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There are currently 118 known elements that make up all matter. Elements are pure substances that contain only one type of atom, while compounds are made of two or more elements or other compounds. Mixtures have a variable composition because their ingredients are not uniformly distributed.
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Here are the types of mixtures for the given examples:
1. Sugar dissolved in water - Solution
2. Mixture of ethyl alcohol and water - Solution
3. Mixture of salt and sand - Heterogeneous mixture (Mechanical mixture)
4. Iron filings, mongo seeds and salt mixture - Heterogeneous mixture (Mechanical mixture)
The first two examples involve dissolving of substances and forming a homogeneous mixture at the molecular level, so they are solutions.
The last two examples involve mechanical mixing of substances without dissolving and remaining as distinguishable parts, so they are heterogeneous mixtures.2013 Flammability Requirements for Apparel and Sleepwear & Drawstrings in Chi...
2013 Flammability Requirements for Apparel and Sleepwear & Drawstrings in Chi...U.S. Consumer Product Safety Commission
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- 1. 2.1-2.2 Powerpoint By Nathan Rosenberg
- 2. Elements There currently are 118 elements A element is a substance that cannot be broken down into simpler substances A element has a 鍖xed composition because it contains only one type of atom
- 3. Pure Substances A pure substance is matter that always has the same composition.
- 4. Compounds A compound is a substance that is made from two or more simpler substances The simpler substances are either elements or other compounds Oxygen is a compound Silicon is a compound
- 5. Mixtures The properties of a mixture can vary because the composition is not 鍖xed. When ingredients are not evenly distributed.
- 6. Physical Properties Viscosity is the resistance to 鍖owing . Conductivity is a materials ability to allow heat to 鍖ow through it. Malleability is the ability of a solid to be hammered without shattering Hardness can be compared by scratching two materials and seeing which scratches which. Melting and boiling point Density can be used to test purity of a subject
- 7. Evaporation A process used to isolate a solid dissolved in a liquid Warning: You are not going to isolate all of the substances
- 8. Filtration A process that separates materials based on their sizes
- 9. Distillation A process that separates the substances in solution based on Boiling point
- 10. Flammability and Reactivity Flammability is a materials ability to burn is the presence of oxygen. The property that describes how readily a substance combines chemically with other substances is reactivity. Flammability and reactivity are both qualitative results.
- 11. Recognizing Chemical Change A change in color Production of gas Formation of a precipitate
- 12. Is a change chemical or Physical When matter undergoes a chemical change, the composition of the matter changes . When matter undergoes a physical change, the composition of the matter remains the same.
- 13. 1. What is a mixture?
- 14. 2. What is the down side to evaporation?
- 15. 3. How do you recognize chemical change?
- 16. 4. How do you perform a distillation?
- 17. 5.How do you know if a change is chemical or physical?