CH2

What do scientists primarily do?
A. Only perform experiments
B. Collect data and develop theories about nature
C. Memorize facts
D. Only work in labs

B. Collect data and develop theories about nature

Which tool is commonly used by scientists?
A. Guessing
B. Observations and measurements
C. Opinions
D. Social media
Answer: B

B. Observations and measurementsc

Why is peer review important in science?
A. It makes science faster
B. It checks the quality and accuracy of research
C. It replaces experiments
D. It proves ideas permanently

B. It checks the quality and accuracy of research

What happens when new evidence is found?
A. Nothing changes
B. Hypotheses can be revised
C. Science stops
D. Laws are deleted

B. Hypotheses can be revised

Why is science considered “credible”?
A. It is based on opinions
B. It uses evidence, testing, and peer review
C. It never changes
D. It avoids mistakes

B. It uses evidence, testing, and peer review

What is matter?
A. Anything that moves
B. Anything that has mass and takes up space
C. Only solids
D. Only liquids

B. Anything that has mass and takes up space

. What are elements made of?
A. Cells
B. Atoms
C. Molecules only
D. Energy

B. Atoms

What is a compound?
A. One atom
B. Two or more elements chemically combined
C. Only gases
D. Pure energy

B. Two or more elements chemically combined

What is kinetic energy?
A. Stored energy
B. Energy of motion
C. Chemical energy
D. Nuclear energy

B. Energy of motion

What is potential energy?
A. Energy of movement
B. Stored energy
C. Heat energy
D. Sound energy

B. Stored energy

What does the first law of thermodynamics state?
A. Energy disappears
B. Energy is created
C. Energy cannot be created or destroyed
D. Energy stops moving

C. Energy cannot be created or destroyed

What does the second law of thermodynamics explain?
A. Energy becomes more useful
B. Energy stays the same
C. Energy becomes less useful when transferred
D. Energy is destroyed

C. Energy becomes less useful when transferred