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Activity 5: Investigating Weight Gain and Weight Loss

Activity 5: Investigating Weight Gain and Weight Loss. Conservation of Mass. (Except in nuclear reactions) the total mass of of the materials (solids, liquids, and gases) involved in any change in matter stays the same. Tracing Matter Process Tool. g. g. Gas. Gas. g. g. Liquid. Liquid.

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Activity 5: Investigating Weight Gain and Weight Loss

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  1. Activity 5: Investigating Weight Gain and Weight Loss

  2. Conservation of Mass • (Except in nuclear reactions) the total mass of of the materials (solids, liquids, and gases) involved in any change in matter stays the same.

  3. Tracing Matter Process Tool g g Gas Gas g g Liquid Liquid g g Process: Solid Solid Matter Inputs Matter Outputs

  4. Wetting a Sponge g g Gas Gas 20 g g Liquid Liquid 30 g g Process: Solid Solid Matter Inputs Matter Outputs What is your prediction of the weight ofthe wet sponge?

  5. Wetting Vermiculite g g Gas Gas 30 g g Liquid Liquid 40 g g Process: Solid Solid Matter Inputs Matter Outputs What is your prediction of the weight ofthe wet Vermiculite?

  6. Wetting a Sponge g g Gas Gas 20 g g Liquid Liquid 30 g 50 g Process: Solid Solid Matter Inputs Matter Outputs Prediction that follows Conservation of Mass

  7. Wetting Vermiculite g g Gas Gas 30 g g Liquid Liquid 40 g 70 g Process: Solid Solid Matter Inputs Matter Outputs Prediction that follows Conservation of Mass

  8. Your Predictions and Measurements • When you measured the mass of the wet sponge and Vermiculite, how accurate were your predictions? • Do you think conservation of mass applies to wetting the sponge and Vermiculite? • Did the sponge and Vermiculite gain weight when you added water?

  9. Drying a Sponge g g Gas Gas g g Liquid Liquid 50 g g Process: Solid Solid Matter Inputs Matter Outputs What is your prediction of the weight ofthe dry sponge? What happened to the mass of the water?

  10. Drying Vermiculite g g Gas Gas g g Liquid Liquid 70 g g Process: Solid Solid Matter Inputs Matter Outputs What is your prediction of the weight ofthe dry Vermiculite? What happened to the mass of the water?

  11. Drying a Sponge g 20 g Gas Gas g g Liquid Liquid 50 g 30 g Process: Solid Solid Matter Inputs Matter Outputs Prediction that follows Conservation of Mass

  12. Drying Vermiculite g 30 g Gas Gas g g Liquid Liquid 70 g 40 g Process: Solid Solid Matter Inputs Matter Outputs Prediction that follows Conservation of Mass

  13. Your Predictions and Measurements • When you measured the dry mass of the sponge and Vermiculite, how accurate were your predictions? • Do you think conservation of mass applies to drying the sponge and Vermiculite? • Did the sponge and Vermiculite lose weight when you dried them out?

  14. A Student Drinking Water g g Gas Gas 600 g g Liquid Liquid 50.0 kg g Process: Student Student Matter Inputs Matter Outputs What is your prediction of the weight ofthe student after s/he drinks the water?

  15. Watering Your Plants g g Gas Gas 10 g g Liquid Liquid 150 g g Process: Plant in cup Plant in cup Matter Inputs Matter Outputs What is your prediction of the weight ofthe cup, soil, and plants after watering?

  16. A Student Drinking Water g g Gas Gas 600 g g Liquid Liquid 50.0 kg 50.6 kg Process: Student Student Matter Inputs Matter Outputs Prediction that follows Conservation of Mass

  17. Watering Your Plants g g Gas Gas 10 g g Liquid Liquid 150 g 160 g Process: Plant in cup Plant in cup Matter Inputs Matter Outputs Prediction that follows Conservation of Mass

  18. Final Discussion Questions • Look back at the questions you answered before starting this activity. Do you now have different answers to any of the questions? • Do you think that conservation of mass applied to all the changes that you measured? Why were the masses you measured before and after sometimes different? • You can see that the measured weight of something can vary a lot depending on how much water is in the system. How could we tell whether plants are gaining dry weight (not just water) when they grow?

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