Safety, Lab equipment, Variables and Hypotheses

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

• Dependent (measured)

• Independent (manipulated)

• Control

• Compound

Research Question: Does the type of gasoline put in a car effect how fast the car can drive. What is the independent variable?

• Type of gasoline
• which car the gas is put into
• how fast the car can drive
• how much gas is put into the car

Khaleel is testing how the use of stress balls during testing affects a student's test score. The students' average test scores who used the stress balls is the __ variable.

• dependent (measured)

• constant (same)

• independent (manipulated)

Kreedence wants to know if birds prefer to eat in one place over another. She makes three feeders out of 2-liter bottles and paints all of them red. She fills each of the feeders with the same amount of mixed birdseed, and plans to keep the feeders out for 10 days before measuring how much seed is eaten from each feeder. She puts each of the feeders in her back yard: one feeder in a large dead tree, another feeder on top of the dog house, and the last one goes in a small bushy tree.

What is the DEPENDENT variable?

• Length of the birdfeeders

• Amount of time feeders are outside

• Amount of seed eaten

• Location the feeders are put in.

Is this a good hypothesis?
Ladybugs are a good natural pesticide for treating aphid infected plants.

• Yes
• No

Tags

NGSS.MS-LS2-4

Is this a good hypothesis?
Aphid-infected plants that are exposed to ladybugs will have fewer aphids after a week than aphid-infected plants which are left untreated.

• Yes
• No

The factors in an experiment that can be changed. 

• variables
• quantitative data
• hypothesis
• steps

What is measured with a graduated cylinder?

• Passage of time
• Distance from one thing to another
• Weight of an object
• Volume of liquid

What is used to protect your eyes from chemicals, broken glass, and fire?

• Fire blanket
• Eye wash
• Goggles
• Flask

Identify this piece of equipment.

• magnifying glass
• coverslip
• slide
• microscope