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EHEM EXAM NO 1
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Question | Answer |
---|---|
chemistry | Structure. reactions. composition of matter |
Properties of Matter | Physical and Chemical Properties |
Physical changes | Observed without changing the identity if matter, descriptive |
extensive property | properties that depend on the amount of an object |
Intensive Property | Does not depend on amount (density) |
Chemical Change | Changes observed when a substance is combined with another to make a new one with different properties and one or more than one new substances are in this process |
Giveaways for Chemical Change | Temperature. color change, gas. burning, rusting, tarnish |
Chemical Changes are | Not easily reversible (Higher Level ) |
Matter | Pure substance (compound/element) or mixture |
Mixture Vs compound | compound is a set ratio with a chemical reaction, whereas mixtures have varied ratios and are physical |
types of mixtures | Homogenous and heterogenous |
Homogenous | Looks the same throughout (solutions) |
Heterogenous | Not even all the way, can see different parts (Susp. colloid) |
Metals | Good conductors, malleable/ductile, lustrous, high density |
Non-metals | Low density, gas/soft solid, no luster |
Metalloids | are that group in between, |
Significant figures | All measurements that have actually been measured and one estimated digit |
3 SF | 1. Lab 2. Rounding Formula 3. Given Measure |