Gr. 7: Solutions vs. Mechanical Mixtures

Gr. 7: Solutions vs. Mechanical Mixtures

Please watch the two videos below and then answer the questions at the bottom of the post in a google doc. Please share your doc with me j.ray@theojcs.ca and have your answers with you when we meet during Monday’s live session. I hope everyone is doing well, and there is no baby update except that our bags are packed and ready at any point!

 

Before you answer the following questions, please create a folder in your google drive called ‘Science’ to put all of your docs/resources for Science in one spot and keep you organized.

Questions – submit #1-4 to me (Challenge question is an extra and not mandatory)

  1. a) When getting a bath ready, a bath bomb and water is used. Identify which is the solute and solvent.b) Will the bath contain a solution or a mechanical mixture? Explain why?
  2. How is a solution different from a mechanical mixture? Include the terms homogeneous and heterogeneous in your answer.
  3. Which of the following is a solution, and which is a mechanical mixture? Explain your choices.

a) wood          b) tap water           c) orange juice          d) loonie coin

4. Give an example of each of the following kinds of solutions, other than those mentioned in the video.

a) a liquid in a liquid              b) a solid in a solid                c) a solid in a liquid

Challenge Question

Sea water contains perhaps the largest number of dissolved solids. Gold, for example, is found dissolved in sea water. It has been estimated that if 1 km³ of sea water is evaporated, 0.004 tonnes of gold can be recovered. What is the value of the gold in 1 km³ of sea water? (You can check online to see what the current price of gold is. Gold is often measure in troy ounces, and one troy ounce = 31.1 g)

 

 

 

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