Science Quiz - Mixtures 01 (Answers)
Test your knowledge of mixtures in this KS3 Science quiz. Alloys are mixtures of metals. Alloying one metal with other metal(s) or non-metal(s) often enhances (improves) its properties. For example, steel is more malleable than iron, its primary element. There are many types of steel, one of the most common is mild steel which is an alloy of iron with a small quantity of the non-metal carbon. Another important group of alloys is the stainless steels, which resist corrosion (don't go rusty). These are mainly iron that has been alloyed with the metals chromium and nickel, together with small quantities of other metals and non metals. Many foods are emulsions. An emulsion is a mixture of an oil and water. Adding an emulsifier can make these very stable.
A property of many mixtures is that they can be easily separated into their component parts. One example that is usually done in school is to separate sulfur and iron filings. This is very simple as you can just use a magnet. A mixture of a solid dissolved into a liquid e.g. brine (salty water) can be separated using evaporation whilst mixtures of liquids with different boiling points can be separated using distillation.
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You can find more about this topic by visiting BBC Bitesize - Elements, compounds and mixtures
Water and salt are compounds, oxygen is an element
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If substances are chemically joined together they are much more difficult to separate. Alloys are mixtures that are usually hard to separate
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The air is mainly nitrogen
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Sulfur is non-magnetic
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Chromium is an element
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Any sample of a pure substance will have the same melting point as any other sample of the same substance. One sample of a mixture will often have a different melting point to other samples of the same mixture. If the two samples of a mixture have the same concentrations, then they will have very similar melting points
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Methane is a compound
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The solid that has been dissolved is called the solute
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Chroma comes from the Greek word for colour, khroma
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There is more energy at higher temperatures
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