Scientific Practices
What is a hypothesis?
A testable prediction or explanation
What is the basic unit of life?
Cell
What are the three states of matter?
Solid, liquid, gas
What is energy?
The ability to do work
What causes day and night?
Earth’s rotation
What do scientists use to make sure results are reliable?
Repetition and multiple trials
What organelle controls the cell?
Nucleus
What is a physical change?
A change that does not create a new substance
What is kinetic energy?
Energy of motion
What causes seasons?
Earth’s tilt and orbit
What is the difference between a control and an independent variable?
Independent variable is what is changed; control stays the same
What system moves blood through the body?
Circulatory system
What is the law of conservation of mass?
Matter cannot be created or destroyed
What force pulls objects toward Earth?
Gravity
What is the water cycle process where liquid becomes gas?
Evaporation
What type of data is numbers and measurements?
Quantitative data
What is the function of mitochondria?
Produces energy (ATP)
What is a mixture?
A combination of substances not chemically combined
What type of energy is stored in food?
Chemical energy
What layer of Earth do we live on?
Why is peer review important in science?
It checks for accuracy and validity
How do plant and animal cells differ?
Plant cells have a cell wall and chloroplasts
What is the difference between an element and a compound?
Element = one type of atom
compound = chemically bonded elements
What happens to energy in a closed system?
It is conserved (cannot be created or destroyed)
What is the difference between weather and climate?
Weather is short-term; climate is long-term patterns