jump rope to use, to see if that is easier for her. When she uses your rope, you can't get through the rhyme. When she uses your brothers, she can jump through the rhyme and then up to 17!
The length of the jump rope.
You are hired to test fertilizers. You are given 100 tomato seeds and two types of fertilizers. You plant them in the same soil in the same greenhouse. Some of the seeds get no fertilizer, some seeds get one type of fertilizer, and some seeds get the other type of fertilizer. You record data on how tall the plants grow.
Ms. Patterson has burned the popcorn in the microwave. She puts a new bag in and you watch to see if two minutes is too long.
Whether or not the popcorn burns in the microwave is the _________ variable.
dependent
Give me two examples of protective clothing or cleaning practices that can keep you safe
- wipe up spills immediately
- keep lab books away from hot things
- don't have open food around chemicals in the lab
-goggles
-lab coat
-long pants
-closed-toed shoes