Introduction to solutions (chapter 5)

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Introduction to solutions (chapter 5)

  1. 1. Introduction to Solutions (Chapter 5)<br />7 SCIENCE <br />
  2. 2. How do solutions relate to matter?<br />Atoms make up all matter on earth; therefore solutions are made from atoms<br />When atoms combine they are called chemical compounds<br />Ex: What atoms make up the chemical compound water?<br />These chemical compounds cannot be separated by physical processes like squeezing, filtering etc<br />If a substance can be broken down by physical processes it is called a mixture<br />
  3. 3. Mixtures<br />A mixture is a combination of substances that can be separated by physical means <br />Ex: boiling saltwater to separate the salt from the water<br />Two types of mixtures:<br />Heterogeneous<br />Homogeneous <br />
  4. 4. Heterogeneous Mixtures<br />Hetero = different<br />The substances in a heterogeneous mixture are not mixed evenly, so different parts have different compositions<br />Different parts of the mixture are easy to see<br />Ex: watermelon and seeds<br />Ex: oil in water <br />
  5. 5. Homogeneous Mixtures<br />Homo = same <br />Made up of 2 or more substances and one appears to ‘disappear’ into the other<br />Not easy to see the different parts<br />Ex: Saltwater – you cannot see the salt as different than the water<br />Ex: Nestea powder into water cannot see the powder is different<br />Also called a solution<br />
  6. 6. Solutions <br />When you mix 2 or more substances together, the substance that seems to disappear (dissolves), is called the solute<br />The substance that dissolves the solute is called the solvent<br />Ex: Sugar and coffee<br />Which is the solute? Solvent?<br />
  7. 7. Mixtures activity<br />Instructions:You will travel to each mixture station and be responsible for creating a mixture with your group, record observations and answer questions individually<br />1) Read and follow the instructions from Ms.Young and create a hypothesis for each substance. <br />2) Test your hypothesis by creating a mixture at each station with 100mL of water and half a teaspoon of each substance.<br />3) Stir until there is no change in the mixture.<br />4) Record observations for each substance.<br />5) Please answer the following questions on the back of your observation paper:<br />Which substances dissolved into the water when you stirred?<br />For the substance(s) that dissolved, how do you know that it is still there? How could you figure this out?<br />Do you think the ability of water to dissolve many substances is useful in our lives? Explain why/why not.<br />

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