2.03 Chemical Properties of Matter Quiz 1. If a pure substance consists of hydrogen and oxygen and a mixture consists of hydrogen and oxygen: the components of the pure substance will not be able to be separated by physical means 2. The chemical properties of a compound are di ff erent from the chemical properties of a mixture because: the substances in a compound are chemically joined in a fixed proportion 3. A homogeneous mixture of nitrogen gas and oxygen gas will have the same chemical properties as a compound formed from nitrogen gas and oxygen gas: False 4. When the same type of cake is purchased from two di ff erent bakeries, the two cakes do not always taste the same. This is because cakes are mixtures: True 5. Which of the following is an example of a chemical change? baking soda and vinegar combining to form a gas and a solid 6. A stick of butter is taken from the refrigerator, sliced into pieces, placed into a frying pan, melted, and then burned as the frying pan is heated. Which of these steps involves a chemical change? burning the butter 7. Water evaporating is a chemical change: False 8. An apple slice turning brown is NOT an example of a chemical change: False 9. Which of the following types of matter does not take the shape of its container? A solid 10. Which state of matter spreads itself to fill the entire volume of its container, irrespective of the container's shape or size?A gas 11. Little force is necessary to compress a sample of liquid water into a smaller volume. False 12. Bread dough rising is a result of water vapor being released and forming air pockets in the dough as a result of a physical change. False Chemical Change Both Physical Change Decomposition Change in temperature Breaking Precipitate forms Heat produced Changes shape Change in odor Change of color Phase change Formation of gas Release/absorption of energy (heat, light, or sound)
2.04 Separation Mixtures Introduction Stranded on a deserted island, and you have one thing that you can bring with you. Salty sea water is not drinkable, the maximum survival time without drinking any water is 10 days (in the shade). This is where the next topic comes in - separating mixtures. There are many ways we can separate Mixtures based on the di ff erences in their physical properties. We will be able to figure out how to survive on a stranded island. After this section, we will be able to: • Separate mixtures base on di ff erences in physical properties. Simple Seperation Techniques Leaving a soda outside in warm weather or in a warm car will result in the original water and carbon dioxide evaporating into the atmosphere, and leaving the original sticky syrup in the bottom of the glass. Air, food, soil, blood, plasma, and saliva are mixtures, and knowing how to isolate components of mixtures is incredibly important.
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