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EHEM EXAM NO 1

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QuestionAnswer
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
Created by: eishal j
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