Mixtures, Compounds, and Elements: The Ultimate Student Guide
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10 cards
Question: What is a mixture?
Answer: A mixture contains two or more substances that are not chemically joined (bonded) together.
Question: Do substances in a mixture keep their own properties or change into new properties?
Answer: They keep their own properties.
Question: How can the components of a mixture usually be separated?
Answer: They can usually be easily separated using physical methods.
Question: Is making a salad (just chopping ingredients) a chemical reaction or a physical change?
Answer: A physical change, because the atoms are not rearranged.
Question: If you heat a food item in a salad (for example boiling an egg) and atoms are rearranged, is that a chemical reaction or physical change?
Answer: A chemical reaction, because the atoms have been rearranged.
Question: When iron filings and sulfur powder are simply stirred together, is that a physical or chemical change and why?
Answer: A physical change: the iron and sulfur keep their individual colours and properties and can be separated (e.g., with a magnet).
Question: What indicates a chemical reaction occurred when iron filings and sulfur are heated together?
Answer: You cannot separate the product with a magnet, the yellow colour disappears, a dark solid with different properties forms, and the atoms have bonded (
Question: Why could you separate the stirred iron and sulfur mixture with a magnet?
Answer: Because the iron remained as iron (retained its properties) and was not chemically bonded to sulfur, so the mixture components remained separate.
Question: Give an example from the content that shows the difference between physical and chemical changes.
Answer: Chopping lettuce is a physical change (no atom rearrangement); boiling an egg is a chemical change (atoms rearranged).
Question: What key words help define a mixture in the provided material?
Answer: Two, bonded, properties, separate, physical (methods), chemically.