(Term 1) 1st Summative Test in Science 7Online version
Use of Models and the Particle Model and Changes of State
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1. Which of the following best defines a scientific model in the study of science?
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2. Why is it necessary for scientists to use models when studying the structure of an atom?
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3. A student created a physical model of the solar system using foam balls. What is a common limitation of this type of model?
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4. Which of the following situations best demonstrates the use of a model to explain a scientific phenomenon?
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5. If you were tasked to evaluate a classmate's 3D model of a typhoon, which of the following criteria is the most important for scientific accuracy?
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6. Over the centuries, the model of the atom has changed multiple times—from a solid sphere to a nucleus surrounded by electron clouds. What does this indicate about scientific models?
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7. In which of the following scenarios is a scientific model LEAST likely to be useful?
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8. You are asked to create a visual model explaining the water cycle to Grade 3 students. How should you design your model to make it highly effective?
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9. According to the Particle Model of Matter, what is true about the composition of pure substances?
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10. If you have a cup of pure distilled water and a separate block of pure gold, how do their particles compare based on the Particle Model?
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11. Imagine you have a solid cube of iron. If you cut it repeatedly until you reach the smallest possible piece, what characteristic will those smallest iron particles have?
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12. A student claims that \"Air is not matter because you cannot see its particles.\" How would you analyze this statement using the Particle Model?
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13. Based on the kinetic particle theory, what generally happens to the particles of a substance when its temperature is significantly increased?
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14. Which statement best explains why gases can be easily compressed compared to liquids and solids?
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15. A student dropped food coloring into a glass of hot water and a glass of cold water. The coloring spread much faster in the hot water. What does this prove?
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16. Why does a solid block of wood retain its rigid shape even when transferred from one container to another?
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17. If an inflated balloon is left inside a hot car during a sunny day, it might pop. How does the Particle Model explain this event?
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18. Based on the described models above, which box represents a solid?
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19. Using the same image description from Question 18, how would you describe the relative motion of particles in Box Y (liquid)?
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20. If you were to draw arrows on the particles in Box Z (gas) to represent their motion, how should the arrows look compared to Box X (solid)?
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21. When comparing the spaces between particles in the three states of matter, which of the following statements is highly accurate?
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22. What happens to the particle arrangement and energy when a solid changes into a liquid, and then into a vapor (gas)?
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23. A gaseous vapor changes into a liquid and then freezes into a solid. Which of the following is true about the energy during these phase changes?
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24. How would you explain the melting of ice (solid to liquid) in terms of particle attraction?
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25. You notice water droplets forming on the outside of a cold glass of juice. How would you evaluate and explain this phenomenon using the particle model?
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