Grade 8 · Science · Challenge
Free Science Concepts and Evidence worksheet - version 20
Grade 8 science practice based on published U.S. learning expectations, with reproducible original variations. This printable version includes 8 grade-appropriate questions and a separate answer sheet.
Science Concepts and Evidence
Grade 8 · Stretch challenge · 8 questions · Version PG-KE4IGA-1QWR
What transfers thermal energy by direct contact?A. Formation of a new substance B. Repel C. Conduction D. They rearrange into new substances
What happens to atoms during a chemical reaction?A. Formation of a new substance B. Total mass is conserved C. Speed with direction D. They rearrange into new substances
What is a wave's frequency?A. Force, mass, and acceleration B. They rearrange into new substances C. Conduction D. The number of cycles per unit time
How is mass affected in a closed-system reaction?A. Total mass is conserved B. They rearrange into new substances C. Formation of a new substance D. Speed with direction
What is velocity?A. Conduction B. Force, mass, and acceleration C. Total mass is conserved D. Speed with direction
What does Newton's second law relate?A. Conduction B. Force, mass, and acceleration C. Formation of a new substance D. They rearrange into new substances
What do like electric charges do?A. Repel B. Conduction C. The number of cycles per unit time D. Force, mass, and acceleration
What is evidence of a chemical change?A. Formation of a new substance B. Conduction C. Force, mass, and acceleration D. Speed with direction
Answers and teaching notes
Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.
Show answers for version 20
- What transfers thermal energy by direct contact?Conduction
- What happens to atoms during a chemical reaction?They rearrange into new substances
- What is a wave's frequency?The number of cycles per unit time
- How is mass affected in a closed-system reaction?Total mass is conserved
- What is velocity?Speed with direction
- What does Newton's second law relate?Force, mass, and acceleration
- What do like electric charges do?Repel
- What is evidence of a chemical change?Formation of a new substance
Worked example
Read the direction, identify the assessed skill, solve or cite evidence, and check the response.
Common mistake
Using a memorized procedure without checking what the question asks.
Helpful hint
Name the standard skill before answering.