difference between pure substance and mixture
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Answers:Here's a hint: mixtures can always be broken down into other things. 1. Sea water is a mixture because it has a ton of different things in it, like salt and water and various microorganisms. 2. Cooking oil is a mixture. It is a blend of various kinds of oils. 3. Coal is a pure substance. It is made up of nothing but carbon atoms, pure to the atomic level. 4. Steel is a mixture. It is an alloy of different other metals, especially iron. It also uses carbon. 5. Chili sauce has all sorts of ingredients. I don't know what they are exactly, but there has to be stuff like different peppers and condiment bases. It's definitely a mixture. 6. Bronze is a mixture. It's another metal alloy made with tin, copper, and some other metals. 7. Sand is a mixture. I live by the beach, and you can see variations in the grains' colors. They're not all the same, so it's a mixture of different kinds of sand. 8. Gold is an element. At 24 k, it's as pure as you need to be for practical purposes. Pure substance. 9. Orange squash: well, it's all orange squash, but squash has the stem, the skin, the flesh, and all these different parts. The components themselves range from DNA to proteins to sugars and carbohydrates and other organic molecules. Mixture. 10. Salt is pure. Just NaCl, baby. 11. Milk has fats and proteins and carbs and water and vitamins. Mixture. 10. Oxygen is just oxygen, an element. Pure substance. 12. Air is a mixture of nitrogen, oxygen, carbon dioxide, water vapor, noble gases, and hydrogen. 13. "Oranger" juice: same as milk, for the most part. Mixture. 14. Coke: caffeine, carbonic acid, sugars... mixture 15. Soil has all sorts of stuff in it. Mixture.
Answers:D looks like the best answers. A pure substance is any substance that can not be separated by a chemical or physical process (i.e. pure gold).
Answers:A pure substance is an element or compound. If it's an element, then it's made of only one kind of atom. If it's a compound, then it's made of only one kind of formula unit. For example, hydrogen (H2) and oxygen (O2) are elements. In pure samples of H2 and O2, you find only one kind of element. H2O is a compound, water. In pure samples of H2O, you find only formula units of H2O (called molecules because H2O is covalent). Neither the components that make up H and O atoms, nor the atoms that make up H2O can be separated by physical means. H2, O2, and H2O are all considered substances. A mixture is a combination of substances. Unlike a substance, mixtures CAN be separated into their component substances by physical means. If you dissolve table salt (NaCl) in a glass of water, that's an example of a mixture. The water can be separated from the salt by boiling it away, which is a physical change, not a chemical change. A homogeneous mixture is one in which the two components are evenly mixed and appear to be one phase. Saltwater is an example, because although it is made of up different substances, they appear to be one. Chicken soup is an example of a heterogeneous mixture (or a mixture in which the components are not in one phase) because you can easily distinguish the bits of chicken, noodles, and broth in the mixture. So to summarize: substances and mixtures are NOT the same, a pure substance CAN be a compound (or it can be an element), and mixtures CAN be made from different compounds. I hope that helps. Good luck!
Answers:Think of it as a pure substance is like an element, the element is always the same. Every time, Carbon is going to have the same properties. A homogeneous mixture is when two things are combined and you can not see any difference. The example i like is water and sand. When you put the sand in the water, it doesn't mix so the mixture is heterogeneous. If you mix water and sugar; however, the end product is still aqueous and appears uniform. It will be this way until you get into over saturation.