What is the difference between volume of water in the windowsill on Day 4 and the volume of water in the closet on Day 4?
Ben observed that puddles outside seem to disappear more quickly when it is a sunny day.
He decided to test this by setting up an experiment in which he placed a graduated cylinder with 10 ml of water in a dark closet and a graduated cylinder with 10 ml of water by the window. Each day he measured the amount of water. His data is shown below.
What is a testable question this experiment would answer?
What is the independent variable?
What is one constant or controlled variable?
Kate made an electromagnet with 15 coils that picked up 4 paperclips. She wondered if using a thicker wire would make the electromagnet stronger.
Kate’s Plan:
1. Wrap a thin wire around a nail 15 times and connect to a battery. Count how many paperclips the electromagnet attracts.
2. Wrap a thick wire around a nail 15 times and connect to a battery. Count how many paperclips the electromagnet attracts.
What is a testable question this experiment would answer?
Dominique designed an experiment to test the following question:
Which liquid will corrode rust from a nail the fastest?
Dominique decided to test apple cider vinegar, hydrochloric acid, and a salt and lemon juice solution to determine which liquid breaks down rust the fastest.
Dominique’s Plan:
1. Pour 300 ml of apple cider vinegar into a glass beaker. Pour 300 ml of hydrochloric acid into a glass beaker. Pour 300 ml of a salt and lemon juice solution in a glass beaker.
2. Use 3 nails with the same amount of rust. Place 1 in each beaker.
3. Start the timer and record how long it takes for the rust to corrode on each nail.
If Dominique were to add an additional step after step 3, what should it be?
What is the independent variable in this experiment?
What are the dependent variables in this experiment?
Identify 2 safety tools that Dominique should use when conducting this experiment.
What is one thing Dominique could be more specific in Step 1 of her plan?
Identify the independent variable in this experiment.
Identify the dependent variable in this experiment.
