Skip to main content

Particle Models and Conservation Worksheet

📝 Worksheet medium ⏱️ 20 minutes 8 problems
Particle Models and Conservation Worksheet
Grade 7 Science LearnCrux.com
Name:
Date:
Directions
  • Fill in each blank carefully.
  • Circle or mark the best answer for each multiple-choice question.
  • Match each prompt to the best option before writing your answer.
  • Use the larger space to show your thinking on word problems.
1. Chemical reactions can be modeled as particle __.
2. Which statement is most accurate?
3. Match the idea to the best explanation: product
Match with:
Answer:
4. If the total number of atoms stays the same, total __ is conserved.
5. Why does a sealed setup help students understand conservation of mass?
6. Which evidence best supports that matter was not lost in a reaction?
7. Reactants become products when particles are __ into new combinations.
8. Why should students compare both observation and model when studying reactions?
📋 Teacher Answer Key
1. rearrangements
2. In a closed system, total mass is conserved during a reaction.
3. a new substance formed
4. mass
5. It keeps the whole reacting system together so matter cannot escape the measurement
6. the sealed system has the same total mass before and after
7. rearranged
8. Observations show what happened, and models help explain why it happened at the particle level

Need Another Connected Topic?

Review a prerequisite, move to the next skill, or open a nearby topic in the same grade for more practice.

Before This Topic

Use these earlier skills when the current lesson feels too fast or assumes knowledge students do not yet control.

Build BackgroundGrade 5
🧪Matter and Chemical Changes

Explore tiny particles of matter, compare physical and chemical changes, and use evidence to decide whether mixing creates a new substance.

Build BackgroundGrade 6
⚛️Matter and Particle Models

Use particle models to explain matter, state changes, simple atomic structure, and how substances can combine or stay as mixtures.

Build BackgroundGrade 7
🧬Heredity and Natural Selection

Explain how inherited information, variation, and environmental pressures help shape traits, survival, and population change over time.

Move to the Next Skill

These are the strongest next-step topics when students are ready to carry this idea into a harder or broader application.

Up NextGrade 7
📡Waves, Light, and Information Systems

Explain how waves carry energy and information, and how wavelength, frequency, reflection, and refraction help scientists describe light and wave behavior.