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Lights

Is vegetable oil a pure substance, homogeneous mixture, or heterogeneous mixture?

This is for my CP Chemistry homework. I would use my book but my teacher used a worksheet that it from a different text book then the one we use and so it is harder to answer the worksheet's questions. I have already looked for the answer. I'm thinking the answer is pure substance.
Lights:

I have found out vegetable oil is a homogeneous mixture.

Sequoia:

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.

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