Grade 8 · Science · Challenge
Free Science Concepts and Evidence worksheet - version 9
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-128IQCZ-1QWR
What happens to atoms during a chemical reaction?A. The number of cycles per unit time B. They rearrange into new substances C. Force, mass, and acceleration D. Formation of a new substance
What does Newton's second law relate?A. Force, mass, and acceleration B. They rearrange into new substances C. Total mass is conserved D. The number of cycles per unit time
How is mass affected in a closed-system reaction?A. Total mass is conserved B. Speed with direction C. They rearrange into new substances D. Conduction
What do like electric charges do?A. Speed with direction B. Repel C. The number of cycles per unit time D. They rearrange into new substances
What transfers thermal energy by direct contact?A. The number of cycles per unit time B. Force, mass, and acceleration C. Total mass is conserved D. Conduction
What is velocity?A. The number of cycles per unit time B. Force, mass, and acceleration C. They rearrange into new substances D. Speed with direction
What is a wave's frequency?A. The number of cycles per unit time B. They rearrange into new substances C. Total mass is conserved D. Speed with direction
What is evidence of a chemical change?A. The number of cycles per unit time B. Force, mass, and acceleration C. Repel D. Formation of a new substance
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 9
- What happens to atoms during a chemical reaction?They rearrange into new substances
- What does Newton's second law relate?Force, mass, and acceleration
- How is mass affected in a closed-system reaction?Total mass is conserved
- What do like electric charges do?Repel
- What transfers thermal energy by direct contact?Conduction
- What is velocity?Speed with direction
- What is a wave's frequency?The number of cycles per unit time
- 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.