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Chapter 2 & 4
Stack: Sept. 24
Question | Answer |
---|---|
1.Water, vinegar, and baking soda have two elements in common. What are these elements? | The two elements are oxygen and hydrogen. |
2.How do elements combine to create compounds? | Elements create compounds using a ratio of their masses. For instance, the compound water. The ratio of hydrogen to oxygen in water is 1 to 8. That is a ratio based on their masses. |
3.How can I break down a compound? | There is only one way to change a compound: chemical change. If energy is needed for a chemical change there are two ways to get that energy: a)Heat b)Applying electric current |
4.What are three common ways to separate mixtures? | Magnetism: makes it easier to separate metals from nonmetals; to separate iron from aluminum Distillation: separates substances based upon their boiling points; separates crude oil into sections (gasoline) Centrifuge: separates by densities |
5.Do mixtures have a fixed ratio like compounds? | Mixtures do not have a definite mass ratio. |
6.What are the differences between mixtures and compounds? | Mixtures: -Made up of elements, compounds, or both -Separated by physical means -No change to original properties Compound: -Made up of elements -Separated by chemical means -Changes original properties |
7.What is the process of particles separating and spreading evenly throughout a mixture | Dissolving. The substance being dissolved is called the solute. The solvent is the substance that dissolves the solute. |
8.Let's talk solutions. What must a solution be to dissolve? | A solution must be soluble or able to dissolve in its solvent. Insoluble substances are just mixtures but not solutions because they are unable to dissolve. |
9.Can you give a memorable solution example? | Salt water is a solution. The salt within it is soluble(it can dissolve in water.) Salt becomes the solute whilst water is the solvent. |
10.Is there anything important about solutions to remember? | When two liquids/gases form a solution, the substance that is more abundant will be the solvent. |
11.What are alloys? | They are solid solutions of metals and nonmetals dissolved in metals. |
12.What are the five states of solutions? | Gas in Gas Gas in Liquid Liquid in Liquid Solid in Liquid Solid in Solid |
13.In the same order as the previous question (12), give examples of the five solution states? | GG- dry air GL- soft drinks LL- antifreeze SL- salt water SS- brass |
14.What is so interesting about solution particles? | Solution Particles are very small. They cannot settle out, be filtered out, or scatter light. |
15. What are the three ways to speed up dissolving solids in liquids? | -Heating -Mixing -Crushing |