Copy in your notebook Property – a characteristic of substance that can be observed. Matter – anything that has mass and takes up space. Is it matter Yes No A Car? A Box? You? Heat?

Copy the following information in your notebook right side. 3. Melting Point of water – 0°C (32°F) Temp at which a solid can change to liquid 4. Boiling Point of water – 100°C (212°F) Temp at which liquid boils 5. Water’s density is 1.0 g/ml

Properties of Matter Study Guide Answers From notes( Use your notes to define and give examples of each) List 3 physical properties and observations for each picture. Homogenous and Heterogeneous refer to your notes.

5. Why does density not depend on the amount of a substance you have 5. Why does density not depend on the amount of a substance you have? Density of a substance is the same regardless of the size of the sample. 6. D= m/v =77.6g/11.5 cm3 = 6.75g/cm3 M=DV = 1.25g/cm3(45ml)= 56.25 g V =m/d = 151g/13.5g/cm3 = 11.18cm3

7. What would happen to a balloon full of carbon dioxide in air 7. What would happen to a balloon full of carbon dioxide in air? The density of N2 is lower than air so the balloon would float. How would gasoline, cooking oil, water layer in a beaker? Why? Gasoline, cooking oil, water You have an unknown liquid with a mass of 7.15g and a volume of 11cm3. What is it? ASH WOOD

8. Describe physical changes 8. Describe physical changes. Physical Change – do not change the composition of a substance, only the physical properties (ex. Substance change from one phase to another, melting of ice cream)

9. Solute – lemonade powder Solvent – water Solution – lemonade 9 9. Solute – lemonade powder Solvent – water Solution – lemonade 9. Solubility – max amount of solute that can be dissolved in a given amount of solvent.

10. Explain how temp, surface area, and stirring affect the solubility of substance? When the temperature of a solution is increased, the average kinetic energy of the molecules and ions in solution is also increased. This means that both the solvent and dissolved solute particles are travelling from one region of the solution to another region more quickly as the temperature is raised. This increased movement increases the rate at which fresh solvent is brought into contact with the undissolved solute crystal.

Surface Area - Because dissolving occurs at the surface of a crystal, the more solute surfaces that are exposed to solvent, the faster the solute will dissolve. Increasing the surface area of the solute to be dissolved increases the rate at which it will dissolve.

Stirring helps to dissolve a solute by bringing fresh solvent in contact with the solute crystal at a faster rate. As the surface layer of a solute crystal dissolves, the solution surrounding the crystal tends to have a high concentration of dissolved solute, which tends to slow down the rate of dissolving.

11. What effect does adding a solute have to the properties of a pure solution? The freezing point is lowered. The boiling point increases/rises

12. Use the solubility graph to the right for the following questions. Which substance (X or Y) has a higher solubility at 10°C? Y Which substance (X or Y) has a higher solubility at 80°C? X What happens at about 35°C? The two variables have the same solubility. Which has a greater increase in solubility as temperature increases? X

13. Refer to your notes Metal- Fe2 Iron