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10 Cards in this Set
- Front
- Back
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What is the definition of a pure substance? |
Something that only contains one element or compound |
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Why is boiling point a good way to test whether something is pure? |
Because a pure substance has a specific temperature |
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What is a formulation? |
A mixture with exact amount of components |
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Why is it important that formulations have the right amount of everything in them? |
To that they can correctly meet their required function |
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What are the 2 stages of chromatography? |
1. Mobile phase 2. Stationary phase |
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Equation for Rf value: |
Distance travelled by substance/ distance travelled by solvent |
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Why does the line have to be drawn in pencil in chromatography? |
If it's pen the line will move |
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How to test for: 1. Chlorine 2. Oxygen (overated) 3. Carbon dioxide 4. Hydrogen
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1. Bleaches damp litmus paper 2. Put a glowing splint inside a test tube containing oxygen it'll relight 3. Putting CO2 in an aqueous solution of calcium hydroxide (limewater) makes it go cloudy 4. Hold a lit splint at the end of a test tube it'll make a squeaky pop
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:) |
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What are the four parts of paint and their functions: |
• pigment - colour • solvent - alter viscosity and dissolve • binder - forms a film • additives - further change properties of the paint |
